Careers

#Why Truster?

We're building Finland's smartest financial platform for light entrepreneurs and sole proprietorships. AI isn't a side feature for us—it's the core of the product. We automate invoicing, bookkeeping and taxation so entrepreneurs can focus on their own work.

#Open position: Senior AI Developer

We're looking for experienced AI developers who can wield Claude and modern LLM agents like a pro. You'll build production AI systems serving tens of thousands of entrepreneurs.

#What you'll do

• Build and optimize production LLM agents (including Claude) with tool use
• Design prompts, evaluations and fine-tuning to make them reliable and measurable
• Integrate AI into invoicing, bookkeeping and tax processes
• Keep production stable and fast—staying on top of latency, costs and quality

#What we expect

• Strong programming background (TypeScript and/or Python)
• Experience with LLM applications in production—especially Claude
• Understanding of agents, tool use and retrieval-augmented generation (RAG)
• Ability to take ownership and quickly deliver high-quality results