React agency for high-performance frontends & clear architecture
We modernize React codebases for better performance, DX, and more stable releases.
For teams that want to evolve React frontends
into setups that are faster, more stable, and easier to scale.
Trusted by clients across the DACH region
Scaled React setups in SaaS, insurance, media & events
Free React website audit (lite)
We review three key pages of your site/app and deliver a multi-page PDF with quick wins across performance, SEO & rendering/hydration — plus a 30-min review call.
Value: €1,200 — currently free via the form
Benefits:
- Report within 2 business days, incl. impact/effort prioritization
- Current state, risks, actions per page/view
- Low risk, no sales pressure
Note: The free audit is available via form only (not included with direct booking).
Terms: B2B in DACH, 1× per company, analysis of public pages only.
What you gain with us
When prokodo is the right React agency for your project
As a React agency, we mainly support teams when frontend architecture, state management, performance, and predictable evolution are critical to project success. If your initiative goes beyond React and also includes platforms, integrations, or custom software, you can learn more on our Software Agency page.
When the codebase becomes too complex
Growing component structures, unclear responsibilities, and logic that is hard to follow often slow teams down more than individual bugs. We help restructure React codebases, reduce risk, and create a more reliable foundation for future features.
When state and data flows become unclear
As soon as server state, client state, form logic, caching, and side effects are no longer clearly separated, complexity and error risk increase. We structure state management and data flows so React applications become more robust, easier to understand, and easier to evolve.
When performance suffers in measurable ways
Slow interfaces, unnecessary re-renders, and poor INP/LCP values directly affect user experience and conversion. We analyze render costs, interactions, and technical bottlenecks so React applications become noticeably faster and more stable again. If your modernization also includes migration, headless CMS, or a new web platform with React and SSR, you can find more information on our Next.js agency page.
When UI and components no longer fit together
Without a clean component library, a clear design-system logic, and consistent patterns, friction and inconsistency increase. We help build structured React frontends with reusable components, clear rules, and better scalability for product teams.
When legacy frontends need modernization
Many React projects do not start from scratch, but with grown frontends shaped by older frameworks, workarounds, or inconsistent architecture. We support modernization initiatives in a way that creates new structure without unnecessarily putting delivery at risk.
When your team needs to ship faster
What is often missing is not just technical quality, but a setup that genuinely helps teams move faster. We improve architecture, DX, testability, and delivery so releases become more stable, firefighting decreases, and new features can go live with greater confidence.
React in practice: projects from our day-to-day work
With React, we do not just talk about component architecture, performance, and scalable frontends. We apply these principles in real client projects. Here are two selected examples where we used React to make user interfaces more robust, more accessible, and easier to evolve over time.
Services for your React success
We modernize codebases without big-bang rewrites: Blueprint → Hardening → Feature delivery. Focused on architecture, performance & DX.
Architecture & refactoring in React
Component boundaries, render strategy, Suspense/Concurrency path in React 19, code smells & anti-patterns — with roadmap.
State management in React
Server vs. client state, caching, mutations, forms; Query/RTK/Zustand — fewer re-renders, fewer bugs.
Design system & accessibility
Tokens, Storybook, theming, WCAG — consistent UI, faster shipping.
React performance & INP
Transitions/Actions (React 19), profiling, virtualization, memoization, image pipeline — measurable INP/LCP improvements.
DX & quality assurance
Turborepo, CI pipelines, end-to-end tests with Cypress — stable releases without overhead.
React in DACH – remote-first, predictable & on-site when it matters
We deliver React projects remote-first — for speed, quality, and clear workflows. For active projects, we join on-site at clearly defined milestones such as product workshops, architecture reviews, or go-live sign-off. We bundle on-site days so your budget goes into outcomes rather than travel.
Experience with teams in Berlin, Munich, Hamburg, Zurich, and Vienna — on-site workshops and reviews as needed, while implementation intentionally stays remote-first.
Why teams hire us:
- Fast start: codebase scan in 2–5 days, kick-off possible within 1–2 weeks
- Measurable performance: target state INP P75 < 200 ms, stable frontends, and fewer re-render costs
- **Clean architecture: **component boundaries, state strategy, and data layer with a clear roadmap
- Stable delivery: CI/CD, testing, and releases with less risk and less firefighting
- Full transparency & control: bi-weekly demos, clear priorities, and one dedicated point of contact
What clients say — real impact in the team
You recognize a good React agency by steadier releases and a calmer roadmap. Clients report clear decisions, less firefighting and more deliverable features.
