Frontend Development Services

What frontend development covers

Frontend development turns designs into working interfaces in the browser: layout, interactivity, forms, data fetching, state management, accessibility and performance. It decides how fast your product feels, whether it works on every device and whether users with disabilities can use it — all of which affect conversion, retention and search rankings.

Frontend technologies we use

Our frontend services

Quality standards

• TypeScript with strict settings
• Component tests and end-to-end tests with Playwright
• Performance budgets checked in CI
• Accessibility checks with axe and manual screen-reader testing
• Responsive behaviour tested on real devices
• Storybook for documented, reusable components

Performance and SEO

Frontend choices directly affect Google rankings through Core Web Vitals. We use server rendering or static generation where SEO matters, optimise images and fonts, split code so each page loads only what it needs, and monitor real-user performance after launch.

The cost of a slow or inaccessible front end

The front end is where business results are won or lost. Research by Google and others has repeatedly shown that slower pages lose visitors: as load times rise, bounce rates climb and conversions fall. Core Web Vitals — measures of loading speed, responsiveness and visual stability — also feed into Google’s ranking systems, so performance problems affect both traffic and revenue.

Accessibility has a similar impact. Around one in four adults in the United States reports some form of disability, and websites that cannot be used with a keyboard or screen reader exclude them entirely. Accessibility-related legal claims against US websites have risen steadily in recent years. Building accessible components from the start is far cheaper than retrofitting them later, and it improves usability for everyone.

Modernising a legacy front end

Many products still run on jQuery, AngularJS or early React patterns that are hard to maintain and hire for. A full rewrite is risky, so we usually modernise incrementally: introduce a modern build pipeline and TypeScript, wrap the old application so new screens can be built in React or Next.js alongside it, and migrate screen by screen, starting with the most-used or most-changed parts. Users see steady improvements while the business continues as normal.

React, Next.js, Vue or Angular: a practical comparison

All four are mature, well supported and capable of powering large products. The right choice depends less on raw capability and more on your team, your rendering needs and how much structure you want the framework to impose. This is how we compare them when advising clients:

If you are unsure, start from the rendering requirement: public pages that must rank in search point towards Next.js; an authenticated dashboard can be a plain React single-page app; an enterprise team that values strict structure often prefers Angular; and teams improving an existing server-rendered site step by step frequently choose Vue. Whichever you pick, we write it in TypeScript.

Reference architectures we use

Most front ends we build follow one of three patterns. Choosing the pattern early avoids expensive rewrites when the product grows.

Across all three we use a shared component library or design system, a typed API client generated from the back-end schema, and environment-specific configuration so the same build moves safely from staging to production.

Security on the front end

Browsers run code in an environment you do not control, so front-end security is about limiting what can go wrong. Our baseline for every project:

• A Content Security Policy that restricts where scripts, styles and frames can load from
• No secrets in client-side code — API keys that must stay private live on the server
• Authentication tokens in secure, HTTP-only cookies rather than local storage where the architecture allows
• Output escaping by default, with any use of raw HTML reviewed explicitly
• Dependency scanning in CI and a lockfile so builds are reproducible
• Third-party scripts (analytics, chat, tag managers) loaded deliberately, because each one can slow or compromise the page

Building and growing a front-end team

A front end is shared territory: designers, product managers, back-end engineers and marketers all depend on it. Small teams work best with one senior front-end engineer who owns architecture and conventions, supported by developers who can move between features. As the product grows, a dedicated design-system owner pays for itself by keeping components consistent and reducing duplicated work.

If you need extra capacity, you can hire front-end developers or specialists such as React developers and Angular developers to work inside your existing team, following your code review and release process.

Measuring front-end quality

We agree measurable targets at the start of a project so quality is not left to opinion. Core Web Vitals — Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift — measure how fast and stable pages feel to real users, and are tracked from field data as well as lab tests. Bundle-size budgets in CI stop pages from slowly getting heavier with each release. Accessibility is checked automatically with axe and manually with keyboard and screen-reader passes, aiming for WCAG 2.2 AA.

Visual regression tests compare screenshots of key screens before and after each change, catching layout breaks that unit tests miss. End-to-end tests in Playwright cover the journeys that matter most — sign-up, checkout, search, form submission — on desktop and mobile viewports.

Upgrading an ageing front end

Front ends age quickly: jQuery-era sites, AngularJS applications, class-component React code and abandoned build tools are common. A full rewrite is rarely the best first step. We usually start by adding TypeScript and tests around the riskiest areas, upgrading the build tooling, and then replacing screens or components incrementally, so that users benefit from improvements every few weeks instead of waiting months for a relaunch.

Where a rebuild is the right answer — because the existing code is unmaintainable or the design is changing completely — we plan it alongside SEO redirects and analytics continuity. See website redesign and web application development.

State management without overengineering

Many slow, hard-to-change front ends suffer from state management chosen for scale they never reached. We separate state into three kinds: server data (fetched and cached with tools such as TanStack Query or framework data loaders), URL state (filters, tabs and pagination that should survive a refresh or be shareable), and local UI state (open menus, form drafts). Only genuinely global client state — the signed-in user, a shopping basket, a theme preference — goes into a store, and often a small one is enough.

Related services

Frontend work usually pairs with backend development and UI/UX design. Need frontend engineers in your team? See hire React developers.

Explore more in Software Development Technologies We Use.