A company that needs a software product built, such as an MVP, a customer portal, or a platform migration, usually faces a choice: <a href="https://reliasoftware.com/blog/in-house-vs-outsourcing-software-development">build it with an internal team, or hand the work to an external provider</a>. Project-based outsourcing is built for that second option when the deliverable is well defined and has a clear end date.
This guide covers what the model involves, how it's priced, when it fits better than the alternatives, and what to confirm before signing a contract.
<h2>What is Project-Based Outsourcing?</h2>
Project-based outsourcing is an engagement model where a company hands a defined software project, from requirements to delivery, to an external provider that manages its own team, process, and quality control.&nbsp;
The client sets the scope, budget, and success criteria. The provider owns how the work gets done, including who's assigned, how progress is tracked, and how quality gets checked before delivery.
A few characteristics define the project-based outsourcing model and set it apart from other&nbsp;<a href="https://reliasoftware.com/blog/outsourcing-software-development">ways of outsourcing software work</a>:
<ul>
<li>Fixed scope and deadline: The project has an agreed deliverable and a finish line, not an open-ended roadmap.</li>
<li>Provider-owned delivery: The provider manages its own team, process, and quality control; the client doesn't direct day-to-day work.</li>
<li>Single point of accountability: One provider is responsible for the outcome, not a mix of individual contractors or in-house staff.</li>
</ul>
<figure class="image align-center"><img title="What is Project-Based Outsourcing?" src="https://api.reliasoftware.com/uploads/project_based_outsourcing_4d492885fc.webp" alt="What is Project-Based Outsourcing?" width="795" height="362">
<figcaption>What is Project-Based Outsourcing?</figcaption>
</figure>
<h2>Staff Augmentation, Managed Services, and Dedicated Team Model vs Project-Based Outsourcing</h2>
<table style="border-collapse: collapse; border-color: rgb(0, 0, 0); border-style: solid; margin-left: auto; margin-right: auto; width: 96.2898%; height: 520.687px;" border="1"><colgroup><col style="width: 15.2576%;" width="86"><col style="width: 22.0591%;" width="126"><col style="width: 21.1417%;" width="128"><col style="width: 20.9545%;" width="135"><col style="width: 20.5885%;" width="179"></colgroup>
<tbody>
<tr style="height: 67.1875px;">
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 67.1875px;">
Model
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 67.1875px;">
Staff augmentation
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 67.1875px;">
Managed services
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 67.1875px;">
Dedicated team
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 67.1875px;">
Project-based outsourcing
</td>
</tr>
<tr style="height: 86.7812px;">
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 86.7812px;">
Who manages delivery
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 86.7812px;">
Client
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 86.7812px;">
Provider
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 86.7812px;">
Provider, coordinated with client
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 86.7812px;">
Provider
</td>
</tr>
<tr style="height: 106.375px;">
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 106.375px;">
Team integration
</td>
<td style="border-color: rgb(0, 0, 0); height: 106.375px;">
Joins the client's existing team
</td>
<td style="border-color: rgb(0, 0, 0); height: 106.375px;">
Provider's own team, ongoing
</td>
<td style="border-color: rgb(0, 0, 0); height: 106.375px;">
Standalone unit, ongoing
</td>
<td style="border-color: rgb(0, 0, 0); height: 106.375px;">
Provider's own team, assembled for the project
</td>
</tr>
<tr style="height: 67.1875px;">
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 67.1875px;">
Typical duration
</td>
<td style="border-color: rgb(0, 0, 0); height: 67.1875px;">
Flexible
</td>
<td style="border-color: rgb(0, 0, 0); height: 67.1875px;">
Ongoing, SLA-based
</td>
<td style="border-color: rgb(0, 0, 0); height: 67.1875px;">
Ongoing, no fixed end date
</td>
<td style="border-color: rgb(0, 0, 0); height: 67.1875px;">
Fixed, tied to project length
</td>
</tr>
<tr style="height: 86.7812px;">
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 86.7812px;">
Common billing
</td>
