Founding Engineer

## About the role You'll be the first engineering hire and co-own the architecture of Mubit's core infrastructure. Mubit sits in the hot path of production AI agents — sub-80ms retrieval, ACL-gated shared state, pub/sub event triggers, execution history across agent fleets. The systems you build are why agents get more reliable over time instead of requiring constant human intervention. This isn't a spec-execution role. You'll identify the problems, own the trade-offs, and ship the solutions. Our office is in Canary Wharf (WeWork - 30 Churchill Place). ## What success looks like at 12 months - Retrieval latency is consistently under 80ms at real customer scale - The SDK is something engineers recommend to each other — not something they tolerate - You've made architecture calls we're still building on at 10x current load - Early customers have integrated Mubit into production agent stacks without hand-holding ## Your first 90 days - Get deep into the core storage and retrieval architecture — understand every trade-off already made and form opinions on what to change - Work directly with early customers integrating Mubit into their agent stack (LangGraph, CrewAI, AutoGen, etc.) - Profile latency, find the bottlenecks, fix them - Contribute to the SDK engineers use to connect their agents to Mubit - Make infrastructure decisions that will still be the right ones at 100x scale ## You're a fit if - You've built and run production systems — not just prototyped them - You understand distributed systems, storage trade-offs, and what it means to serve memory inside a hot execution loop - You can go from a vague problem statement to a working system with minimal direction - You have strong opinions about how infrastructure should be built — and you're willing to defend them - You care about the developer experience of the SDK you're building — you've been the frustrated user before - You're based in London and want to work on-site with the founding team, every day ## You're not a fit if - You need a well-defined spec before you can start - You've only ever built greenfield systems at scale — you've never had to make something work from nothing - You want to prototype forever and have someone else own production ## What we offer - 📈 Meaningful early-stage equity — priced to reflect that you're joining at the beginning - 💰 Competitive salary — we'll talk numbers early, no games - 💻 Brand new MacBook + hardware of your choice - 🏥 Private health insurance - 🏢 Canary Wharf office — flexibility to work from home when needed - 🍱 Deliveroo dinners when you're working late - 🚗 Uber home if you're in the office late — no one takes the night bus on our watch