Case Studies: Successful React.js Projects by Sodio

A look at how Sodio has used React.js across different product types, what worked, what didn't, and what decisions drove the outcomes.

What Makes a React.js Project Actually Succeed?

Most React projects don't fail because of React. They fail because of decisions made before a single component is written: state management strategy, data-fetching patterns, rendering approach, and whether the team has a clear picture of how the UI will scale over 18 months.

At Sodio, we've shipped React-based frontends across fintech dashboards, healthtech portals, on-demand platforms, and internal enterprise tools. The wins and the stumbles have taught us more than the documentation ever could. Here's an honest account of what those projects looked like.

Fintech Dashboard: When React Alone Wasn't Enough

One of the more demanding projects we've worked on was a real-time trading and portfolio analytics dashboard. The core requirement: display live price feeds, P&L calculations, and order book data simultaneously, without the UI locking up.

State Management Under Pressure

We started with Redux Toolkit for global state. It worked fine for user session and preferences, but for streaming data it created unnecessary re-renders across the tree. We switched the live data layer to Zustand, keeping Redux only for durable application state. That split reduced unnecessary re-renders measurably, and the UI stayed responsive even when ingesting WebSocket updates at sub-second intervals.

Rendering Strategy

The dashboard was not public-facing, so SEO was irrelevant. We used a pure client-side React 18 setup with useDeferredValue and useTransition to keep the UI responsive during heavy recalculations. React 18's concurrent features genuinely helped here: lower-priority updates (chart redraws) yielded to higher-priority ones (order confirmations) without manual priority queuing.

The lesson: choose your rendering model based on who sees the page and how, not as a default. Server-side rendering would have added infrastructure complexity with no user benefit in this case.

Healthtech Patient Portal: Accessibility and Performance as First-Class Requirements

A patient-facing portal has different constraints than a B2B dashboard. Users are on a wide range of devices, some have accessibility needs, and trust is harder to earn back once lost.

We built this on Next.js 14 using the App Router with React Server Components for most of the content tree. Static pages (informational content, FAQs, clinic listings) were pre-rendered at build time. Dynamic pages (appointment booking, test results) used server-side rendering with streaming to get meaningful content on screen before the full data load completed.

Accessibility Beyond Colour Contrast

We ran the project against WCAG 2.1 AA from the start, not as a post-build audit. That meant semantic HTML first, ARIA roles only where HTML semantics were genuinely insufficient, and keyboard navigation tested on every interactive component before sign-off. We used axe-core integrated into our CI pipeline so no PR could merge with a new accessibility violation.

Performance was tracked with Core Web Vitals. The Interaction to Next Paint (INP) metric, which replaced First Input Delay in 2024, was the hardest to keep under the 200ms "good" threshold on lower-end Android devices. We ended up lazy-loading several heavy form components and deferring third-party scripts aggressively.

On-Demand Logistics Platform: Micro-Frontend Architecture at Scale

A logistics platform we worked on had a structural problem: five separate teams, each owning a different product surface (driver app, dispatcher console, client portal, admin panel, reporting), all needing to share components but deploy independently.

A monorepo with a shared component library was the first instinct. It's the right call for most teams. In this case, the teams had genuinely different release cycles, different testing standards, and no appetite for coordinating a shared release. We went with a micro-frontend architecture using Module Federation (Webpack 5).

What Module Federation Actually Looks Like in Practice

Each team owns a separate React application. Shared components (design system, auth utilities) are published as federated modules. The shell application loads them at runtime, not at build time.

The honest trade-off: debugging across module boundaries is harder. Source maps don't always line up cleanly. Version mismatches between host and remote are a real operational risk if you don't pin shared dependencies carefully. We spent roughly two sprints getting the dependency pinning right and building tooling to detect version drift in CI.

The pay-off was genuine autonomy. Teams shipped independently. A bug in the reporting module didn't block a driver app release. For a team of this size and structure, the complexity was worth it. For a team of six with a single product, it would be overkill.

Architecture	Best For	Avoid When
Single React SPA	Single team, unified product	Multiple teams, independent deploy
Next.js with App Router	SEO, mixed static/dynamic content	Pure internal tooling, no public pages
Module Federation	Multiple teams, shared components, independent deploys	Small teams, tightly coupled features
React Native Web	Shared codebase across web and mobile	Performance-critical native interactions

What Do We Reach for First When Starting a React Project?

The stack we default to on a new React project in 2025 is Next.js 14+ with the App Router, TypeScript strict mode on from day one, Tailwind CSS for styling, and React Query (TanStack Query v5) for server state. Global client state goes into Zustand unless the project has a specific reason for Redux Toolkit.

Testing is Vitest for unit tests, Testing Library for component tests, and Playwright for end-to-end flows. We run Storybook for component development in isolation when the design system is non-trivial.

This isn't a universal recommendation. If you're building a highly interactive, single-page application with no public routes, Next.js adds complexity without adding value. Vite with React 18 and React Router v6 is faster to set up and easier to reason about. Pick the tool that matches the actual requirements.

Conclusion

React is a solid choice for most web UI work. The decisions that determine whether a project succeeds happen around React: rendering strategy, state architecture, team structure, and how early you make accessibility and performance non-negotiable.

If you're evaluating React for your next product, or dealing with a React codebase that's grown harder to maintain, we're happy to look at what you have and give an honest assessment. No sales pitch. Just engineering.

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FAQ

How do you decide between Next.js and a plain React SPA? If any part of the application needs SEO, shared links that render meaningful content on load, or a mix of static and dynamic pages, Next.js earns its overhead. For internal tooling, dashboards behind auth, or purely client-driven interactions, a Vite-based SPA is simpler to run and easier to debug.

Is micro-frontend architecture worth the added complexity? Only if your teams genuinely need to deploy independently and share UI components across different products. For most teams under 20 engineers working on a single product, a well-structured monorepo with a shared component library gives 90% of the benefit at a fraction of the operational cost.

How do you handle performance on low-end devices? We treat Core Web Vitals, specifically INP under 200ms, as a hard requirement from the start. That means code splitting at the route level by default, lazy-loading below-the-fold components, and avoiding third-party scripts in the critical rendering path. Testing on mid-range Android hardware, not just M-series MacBooks, catches most problems early.

What's the most common mistake in large React codebases? Putting everything in global state. React Query or SWR handle server state better than Redux ever did. Component-local state should stay local unless there's a clear reason to lift it. Teams that get this right end up with codebases that are much easier to test and refactor.

When would you tell a client not to use React? If the product is primarily content-driven with minimal interactivity, a static site generator like Astro with minimal JavaScript is a better fit. If the team is small and the timeline is short, the React ecosystem's choices can slow you down. React is a powerful default, not the only answer.

Have a project in mind? Contact Sodio Technologies to discuss your requirements and explore the right technology solution for your business.