The project was delivered on time with a strong focus on accessibility and WCAG compliance. Clear communication, smooth collaboration, and deep technical expertise ensured a high-quality result from start to finish.
Stine Bækos - Bertelsmann Gruppe
Product Owner
How we work — no big bang, clear outcomes
- 1
Discovery & codebase scan
Profiling, bundle/render costs, state map, DX bottlenecks; 5 quick wins for the next 2–4 weeks.
- 2
Blueprint
Component boundaries, state strategy, data layer, testing plan; 30/60/90-day roadmap incl. effort & DoD.
- 3
Hardening sprint
Core refactoring, performance levers (INP/LCP), test harness, CI; visible metric improvements.
- 4
Enablement & delivery
Pairing, runbooks, Storybook care; features with lower risk and consistent speed.
Who’s behind the work
Christian Salat
Founder of prokodo
I’m Christian, founder of prokodo. For 15 years I’ve helped teams build scalable React apps — with a focus on architecture, performance and developer experience.
Frequently asked questions to a React agency
Answers on architecture, state strategies, performance, SEO and team enablement. Project specifics are best discussed in a 30-minute tech check — incl. first recommendations.
How much does a React project cost?
Depends on starting point and goals. Common entry: code/performance audit (fixed price), then two-week sprints or retainer. Ballparks (non-binding): Audit €1.2–3.5k, refactoring sprint €8–15k, MVP 6–10 weeks. We plan with a 30/60/90-day roadmap, clear DoD and measurable KPIs (e.g., INP/LCP targets, defect rate, lead time).
What does the process look like — from kick-off to go-live?
- Discovery & codebase scan (profiling, bundle/render costs, DX bottlenecks)
- Blueprint (component boundaries, state strategy, data layer, test plan)
- Hardening sprint (top levers: INP/LCP, architecture fixes, CI)
- Feature delivery (canary rollouts, observability, A/B tests)
First improvements typically go live in 2–4 weeks; an MVP in 6–10 weeks.
Is upgrading to React 19 worth it?
Often yes. React 19 brings Actions, useActionState, useOptimistic, the use API (suspends during render), new form APIs in react-dom (useFormStatus), ref as a prop, <Context> as provider, improved hydration error diffs and stable RSC. Approach: check compatibility, enable Transitions/Actions step-by-step, guard with INP/LCP watchers, rollout via feature flags
SSR/SSG or is CSR enough?
We decide per page type/flow:
- CSR for internal/app-only UIs (no SEO need, heavy interaction)
- SSR/streaming for SEO-relevant, personalized or frequently updated content
- SSG/ISR for landing/docs/category with controlled freshness
We build a rendering matrix (SEO, freshness, personalization, cost) and set cache/revalidation rules.
What’s the right state management (React Query, RTK, Zustand …)?
Server state ≠ client state.
- Server state: React Query (cache, revalidate, mutations)
- Client state: Zustand/RTK depending on complexity; forms separate (controller/schema)
Guardrails: minimal re-renders, selector-based access, decoupled side-effects, clear cross-cutting concerns (auth/feature flags/tracking).
How do you improve INP/LCP in practice?
- LCP: correct sizes for hero image, AVIF/WebP, single priority, preconnect/preload, critical CSS
- INP: event decoupling (transitions), selective/lazy hydration, virtualization, debounce/throttle, split heavy listeners
- JS budget: code-splitting, no heavy UI libs above the fold, strict third-party budget
Measurement: profiling + RUM (targets: INP P75 < 200 ms, LCP < 2.5 s).
Does SEO work with React?
Yes — with the right rendering strategy. Essentials: meaningful routes, meta/schema server-side or pre-rendered, internal linking, i18n/hreflang, fast CWV. For content teams we integrate headless CMS (previews, roles/permissions) and clean content modeling.
You can find more technical details in our React consulting solution.
How do you measure success — beyond CWV?
A KPI set per goal:
- Productivity/DX: lead time, deployment frequency, change failure rate
- Quality: defect rate, e2e pass rate, error budget
- Business: conversion/CTR, time-to-publish, SEO visibility
We report monthly, prioritize by impact/effort, and tie tasks to metric goals (e.g., INP −30 %, lead time −20 %).
