Custom Web App Development

An AI workflow is a background process — triggered by an event, it runs logic and takes actions without a human watching. A custom web app is the interface humans actually log into: a dashboard, a portal, a quoting tool. Most real engagements combine the two — the app is the cockpit, the workflow is the engine. We deliver them as one fixed-fee project.

Internal tools and admin dashboards, client and customer portals, bespoke quoting and booking apps, intake forms with complex logic, and lightweight SaaS MVPs for founders. We do not build mobile-native apps (iOS/Android) — everything is a responsive web app that works on phone, tablet and desktop from a single codebase.

TanStack Start (React 19 + Vite) for the frontend, Postgres for the database, edge-hosted server functions for business logic, and integrations with whatever third-party APIs you need (Stripe, Xero, HubSpot, OpenAI, Anthropic, Shopify, and so on). The stack is modern, fast, fully indexable, and any competent React developer can maintain it after we deliver.

Most focused apps go live in four to ten weeks. A simple internal dashboard or quoting tool sits at the four-to-six-week end. A client portal with auth, role-based access and multiple integrations is six to ten weeks. We always run a paid discovery sprint first to lock in scope, timeline and fixed fee before the build begins.

Focused internal tools and simple quoting apps from £6,000. Client portals with auth and integrations typically £10,000–£18,000. Lightweight SaaS MVPs £15,000–£25,000. Every project is fixed-fee with the price agreed in writing before any work begins, plus an optional monthly retainer for ongoing changes.

Always. You own 100% of the source code, the designs, the database and the hosting accounts. Nothing is built on proprietary tooling you cannot leave. If you ever want to move the app to another developer, you can — and they will recognise the stack.

Yes — this is one of the most common combined engagements. The app is the UI your team or customers use; the workflow is what runs when they submit a form, click 'approve' or hit a scheduled trigger. Both can be quoted, designed and delivered as a single project.

Yes. Hosting on Cloudflare's edge network, authentication via Supabase Auth (email, magic link, Google), row-level security in Postgres, encrypted secrets, GDPR-compliant logging and full audit trails are standard on every build. We can also sign a Data Processing Agreement before work begins.