Developer – Gas Flow Management (GFM)
About Fluxys
Fluxys is an independent energy infrastructure group headquartered in Belgium, with
operations across Europe, the Middle East, and South America. We specialize in gas
transmission, storage, and LNG terminalling, managing over 28,000 km of pipeline
infrastructure and terminals capable of regasifying 485 TWh annually.
As a key player in the energy transition, Fluxys is committed to enabling the shift toward
carbon neutrality—transporting natural gas today while preparing infrastructure for
hydrogen, biomethane, CO₂, and other low-carbon energy carriers of tomorrow.
About the role
As a Developer for a Gas Flow Management (GFM) product, you will be part of a cross-
functional, agile team responsible for the design, development, and continuous
enhancement of digital solutions supporting Fluxys' commercial operations.
The applications you help build and maintain span the entire gas flow management
lifecycle—covering customer onboarding, contracting, demand processing, flow planning,
network balancing, billing, invoicing, data publication, reporting, and business-to-business
messaging. These tools support our core infrastructure activities—transmission, storage,
and terminalling—and serve multiple European Transmission System Operators (TSOs), both
within and outside the Fluxys Group.
You will help deliver end-to-end software solutions that are robust, scalable, and tightly
aligned with user needs and business goals. You’ll be empowered to shape features,
improve system architecture, and contribute meaningfully to a long-lived product that
evolves with the energy sector’s rapid transformation.
Key Responsibilities
 Design and develop high-quality, maintainable software components within the
Fluxys product ecosystem
 Collaborate closely with product owners, business analysts, and business
stakeholders to translate real-world challenges into digital solutions
 Contribute to architectural discussions and propose improvements that enhance
performance, reliability, and maintainability
 Implement and maintain tests and participate in testing activities
 Review code, mentor peers, and uphold coding standards within the teams
 Contribute to release preparation, including technical documentation and
deployment activities
 Support user acceptance testing (UAT), actively participate in demo sessions, and
ensure clear, reliable documentation to help users adopt the product
 Handle functional and technical service requests from business stakeholders,
providing timely and effective support

 Collaborate with the product team to investigate and resolve incidents, ensuring
minimal impact on operations
 Participate in monitoring and troubleshoot issues across development, testing, and
production environments
 Actively engage in Agile ceremonies: backlog refinement, sprint planning, reviews,
retrospectives, and daily stand-ups
 Help create technical items on the product backlog, phrase them in a value-oriented
manner understandable by business stakeholders, and support the product owner to
prioritize these according to value delivered
Skills & Competencies
 Affinity with the technical stack used by the team:
o Backend: .NET 8 / .NET Framework, ASP.NET Web API, WCF
o Data & Messaging: SQL Server, Oracle, RabbitMQ, NHibernate, Entity
Framework
o Architecture & Patterns: Domain-Driven Design (DDD), Clean Architecture,
Design Patterns
o Testing & CI/CD: xUnit / NUnit, Azure DevOps Pipelines
o Frontend: Blazor experience is a plus
o DevOps & Tools: Git, Azure DevOps, automated deployment & monitoring
tools

 Strong grasp of software design principles, clean coding practices, and architectural
thinking
 Experience working with complex systems and maintaining large codebases over
time
 Familiarity with modern testing strategies and CI/CD processes
 Ability to engage with both technical and business stakeholders fluently
 Fluency in Portuguese and in English; knowledge of either French or Dutch is a plus
Mindset We Value
 Product-Focused : You understand that success means delivering real value to users
and the business, not just completing tasks. You stay aligned with product goals and
customer outcomes.
 Collaborative by Nature : You thrive in cross-functional teams, communicate openly,
and believe the best solutions come from shared thinking and mutual respect.
 Curious and Proactive : You ask questions, explore beyond the obvious, and
challenge the status quo to continuously improve how we work and what we deliver.
 Adaptable and Resilient : You embrace change, stay flexible under shifting priorities,
and help others navigate uncertainty with a positive mindset.
 Committed to Quality : You take pride in delivering thoughtful, reliable work. You
aim for sustainable outcomes and long-term impact, not just quick fixes.
 Transparent and Accountable : You bring visibility to your progress and blockers,
take ownership of your responsibilities, and help foster trust across the team.

 Continuous Learner : You stay curious about technology, the energy sector, and
modern ways of working—and you’re eager to grow alongside the team and the
product.
Practical
 Place of mission: Fluxys Byte it Headquarters – Av. Duque D'ávila, Nº46, 4º C 1050-
083 Lisboa
 Onsite presence required 2 days/week, remainder in homeworking
 The start date of this mission is as soon as possible