Senior Backend Product Engineer (Elixir)

Recruitee; Poznań; Hybrid; PLN 120,000 - 210,000; Full time

Benefits offered by this job

Hybrid work

Flexible hours

Training budget

Well-being support

MacBook and equipment

Fitness subscription

Work from anywhere

Job summary

Recruitee is seeking a backend-heavy product engineer to turn fuzzy AI ideas into trusted interfaces. You will own problems end to end—from shaping and building to shipping and validating impact—while collaborating across Backend, Frontend, Design, QA and DevOps.

Expect hands-on work with Elixir and AI stacks and opportunities to mentor teammates. In the first months you’ll learn the team, product and architecture, then take ownership of features, contribute to technical decisions, and help

Qualifications

• Commercial experience with Elixir or strong backend experience in RoR, Python, Java or PHP.
• Experience with Typescript and Mastra (AI TypeScript framework) or willingness to learn.
• Senior-level judgment: shipping features with quality and trade-offs in mind.
• Fluent English; Polish is a plus.
• Interest in building with AI and hands-on AI/LLM experience counts.

Responsibilities

• Own problems end to end: shaping, building, shipping and validating impact.
• Take ownership of features, participate in design discussions and code reviews.
• Collaborate with Backend/Frontend Engineers, Design, QA, and DevOps to deliver improvements.
• Mentor teammates and share knowledge through pairing and collaboration.
• Ensure features are well-tested, maintainable and meet quality standards.

Skills

Elixir

Backend development

Communication

Product thinking

Hands-on AI

Tools

Ruby on Rails

Python

Java

PHP

Typescript

Mastra

Job description

• 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


• First 3 months: You’ll get to know the team, our product, and our architecture while contributing to your first meaningful improvements. You’ll become familiar with our engineering practices and ways of working, supported by experienced teammates as you get up to speed with our Elixir and AI stack


• 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. You’ll work closely with your teammates to solve customer problems and deliver valuable product improvements


• 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. You’ll also help share knowledge across the team through collaboration, pair programming, and mentoring


• Building AI-powered features into mature products with real users, not a greenfield demo


• Working across the stack when the problem demands it (80/20 rule: mostly backend, comfortable following a problem into the frontend)


• 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

Benefits

• Hybrid work: You decide if and when you want to come to one of our offices.


• Flexible hours: Our employees can choose which working hours are the best for them


• Training budget: Up to €1500 per year for your personal development. You will keep your skills sharp


• Well-being support: Direct, free, and easy access to professional mental health support (provided by OpenUp)


• Equipment: We offer everyone a MacBook, a screen and Apple accessories


• Fitness subscription: We offer everyone a sports card that is acceptable in many fitness facilities.


• Work from anywhere: Take your laptop and work from anywhere (for up to 4 weeks/year)

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 ElixirExperience with Typescript and Mastra (AI TypeScript framework) or strong willingness to learn itSenior-level judgment: you have shipped enough to know when good enough is good enoughCommunication: fluent English, Polish is a plusProduct thinking: you push back on specs, evaluate trade-offs, prototype cheaply, kill your own ideas when data says soInterest in building with AI: hands‑on LLM/feature experience is a plus, curiosity and shipped experiments count too