We’re looking for a Principal AI engineer who can design, build, and scale AI systems end-to-end, while taking ownership of architectural decisions and contributing to the company’s overall AI strategy.

Define and drive AI architecture and strategy across one or more of our ventures
Design and build AI systems end-to-end (from prototype to production)
Architect AI services that integrate seamlessly with our backend systems (primarily Node.js/TypeScript)
Evaluate new models, tools, and frameworks and decide what's worth adopting
Collaborate closely with a small, high-performing cross-functional team to ship AI-first features
Ensure scalability, reliability, security, and cost-efficiency of AI solutions
Operate with high ownership and autonomy in technical decision-making
Mentor engineers and raise the overall AI expertise within the company
7+ years in software engineering, with at least 3 years focused on AI/ML systems
Proven experience designing and deploying production-grade AI solutions
Strong understanding of LLM-based systems — RAG, agents, fine-tuning, evaluation frameworks
Hands‑on with Python and AI/ML tooling (PyTorch, Hugging Face, LangChain, or similar)
Working experience with Node.js/TypeScript (our core backend stack)
Solid grasp of embeddings, vector databases, retrieval systems, and data pipelines
Experience exposing AI services via REST or GraphQL APIs
Cloud infrastructure experience (AWS, GCP, or Azure)
Strong system design skills and the ability to translate business problems into robust AI solutions
Experience mentoring engineers and leading technical decisions
Experience building AI‑native products from scratch
Familiarity with multi‑agent systems and MLOps practices
Track record of optimizing model performance, latency, and cost
Startup or venture‑building experience

What's in it for you

Competitive compensation aligned with your experience and the market
High‑impact role with direct influence on product and AI strategy
Home office budget
100% covered sick leave
Remote, hybrid, or office — your call
Paid parking or public transport
Free breakfast, lunch, snacks, coffee, and drinks in the office
Multisport card (50% co‑funded)
Additional perks and benefits

Apply for this position

We’re a multilingual company, but English is our official language for all communication. Please complete your application in English. Depending on your background, parts of the selection process may also take place in Croatian or German to help you fully express yourself.

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Martian

Jobs:

Principal AI Engineer

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