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Kantrip
Careers · London

A game studio in everyone's hands.

Making a great mobile game still takes a studio, years, and an engine built for specialists. We're tearing that open. We're building an AI-native game engine — and the agents that drive it — so anyone can build real, native, high-performance games that scale and actually make money. Come build it with us.

See open rolesor email careers@kantrip.dev
Why we exist

Mobile games are a $150bn+ industry, and almost none of the tooling is built for the people who could be making them. The engines are heavy, the knowledge is specialist, the path from idea to a polished, shippable game is brutal. So most great game ideas never get made.

We think that's about to change. AI can do the heavy lifting of building a game — if it has the right engine underneath it. So we're building that engine in TypeScript, the language AI writes best, and the agentic pipeline on top of it that takes a game from idea to the App Store. People bring the taste; the machine brings the speed. The result is real game-making, in everyone's hands.

It's a hard problem and a genuinely new one. That's exactly why we picked it.

How we work

Ownership
Own whole systems, end to end. Small team, enormous surface area. You'll design your systems, build them, ship them, and tune them live.
Pace
Build with AI, move at its speed. We're AI-native to the core. We ship fast, learn faster, and expect everyone to push what agents can do.
In person
In the room, in London. We build side by side most days. No office yet — co-working for now, the right space as we grow.
Honest
Honest about the stage. We're early. There's real execution risk and founder-level intensity for the first stretch. We say so up front, because the people we want find that exciting, not off-putting.

Open roles

3 roles · London · always interviewing

We hire whenever we meet exceptional people. These seats stay listed even when they're filled: if one reads like it was written about you, apply regardless of timing.

The role

You'll own the engine itself: rendering, effects, physics integration, and the typed API surface our agents write games against. The unusual part of this job is that your primary user is an AI agent. You design APIs a machine can't misuse: budgets built in, jank designed out, game feel available as vocabulary rather than folklore. You'll work directly with the founder, with a strong bench of senior advisors behind the deep specialist calls.

What you'll do
  • Build renderer and runtime systems in TypeScript on our custom WebGPU pipeline, 2D and 3D, shipping natively to iOS and Android.
  • Hold the performance bar: smooth frame rates on low-end Android, strict frame budgets, allocation-free update loops.
  • Design the agent-first APIs for particles, boards, effects and juice: the vocabulary every Kantrip game is composed from.
  • Take systems from blank page to shipped game. Your code runs in every title on the platform.
What we're looking for
  • You've shipped real-time work: games, graphics, or performance-critical mobile. You've fought for frames on a real device and can tell the story line by line.
  • Exceptional TypeScript, and comfortable reasoning about GPUs, memory, and garbage collectors.
  • You live in AI toolsand find it exciting, not threatening, that your API's main consumer is an agent.
  • Based in (or moving to) London, up for building in person.
Bonus
  • You've shipped a mobile game solo, however small.
  • Engine, renderer, or physics work in any stack: Unity, WebGL, PlayCanvas, custom.
  • Shaders (WGSL/GLSL), React Native internals, or profiling war stories.
Think this is you?Send an emailor email careers@kantrip.dev

How we hire

We keep it short, we pay for your time, and you know the bar at every stage.

01 · Intro call
30 minutes. We pitch you; you pitch us; we both decide if it's worth continuing.
02 · Technical walkthrough
60 minutes. You walk us through the best thing you've built: your code, your screen.
03 · Paid exercise
£250 flat, 2 to 4 hours, done in your own time within a week. AI tools allowed and expected: that's how we build. The pass criteria are stated upfront. Followed by a 30-minute debrief on how you approached it.
04 · Coffee
In person in London, plus references. Then a decision, fast.

End to end in about two weeks.

Don't see your role?

If you're exceptional and you want to help put game-making in everyone's hands, we still want to hear from you.

Get in touch

We hold applications for up to 6 months and delete unsuccessful candidates' details after that. See our Privacy Policy.