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Senior Backend Engineer with Elixir (AI / LLM)

Appunite
Poznan, województwo wielkopolskie
Full time
1 dzień temu

About the project

We’re building a platform that supports a SaaS application for large enterprises to facilitate strategic management processes. The product is designed to be highly interactive, communication-focused, and deliver measurable business value at scale.

You’ll work closely with the client - aligning priorities, presenting progress, and shaping technical direction. You’ll have autonomy over implementation details and will be included in decision-making.

This is a fast-evolving product that bridges the worlds of Artificial Intelligence and scalable infrastructure.

Sound like a good fit?

We’re not looking for perfection – we’re looking for people who love to solve real problems, stay curious, and want to build something meaningful with autonomy and trust.

Let’s talk!

Salary: 18,000-22,500 PLN net/month B2B


You’ll be a great fit if you:

  • 4+ years of experience as a Backend Developer

  • Solid knowledge of Elixir and its ecosystem:

    • knowledge about BEAM VM, clustering, message passing

    • familiarity with tools: ecto, exunit, phoenix, ETS

    • OTP knowledge

      • GenServer,

      • Supervisors,

    • Oban / Oban Pro,

  • Experience with:

    • PostgreSQL,

    • GraphQL (Absinthe),

    • Multi-tenant architectures,

  • Knowledge of Python, which is used to integrate our AI-core with the Elixir core.

  • Ability to write clear technical documentation.

  • Comfortable with direct client communication (daily syncs, demos, feedback).

  • Fluent Polish (internal team communication) and English (client communication).

  • Proactive, ownership-driven attitude and strong collaboration skills.

Nice to have:

  • Experience with AI tooling or LLM frameworks:

    • LangGraph,

    • Pydantic AI,

    • LlamaIndex.

  • Knowledge of:

    • Graph databases (RDF with Turtle format),

    • Elixir LiveBooks,

    • Data pipelines, channels, websockets, and real-time applications.

  • DevOps fundamentals -Terraform and AWS.

  • Open to learning new languages that might play nicely with Elixir (Rustler / Zigler).

What we offer:

  • Space to grow and share your solutions- - we’re not into one methodology or tactic!

  • Budget for tools & learning, plus regular check-ins and mentorship

  • Open, feedback-driven culture with lots of transparency

  • Real impact on how the company works and what we build next

  • Knowledge about business - creating and analysing decisions, strategic support

  • No tasks - only real problems to solve

  • You decide how to organize your work

  • Opportunity to work with AI, LLMs, and agent-based architectures in Elixir

  • Flexibility: hours, form of employment, and pace of learning

  • Regular team trips to the client in Northern Europe (every 1–2 months)

  • Full ownership and autonomy in your work

  • Impact beyond code: you'll help shape product and business direction

  • Open and transparent feedback culture

Our recruitment process is only 3 steps long:

  • Culture&mission fit meeting with Recruitment Team (abt 60 minutes)

  • Video interview - Live coding with our AI & Backend Team (abt 90 minutes)

  • Video interview with the client (abt 60 minutes)

  • If any other step of the recruitment process is necessary, we will inform you!

  • And finally, the decision, after which we can say “welcome on board.”

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