Web frontend development

For a fintech or banking product, the frontend is the only part of the system most users ever see. Authorisation flows, onboarding, dashboards and payments all succeed or fail in the browser, on whatever device and network the customer happens to have. A slow first paint reads as an unreliable company; a form that loses state reads as a product that might lose money. That is why we treat client-side work as product engineering, not decoration. Conversion, retention and support cost all trace back to interface decisions.

The buying problem is that frontend quality is hard to inspect from outside. Two builds can look identical in a demo and behave completely differently under a slow 4G connection, a screen reader or six months of feature changes. The differences live in the code: rendering strategy, state boundaries, accessibility semantics, the discipline of a design system. We make those choices visible - in architecture notes, performance reports and review-ready pull requests - so you can judge the work on evidence rather than screenshots.

Frontend is one discipline inside our wider web practice - start with the web development overview if you are still mapping the whole build.

A frontend degrades by default. Every sprint adds components, every marketing request adds a script, every dependency upgrade shifts behaviour, and the browsers underneath change on their own release cycles. Financial interfaces add their own pressure: dense data, strict accessibility expectations and zero tolerance for broken payment flows. Codebases that start clean become slow and inconsistent not through one bad decision but through hundreds of small unguarded ones. Holding quality therefore needs mechanisms, not intentions.

• Performance budgets in CI, so a heavy bundle fails the build rather than reaching users
• A design system as the single source of components, so screens cannot drift apart
• Typed contracts between interface and API, so breaking changes surface in development, not production
• Automated accessibility and visual regression checks on every pull request

These mechanisms are cheap to run and expensive to retrofit, which is why we install them in the first weeks of an engagement rather than after the first incident. The same discipline is what lets a small team move fast late in a project, when most frontends slow down.

For one of our frontends running in production, read the intelligent platform for carsharing case - a React and TypeScript frontend that reached its first release in five months.

Framework choice gets the attention, but the decisions that actually shape a frontend's life come after it. How each route renders - on the server, at build time or in the client - sets the ceiling on Core Web Vitals before a line of feature code exists. Where state lives, and which components are allowed to own it, decides whether the codebase is still understandable at fifty screens. Whether the design system is a real package with versioned tokens or a Figma file people glance at decides whether screen twelve matches screen two.

We record these choices as short architecture decision documents in the first sprint, with the trade-offs spelled out, so they survive team changes and can be revisited deliberately instead of eroding quietly. TypeScript is our default because typed component props and API responses move a whole class of defects from production to the editor. And we design the interface against explicit API contracts from day one, so frontend and backend teams can build in parallel instead of in sequence.

Those contracts have a second half - see server-side development for how we build the APIs the interface consumes.

Frontend work comes in two shapes. Most engagements are scoped builds: we take a product area or a whole interface from design to production with our own delivery team, working in sprints with a demo at the end of each. Where you already run a strong frontend team, we can instead supply senior engineers who slot into your existing delivery process - the staffing FAQ below covers that model. Either way the work is senior-led, with engineers who own decisions rather than tickets.

What moves the price is rarely the framework. It is the breadth of the browser and device matrix you genuinely need, the accessibility level you commit to, how mature your designs are when we start, the number of third-party integrations, and how much legacy has to stay alive during the transition. A short scoping exercise turns those drivers into a plan and an estimate you can hold us to, before any long commitment.

This is the model behind the review on this page: the CTO of $lana (Monetech) credits development from scratch, delivery synchronised with his own team, and first users on the product in five months.

Launch is the point where the real data starts. Lab numbers are predictions; the field tells the truth. We wire real-user monitoring so Core Web Vitals are measured on your actual customers' devices and networks, with client-side error tracking alongside, and review both against the budgets set during the build. The same dashboards are open to your team, so conversations about speed start from one shared set of numbers rather than competing impressions.

The quieter work matters as much. Browsers update on their own rapid cycles, frameworks deprecate APIs, and dependencies pick up vulnerabilities; we absorb those changes in small, regular doses, each landing as an ordinary reviewed pull request with an ordinary rollback path. The design system keeps evolving as the product does: new components enter through the same review, accessibility and documentation gates as the originals, so consistency holds at screen forty as it did at screen four.

Whether your team runs this or we do is a choice, not a default; either way the monitoring, dashboards and runbooks are yours, and nothing in the setup depends on us staying.