AI Engineer

About the Role This is a hands-on engineering role at an early-stage, Y Combinator–backed AI productivity startup. You'll tackle two of the team's most critical technical challenges — backend scalability and LLM/AI agent flow optimization — in ways that directly shape platform performance and user experience. What You'll Do Design and implement backend systems and services built to operate at scale. Tune and iterate on LLM integrations and AI agent orchestration to improve reliability and efficiency. Own end-to-end technical challenges across the stack, from architecture decisions to shipping production code. Collaborate closely within a small, fast-moving engineering team where your contributions have immediate impact. What We're Looking For 5+ years of backend software engineering experience delivering scalable systems in production. Hands-on experience optimizing LLMs and AI agent workflows in live production environments. Proven track record of shipping software over time; practical experience is valued over formal credentials. Experience working at fast-growing startups; a startup-motivated mindset is essential. Strong side-project portfolio demonstrating technical depth and sustained curiosity. High agency, clear ownership, and intentional career choices that reflect genuine commitment to craft. Based in Stockholm or legally eligible to work and relocate to Stockholm (visa sponsorship is not available). Compensation & Benefits Salary range: $80,000–$120,000 USD annually, plus equity. Flexibility exists for exceptionally senior candidates, with a negotiable salary/equity mix. Visa sponsorship is not available . Location On-site in Stockholm, Sweden . Candidates must be based in or able to relocate to Stockholm and hold the right to work in Sweden.