<td style="border-color: rgb(0, 0, 0); height: 86.7812px;">
Time and materials
</td>
<td style="border-color: rgb(0, 0, 0); height: 86.7812px;">
Retainer or SLA-based fee
</td>
<td style="border-color: rgb(0, 0, 0); height: 86.7812px;">
<a href="https://reliasoftware.com/blog/time-and-materials-contract">Time and materials</a>
</td>
<td style="border-color: rgb(0, 0, 0); height: 86.7812px;">
<a href="https://reliasoftware.com/blog/fixed-price-software-development">Fixed price</a> or milestone-based
</td>
</tr>
<tr style="height: 106.375px;">
<td style="border-color: rgb(0, 0, 0); text-align: center; height: 106.375px;">
Best fit
</td>
<td style="border-color: rgb(0, 0, 0); height: 106.375px;">
A skill or capacity gap inside an existing team
</td>
<td style="border-color: rgb(0, 0, 0); height: 106.375px;">
An entire function, not a single project
</td>
<td style="border-color: rgb(0, 0, 0); height: 106.375px;">
Long-term, ongoing product ownership
</td>
<td style="border-color: rgb(0, 0, 0); height: 106.375px;">
A well-scoped deliverable with a clear end point
</td>
</tr>
</tbody>
</table>
Vs. <a href="https://reliasoftware.com/blog/it-staff-augmentation">staff augmentation</a>: Staff augmentation fits when a company already has its own technical leadership and project management, and just needs more hands, such as adding a front-end developer for a busy sprint. Project-based outsourcing fits the opposite situation: a company that needs the entire project managed, not just staffed.
<figure class="image"><img title="Staff Augmentation vs Project-Based Outsourcing" src="https://api.reliasoftware.com/uploads/staff_augmentation_vs_project_based_outsourcing_795d8f8b9b.webp" alt="Staff Augmentation vs Project-Based Outsourcing" width="701" height="391">
<figcaption>Staff Augmentation vs Project-Based Outsourcing</figcaption>
</figure>
Vs. <a href="https://reliasoftware.com/blog/managed-it-services">managed services</a>: Managed services covers an entire function, such as ongoing application support or infrastructure monitoring, measured against service-level agreements. A company outsourcing its help desk or DevOps monitoring needs managed services since there's no single deliverable to define as "done."
Vs. <a href="https://reliasoftware.com/blog/dedicated-development-team">dedicated team</a>: A dedicated team looks similar to project-based outsourcing on the surface, since both involve a provider-managed team working on the client's behalf, but they differ in duration and scope. A dedicated team is built for a product that keeps evolving indefinitely, with no fixed deliverable to close out. A project-based engagement is built to end, once the agreed deliverable ships, and the contract is scoped around that finish line.
<figure class="image align-center"><img title="A dedicated team differs from project-based outsourcing in duration and scope." src="https://api.reliasoftware.com/uploads/dedicated_team_vs_project_based_outsourcing_11681442e4.webp" alt="A dedicated team differs from project-based outsourcing in duration and scope." width="701" height="391">
<figcaption>A dedicated team differs from project-based outsourcing in duration and scope.</figcaption>
</figure>
&gt;&gt; Read more:
<ul>
<li>Top 10 <a href="https://reliasoftware.com/blog/devops-consulting-company">DevOps Consulting Companies in Vietnam</a></li>
<li>Top 11&nbsp;<a href="https://reliasoftware.com/blog/staff-augmentation-companies-in-vietnam">Staff Augmentation Companies in Vietnam</a></li>
</ul>
<h2>How Project-Based Outsourcing Works?</h2>
A project-based engagement moves through four stages:
<table style="border-collapse: collapse; border-color: rgb(0, 0, 0); border-style: solid; margin-left: auto; margin-right: auto; width: 94.6996%;" border="1"><colgroup><col style="width: 25.4206%;" width="161"><col style="width: 26.3551%;" width="181"><col style="width: 25.6082%;" width="140"><col style="width: 22.6161%;" width="141"></colgroup>
<tbody>
<tr>
<td style="border-color: rgb(0, 0, 0); text-align: left;">
Stage
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center;">
Client's role
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center;">
Provider's role
</td>
<td style="border-color: rgb(0, 0, 0); text-align: center;">
Output
</td>
</tr>
<tr>
<td style="border-color: rgb(0, 0, 0); text-align: left;">
<ol>
<li>
Discovery
</li>
</ol>
</td>
<td style="border-color: rgb(0, 0, 0);">
Define business goals, constraints, and must-have requirements
</td>
