React & Next.JS Development
React and Next.js front-ends built to scale, perform, and ship fast.
Component-based architecture, design systems, and enterprise-grade performance — so your teams can launch new experiences without rebuilding from scratch every time.
Who We Build For
React projects come in many shapes. Here's where we do our best work.
Engineering leaders
| Digital & marketing leaders
| Agencies & partners
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Case Study
Sandoz / Novartis
Pharma & Healthcare
Biosimilar Platform — React + Contentful Design System
The challenge A global pharmaceutical company needed to power multiple sub-brands and microsites from a single front-end codebase — without rebuilding components for every new market launch. The constraint Enterprise compliance requirements, multiple content teams across regions, and Lighthouse performance thresholds that had to be maintained at scale. | What we built
Results |
→ Read the full case study or Talk to us about a design system project like this
Case study — Biodesix
Biodesix Pharma / SaaS | Challenge: HubSpot platform had outgrown its original structure. Marketing team couldn't launch campaigns without developer intervention. What we built: Scalable Max Mega Menu, 5 custom drag-and-drop page templates within HubSpot's Custom Theme framework — all enabling non-technical publishing. Result: Zero downtime. Zero regressions. Marketing team ships campaigns independently. |
What we build
| Design Systems & Component Libraries Atomic Design architecture, Storybook documentation, component libraries that scale across microsites, products, and sub-brands. Your team ships new pages without writing new components. | Next.js Applications (SSR, SSG, ISR) Server-side rendering, static generation, and incremental static regeneration — for SEO-optimized marketing sites, dynamic platforms, and enterprise applications. |
| Headless & Decoupled Front-ends React / Next.js as the front-end layer for Drupal, Contentful, Sanity, or any headless CMS. Fully decoupled architecture: content teams own the CMS, engineering owns the component layer. | Front-end Modernization Migration from legacy front-ends (jQuery, Angular, older React) to modern component-based architecture. Performance audits, Core Web Vitals improvements, Lighthouse optimization. |
| Performance Optimization Performance budgets, Core Web Vitals audits, Lighthouse scoring, image optimization, code splitting, and lazy loading — for teams where speed directly impacts revenue. | Staff Augmentation — React Specialists Senior React / Next.js developers who integrate into your team and sprints. Same time zone as US and Canada. Vetted for seniority, communication, and technical depth. |
How we work
Our Process
From architecture conversation to production-ready components.
01 | Discovery & architecture (Week 1) We review your current stack, understand your content model, and define the component architecture. No assumptions — we document decisions before writing code. |
02 | Design system & component definition (Weeks 1–2) Atomic Design foundation: tokens, base components, compound components, page templates. Storybook set up from day one so your team can review components in isolation. |
03 | Implementation & CMS integration (Weeks 3–N) Components built, tested, and connected to your CMS or API layer. Weekly demos, continuous integration, and PRs reviewed against your coding standards. |
04 | Performance hardening & rollout Lighthouse audit, Core Web Vitals validation, accessibility review (WCAG 2.2), and staged deployment. We don't ship until the metrics match the targets. |
| → Schedule a React architecture consultation | |
Why ParallelDevs for React
| Drupal expertise makes us better at React. Most React agencies don't understand content architecture. We've built 200+ Drupal platforms — we know how a headless CMS needs to be structured for a component-based front-end to work well. That's why our decoupled builds are faster to implement and easier to maintain. | |
| We build for the teams who inherit the code. Atomic Design and Storybook documentation aren't nice-to-haves for us — they're how we build. Every component we ship comes with usage guidelines so your internal team or next agency can work with it without calling us. | |
| Performance is a requirement, not a retrospective fix. Lighthouse targets are set in week one and tracked through every sprint. We've maintained scores above 90 across multi-brand, multi-market deployments. Not because we optimized at the end — because we built that way from the start. | |
| Same time zone. Real collaboration. Costa Rica: 0–3 hours from US East and West Coast. Our React teams work in your sprint cycles, attend your standups, and are reachable on Slack during your business hours. No async delays, no timezone-driven miscommunications. |
FAQ
Yes. We start with a codebase audit to understand architecture decisions, technical debt, and patterns already in place. We don't impose a rewrite — we extend what works and improve what doesn't.
Yes. We've migrated from jQuery, AngularJS, and older React versions to modern component-based architecture. We do it incrementally — no big-bang rewrites that freeze feature development.
We integrate into your existing workflows: your design system in Figma, your repo on GitHub, your project management in Jira or Linear. We attend your standups, submit PRs to your standards, and document everything in Storybook.
Vercel, AWS (Amplify, CloudFront, S3), Netlify, and custom CI/CD pipelines (GitHub Actions, CircleCI). We configure deployments to match your infrastructure — we don't require a specific platform.
Yes — this is one of our core services. We start from your brand guidelines and existing UI patterns, define design tokens, build base components, and document everything in Storybook. Teams typically see the ROI within 2–3 sprint cycles.
They're complementary. Many of our clients use Drupal as the headless backend and React / Next.js as the front-end layer. We can build the full decoupled stack, or step in only for the front-end if the Drupal side is already in place.
READY TO BUILD SOMETHING THAT SCALES?
Let's talk about your React architecture.
Whether you're starting a new project, modernizing a legacy front-end, or building a design system — we can scope it in a single conversation. No commitment required.
→ Schedule a React architecture consultation |