Stagiaire - Modélisation et Monitoring de l'impact du Cloud (F/H)

Worldline, a payments technology company helping businesses grow securely, is looking for an intern to join the team onsite in Noyelles Les Seclin, 59, FR. The company positions itself as an innovator at the heart of payments tech, shaping how the world pays and gets paid. This internship is a chance to work with teams focused on sustainability and cloud infrastructure, in a global, collaborative environment.

The role centers on strengthening the monitoring of environmental impact for services hosted on Worldline’s internal cloud. The goal is to make how much infrastructure, services and projects consume energy more visible, understandable and usable by the teams. Starting from real electricity data from physical servers, you’ll model the consumption of virtual machines and then of the projects that rely on them, helping teams better understand the energy footprint of their services and steer eco-friendly design choices.

It’s a fit for curious, autonomous students who want to grow in an innovative setting and contribute to a greener digital world, all while gaining hands-on experience with cloud monitoring and data-driven sustainability insights.

Turning data into greener cloud realities

In this internship you’ll join an agile, international team and explore technical options that promote eco-design across digital services. You’ll work with real-world data and strive to translate complex energy metrics into practical, actionable insights for stakeholders. The work will involve applying modern tools and architectures, including web and backend technologies and CI/CD practices, to build transparent indicators and visualizations that make environmental impact easier to read.

As you model energy consumption at the level of services, you’ll document your assumptions and identify the limits of your approach. You’ll contribute to upgrading the cloud dashboard so that consumptions and indicators are more precise and usable by clients, and you’ll help extend dashboards to other Worldline hosting environments through your modelling work. Communicating with the relevant teams to understand their needs and present your results will be part of your day-to-day.

What the role requires and what helps you stand out

Must-have requirements

• you’re pursuing a Master’s or equivalent in engineering, business, or a university program, with a specialization in Sustainable Development and CSR
• you enjoy analyzing data and building models to describe how systems behave
• you have experience with object-oriented programming (Java or similar) and web development (TypeScript/React), and you know SQL basics and REST API design; familiarity with Git and Docker is a plus
• you understand virtualization, cloud computing, or IT infrastructure concepts
• you can explain technical results to non-technical audiences
• you’re drawn to Green IT, eco-design, and measuring the environmental footprint of digital services
• you’re curious, eager to learn, and able to work independently
• you communicate well and collaborate in a team, and you’re comfortable in an international setting where English is used

Nice-to-haves

• previous exposure to technologies such as Quarkus or Spring, MongoDB, or data visualization tools
• knowledge of FinOps or experience measuring the digital footprint with metrics like ACV, PUE, or carbon intensity
• an openness to experimenting with new tech like ClickHouse, Temporal, Kafka/Debezium, OpenTelemetry, Terraform and Go during the internship

Compensation, perks and practical details

The internship comes with a monthly stipend and the chance to work at the heart of Worldline’s payments technology. In addition to the monetary reward, there is support for commuting costs up to 75% of public transport expenses, a subsidized company restaurant, access to a ticketing program, and a pathway to ongoing professional development through an e-learning platform. The internship can last up to six months, and the role is onsite in France.

Advice for applicants who want to stand out

Lead your resume with a project or coursework that links sustainability with data modelling or cloud infrastructure. If you’ve worked on a dashboard, a reporting tool, or an energy-use analysis, put that front and center and describe the impact in measurable terms.

When you talk about must-have skills, show concrete evidence of how you’ve used Java or a similar OO language, built a small web or API project with TypeScript/React, and how you’ve structured SQL queries and REST endpoints. If you have Git history or a Docker image that demonstrates your workflow, mention it and be ready to discuss it.

Prepare to explain your approach to turning raw consumption data into clear indicators. You might be asked to walk through a hypothetical model, discuss its assumptions, and outline its limits or potential biases. Practice a short demo of how you’d visualize energy data for a cross-functional audience.

Think of one thoughtful question to ask at the end of your interview, such as how the team prioritizes which dashboards to extend across other Worldline hosting environments or how your modelling work could influence eco-design decisions in practice.