Senior direction
Architecture, trade-offs and implementation stay developer-led.
Build better products faster with expert use of LLMs and AI.
Flat 18 is a digital product agency. We design and build software for teams dealing with dense workflows, technical systems and products that have to work.
Senior controlArchitecture, security and release stay in expert hands.
Weeks, not monthsLLMs speed up drafts, tests, docs and build decisions.
Code you ownRepository, roadmap and technical decisions included.
When Flat 18 fits
Top reasons teams call us.
- 01
Prototype needs to become a product
We make brittle first builds clear, stable and ready to ship.
- 02
Launch, backlog or product direction needs momentum
We focus the work and make the calls that get a credible release out.
- 03
You need a technical co-founder
We bring senior product and engineering judgement from first decision to release.
Send the product link, prototype or idea. We’ll tell you what to fix first.
Projects we've worked on
Social Publisher
Publishing operations frictionTurns scattered publishing checks into channel variants, validation, calendars, logs and retries.
Turned scattered social publishing work into a structured product teams can operate with less manual checking.
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SignalMap
Actionable analyticsTurns privacy-limited browser signals into aggregate reporting and practical recommendations.
Turned browser signals into a readable product that points teams towards the next useful fix.
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Ledger
Informal money trustTurns fragile shared money records into balances, receipts and proof people can explain.
Turned informal money tracking into clear records for loans, shared costs, project budgets and read-only review.
View projectAI speed. Senior control.
LLMs accelerate the work. Experienced developers make the calls.
Fast iteration
LLMs help explore UI, code, content and tests quickly.
Curated output
We refine, test and integrate. We do not ship raw AI output.
Production awareness
Data, permissions, deployment and maintainability are considered from the start.
Technology we use
The technology behind the speed.
A focused modern stack for building products end to end. The tools change with the work; the judgement behind their use does not.
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Product design and web development
Choose the level of product help you need, from a focused MVP to an ongoing delivery partner.
MVP Sprint
For focused first versions.
- Product scoping
- UX/UI direction
- Full-stack MVP build
- LLM-assisted implementation
- Deployment support
Product Build
For serious end-to-end launches.
- Product planning
- Interface design
- Frontend and backend development
- Authentication, database and integrations
- Testing and release support
Monthly Studio
For ongoing product work.
- Feature delivery
- UX improvements
- Technical support
- Refactoring
- Product experiments
Not sure which route fits?
Send the goal, deadline and main risk. We'll suggest the leanest responsible route.
Pricing
Pricing for serious product work
Clear routes for MVPs, builds and retained product support.
Curated MVP Sprint
2-6 weeks
Starting at
£3,500
For focused first versions.
Best forMVPs, demos and early user testing
- Product scoping
- UX/UI design direction
- Full-stack MVP build
- Deployment support
- Handover notes
Complete Product Build
6-12+ weeks
Starting at
£12,000
For serious end-to-end launches.
Best forDashboards, web apps and product systems
- Product planning
- Interface design
- Frontend and backend development
- Auth, database and integrations
- Testing and deployment
Monthly Product Team
Monthly
Starting at
£2,995/month
For ongoing product work.
Best forLive products with a steady backlog
- Monthly development capacity
- Feature iteration
- UX improvements
- Technical maintenance
- Product experiments
Final pricing depends on scope, integrations and release requirements.
Not sure which route fits?
Share your goal and constraints. We will recommend the leanest responsible route.
Tell us what you want to build
Share the goal, deadline and current state. We will reply with the best route and next step.
Ready to ship something better?
Flat 18 can help you shape, build and ship it faster with senior developers directing the LLM-assisted process.