Senior Backend Developer

About the Position

Senior Backend Developer

Location: Bucharest, Romania

Department: Engineering

Employment Type: Permanent - Full Time

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Responsibilities

As a Software Engineer in the Commerce Properties team at Criteo, you’ll shape how companies integrate their e-commerce properties with Criteo. You’ll evolve our real-time events ingestion back-end with a focus on scalability, low latency, and reliability, and you’ll help imagine, design, and implement user flows that reduce client integration time by leveraging AI for guided setup, auto-validation, and just-in-time assistance.

• Build new capabilities and maintain our high-throughput events collection back-end, one of Criteo’s largest data pipelines by volume.
• Partner with Product and Program to deliver fit-for-purpose architecture and reusable components across platforms.
• Design, implement, and ship back-end features end-to-end with strong testing and observability.
• Help build web applications when needed, including AI-assisted flows for configuration, validation, and troubleshooting.
• Collaborate with multi-cultural R&D teams and Internal IT to ensure robust integrations between client-facing apps and Criteo systems.
• Own stability, usability, and continuous delivery, raising the bar on reliability and developer experience.
• Promote a strong engineering culture focused on quality, testing, and modern CI/CD; bring insights from meetups and conferences to keep our stack state-of-the-art.

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Requirements

• Experience building, maintaining, and evolving large-scale applications.
• Deep care for high-throughput systems and prioritizing reliability, performance, and scalability in your work.
• Skilled at making complex problems simple and solvable.
• Curious about new technologies and adopting proven design and engineering best practices.
• Can-do, collaborative mindset and approach problems with positivity and ownership.
• Experience in Agile teams and passionate about shipping high-quality, well-tested code.

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Nice to Have

• Experience in full-stack development with modern JavaScript and in building web services in C#, Java, or Python.
• Contribute to Product and UX discussions, turning customer needs into simple, intuitive solutions, and applying AI where it clearly improves outcomes.

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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.

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About the Company

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.