• Build and ship platform capabilities: Design and implement infrastructure-as-code, internal tooling, and shared services (Node.js, Java, Python) that product engineering teams build on - writing clean, well-tested, scalable code

• Contribute to technical design: Author design documents, participate in design reviews, and propose trade-offs on architecture, security, and reliability with guidance from senior and staff engineers

• Deliver quality through testing: Write unit, integration, and end-to-end tests; build and harden CI/CD pipelines and code review standards for the broader engineering organization

• Strengthen DevSecOps practices: Embed security controls into the pipeline (vulnerability scanning, secrets management, policy-as-code), and develop secure, performant APIs and automation for infrastructure provisioning

• Enable product teams to run on-call: Build the observability, alerting frameworks, runbooks, and self-service tooling (e.g., DataDog, Grafana) that product engineering teams use to monitor and operate their own services

• Own platform reliability: Join on-call rotations for the platform and tooling layer itself, and drive root cause analysis and remediation for platform-level incidents

• Grow yourself and others: Share knowledge through reviews, documentation, and demos; support junior engineers

• Experience: 5+ years building and operating production infrastructure, platform services, or DevOps systems, with increasing scope and independence; cross-functional team experience (B2B or regulated industries a plus)

• Technical skills: JavaScript/TypeScript (Node.js) plus an OOP language (Java, Python, C++); Infrastructure as Code (Terraform); container orchestration (Kubernetes, Docker); hands-on cloud experience (AWS, GCP, or Azure); CI/CD pipeline engineering; observability and monitoring tools (DataDog, Grafana); SQL/NoSQL. Security tooling (SAST/DAST, secrets management), networking fundamentals (DNS, TLS/certificates, load balancing, CDN/WAF, VPC/connectivity), and SAP/Salesforce Commerce Cloud infrastructure experience are a plus.

• Soft skills: Strong ownership mentality, pragmatic problem-solver, effective communicator who builds trust across teams, curious and growth-oriented

• Education: Computer Science, Engineering, or equivalent practical experience

Sanofi’s Global eCommerce organization is building the digital infrastructure that connects healthcare professionals, institutions, and patients to our portfolio of life-changing medicines. As a Software Development Engineer III on our Platform Engineering team, you’ll design, build, and operate the shared infrastructure, CI/CD pipelines, and observability tooling that power digital commerce experiences across multiple geographies and customer segments.

This is a high-impact individual contributor role where you’ll own well-scoped platform capabilities end to end - from design to deployment - while growing your independence alongside senior engineers. You’ll work closely with product engineering teams, Security, and Operations on systems where reliability, resilience, and operational excellence directly affect our ability to deliver medicines to patients worldwide.

About Sanofi

Sanofi is dedicated to supporting people through their health challenges. We are a global biopharmaceutical company focused on human health, committed to chasing the miracles of science to improve people’s lives. Our team, across some 100 countries, is dedicated to transforming the practice of medicine by working to turn the impossible into the possible. We provide potentially life-changing treatment options and life-saving vaccine protection to millions of people globally, while putting sustainability and social responsibility at the center of our ambitions.

At Sanofi, we believe our people are our greatest strength, and we are committed to creating an inclusive environment where diverse perspectives drive innovation. Our values - Aim Higher, Act for Patients, Be Bold, and Lead Together - guide everything we do, * Real-world impact - help ensure the stability and security of the platforms that deliver life-changing medicines to patients across dozens of markets

• Meaningful challenges - tackle complex, high-scale reliability and security problems at the intersection of healthcare and digital commerce

• Great company - collaborate with talented platform engineers, security experts, and product engineering teams in a global, mission-driven organization

• Great package - competitive compensation and hybrid flexibility

• Room to grow - a culture that invests in your continuous development

• Bold mission - join a team chasing the miracles of science with curiosity and inclusion at its core

Pursue Progress. Discover Extraordinary.

Join Sanofi and step into a new era of science - where your growth can be just as transformative as the work we do. We invest in you to reach further, think faster, and do what’s never-been-done-before. You’ll help push boundaries, challenge convention, and build smarter solutions that reach the communities we serve. Ready to chase the miracles of science and improve people’s lives? Let’s Pursue Progress and Discover Extraordinary - together.

At Sanofi, we provide equal opportunities to all regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, protected veteran status or other characteristics protected by law.

LI-Hybrid #BarcelonaHub #SanofiHubs, Better is out there. Better medications, better outcomes, better science. But progress doesn’t happen without people - people from different backgrounds, in different locations, doing different roles, all united by one thing: a desire to make miracles happen. So, let’s be those people.

At Sanofi, we provide equal opportunities to all regardless of race, colour, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, ability or gender identity.

Watch our ALL IN video and check out our Diversity Equity and Inclusion actions at sanofi.com!

The salary range for this position is :€49.600,00 - €74.400,00