Combinely
Founding AI Engineer (UK)
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About the role
Hiring founding engineers to build the future of how accounting work gets done.
Reshaping an industry takes hard work. We're looking for high-agency engineers who combine technical excellence, strong product taste, and a deep appetite to delight customers.
At Combinely, engineering doesn't stop at the codebase. It means jumping on a plane to work alongside customers, moving with urgency when a user reports an issue, and thinking deeply about how to turn powerful AI systems into products people trust, rely on, and love using every day.
About Combinely
Combinely is building an AI coworker for accountants.
Accounting firms are under huge pressure: shrinking talent pools, rising client expectations, and too much repetitive work across emails, documents, spreadsheets, tax research, and review. Combinely bridges the gap with an AI coworker that uses the same tools and knowledge to produce client-ready work just like a seasoned accountant.
Built by an ex-Google/Deloitte team, we're growing fast, backed by top investors, and already live inside leading accounting firms across the world.
What you'll do
- Deliver magic – design, build, and ship agentic AI systems that can reason, use tools, and solve complex accounting tasks reliably.
- Work with customers – talk to users, sit with customers, understand what matters, and turn messy real-world problems into a delightful product.
- Own outcomes – measure whether what we ship actually saves time, improves quality, and becomes indispensable to customers.
- Build the company – help recruit the next wave of engineers and establish a positive, intense, high-performance culture.
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You'll be a fit if you are:
- Ambitious: you want to work hard on a hard problem, and you're excited by the pace of an early-stage startup.
- Customer-obsessed: user problems energise you, and you measure success in real-world impact.
- High agency: you default to action, break through blockers, and leave things better than you found them.
- Product-minded: you have strong taste, notice details others miss, and care about building something customers genuinely love.
- Growth-oriented: you're excited to wade into the deep end, learn fast, and take ownership beyond your job title.
Your experience | Requirements
- 2+ years building and shipping production software.
- Experience building and shipping LLM-powered products.
- Use tools like Claude Code, Codex, Cursor intensely.
- Excited to work directly with customers, not just through tickets or product specs.
- Willing to travel to customer sites when needed.
- Excited to work in-person with us in London 5 days a week.
- Authorised to work in the UK.
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Interview process
We aim to move fast and give an answer within 24 hours after each stage. You can expect an offer within 2 weeks from application.
- Founder call, 30 mins – get to know each other and make sure we're on the same page.
- Take-home task, 72h – a realistic task you might take on at Combinely.
- On-site interview, 2–3h – deep-dive on your take-home, extend it with a new feature, walk through past projects, and have an open culture chat.
Why join now
- Own meaningful equity – enough to not need another job if we succeed.
- Mentorship + autonomy – work shoulder-to-shoulder with the founders, not through layers of management.
- Impact – solve hard problems, influence product strategy, and reshape an entire industry.
Looking forward to seeing your application!
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