Lead Infrastructure H/F - Flexcity

Location Colombelles

Contract Permanent position

Start July 2025

Flexcity is one of Europe's leading energy tech companies and part of the Veolia Group. Operating in France, Belgium, Spain, Italy, UK and the Netherlands, we aggregate and optimize thousands of flexible energy assets (batteries, industrial processes, renewables...) to support grid stability and drive the energy transition.

At Flexcity, Tech is not a support function - IT is a key business driver. We operate in a complex, real-time, and highly regulated environment, requiring robust, secure, and adaptable systems to manage the increasing volatility of energy markets.As Lead Infrastructure Engineer, you'll play a central role in shaping and maintaining our infrastructure landscape. You'll ensure our systems are secure, reliable, and ready to scale - enabling real-time control of hundreds of MWs across multiple markets.

Reporting directly to the CTO and working within a collaborative, multi-country team, you'll split your time across infrastructure architecture, team leadership, and DEVOPS enablement.

Infrastructure 60%
- Conceive, build, and maintain our hybrid infrastructure - currently based on AWS (ECS, EC2, RDS) with on-premise components, but with a planned migration to GCP in 2026.
- Guarantee availability, resilience, and security across our systems.
- Drive modernization : infrastructure-as-a-service, observability, automated failover, and scalability.

Team Leadership - 30%
- Lead and coach a team of two infrastructure engineers.
- Set clear goals, foster individual growth, and cultivate a positive team culture.
- Act as a bridge between infrastructure and the broader Tech organization.

DEVOPS best practices 10%
- Promote and embed DEVOPS practices (CI/CD, automated testing, monitoring).
- Collaborate closely with backend developers to streamline delivery pipelines.
- - Drive the adoption of infrastructure that enables faster, safer, and more reliable releases.

Key Qualifications

Hard Skills

Must-Have
- Proficient in cloud architecture (GCP preferred), networking, and system security.
- Strong Linux background, CI/CD tooling, containerization.
- Fluent in French (spoken and written), professional level in English

Nice-to-Have
- Knowledge of Pulumi, Kubernetes.
- Backend experience (Java/Kotlin a plus).

Soft Skills
- Proactitivity : Ability to improve our tech stacks.
- Improvement mentality : Passionate about continuous improvement and innovation.
- Team work spirit : Capability to collaborate with other teams