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Full Stack Part Time

--Avenue Charles Schaller 52, 1160 Auderghem--

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Beautiful Sports is an organisation specialised in creating sporting events with a strong "added experience"and in developing passionate communities.

We organise competitions such as:

To support these experiences, we have developedour own competition management and gamification platform, used by:

  • sports event organisers to manage competitions

  • athletes to track rankings, results and their progress

  • communities to interact with competitions digitally

The application is based on amodern architecture :

  • Back-end: API in.NET (C#)
  • Front-end : Flutter(multi-platform – iOS, Android, Web)
  • Database: relational and optimised for managing large volumes of data (data-intensive).

This project is at the intersection ofsport,technologyanddata optimisation..

We are currently looking for asenior technical leader, very hands-on,to take charge of the technical direction and evolution of this platform. You will participate in the design and development in C#/.NET, API optimisation, and database management. You will also work on performance (algorithms, queries, scalability) and front/back collaboration (Flutter).

Role

We are looking for aSenior Full Stack / Technical Lead (.NET)who is:

  • extremely hands-on

  • comfortable working directly in the code

  • capable of taking responsibility for an existing system

  • able to move quickly using modern AI-assisted development practices

This role ispart-time or fractional, ideal for a senior engineer wishing to work closely with founders and a small team.

You will help us stabilise, simplify, and evolve our platform while significantly improving development speed through 'AI-native' engineering practices.

Your Mission

You will take on the technical leadership of the platform:

1. Understand and document the existing system

  • Take over the current backend in C#/.NET

  • Understand the logic of competition and gamification

  • Document the architecture and key flows

  • Reduce dependency on specific individuals

2. Finalise and stabilise the API powering the mobile application

  • Ensure a robust and scalable API

  • Support the launch of the Flutter application for athletes

  • Effectively fix bugs and edge cases

3. Improve development velocity

  • Reduce friction in development

  • Simplify architecture when necessary

  • Introduce pragmatic best practices

  • Enable rapid deployment of small features without regression

4. Introduce 'AI-native' development practices

In order to significantly increase the speed and quality of development, you will need to leverage tools such as:

  • LLM-based coding assistants

  • AI-assisted code review

  • AI-assisted debugging

  • AI-generated documentation

  • AI-generated tests

5. Act as a technical lead for external developers

  • Clarify technical direction

  • Review architectural decisions

  • Guide implementation

  • Ensure quality

Desired profile

Technical skills

Solid experience in:

  • C# / .NET backend development

  • API design and architecture

  • Debugging and maintenance of existing systems

  • Database design

  • Production systems

Bonus:

  • Experience with Flutter APIs

  • Experience with event-driven or gamification systems

  • Experience in sport-tech platforms

Leadership skills

You must be able to:

  • quickly take ownership of a system

  • simplify complexity

  • make pragmatic decisions

  • balance speed and quality

  • communicate clearly with non-technical founders

This is not a corporate role. We are looking for someone who enjoys writing code.

Bonus

  • interest in sports, cycling or football
  • experience with competition platforms
  • interest in gamification and athlete engagement

Flexible collaboration mode

Possible formats:

  • Tech Lead / Senior Engineer (part-time)

  • Freelance

Localisation : Belgique, remote-friendly.

Why this role?

  • take responsibility for a real product used by thousands of athletes

  • work directly with the founders

  • shape the technical future of a sports platform

  • experiment with AI-native development workflows

  • have strong autonomy and direct impact

How to apply?

Click the button below and share:

  • a short introduction

  • examples of systems you have taken over or improved

  • the AI tools you actively use in development

  • your preferred collaboration mode (fractional / freelance / part-time)

Apply Now!