Development · Web

Custom web application development

We design and build web applications around how your business works: client portals, internal tools, booking and ordering systems, and SaaS products. We stay on to maintain them after launch.

Book a free consultationHow it works ↓

What's included

What our custom web applications service covers

  • 01

    Discovery & scoping

    Requirements, user flows and a clear estimate before development starts.

  • 02

    UX & interface design

    Screens designed and tested with real users, not guessed.

  • 03

    Development

    Frontend, backend and database, built in two-week increments with demos.

  • 04

    Integrations

    Connected to your existing systems, payments and third-party services.

  • 05

    Testing & security

    Automated tests, code review and security checks on every release.

  • 06

    Launch & support

    Deployment, monitoring and ongoing maintenance.

When to bring us in

Signs it's time

  • 01Your team works around a spreadsheet that's grown too big
  • 02Off-the-shelf software fits only 70% of your process
  • 03Customers need a portal to order, track or self-serve
  • 04You have a product idea that needs a first version
  • 05An existing internal tool is slow and hard to change

Process

How it works

  1. 01

    Scope

    Goals, users and must-haves.

  2. 02

    Design

    Flows and interfaces.

  3. 03

    Build

    Two-week cycles with demos.

  4. 04

    Launch

    Go live, monitor, improve.

Technologies we work with

  • TypeScript
  • React
  • Next.js
  • Node.js
  • .NET
  • Python
  • PostgreSQL
  • Azure
  • AWS

FAQ

Frequently asked questions

How long does it take to build a web application?

A focused first version typically takes a few months. We agree on the scope for that first version so you can start using it early and add features later.

Who owns the code?

You do. The code lives in your repository from day one, along with the documentation.

Can you work with our in-house developers?

Yes. We can lead the project or join your team and follow your processes and tools.

What happens after launch?

You can take over maintenance, or we continue with monitoring, updates and new features under a managed services agreement.

Related services

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Until 31 December 2026

Talk to an engineer about custom web applications

Your first two consultations are free. Tell us where you are now and where you want to be, and we'll give you an honest view of the options.

Book a free consultationhello@deverlin.com