Senior Backend Engineer/Elixir - Appunite, Remote, Poland, Europe

Introductory paragraph

As a company, we are crazy about the possibilities of Elixir. Our portfolio boasts many projects that were successful thanks to Elixir. These projects provide real value to both the clients and the users, and don’t waste time compromising on performance problems. We sponsored this year’s ElixirConf 2026 in Málaga and ElixirConf 2025 in Kraków.

About us

My position: Recruitment Team
Company name: Appunite S.A
Company website: https://www.appunite.com
Company headquarters (country): Poland
Company info and history: Are you interested in Elixir and enjoy bringing Artificial Intelligence into your daily engineering work? We’ve been building with Elixir since 2015, contributing to its ecosystem and leveraging it to power high-scale, real-world systems.

About the job

Job title: Senior Backend Engineer/ Elixir

Job description:

5+ years of experience as a Backend Engineer in cross-functional, agile environments.
Strong engineering fundamentals and a track record of shipping production systems that are secure, reliable, and scalable.
Strong proficiency in Elixir for backend development.
Hands-on experience with Phoenix Framework, building robust and scalable services.
Solid SQL skills and experience with Postgres, including schema design and performance tuning.
Proficiency in REST API design and microservices architecture within cloud environments (preferably AWS).
CI/CD experience (GitLab, GitHub, Jenkins or similar).
Excellent communication skills in English (B2/C1) and Polish, with the ability to explain complex technical concepts to various stakeholders.

Nice to have:

Kubernetes, Docker, AWS.
Next.js, React / Vue / Angular.
Knowledge of Infrastructure as Code (Terraform/CloudFormation).
Ability to lead technical workshops or mentor junior developers.
Project Experience: Drives the success of major projects or multiple concurrent projects, providing strategic technical leadership. Often consulted for expertise on high-impact decisions.
Technical Skills: Possesses deep expertise across multiple technical areas and the ability to drive innovation within the team. Skilled at identifying and mitigating technical risks and ensuring the robustness of solutions.
Responsibilities: Provides technical leadership across projects, mentors other senior developers, and shapes the team’s technical direction and practices.

Salary range: 19,500 - 26,500 PLN net/month B2B
Qualifications or experience required: Pre-Senior/ Senior- depending on your skills

What the successful job applicant will be working on:

Design and maintain server-side applications with a focus on high availability and scalability.
Collaborate in a product trio, working closely with designers and product managers to ship impactful features.
Drive technical excellence by promoting best practices in code quality, security, and automated testing.
Proactively troubleshoot and optimize existing systems to ensure top-tier performance.
Stay curious – research emerging technologies and help us innovate our tech stack.
Practical experience designing or adopting agentic/automation workflows and improving them through iteration.
Ability to think in systems: define specs clearly, break down plans, instrument verification, and close the loop on quality.

Position on remote work

Remote job: Yes
Remote restrictions: Europe only
Remote leeway: Flexible working hours
Any other notes about your position on remote work: We also invite you to visit our office in Poznań

About the interview process

Video interview with our Recruitment Team (abt 45 minutes)
Competency interview with Team Representatives (abt. 60 minutes)
AI fluency assessment via AI CRED (aicred.ai) — a short online test measuring competency across 5 AI dimensions.
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.”