Senior Site Reliability Engineer | Platform Engineering & Developer Experience

• Bucharest, Romania

• Engineering

• Permanent - Full Time

Job ID: r20798

What You'll Do:

The Platform Factory group empowers Criteo engineers to code, build, test, deploy, faster, safer, and smarter.

Within Platform Factory, the Codex (Code & Development Experience) team builds and operates the coding platform of every engineer at Criteo. From containerized development environments in local and remote modes to code management with hosting, review, search, and ownership, all AI-powered, the team provides the services and tools that enable engineers during their very first steps in their software development life cycle efficiently and at scale.

As a Senior Site Reliability Engineer, you'll help shape the future of software development at Criteo by building highly reliable platforms, improving developer productivity, and enabling modern engineering practices.

Build and Operate Developer Platforms

• Design, build, and evolve the platform that powers software development across Criteo.
• Operate and improve critical systems including source code management and remote development environments.
• Ensure reliability, scalability, security, and performance for services used daily by engineering teams worldwide.
• Support the adoption of modern developer workflows and AI-assisted development tools.

Automation & Platform Engineering

• Develop platform services, APIs, and integrations that simplify software development and delivery.
• Build automation and self-service capabilities that allow engineering teams to move faster while maintaining high operational standards.
• Improve integrations with CI/CD and other internal platforms.
• Contribute to the evolution of our Containerized and Kubernetes-based infrastructure.

Reliability & Continuous Improvement

• Own the full reliability lifecycle of the platforms you support: monitoring, incident response, troubleshooting, root cause analysis, and long-term remediation.
• Define and implement best practices around observability, automation, capacity planning, and platform security.
• Continuously reduce operational toil through engineering and automation.
• Drive platform modernization initiatives and technical improvements.

Collaboration & Technical Leadership

• Partner closely with software engineers, ML engineers, data scientists, and platform teams to improve the overall developer experience.
• Contribute to technical strategy and architectural decisions.
• Share knowledge, mentor peers, and help define engineering best practices.
• Document systems and processes to improve platform adoption and operational excellence.

Why Join Us?

Every line of code written at Criteo starts its journey through the Codex team’s services. You'll have a direct impact on the daily experience of hundreds of engineers while helping shape the future of developer productivity through our platforms, automation, and AI-assisted development.

Who You Are:

Technical Background

• Master's degree in computer science or equivalent experience.
• 5+ years of experience in SRE, Platform Engineering, DevOps, Software Engineering, or distributed systems.
• Strong software development skills in Go, Python, C#, Ruby, or similar languages.
• Solid understanding of distributed systems, cloud infrastructure, APIs, scalability, reliability, and software engineering best practices.
• Experience building or operating large-scale engineering platforms or infrastructure services.
• Power user on AI-assisted development practices.

Infrastructure & Operations

• Strong experience with Linux server environments.
• Hands-on experience with containers and orchestration technologies such as Kubernetes.
• Familiarity with CI/CD, infrastructure-as-code, and automation practices.
• Experience operating developer platforms, source code management systems.
• Passion for automation, observability, reliability, and reducing operational complexity.

Nice to Have

• Experience with Gerrit or Gitlab administration and operations.
• Familiarity with developer productivity platforms, remote development environments, or AI coding assistants.
• Experience supporting large engineering organizations.

Soft Skills

• Excellent communication and collaboration skills.
• Strong ownership mindset and problem-solving abilities.
• Passion for improving developer productivity and engineering efficiency.
• Comfortable operating critical platforms at scale.
• Willingness to participate in the team's on-call rotation.

Who We Are:

We’re Criteo, the Commerce Intelligence Platform. Criteo helps businesses turn shopper signals into commerce outcomes while delivering more relevant experiences for shoppers. We use proprietary commerce intelligence and AI decisioning to drive relevance for shoppers and performance for businesses.

At Criteo, our culture is as unique as it is diverse. From our offices across the globe or from the comfort of home, our 3,600 Criteos collaborate together to build an open, impactful, and forward-thinking environment.

We foster a workplace where everyone is valued, and employment decisions are based solely on skills, qualifications, and business needs—never on non-job-related factors or legally protected characteristics.

What We Offer:

• 🏢 Ways of working – Our hybrid model blends home with in-office experiences, making space for both.
• 📈 Grow with us – Learning, mentorship & career development programs.
• 💪 Your wellbeing matters – Health benefits, wellness perks & mental health support.
• 🤝 A team that cares – Diverse, inclusive, and globally connected.
• 💸 Fair pay & perks – Attractive salary, with performance-based rewards and family-friendly policies, plus the potential for equity depending on role and level.

Perks & Benefits for all Criteos.

Happy people make healthy teams, so we value employee well-being above all else. Discover the perks & benefits we offer all our Criteos!!

Ways of Working

Trust and flexibility are at our core, so is the power of being together. Our hybrid model blends empowerment with shared in-person experiences, making space for both. We believe this is the most valuable way to foster collaboration in a way that helps us grow, together.

Learning & Career Development

As your skills multiply, opportunities do too. So, we care to help you nurture your potential, identify new goals, and define what you want out of your career. Discover how we have diversified our learning resources and training catalog for you to shape greater opportunities. You care for your career growth, and we do too.

Corporate Social Responsibility

We care to build an open future for our community and beyond. Discover how our people fuel our Corporate Social Responsibility from the bottom up, embracing but also embodying and promoting values of diversity, equity, and inclusion through everything they do. Together, we strive to build a future that truly includes everyone.

Great people shape greater opportunities.

At Criteo, we believe great people and reliable products are essential to build an open future for all.

Everything you need to know about our culture, vision, values, and how we live them with people, both in and out of Criteo, is in our Culture Book. Discover who we are, what we do, and how we act as a company and as Criteos!

The Future is Yours.