Full Stack Engineer

Duku AI; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

An innovative AI company is seeking a passionate individual to join their team in London. This role involves building autonomous testers that adapt and learn using AI technologies. The ideal candidate is driven, has experience in a startup environment, and is fluent in AI/LLMs like LangChain. You will engage with users to shape the product roadmap and manage the tech stack from development to production. This is an exciting opportunity to contribute to the future of software quality and testing.

Qualifications

• Relentless drive to execute fast and adapt quickly.
• Proven experience shipping product in a startup environment.
• Fluency with AI technologies, including LLMs.

Responsibilities

• Deploy daily and learn from user interactions.
• Engage with users to define the roadmap.
• Design LLM-powered testers that adapt in real time.
• Manage the technology stack from commit to production.
• Run experiments on models and pipelines.

Skills

Fluency with AI/LLMs

Relentless drive

Startup scar tissue

Product obsession

Tools

Python

TypeScript

LangChain

Job description

QA slows the world down. Flaky tests kill trust, stall releases, and bleed engineering velocity.

Duku AI is ending that era.

We’re building autonomous agents that think like engineers: they run every critical user journey, catch failures before users do, and self-heal as the codebase evolves. Real AI teammates, not test scripts that break on impact.

We’re venture-backed and led by operators who’ve scaled Meta’s testing infrastructure, launched Uber’s global playbooks, and grew Deliveroo from zero to hypergrowth. We know what elite execution looks like and we’re hunting for one more builder to help us rewrite the rules of software quality.

What You’ll Do

• Ship fast, learn faster: We deploy daily, not monthly
• Talk to users, shape the roadmap: Sit in the trenches with founders on calls that define what we build
• Train AI agents: Design LLM-powered testers that explore, learn, and adapt in real time
• Own the stack: Python, TypeScript, cloud infra, from commit to production
• Turn prototypes into production: Run real experiments on models, embeddings, and retrieval pipelines

What We’re Looking For

• Relentless drive: You execute fast, adapt faster
• Startup scar tissue: You’ve shipped product with no safety net
• Fluency with AI/LLMs: LangChain, vector stores, prompt engineering
• Product obsession: You care more about outcomes than outputs

Ideal Background

There’s no perfect pedigree. We hire for mindset, not credentials. That said, you might have:

• Shipped AI features in prod
• Built something from 0 to 1
• Thrived in chaos with high ownership

Why This Matters

Software is accelerating. QA hasn’t kept up. Autonomous testing is inevitable, and we’re building it.

Five years from now, every high-velocity team will rely on AI agents like ours to ship faster, safer, and smarter.

Join now, and help make that future real, before someone else does.