WhyBrilliant is sourcing applicants for this role on behalf of an agile, Berlin-based AI startup transforming enterprise IT workflows. The company’s identity stays confidential until first contact.Also searchable as: Full Stack Engineer | Software Engineer, Product | AI Product Engineer | Software Engineer – AI Products. Original title: Product Engineer (m/f/d).The company is building the AI operating system for Autonomous Enterprise IT. You’ll build on a battle-tested LLM harness, ship AI-native product to Fortune 500 companies, and own features end to end.Why this role matters At the company, every business idea becomes technology impact with AI agents for every tech demand. Across the world’s largest companies, IT leaders spend their days manually governing application portfolios with spreadsheets and disconnected tools — resulting in bloated backlogs, redundant software, and uncontrolled spend. The company changes this fundamentally with a system that understands enterprise landscapes bottom-up and reasons at machine scale, already trusted by major enterprise names across industry.What you’ll do - Design and deploy complex, multi-agent workflows and LLM evaluation harnesses using Python, Kotlin (Spring Boot), and TypeScript (React/Next.js). - Bridge the gap between engineering and product by sitting on customer calls and running rapid user testing sessions to shape the roadmap. - Craft intuitive user interfaces that translate complex AI-driven data structures into clear, actionable dashboards. - Take full operational responsibility for the health and performance of shipped code in production. - Build, test, and benchmark proprietary AI agents against expert human baselines to ensure enterprise-grade accuracy.Who this is a fit for - Built and shipped production software for 3–6 years, preferably in B2B SaaS or high-growth startup environments. - Hands-on experience building agentic systems or complex LLM workflows (including side projects), with a focus on tools and evaluations. - Develops daily using AI-native coding workflows and tools like Cursor and Claude to ship code faster. - Strong full-stack capabilities across Kotlin (JVM), TypeScript, and Python. - A sharp eye for UI/UX design and deep empathy for the end-user’s experience. - Based in Europe, ready to work hybrid in Berlin, with fluent English (German is a strong plus).Culture A highly collaborative, fast-moving team of 11 working hybrid in Berlin’s Prenzlauer Berg. Decisions are rapid and low-friction, made at the whiteboard rather than in long meetings. Small sub-teams of 2–3 engineers build and deploy continuously, with strong social connection — regular shared lunches and time together as a team. Every engineer takes complete operational ownership of their shipped code in production.What you get - High-ownership product culture with continuous deployment in highly agile sub-teams of 2–3 engineers. - Zero corporate bureaucracy or endless alignment meetings, favoring quick decisions at the whiteboard. - Strong social connection with a close-knit team of 11 that values shared lunches and real relationships. - True hybrid autonomy with a beautiful, collaborative office in Berlin’s vibrant Prenzlauer Berg.This job is hosted on whybrilliant.com. Use your LinkedIn profile to register on WhyBrilliant.com and apply for the role directly. You will then chat to the AI-Agent over chat bot or voice to confirm your career details.Job Ref: WB-144

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