<td style="border-color: rgb(0, 0, 0);">
Assess feasibility, estimate effort, flag technical risks
</td>
<td style="border-color: rgb(0, 0, 0);">
Scope document, timeline, and cost estimate
</td>
</tr>
<tr>
<td style="border-color: rgb(0, 0, 0); text-align: left;">
<ol start="2">
<li>
Planning
</li>
</ol>
</td>
<td style="border-color: rgb(0, 0, 0);">
Approve scope, budget, and milestones
</td>
<td style="border-color: rgb(0, 0, 0);">
Build the technical plan: architecture, tech stack, team composition
</td>
<td style="border-color: rgb(0, 0, 0);">
Signed contract and project roadmap
</td>
</tr>
<tr>
<td style="border-color: rgb(0, 0, 0); text-align: left;">
<ol start="3">
<li>
Development
</li>
</ol>
</td>
<td style="border-color: rgb(0, 0, 0);">
Review progress at agreed checkpoints, answer clarifying questions
</td>
<td style="border-color: rgb(0, 0, 0);">
Build, test, and manage the team's day-to-day work
</td>
<td style="border-color: rgb(0, 0, 0);">
Working software at each milestone
</td>
</tr>
<tr>
<td style="border-color: rgb(0, 0, 0); text-align: left;">
<ol start="4">
<li>
Release and handoff
</li>
</ol>
</td>
<td style="border-color: rgb(0, 0, 0);">
Accept the final deliverable against agreed criteria
</td>
<td style="border-color: rgb(0, 0, 0);">
Deploy, document, and transfer ownership (code, credentials, IP)
</td>
<td style="border-color: rgb(0, 0, 0);">
Delivered product and documentation
</td>
</tr>
</tbody>
</table>
In a project-based engagement, the provider runs its own internal process and reports progress against the milestones set during planning. So, a clear, specific scope document at the discovery stage matters more here than in <a href="https://reliasoftware.com/blog/engagement-models-in-software-development">any other engagement model</a>. A vague brief produces a vague estimate, and a vague estimate is where fixed-price disputes usually start.
<h2>When to Choose Project-Based Outsourcing?</h2>
Project-based outsourcing fits best when most of the following are true:
<ul>
<li>The scope is defined and stable: Requirements are documented well enough that a provider can estimate effort and cost without guessing.</li>
<li>There's a clear deadline or milestone: The project has a defined finish line, such as a product launch date or a contractual delivery date.</li>
<li>The internal team lacks capacity to manage delivery: The company doesn't have a technical lead available to run daily oversight of an outsourced team.</li>
<li>Single-point accountability matters: The company wants one provider responsible for the outcome, rather than coordinating multiple contractors or in-house staff.</li>
<li>The work doesn't need daily client-side iteration:&nbsp;Requirements won't shift week to week based on live user feedback.</li>
</ul>
<h2>Contract and <a href="https://reliasoftware.com/blog/software-development-pricing-models">Pricing Models</a> for Project-Based Outsourcing</h2>
Project-based engagements typically bill under one of three structures, and the right choice depends on how confident both sides are in the scope before work starts.
<h3>Fixed price</h3>
Fixed price sets the total project cost upfront against a locked scope. This works best for smaller, well-defined projects where requirements are unlikely to change.
The provider absorbs the risk of underestimating effort, which is part of why fixed-price quotes usually include a margin for uncertainty. A mid-scope change after signing typically requires a formal, and often costly, contract amendment.
<h3>Milestone-based</h3>
Milestone-based pricing breaks the total cost into payments tied to defined deliverables, such as design sign-off, a <a href="https://reliasoftware.com/blog/mvp-in-software-development">working MVP</a>, or final delivery. This fits larger projects where the client wants payment tied to demonstrated progress rather than a single lump sum at the end.
Milestone-based also gives both sides a natural checkpoint to catch scope drift early, before it compounds across the whole project.
<h3>Time and materials</h3>
Time and materials with a capped budget bills actual hours against an agreed rate, with an upper budget ceiling the provider commits not to exceed without client approval. This sits between the other two: it allows some flexibility if requirements shift slightly during development, without the open-ended risk of uncapped time and materials billing.
