Fullstack Developer

Fullstack Developer (F/H)

Department: Business Systems

Contract Type: Permanent (CDI)

Status: Managerial

City: Saint-Denis

Reference: 2026-3671

Project Context

Joining the Société des grands projets means becoming an actor in projects with significant environmental and societal impacts within an excellent project management framework. It means integrating a human-sized company where our 1000 employees make large mobility projects possible, transforming territories and facilitating residents' lives. What if you also put your talents to work for meaningful projects?

Mission and Activities

We are looking for a Fullstack Developer (F/H) for the Information Systems Department. You will report to the Head of the Development Hub within the Information Systems Department. Within an agile development team, your mission will be to design, develop, and evolve strategic business applications used daily by the Société des grands projets teams. Your mission will be to develop robust and scalable applications, from design to production, ensuring code quality, solution performance, and their alignment with user needs.

Your Missions

As such, your main activities will be:

• Analyze functional needs and design appropriate application solutions.
• Develop and maintain fullstack applications, contributing to technical choices.
• Ensure code quality through testing, code reviews, and continuous integration.
• Participate in the automation of deployments and the improvement of CI/CD pipelines.
• Identify, correct, and prevent anomalies and malfunctions.
• Document developments and application functionalities.

Context and Scope

You will work within the Information Systems Department, responsible for developing digital tools for major public transport projects. The applications developed support major challenges in steering, performance, and business transformation in a modern and collaborative technical environment.

Your Profile

Holding a Bac+5 degree (university or engineering school) or equivalent in IT development, you have proven experience in web application development.

The Skills Below Represent Your Strengths

• Mastery of fullstack web development.
• Practice with Symfony, API Platform, and NextJs frameworks.
• Good knowledge of relational databases and Linux environments.
• Sensitivity to good development practices and software quality.

What They Say About You

• Curious and rigorous.
• Comfortable in teamwork.
• Proactive and solution-oriented.

What Drives Us

At Société des grands projets, three collective values guide our daily actions:

• Together, because the success of our projects will be collective.
• Responsible, towards the residents of Île-de-France, public institutions, and the partners with whom we work.
• Demanding, in our daily work to ensure the operational excellence of our mobility projects for the benefit of the territories and with respect for the environment.

What We Offer You

• 2 days of remote work per week.
• 90% reimbursement of public transport passes in Île-de-France.
• Concierge service to facilitate your daily life.
• Gym with group classes.
• 90% reimbursement of mutual insurance (100% for employees recognized as having a disability).
• Financial aid for childcare and support for parenthood.
• Profit-sharing bonus.
• Employee savings plans.

At Société des grands projets, we are convinced that diversity is a richness that helps each of us grow. We strive to ensure an inclusive environment where everyone can be themselves, and to ensure ethical, fair, and open recruitment processes for all talents.

Key skills/competency

• Fullstack Development
• Symfony Framework
• API Platform
• NextJs
• Web Applications
• Agile Development
• CI/CD
• Database Management
• Linux Environments
• Software Quality