Lead Python Developer - Data Products (Plotly Dash)

About Us

At FDJ UNITED, we don't just follow the game, we reinvent it.

FDJ UNITED is one of Europe’s leading betting and gaming operators, with a vast portfolio of iconic brands and a reputation for technological excellence. With more than 5,000 employees and a presence in around fifteen regulated markets, the Group offers a diversified, responsible range of games, both under exclusive rights and open to competition. We set new standards, proving that entertainment and safety can go hand in hand. Here, you’ll work alongside a team of passionate individuals dedicated to delivering the best and safest entertaining experiences for our customers every day.

We’re looking for bold people who are eager to succeed and ready to level-up the game. If you thrive on innovation, embrace challenges, and want to make a real impact at all levels, FDJ UNITED is your playing field.

Join us in shaping the future of gaming. Are you ready to LEVEL-UP THE GAME?

About the role

We are looking for an experienced Python Developer to design, develop, and deploy our next generation of self-service data-visualization dashboards. Leveraging Plotly Dash, you will translate complex data into interactive, insight-driven products that empower users to make decisions independently. Working end-to-end—from data ingestion and modelling through UI design, deployment, and support—you'll set the standards for visual storytelling, ensuring every dashboard delivers clear, actionable insight.

Key Responsibilities

• Design, develop, and deploy production-grade interactive Dash applications
• Own the full data pipeline: from ingesting and transforming data with Pandas/SQL, to modelling and delivering insights through interactive visualizations
• Architect reusable Dash frameworks (layout templates, custom callbacks, component libraries, CI/CD, unit tests) to accelerate future development
• Optimise performance and scalability by writing efficient ClickHouse queries, profiling callback chains, minimising network traffic, and applying smart caching strategies to ensure fast and responsive dashboards
• Champion data-visualisation best practices: accessibility, colour theory, storytelling, responsiveness, and mobile-first design
• Deploy and monitor apps in cloud environments (Dash Enterprise/AWS)
• Collaborate with cross functional team to translate business questions into visual requirements and iterate quickly on feedback
• Mentor and upskill teammates, evangelising Dash/Plotly techniques and fostering a culture of self-service analytics
• Troubleshoot, debug, and document—use Dash's dev tools to diagnose callback errors, maintain clear README and user guides, and track KPIs for continual improvement

Skills and Experience You Will Bring

Essential Skills

• 5 + years professional Python development, with 2 + years delivering production Plotly Dash (or equivalent) dashboards
• Proven track record creating self-service, business-facing data products that drive measurable impact
• Experience writing optimized analytical queries and building data applications that remain fast and responsive, even when working with large and complex datasets
• Expert proficiency in Pandas, NumPy, and SQL (PostgreSQL, Snowflake, BigQuery, Clickhouse or similar)
• Strong grasp of data-visualisation principles, UX best practices and how to translate complex data into intuitive, interactive interfaces
• Experience setting up automated testing, containerisation (Docker), and CI/CD for Dash applications
• Comfortable working autonomously—able to prioritise, plan, and deliver with minimal oversight
• Clear communicator able to translate technical concepts into non-technical language

Soft Skills

• Strategic thinker with strong problem-solving ability and business acumen.
• Proactive collaborator who thrives in fast-paced, iterative environments.
• Comfortable with ambiguity; able to balance experimentation with reliable delivery.

Ensure that you, and your team, adhere to the Governance, Risk & Compliance (GRC) obligations within your direct responsibility and control. Ensure any non-compliance incidents within your team are raised through the appropriate channels (Compliance Incidents Process) and that your team are informed of any reporting processes relevant to them. Challenge processes, policies and projects that will negatively impact compliance within the Group. Ensure your team's completion of all mandatory compliance trainings within the set deadline. Reach out to the Compliance Teams if unsure of any of your compliance obligations or the requirements are unclear.

Our Way Of Working

Our world is hybrid.

A career is not a sprint. It’s a marathon. One of the perks of joining us is that we value you as a person first. Our hybrid world allows you to focus on your goals and responsibilities and lets you self-organise to improve your deliveries and get the work done in your own way.

Application Process

We believe talent knows no boundaries. Our hiring process focuses solely on your skills, experience, and potential to contribute to our team. We welcome applicants from all backgrounds and evaluate each candidate based on merit, regardless of personal characteristics as the age, gender, origin, religion, sexual orientation, neurodiversity or disability.