Cost itself depends mainly on the provider's region and the seniority of the team involved. A defined project's total cost is a function of scope, team composition, and rate, not the billing model chosen. The billing model just changes who carries the risk of a scope miss, not the underlying cost of the work.
<h2>Benefits of Project-Based Outsourcing</h2>
<ul>
<li>Predictable cost: Fixed-price and milestone billing let a client budget the full project cost before work starts, instead of committing to an open-ended hourly spend.</li>
<li>Lower management overhead:&nbsp;The client doesn't run daily standups or manage individual engineers directly, which matters most for companies without an in-house technical lead available to do that.</li>
<li>Access to a complete team: A project-based engagement typically includes a project manager, QA, and design alongside development, without the client hiring or coordinating each function separately.</li>
<li>Faster start: Because the deliverable and timeline are agreed upfront, a vetted provider can begin work within one to three weeks of a finalized scope, without the ramp-up time of building an internal team from scratch.</li>
</ul>
<h2>Risks and Limitations of Project-Based Outsourcing</h2>
Higher cost of mid-contract scope changes: Changing a signed fixed-price or milestone contract usually requires formal renegotiation of both price and timeline. You can consider a staff augmentation or time-and-materials engagement if you have changing requirements, since there's no locked scope to renegotiate.
Lower day-to-day visibility: The client doesn't manage the provider's engineers directly, so project status depends on the provider's own reporting cadence. Confirm the reporting schedule, whether that's weekly status calls, a shared project board, or milestone demos, as part of the contract.
IP and security terms need to be explicit:&nbsp;Before signing, confirm a signed NDA, an explicit work-for-hire or IP assignment clause. Also ask the provider directly what security certifications or practices they maintain. A provider's answer to that question, and whether they can back it up with documentation, tells you more about their actual security posture than a general assurance of "we take security seriously."
Greater weight on provider selection: Because the provider owns the full delivery process, choosing the wrong partner is harder to fix later. Replacing the provider often means restructuring the entire engagement, unlike staff augmentation, where individual team members are easier to change.
<h2>How to Choose a Project-Based Outsourcing Partner?</h2>
Notice to the following <a href="https://reliasoftware.com/blog/what-to-look-for-in-an-outsourced-software-development-company">factors when choosing an outsourced partner</a>:
Technical vetting process: Ask how the provider screens its engineers, through technical interviews, take-home tests, or peer review. You have to get a specific answer rather than a general assurance of quality.
Domain and technology experience: A provider with prior work in the client's industry and technology stack gets up to speed faster and asks more helpful questions in the discovery phase of the project than one starting cold.
Change-request process: Ask specifically how the provider handles a scope change once the contract is signed. This is the one process detail unique to a fixed-scope engagement.
Contract terms:&nbsp;Confirm IP assignment, data security commitments, and the process for resolving disputes or replacing team members mid-engagement, in writing.
Track record: Ask for a reference from a comparable past project, and check independent review platforms such as Clutch.
Communication process: Confirm how the provider runs status updates and escalation, and whether working hours overlap enough for the client's actual review needs.
<h2>Conclusion</h2>
Project-based outsourcing fits a defined deliverable with a clear end point: a scoped feature build, an MVP, or a full product launch with a fixed deadline.
A need that's expected to keep shifting or run indefinitely fits&nbsp;<a href="https://reliasoftware.com/blog/staff-augmentation-vs-dedicated-team">staff augmentation or a dedicated team</a> better, since both models flex with changing requirements more easily than a fixed-price or milestone contract built around a locked scope.
The right choice depends on how well-defined the work is today, not on which model sounds more comprehensive.
&gt;&gt;&gt; Follow and Contact <a href="https://reliasoftware.com/">Relia Software</a> for more information!

