Service
Web application development
We build web applications that work — fast, modern, and built for how people actually use software today: on a phone, found through AI-powered search, and expected to load in under a second.
Service
We build web applications that work — fast, modern, and built for how people actually use software today: on a phone, found through AI-powered search, and expected to load in under a second.
What is it
A web application is software that runs in a browser — more capable than a static website, but without the friction of installing a native app. It can manage user accounts, process and store data, connect to other systems, and update in real time. Common examples include customer portals, internal business tools, booking systems, dashboards, and SaaS products. The distinction from a website is simple: a website presents information; a web application does something.
What we build
Internal platforms that replace spreadsheets, email chains, and manual tracking: approval workflows, reporting dashboards, inventory systems, and operations tools. Built for your team, not the general public — fast, focused, and designed around how your business actually works.
Secure portals where your clients log in, submit information, track the status of their requests, access documents, or complete tasks. Replaces back-and-forth email and gives your clients a professional, self-service experience.
Multi-tenant software products you sell to other businesses — built to scale from the first customer to the thousandth without a rewrite. We design the data model, authentication, billing integration, and deployment architecture from the start, so growth does not create technical debt.
Fast, conversion-optimised sites built on the same stack as our applications — not WordPress. Statically generated pages that load in under a second, score well on Core Web Vitals, and are structured for AI-powered search (Google AI Overviews, Perplexity, ChatGPT) as well as traditional SEO.
How we build it
We map the user flow and data model before writing a line of code. Most expensive web application problems — wrong data structure, missing user role, impossible edge case — are discovered in the planning step, not during build.
We ask detailed questions, produce a clear scope, and give you a fixed quote before anything is built.
We build on Next.js and TypeScript — not because they are fashionable, but because statically generated pages load faster, rank higher in search, and cost less to host than server-rendered alternatives. TypeScript means the codebase is typed and maintainable: any competent developer can pick it up, not just the team that built it.
We host on Vercel — globally distributed, zero DevOps overhead, automatic deployments on every code change.
You test against real scenarios before anything goes live. We do not disappear after delivery — we watch the first real usage with you, address anything that does not behave as expected, and hand over documentation and access so you are genuinely in control of what you own.
Why Hemlex
We do not only build for clients — we build and operate our own software products. That means we have direct experience of what it takes to keep a web application running reliably after launch: monitoring, error handling, deployment pipelines, and the slow accumulation of edge cases that only real users find. We build client projects with the same standards we apply to our own.
Every application we build is designed for mobile screens first and desktop second — not adapted afterward. We also structure content and metadata for AI-powered search (Google AI Overviews, Perplexity, ChatGPT search), which is increasingly how business buyers find service providers. This is not an add-on; it is part of how we build.
When the project is done, you receive the full codebase, the deployment configuration, and access to every service and account involved. There is no ongoing dependency on us to keep the lights on — though we are available if you want us to be.
Our standard stack: Next.js (App Router) for the application framework, TypeScript for type safety, Tailwind CSS for styling, Prisma for database access, and Vercel for hosting. We choose this stack because it is proven, well-documented, and supported by a large community — not because it is new. Every choice is justified by what it does for the application, not by what is fashionable.
Frequently asked questions
It depends on the scope. A focused internal tool — for example, a project tracking dashboard for a team of ten — costs significantly less than a multi-tenant SaaS product with billing, user management, and a public API. We scope every project before we start and give you a fixed quote. Small applications typically start from a few thousand euros; larger products from tens of thousands. We will give you a specific estimate within one business day of understanding your requirements.
A focused application with a clear scope takes four to eight weeks from the start of build to handover. Larger products with multiple user roles, complex integrations, or a phased feature set take longer — typically three to six months for a first version. We give you a realistic timeline before we start, not an optimistic one. The planning step exists specifically to surface complexity early so timelines do not slip mid-project.
No. We build custom web applications in Next.js and TypeScript. For a simple informational website, WordPress or a no-code platform may be the right choice — and we will tell you that honestly if it is. But for anything that handles user accounts, processes data, connects to other systems, or needs to scale, a custom build gives you control, performance, and long-term maintainability that no-code tools cannot match. No-code platforms also introduce a dependency on the platform vendor — if they change pricing, discontinue a feature, or shut down, your application is at risk.
You do, completely. We hand over the full codebase in a repository you control, along with access to every service, account, and configuration involved in running the application. There is no ongoing licensing fee, no proprietary format, and no dependency on us to keep it running. Any competent development team can take over from where we left off.
Usually yes. We review the existing codebase first and give you an honest assessment — what is worth keeping, what needs to be refactored, and what should be rebuilt. We do not inherit problems silently: if the existing code has structural issues that will cause problems later, we tell you before we start, not after. The review itself is free as part of scoping.
Yes. We offer ongoing support and development after launch — bug fixes, new features, dependency updates, and performance work. We discuss the terms of ongoing support as part of the initial project scope, so there are no surprises after handover. We are also happy to hand over to an internal team or another agency if that is what you prefer.
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