Back-end Elixir developer
First seen by Alion on Nov 13, 2026.
At Demcon Johan Sports, we build technology that helps sports teams - from premier league to amateur league - improve performance and prevent injuries. Our wearables, mobile apps and dashboards translate sports data into actionable insights. Smart, scalable and reliable. And that's exactly where you come in. We are looking for a back-end engineer with Elixir skills as well as a solid basis as a software engineer. Someone who can oversee systems, make choices and actively help build the future of sports technology.
- Back-end Elixir developer — Medior
- Delft
About Demcon
Demcon johan sports is a developer of GPS tracking systems for monitoring the health and improving the performance of sports teams.
What are you going to do?
As a back-end engineer, you will work on the core of our platform. You will develop and maintain infrastructure that:
- Processes and enriches real-time sports data
- Unlocks APIs towards mobile, web and internal tools
- Synchronises with partner platforms and downstream systems
- Calculates metrics such as sprint distance or intensity based on personal thresholds
- Ensures security, scalability and performance - without concessions
You will interact with firmware, front-end, data science and business. And you get the space to use your experience in designing, building and improving our systems - from architecture to monitoring.
Among other things, you will work on
- Data pipelines for wearable & subjective input
- APIs for our apps (live monitoring, analytics, mobile)
- Back-office tools (firmware management, hardware status)
- External API integrations (data sync with partners)
- Cloud infrastructure and logging/monitoring of our services
We build in Elixir, but also use Python, React.js, and run in a cloud-native environment with Docker and serverless components, among others.
What do you bring to the table?
- 5+ years' experience as a software engineer in a professional environment
- At least 2 years of experience with Elixir (or similar functional language)
- Experience designing APIs and scalable back-end structures
In addition, you enjoy collaborating on-site in Eindhoven or Delft with other disciplines, think across systems and are keen on clean code, security, testing and observability.
What do we offer you?
At Demcon, you will work on technically challenging projects where your experience directly contributes to the quality of our solutions. You will have the opportunity to help shape software decisions, provide technical guidance to colleagues, and contribute to the further development of our standard platforms, including BRIX.
We also value a pleasant working environment, personal attention, and a healthy work-life balance. We actively discourage overtime because we understand how important life outside of work is.
In addition, you can expect:
- A competitive salary;
- 31 days of paid leave and an 8% holiday allowance;
- A good pension scheme with Zwitserleven;
- Opportunities to follow training courses and professional development programs through the Demcon Academy, allowing you to further develop your knowledge and skills;
- A company laptop and phone;
- A bicycle scheme;
- An active staff association, with monthly activities such as social drinks and an annual Demcon weekend, as well as annual sporting events.