Project-based outsourcing is an engagement model where a company hands a defined software project to an external provider that manages its own team and workflow.

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Manufacturing software development is a process of building and connecting factory systems to support operations that standard software cannot fully handle.

A Practical Guide to Custom Manufacturing Software Development

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Shopify app development is the process of building a public or custom app for a single store that extends a Shopify store's functionality through Shopify's APIs.

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HR software development means designing, building, and integrating systems that manage the full employee lifecycle &nbsp;like hiring, records, payroll, performance, etc.

HR software development is the process of designing, building, and integrating systems that manage employee data and HR workflows such as hiring, onboarding, payroll, performance, learning, and workforce planning. It can range from a simple HRIS to a full HRMS or HCM platform with AI features, analytics, and multi-country integrations.

What is HR software development?

A production-ready HR software MVP usually takes 4 to 9 months to build and roll out. A typical timeline includes discovery, architecture, UX design, iterative development, QA, security testing, compliance review, and phased rollout. Larger modules such as recruitment, learning, and advanced analytics are often added after the first release.

How long does it take to develop HR software?

An HRIS stores core employee records such as identity, job history, compensation, benefits, and org structure. An HRMS adds daily HR workflows such as payroll, time tracking, self-service, and performance management. An HCM adds strategic capabilities such as workforce planning, succession, learning, and advanced analytics.

What is the difference between HRIS, HRMS, and HCM?

Custom HR software development costs between $15,000 and $100,000+ in 2026, depending on scope, modules, integrations, team location, and compliance needs. A basic HRIS may cost $15,000 to $35,000, while a fuller HRMS MVP can cost $35,000 to $100,000+. Advanced systems with AI, multi-country workflows, and complex integrations can exceed $100,000.

How much does custom HR software cost in 2026?

Useful AI features in HR software include resume parsing, candidate-to-job matching, policy-answering chatbots, performance review drafting, smart document search, and workforce analytics. These features work best when they support HR teams rather than making final decisions.

Which AI features are worth building in HR software?

HR software should avoid AI-driven culture fit scoring, fully automated hiring or termination decisions, and sentiment analysis on private employee messages. These features can create bias, legal risk, and employee trust issues. AI should assist human review, not secretly judge, monitor, or decide for people.

Which AI features should be avoided in HR software?

HR software should include human review for important employment decisions, clear explanations for AI-assisted outputs, strong audit logs, data access controls, and monitoring for bias or drift. AI used in hiring, promotion, task allocation, or performance evaluation should be treated carefully because these use cases may fall under high-risk AI rules.

How can HR software stay compliant with the EU AI Act and GDPR?

A practical HR software stack includes PostgreSQL for employee records, Node.js or Python for backend services, Next.js for web, React Native or Flutter for mobile, Redis for caching, object storage for documents, and an event-driven integration layer for payroll, identity providers, ATS, LMS, and other HR tools.

What technology stack is suitable for HR software development?

Vietnam is a strong offshore option for HR software development because it offers experienced engineering talent, competitive development costs, and strong capability in modern stacks such as React, Node.js, Python, Go, and mobile development. For complex HR platforms, many companies combine a senior product or architecture lead with a Vietnam-based development team.

