Hydration cost on slow devices
SSR pages bloat bundles and stall TTI on mid-tier Android. We split routes, lazy-hydrate islands and pre-warm critical paths.
GDPR WCAG 2.2 Core Web Vitals AI-native
React Development Services for US and EU Product Teams
YuSMP Group has shipped React applications into production for thirty-plus US and EU clients — from PropTech marketplaces (ANT) to B2B commerce portals (REHAU) and regulated medical workstations (ArgoView). Eighty senior engineers, Next.js-fluent, accessibility-trained, and graded against Core Web Vitals in every sprint review.
We deliver React engineering for four buyer profiles: SaaS product teams building dashboards and admin portals; marketplace operators managing multi-tenant product catalogs with faceted search; B2B teams connecting React front-ends to SAP, Dynamics or ERP backends; and regulated industries — healthtech, fintech, legaltech — where accessibility compliance and audit-grade UI state are non-negotiable. Core Web Vitals and WCAG 2.2 AA sit underneath every engagement from sprint one.
Challenges
Industry challenges we solve
Re-render storms
useState soup forces full subtree repaints. We move to selectors, memo boundaries and signals where it ships measurable wins.
Accessibility debt
Auto-generated components fail WCAG 2.2 contrast and focus rules. We wire Radix/Headless UI primitives and ship axe-clean.
SEO on JS-rendered pages
Googlebot reads SSR/SSG but AI Overview crawlers do not. We deliver isomorphic markup with JSON-LD schema and validate in staging.
Design-system drift
Token forks across teams destroy visual consistency. We install Storybook with design tokens and visual regression gates.
Form complexity in regulated products
Multi-step wizards with server-side validation across regulated flows. We deliver react-hook-form with Zod and audit-friendly state machines.
Solutions
Solutions we build
SaaS dashboards
Multi-tenant admin UIs with RBAC, audit trails and RUM metrics baked in from the first sprint.
B2B portals
Partner workspaces wrapping ERP and SAP, with SSO, per-tenant theming and role-gated data access.
Marketplaces & catalogs
Faceted search, JSON-LD product schema, edge-cached filters and real-time inventory feeds.
Headless storefronts
Shopify Plus and Magento PWA front-ends with cart sync, Stripe and localised checkout.
Clinical and regulated workstations
Operator-facing React UIs for clinics, lenders and dispatchers with audit-trail state and WCAG compliance.
Embedded widgets
SDK-style React bundles for partner sites, packaged with strict CSP and shadow DOM isolation.
Stack
Technology stack
TypeScript, Next.js, React Server Components, Tailwind CSS, Radix UI, react-hook-form, Zod, TanStack Query, Playwright, Storybook, Vite, Vercel, Cloudflare.
Compliance
Compliance & regulations
GDPR-aligned · WCAG 2.2 AA · SOC 2-capable · HIPAA-capable · CCPA-acknowledged
EU
- GDPR — lawful basis, consent UI, DSR automation.
- EAA 2025 — accessibility for public-facing products.
- eIDAS — identity and auth flows where required.
- CRA — secure SDLC, SBOM, vulnerability disclosure.
US
- WCAG 2.2 AA / ADA Title III — full accessibility compliance.
- Section 508 — federal and government-adjacent clients.
- CCPA/CPRA — consent banner and opt-out UI.
- COPPA — age-gating and parental consent flows where applicable.
Shared: Core Web Vitals as CI deploy gates, OWASP ASVS L2, CSP/SRI hardening, SBOM per build.
Cases
Selected React case studies
PropTech · Marketplace
ANT
Property marketplace web platform with listing CMS, search and B2B admin console for US and EU operators.
Manufacturing · E-commerce
REHAU
B2B e-commerce and product configurator for a global polymer manufacturer with multi-region pricing, stock and dealer workflows.
HealthTech · Endoscopy
ArgoView
Tablet-first endoscopy recording, patient records, and DICOM/HL7 export — built on Laravel + React with browser-tier WebRTC capture for US & EU clinics.
Why YuSMP
Why React teams choose YuSMP
Accessibility by default
Every PR runs axe-core automated checks and manual screen-reader validation. WCAG 2.2 AA is a delivery requirement, not an optional add-on.
Performance budgets per route
LCP, INP and CLS gates in CI block regressions before they reach production. We monitor with Lighthouse CI and RUM.
Design-system literate
Radix UI, shadcn/ui, Tailwind, and design token pipelines — we extend your system without breaking it.
FAQ
React FAQ
Do you use Next.js App Router with React?
Yes. Next.js App Router with React Server Components is our default for new production projects. We choose between RSC and client components deliberately, document the boundary as an ADR, and gate LCP/INP in CI.
Can you fix our existing React codebase?
Yes. We audit bundle size, re-render patterns, hydration issues and accessibility coverage, then deliver a prioritised remediation plan. Most codebases ship measurable Core Web Vitals improvements within the first sprint.
How do you ensure accessibility in React apps?
Every pull request runs axe-core automated checks and we validate focus management, keyboard navigation and screen-reader announcements manually. Our baseline is WCAG 2.2 AA.
How do you handle SEO on React apps?
We deliver isomorphic markup via Next.js SSR or SSG, implement JSON-LD schema, and validate Googlebot crawlability in staging. AI Overview crawlers are handled through server-side rendering.
Can React integrate with our .NET or Laravel backend?
Yes. We wire React front-ends to any REST or GraphQL backend via generated TypeScript clients, handle auth (OAuth2, JWT, session), and document the contract in OpenAPI.
What performance budgets do you set?
We set per-route LCP ≤ 2.5 s, INP ≤ 200 ms, CLS ≤ 0.1 as CI gates. Bundle size regressions block merge. We use Lighthouse CI and RUM (Vercel Analytics or custom OpenTelemetry) in production.
Hire senior React engineers tuned to Core Web Vitals and WCAG 2.2
Response within 1 business day. NDA on request.