Senior Backend Engineer (AI Product Engineering)

Recruitee; Województwo wielkopolskie; Hybrid; PLN 264,000 - 440,000; Full time

Benefits offered by this job

Hybrid work

Flexible hours

Training budget

Well-being support (OpenUp)

MacBook and equipment

Fitness subscription

Work from anywhere (up to 4 weeks/year

Job summary

Recruitee is seeking a backend-heavy product engineer who can turn fuzzy AI ideas into interfaces people trust and use. You’ll own problems end to end: shaping, building, shipping, and verifying impact across the Tellent suite.

First 3 months you’ll get up to speed with Elixir and AI stack, collaborating with teammates. After 6 months you’ll own features and discuss scalability, reliability, and maintenance with the team. Fluency in English is required; Polish is a plus.

Qualifications

• Senior-level backend engineer with shipped Elixir experience or strong backend background.
• Experience with AI features and LLMs is a plus.
• Fluent English; Polish language is a plus.
• Ability to own features end to end and mentor teammates.
• Willingness to learn Elixir if not proficient yet.

Responsibilities

• Own features end to end from idea to delivery.
• Collaborate with Backend/Frontend, Design, QA and DevOps.
• Ship AI-powered features for real users in mature products.
• Ensure code quality, maintainability and test coverage.
• Contribute to architectural decisions and discussions.

Skills

Elixir

Backend development

AI features

Product thinking

Fluent English

Polish language

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)

Senior-level judgment: you have shipped enough to know when good enough is good enoughCommercial 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 ElixirInterest in building with AI: hands-on LLM or feature experience is a plus; curiosity and shipped experiments count tooProduct thinking: you push back on specs, evaluate trade-offs, prototype cheaply, and kill your own ideas when data says soFluent English; Polish is a plusExperience with TypeScript and Mastra (AI TypeScript framework) or strong willingness to learn it