Should companies outsource HR software development to Vietnam?

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Travel app development builds booking and navigation platforms that assist both travelers in managing trips and service providers in optimizing their operations.

It is based on your project requirements. Native development is better for apps that need heavy and advanced features or deeper device features. Meanwhile, cross-platform with Flutter or React Native helps apps launch faster, reducing development costs.

Should I build a native app or a cross-platform travel app?

Some APIs include flight APIs, hotel APIs, GDS systems, maps, payments, weather, currency, notifications, analytics, CRM, and customer support tools. For example, Amadeus, Sabre, Google Maps, Stripe, PayPal, Firebase, Twilio, SendGrid, GA4, Mixpanel, Zendesk, and Intercom.

What APIs are commonly used in travel app development?

Yes, but the business model must be clear. You can start with affiliate APIs, curated listings, manual supplier confirmation, content-driven trip planning, price alerts, or niche travel tools. However, if you want to build a full booking platform, direct inventory, supplier contracts, or reliable API access will become important as the product grows.

Can I build a travel app without direct travel inventory?

Yes. AI is useful in travel apps when it supports real tasks like itinerary creation, booking parsing, review summaries, place recommendations, support answers, or personalized suggestions. It should be added only when the app has clean data, clear inputs, proper testing, and fallback options.

Is AI useful in travel app development?

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Colly, Goquery, Rod, Chromedp, Ferret, Playwright-Go, and net/http + Goquery are the 7 most popular web scraping frameworks for Golang developers in 2026.

For static HTML, Colly is the fastest with built-in async support handling 40-50 pages/second. For JavaScript-rendered pages, Rod outperforms Chromedp with its decode-on-demand architecture.

Which Go web scraping framework is the fastest?

Yes. Use Rod, Chromedp, or Playwright-Go, all use the Chrome DevTools Protocol to control a real browser. Rod and Chromedp are Go-native; Playwright-Go wraps the Playwright ecosystem.

Can I scrape JavaScript-rendered pages with Go?

Yes. Colly remains actively maintained and is the most starred Go scraping library (~25K stars). It's production-ready with a stable API.

Is Colly still maintained in 2026?

Rod with the go-rod/stealth plugin is the best option to handle anti-bot detection. It patches common browser fingerprinting checks automatically. For HTTP-level evasion, combine Colly with proxy rotation and randomized headers.

Which framework handles anti-bot detection?

Absolutely. A common pattern is Colly + Goquery. Colly handles the crawling lifecycle (HTTP, rate limits, parallelism) while Goquery provides advanced DOM traversal. For sites with both static and dynamic pages, pair Colly with Rod.

Can I use multiple frameworks together?

Top 7 Golang Web Scraping Frameworks with Examples and Reviews

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Adaptive design uses several static layouts for selected screen conditions, while responsive design method uses one fluid layout for various screen sizes.

