UK software development agency · Est. 2016
We build software, apps, and websites. Then we hand them over and they actually work.
Polyphasic Developers is a UK software agency run by a small team of engineers and product people. We've been building custom software, web apps, mobile apps, and internal tools for businesses since 2016 — from a sole-trader operation in Lincoln to a Limited company with clients across the UK, North America, and beyond.
Most of our work is one of three things: something new that needs building, something old that needs replacing, or a manual process that needs automating. If you'd like to understand what we actually do before getting in touch, read what Polyphasic Developers is.
What we do
What we do.
Scroll through the core areas. Most projects sit somewhere across these, not neatly inside one box.
Why clients come back
We give a straight answer, do the work, and don't disappear.
- You'll get a real cost and timeline before anything starts — not a vague estimate that grows.
- We work across software, apps, websites, and automation, so you don't need a different agency for each one.
- We care whether the thing we built is still working for you six months later.
"Most clients come to us because something isn't working — a system, a site, a process. We're not here to sell a retainer. We're here to fix the thing."
— James Colby, FounderSelected work
Some of what we've built.
Client projects, internal products, and apps — ranging from fleet compliance tools to AI-powered platforms and local business websites.
How we work
How a project actually runs.
No 40-page proposals. No six-week discovery phases before anything gets built. Just a sensible path from problem to shipped.
Understand the problem
We talk through what's not working, who it affects, and what good looks like. This is where most bad projects go wrong — so we take it seriously.
Agree on scope
We set a realistic scope, pick the right technology for the job, and give you a number you can hold us to.
Build and ship in stages
We deliver in stages so the work creates value before it's fully complete — not just at the end of a long wait.
Hand over cleanly
We can stay involved, hand over to your team, or anything in between. Either way, you leave with something you own and can run.
Let's talk
You don't need a perfect brief to get in touch.
Tell us what's not working or what you're trying to build. We'll tell you honestly whether we're the right fit — and what it would actually take to fix it.