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JavaScript

Work with JavaScript experts

We build JavaScript applications across the whole stack, responsive frontends and capable backends alike, engineered for performance, accessibility, and the kind of maintainability that still holds a year on.

1–2wks
to project kickoff
2–4wks
to first working software
100%
code & IP ownership
6–10yrs
average engineering experience

This is for teams building a product interface in JavaScript, from a new web app to a design system or a frontend that has to stay fast and accessible as it grows.

Custom JavaScript Development Services

We build JavaScript interfaces that stay fast and accessible as they grow. The focus is on component architecture that holds up, state that stays predictable, and performance you can actually measure, frontends that feel effortless to users and remain easy for your team to keep building on.

Enterprise applications live or die on availability, steady performance, and releases that don't collide across teams. We build to that standard, working directly with your backend and security people on API contracts, accessibility, and deployment timing, so what ships is production-grade, integrates cleanly with your infrastructure, and goes out reliably.

How we help

We agree API contracts, accessibility, and release schedules with your teams first, then ship in reviewable increments that integrate cleanly.

Enterprise systems need APIs that stay reliable at high throughput and hold to strict SLAs. We build Node.js APIs and gateways with versioned contracts, automated integration tests, and real observability, plus rate limiting, caching, and error handling that protect uptime under load, stable endpoints backed by the monitoring you need to actually hit your targets.

How we help

We version contracts, add integration tests and observability, and design rate limiting and caching so endpoints hold steady under load.

A monolith puts a ceiling on how fast you deploy and how independently teams can work. We design Node.js microservices to lift it, drawing clean service boundaries, settling how services talk to each other, and building in resilience with independent deployment pipelines, distributed tracing, and event-driven workflows behind them. The result is services that deploy on their own and scale efficiently.

How we help

We define service boundaries and communication patterns, then set up independent pipelines and distributed tracing so services ship and scale independently.

We move legacy frontends onto modern frameworks without putting your roadmap on hold. Feature flags, compatibility layers, and thorough parity tests keep the risk contained through a phased migration, so you land on a current, supportable stack built on proven JavaScript frameworks without ever putting revenue at risk.

How we help

We phase migration behind feature flags with compatibility layers and parity tests so you reach a current stack without derailing the roadmap.

We build the real-time features behind chat, collaboration, and live data streaming, the interactive parts users notice most. To keep them from breaking under load, we engineer resilient session lifecycles, reconnection logic, and backpressure, so the experience stays responsive and dynamic without operational surprises.

How we help

We engineer resilient session lifecycles, reconnection logic, and backpressure so real-time features stay responsive under load.

In interaction-heavy apps, full-page reloads break the user's flow and drag on productivity. We build single-page applications on modern JavaScript frameworks that load once and update in place as people move through them, responsive, uninterrupted, and able to handle complex data without the performance falling away.

How we help

We tune data fetching, state, and rendering so SPAs stay fast and fluid as data and interaction complexity grow.

We do serious JavaScript work on headless platforms like Shopify, Contentful, and Sanity. Decoupling the frontend lets us deliver faster, more engaging experiences with modern frameworks, and our depth in the headless ecosystem is what makes the resulting e-commerce and content platforms both scalable and genuinely flexible.

How we help

We decouple the frontend from headless commerce and CMS backends so experiences stay fast while content and catalogue scale independently.

We help engineering orgs scale by building the internal design system underneath them, a shared, documented set of reusable UI components and design tokens. With it, your product teams assemble consistent, high-quality interfaces far faster than rebuilding the basics each time.

How we help

We work with your designers to capture the visual language, then deliver a documented, tested component library that accelerates cross-team delivery.

JavaScript experts, AI-augmented

These are the AI coding tools our engineers use to ship faster and keep code clean, distinct from the AI systems we design and build for you.

CursorClaude CodeGitHub CopilotCodexWindsurfReplit

We use these tools inside strict guardrails, every line is reviewed by a person. See how we build →

1

Senior JavaScript engineers

Senior engineers with deep, hands-on JavaScript experience building production systems at scale.

2

Proven across industries

Our JavaScript teams have delivered frontend work across healthcare, finance, retail, and logistics, bringing domain awareness and hard-won patterns to every engagement.

3

Enterprise-ready delivery

We hold high standards for security, testing, and documentation, and can scale a JavaScript team up or down without sacrificing speed or quality.

The JavaScript toolset

The JavaScript tooling we rely on, grouped by what it does, and chosen deliberately from experience. Pick an area to see what we reach for and why.

We pick frontend frameworks from the project's scale, performance needs, and ecosystem maturity, so the chosen stack is a stable, long-term foundation for both the application and the team maintaining it.

React
Angular
Vue
Next.js
Nuxt
Svelte
SvelteKit

Our Node.js work puts performance and stability first for business-critical backends, building on modern asynchronous runtimes to deliver APIs that are fast, maintainable, and easy to observe in production.

Node.js
Express
Fastify
NestJS
Koa
Apollo Server
GraphQL Yoga

We tune our build and bundling pipelines for speed in both development and production, quicker CI/CD cycles and smaller, more efficient JavaScript payloads for users.

Vite
Webpack
Rollup
esbuild
SWC
Babel

We choose state-management and data-fetching libraries that fit the application's complexity, for a clear, predictable data flow that heads off bugs and keeps the app easy to debug and scale.

Redux Toolkit
Zustand
MobX
TanStack Query
SWR
XState

We use battle-tested libraries to handle the complexity of form state and validation, giving a more accessible, reliable experience while keeping the codebase simpler.

React Hook Form
Formik
Zod
Joi
Yup

We build on established UI component systems and modern CSS-in-JS or utility-first libraries for consistency and scale, speeding development while keeping the product polished and easy to maintain.

Material UI
Chakra UI
Ant Design
Tailwind CSS
Styled Components
Emotion
Storybook

We engineer real-time features on protocols like WebSockets, with connection stability and graceful error handling front of mind, resilient and performant even under heavy concurrent load.

Socket.io
ws
uWebSockets.js
Ably
Pusher

Our approach to quality pairs static analysis, code formatting, and a full suite of automated tests, all enforced in CI to catch errors early, hold consistency, and make releases fast and confident.

Jest
Vitest
Mocha
Chai
Cypress
Playwright
ESLint
Prettier

We standardise our deployment and observability stack so every application is repeatable, observable, and auditable, real operational insight backed by robust logging, tracing, and error monitoring.

Docker
GitHub Actions
GitLab CI
Sentry
Datadog
New Relic
OpenTelemetry JS
Pino

We secure applications with proven authentication libraries and sound session and token management, layering controls right through the stack from network headers to dependency scanning.

Helmet
Csurf
Passport
NextAuth.js
Auth0
Okta
JSONWebToken

We use serverless and edge platforms to lift performance and cut operational overhead, deploying functions closer to users for lower latency and a better experience overall.

Cloudflare Workers
Vercel
Netlify
AWS Lambda
Azure Functions
Engagement

How you'd work with us on JavaScript

Pick the level of ownership that suits you. We shape the engagement around your goals.

1

Staff augmentation

Add senior JavaScript engineers to a team you already have.

2

Dedicated team

A committed JavaScript team that runs like your own.

3

Full delivery

Hand over the build and we deliver it end to end.

Explore engagement models

JavaScript FAQ

Unsure which stack suits your build?

Tell us what you're building, and we'll help you pick and build with the right stack.

Book a discovery call