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Moving an existing React Router app to TanStack Router can feel daunting, but you don't need a full rewrite. A TanStack Router migration done step-by-step: auditing routes and loaders, mappingg definitions, moving data loading, then searching params to keep risk low and let you ship incrementally.
This guide walks through when migration makes sense, how to audit and map your current setup, how to migrate loaders and search params, and how to test and go-live. For setup and API (createRootRoute, createRoute, createRouter, loaders), see the&nbsp;<a href="https://tanstack.com/router/latest/docs" rel="noopener noreferrer">TanStack Router docs</a>.
&gt;&gt;&nbsp;You may need: <a href="https://reliasoftware.com/blog/tanstack-router-vs-react-router">TanStack Router vs React Router</a>: Which One is Better?
<h2>When Migration Makes Sense?</h2>
Migrate to TanStack Router when type-safe params and search, or integrated loaders and caching, would materially improve your app. You're already paying the cost of maintaining routes and loaders; moving to a single, typed route tree and first-class loaders can reduce bugs and simplify data flow.
Howerver, keep staying on React Router when your team is productive and you're not hitting type-safety or data-loading pain. Migration takes time; if the current setup works, defer. Use a framework (e.g. Next.js) when you need <a href="https://reliasoftware.com/blog/react-server-side-rendering-best-practices">server-side rendering</a>, file-based routing, or framework-specific features
<blockquote>
Key Takeaway: Migrate when the benefits (type safety, loader/cache DX) outweigh the cost. When in doubt, try one feature area (e.g. one section of routes) first.
</blockquote>
<h2>5 Steps to Migrate React Router app to TanStack Router</h2>
<h3>Step 1: Audit Your Current Routes and Loaders</h3>
Before changing code, list what you have. In a React Router app, routes are usually defined as a component tree (e.g. <code>createBrowserRouter</code> with <code>Route</code> elements). For each route, note:
<ul>
<li>Path (including dynamic segments, e.g. <code>/users/:userId</code>).</li>
<li>Loader: what it fetches and what it returns.</li>
<li>Dependencies: parent loaders, search params, or redirects.</li>
</ul>
Write a short table or doc: route path, component, loader signature, and any search params the route reads or sets. That becomes your migration map. Identify the root route and the nesting structure so you can mirror it in TanStack Router.
<blockquote>
Best Practice: Audit the routes you'll migrate first (e.g. one product area). Leave the rest on React Router until that slice is done, or plan a phased cutover.
</blockquote>
<h3>Step 2: Map Route Definitions: Component Tree vs Code/File-Based</h3>
React Router uses a component tree: you nest <code>&lt;Route&gt;</code> elements and pass <code>path</code>, <code>element</code>, and <code>loader</code>. TanStack Router uses code-based route definitions (or file-based with <code>@tanstack/router-vite-plugin</code>): you call <code>createRootRoute</code>, <code>createRoute</code>, and build a route tree with <code>addChildren</code>.
Map each React Router route to a TanStack route:
<ul>
<li>Root &rarr; <code>createRootRoute()</code>.</li>
<li>Each child route &rarr; <code>createRoute({ getParentRoute: () =&gt; parent, path: '&hellip;' })</code>.</li>
<li>Dynamic segments: in React Router you use <code>:id</code>; in TanStack Router you use <code>$id</code> (e.g. <code>/users/$userId</code>).</li>
</ul>
Example: from a React Router tree with <code>/</code>, <code>/users</code>, and <code>/users/:userId</code>, you get:
<pre class="language-typescript"><code>import { createRootRoute, createRoute, createRouter } from '@tanstack/react-router';

const rootRoute = createRootRoute();

const indexRoute = createRoute({
 getParentRoute: () =&gt; rootRoute,
 path: '/',
});

const usersRoute = createRoute({
 getParentRoute: () =&gt; rootRoute,
 path: '/users',
});

const userRoute = createRoute({
 getParentRoute: () =&gt; usersRoute,
 path: '$userId',
});

const routeTree = rootRoute
 .addChildren([indexRoute, usersRoute.addChildren([userRoute])]);

