Developer Full Stack

Requisition ID:  5426


About US (GEMS)

ENGIE Global Energy Management & Sales (GEMS) provides energy supply solutions and risk management services to support its clients through their decarbonization journey, while optimizing ENGIE’s assets and contributing to value creation.

ENGIE is a global reference in low-carbon energy and services with a leading energy management business, piloted by its entity "Global Energy Management & Sales" who built its savoir-faire managing the Group’s large and diverse asset portfolio over 20+ years.

3,300 employees around the world develop our solutions, through +20 international business platforms. We cover the full energy mix: renewable and thermal power, natural gas & LNG, biomass, environmental products. Our experts provide tailor made solutions based on a wide range of savoir-faire in energy management with a strong focus on decarbonation and decentralization.

Our +120,000 clients span the entire value chain: producers, asset developers, financial players, utilities, distributors and industrials. Our global reach and strong local presence enable us to offer these diverse clients tailor-made services and respond to rapid changes in mature or emerging markets alike.

Our 4 expertises:

· Asset management

· Energy transition services

· Energy supply & global commodities

· Risk management & market access

At GEMS we encourage breakthrough results, team spirit, curiosity and innovation while preserving the right work/life balance for you. More info on GEM Hub ( or LinkedIn (


You will become a member of the Common Application Development team within the expertise center IS (EC IS) in Brussels. The mission of our team is to develop and maintain applications for the transversal functions in the business like HR, communication, purchase or IS itself. The complexity in our work comes from the application landscape with many integrations between applications. The challenge is to keep these stable and to grow and extend at the same time. Part of the team is located in Paris while the other part is located in Brussels. We look for an Experienced Full Stack developer and technical lead to enforce our team. Today, our team in Brussels consist of 3 project leaders, 4 .NET developers and 2 ServiceNow developers.

Your contribution


We look for a developer .NET, routined in writing maintainable code and you apply best practices in your code as a second nature. You want to break out of the daily coding routine and open up to share your experience and knowledge with your colleagues. You understand that only as a team we can win but you are not afraid to be challenged nor to challenge. Not afraid to learn new concepts and apply older framework as well. In that sense, from SQL query language over Angular to Azure, you know how to spice your dish and be a full stack developer. Short, targeted assignments give you energy while larger projects allows you to show your vision.

If this is you, we are looking for you to enforce our team!


50% Tech referent - 50% full stack developer

Key missions

As Tech referent:

· Act as sounding board for colleagues on development approaches, code quality and methodologies

· In collaboration with architect propose application landscapes

· Perform pull request reviews to ensure code quality

· Propose technical evolutions on the landscapes to assure an up to date code base

· Identify technological depth and provide the migration path

· Continuous improvement and technology watch

As developer:

· Interact with business to understand the needs

· Capture the need in User Stories

· Estimate the steps and for each step the workload it takes to realize

· Participate in agile ceremonies

· Development (and Unit Testing) and documentation

· Report the progress of your tasks on a weekly basis

· Ensure deliveries and respect deadlines

· Provide support in operational mode


Daytrips to the headquarter in Paris are possible

About YOU

Hard skills

Must have:

· 5-10 years and up to date .Net (7) experience

· 5 years and up to date Typescript/javascript/Angular(14) experience

· 5 years SQL Server experience – from queries to stored procedures.

· 2 years Azure Cloud – know how to navigate in the cloud

· API’s are the way you like to exchange

· Git - Branche/Pull request


· Unit testing frameworks

Good to have:

· You understood Test methodologies (TDD,BDD/ATDD) before you could speak

· You applied Common design patterns before you could walk

· You touched on technologies like

o Postgresql

o Splunk

o Powershell

· Data lake technologies are not a complete unknown

Nice to have:

· Know to navigate in Azure DevOps

· Not afraid to handle some Python code from time to time

Soft skills

Must have:

· Wanting more and searching for more

· Professional programmer reflexes

· See and set points of improvement in technical landscapes.

· Good interpersonal skills (listen, empathy,...)

· Teamplayer - Willing to support/develop other developers

· Open-minded

Good to have:

· Understand non-IT people

Education and professional background

Engineer / Master in Information Systems


· English (work language)

· French/Dutch: optional



Our group is a global reference in low-carbon energy and services. Our purpose (“raison d’être”) is to act to accelerate the transition towards a carbon-neutral world, through reduced energy consumption and more environmentally-friendly solutions, reconciling economic performance with a positive impact on people and the planet. We rely on our key businesses (gas, renewable energy, services) to offer competitive solutions to our customers. With our 170,000 employees, our customers, partners and stakeholders, we are a community of Imaginative Builders, committed every day to more harmonious progress.

Business Unit:  GEMS
Division:  GEMS - EC IS
Contract Type:  Permanent
Job Type: 
Professional Experience:  Skilled ( >3 experience <15 years)
Education Level:  Master's Degree