Product discovery and MVP scoping
We define users, workflows, commercial assumptions and the smallest credible launch scope before expensive development begins.
BRADFORD · BUILDING FOR THE UK & BEYONDSHOPIFY PARTNERCUSTOM-CODED, NEVER COOKIE-CUTTER
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CUSTOM WEB APP DEVELOPMENT UK
Custom web applications that make an idea—or a difficult workflow—work.
Sales Leak Labs designs and develops bespoke web applications, SaaS products, customer portals, admin dashboards and internal tools for UK businesses and founders. We turn the problem into a scoped product, then build the customer experience and operating system behind it.
01Founder-led
Direct access to the person planning and building the work.
02SEO considered early
Structure, content and technical foundations planned before launch.
03Built around conversion
Every page and feature has a clear commercial job.
DOES THIS SOUND FAMILIAR?
The website or system should remove friction—not create more of it.
- A product idea needs more than an informational website.
- Important work is managed across spreadsheets, inboxes and disconnected subscriptions.
- Customers need a secure way to manage information or complete actions themselves.
- Your team cannot see the data it needs in one useful dashboard.
- An existing platform needs subscriptions, permissions, integrations or automation.
- You need an MVP, but cannot yet separate essential launch scope from future ideas.
WHAT WE CAN DELIVER
A complete build, shaped around the actual goal.
Full-stack web application development
Responsive customer-facing applications with the front end, database and server-side logic designed as one coherent product.
Admin dashboards and internal tools
Give your team a controlled place to manage users, content, activity, reporting and exceptions without touching the database.
Accounts, permissions and subscriptions
Authentication, user roles, paid plans, usage allowances, account controls and customer self-service journeys.
APIs, data and AI features
Connect external sources, automate data movement and use AI where it improves interpretation, classification or quality control.
Deployment and ongoing development
Production hosting, monitoring, release workflows and a prioritised roadmap for improving the product after launch.
RELEVANT WORK
Proof from products and businesses already in the world.
AI · SUBSCRIPTIONS · SHARED ROOMS
Ask The Movie
A natural-language recommendation product with accounts, usage limits, paid plans, collaborative rooms and an operational dashboard.
View case study APIS · AUTOMATION · ADMINDiscount Atlas
An affiliate platform that imports and manages changing offers and product feeds with AI-assisted checks, workflows and SEO at scale.
View case studyHOW IT WORKS
Clear enough for a first website. Rigorous enough for a complex build.
- 1
Map the problem
We document the people, actions, data, workarounds and commercial outcome the application must support.
- 2
Define version one
Essential scope is separated from later possibilities so the first release can prove something useful.
- 3
Prototype the journeys
Key screens and flows become visible before full development, reducing expensive ambiguity.
- 4
Build in working slices
The application is developed and reviewed as connected functionality rather than disappearing into one long build phase.
- 5
Launch and evolve
We deploy, monitor and prioritise improvements based on actual use, operational needs and commercial evidence.
COMMON QUESTIONS
What you may want to know before getting in touch.
What is the difference between a website and a web application?+
A website primarily explains and publishes information. A web application lets users perform ongoing actions—such as managing an account, entering data, collaborating, subscribing or completing a workflow—and usually includes more complex server-side logic and data.
Can you build an MVP for a startup?+
Yes. We help identify the smallest credible version that tests the important product and commercial assumptions without building every future feature at once.
Can you replace spreadsheets with a custom system?+
Often, yes. We first map what the spreadsheets, emails and manual checks currently accomplish, including exceptions, permissions and reporting, before designing a controlled workflow.
Can the application connect to our existing software?+
Usually, when those services provide suitable APIs, webhooks or export methods. Integration feasibility, data ownership and failure handling are checked during discovery.
How much does custom web application development cost?+
Cost varies significantly with user roles, workflows, data, integrations and risk. We provide a phased scope after discovery so the investment in version one and likely future work is clear.
Who owns the finished application?+
Project ownership, hosting, third-party services and handover are set out clearly in the proposal. We build maintainable products and do not rely on obscuring access to retain a client.
USEFUL READING
START WITH THE PROBLEM
Bring the rough idea, awkward workflow or spreadsheet that has become too important.
Tell us what you are trying to achieve, what is getting in the way and what you already have. We will help make the next step clearer.
Start a conversationA USEFUL FIRST STEP · FREE
Not sure where your website is losing customers?
Get a personal 10–15 minute video review of your website or online store, with three practical priorities to improve the customer journey. No account access, sales call or commitment required.