export const router = createRouter({ routeTree });
</code></pre>
The structure mirrors your current nesting; only the API shape changes. Use the same path strings so URLs stay identical. When migrating, lazy-load route components and <a href="https://reliasoftware.com/blog/react-suspense">add a Suspense boundary</a> at the route level so heavy screens don't block the initial bundle.
Optionally align route files with a feature-based layout (e.g.&nbsp;<code>routes/</code> with feature entry points) so the migrated app matches modern frontend structure.
<h3>Step 3: Migrate Loaders and Data Dependencies</h3>
In React Router, loaders are functions that receive <code>{ params, request }</code> and return data. In TanStack Router, loaders are attached to the route and receive a context that includes <code>params</code> (and search when you add validation). Move each loader body over and adapt the argument shape.
React Router example:
<pre class="language-typescript"><code>// React Router: loader on route
export async function loader({ params }: { params: { userId: string } }) {
 const res = await fetch(`/api/users/${params.userId}`);
 if (!res.ok) throw new Error('Failed to load user');
 return res.json();
}
</code></pre>
Move that logic into the route's <code>loader</code> in TanStack Router. The fetch and error handling stay the same; only the registration and param typing change.
TanStack Router equivalent:
<pre class="language-typescript"><code>const userRoute = createRoute({
 getParentRoute: () =&gt; usersRoute,
 path: '$userId',
 loader: async ({ params }) =&gt; {
 const res = await fetch(`/api/users/${params.userId}`);
 if (!res.ok) throw new Error('Failed to load user');
 return res.json() as Promise&lt;{ id: string; name: string }&gt;;
 },
});
</code></pre>
Keep the same fetch logic and error handling; only the way the loader is registered and how params are typed changes. During migration, ensure loaders that need multiple fetches use parallel requests (e.g. <code>Promise.all</code>) instead of sequential awaits to avoid waterfalls; see the TanStack Router guide for loader patterns.
In the route component, use the router's loader data (e.g. from route context or <code>useLoaderData</code>) instead of React Router's hook. Parent/child loader dependencies map to TanStack's parent route loaders. Child routes then read parent loader data from route context.
<h3>Step 4: Search Params and Validation</h3>
React Router exposes raw search params (e.g. <code>useSearchParams()</code>); you parse and validate in components. TanStack Router lets you define a search schema on the route with <code>validateSearch</code>. Centralize parsing and validation there so components get a typed object.
Example: a users list with <code>page</code> and <code>sort</code>:
<pre class="language-typescript"><code>const usersListRoute = createRoute({
 getParentRoute: () =&gt; rootRoute,
 path: '/users',
 validateSearch: (search: Record&lt;string, unknown&gt;) =&gt; {
 const page = Number(search.page);
 const sort = String(search.sort || 'name');
 return {
 page: Number.isFinite(page) &amp;&amp; page &gt;= 1 ? page : 1,
 sort: ['name', 'created'].includes(sort) ? sort : 'name',
 };
 },
});
</code></pre>
Then in components, read and set search via the router's typed APIs so you never pass invalid values. Migrate one route at a time: add <code>validateSearch</code>, then switch the component to use the router's search API instead of <code>useSearchParams</code>.
<blockquote>
Pro Tip: <a href="https://reliasoftware.com/blog/zod-schema-validation-react-tutorial">Use Zod library</a> (or another schema lib) inside <code>validateSearch</code> for complex shapes and clear error handling. TanStack Router works with any function that returns the validated shape or throws.
</blockquote>
<h3>Step 5: Test and Go-Live</h3>
After mapping routes, loaders, and search params, test the migrated slice end-to-end. Click through every link and form that affects the URL or loader data. Check that:
<ul>
<li>URLs match the old app (same paths and query strings).</li>
<li>Loader data loads and displays correctly.</li>
<li>Search params are read and written with the validated shape.</li>
<li>Error and loading states still work (TanStack Router supports error boundaries and pending state).</li>
</ul>
Run your existing tests; update any that depend on React Router (e.g. wrapper or mock router). Then deploy behind a feature flag or migrate one section at a time so you can roll back if needed. Once the TanStack Router migration is stable, remove React Router and the old route tree.
<h2>Conclusion</h2>
A TanStack Router migration from React Router is manageable when you break it into steps: decide when it's worth it, audit routes and loaders, map route definitions to TanStack's API, migrate loaders and search params, then test and go-live.
You don't need a full rewrite; you can move one area of the app first and keep the rest on React Router until you're ready. Hope this guide will help you!
&gt;&gt;&gt; Follow and Contact&nbsp;<a href="https://reliasoftware.com/">Relia Software</a> for more information!

Migrating from React Router to TanStack Router done by: 1: Auditing routes and loaders; 2: Mapping definitions; 3: Moving data loading: 4: Searching params.

A Full Guide to Migrate from React Router to TanStack Router

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