Senior Backend Product Engineer (Elixir)

Our Intelligence team builds the AI capabilities that run across the whole Tellent suite. We're looking for a backend-heavy product engineer who can take a fuzzy "AI should help here" idea and turn it into an interface people actually trust and use.

You'll own problems end to end: shaping, building, shipping, and checking whether it moved anything. Your 12-Month Journey:

• First 3 months: You'll get to know the team, our product, and our architecture while contributing to your first meaningful improvements.
• Within 6 months: You'll take ownership of features and contribute to technical discussions, code reviews, and improvements to the scalability, reliability, and maintainability of the platform.
• After 1 year: You'll be a trusted technical partner within the team, taking ownership of significant parts of the product and contributing to technical decisions and architectural discussions.

Responsibilities:

• Building AI-powered features into mature products with real users.
• Working across the stack when the problem demands it.
• Take ownership of the features you deliver, ensuring they are well-tested, maintainable, and meet our quality standards.
• Collaborate closely with Backend and Frontend Engineers, Design, QA, and DevOps to solve complex problems and deliver valuable product improvements.

Requirements:

• Commercial experience with Elixir, or strong backend development experience in technologies such as Ruby on Rails, Python, Java, or PHP combined with a strong motivation to learn Elixir.
• Experience with Typescript and Mastra or strong willingness to learn it.
• Senior-level judgment: you have shipped enough to know when good enough is good enough.
• Product thinking: you push back on specs, evaluate trade-offs, prototype cheaply, kill your own ideas when data says so.
• Interest in building with AI: hands-on LLM/feature experience is a plus, curiosity and shipped experiments count too.
• Communication: fluent English, Polish is a plus.

Benefits:

• Hybrid or remote working setup across Amsterdam, the Cologne area, or Poland.
• A chance to shape one of the most ambitious scale-ups in Europe and lead a company-defining tech transition.
• Work in a diverse, multicultural, and remote-friendly team.
• €1,500 annual training budget + 2 dedicated learning days.
• Pension plan, travel reimbursement, and wellness perks.
• 28 paid holiday days + 2 additional days to relax.
• Work from anywhere for 4 weeks/year.
• Apple MacBook and top-tier tooling.
• €200 home office budget.