Senior and/or Staff Backend Software Engineer

We're building technology that operates at global scale, and we're doing it together.

By joining our R&D organization of more than 1,000 engineers, you'll be part of a diverse, international community that shares knowledge, challenges ideas, and continuously raises the bar for engineering excellence. At the same time, you'll work day to day within a small Product Engineering team (5–7 people), where ownership is real and your contributions directly shape one core component of our solution.

If you're excited by high-performance backend systems, low-latency constraints, and products that serve billions of requests every day, we'd love to meet you.

What you'll do

• Design, build, and evolve business-critical APIs, services, and backend components running at massive scale (up to 300 billion requests per day) with ultra-low latency requirements (responses under 30 ms).

• Take ownership of one key component of our product, from design and implementation to deployment and long-term evolution.

• Work closely with Product and Program Management to co-design robust architectures that meet both technical and business needs.

• Collaborate with multiple, multicultural R&D teams to ensure smooth integration between client-facing applications and the broader ecosystem.

• Continuously deploy your applications, leveraging modern CI/CD practices to ensure reliability, performance, and fast feedback loops.

• Actively contribute to a strong engineering culture rooted in craftsmanship, inclusion, and a passion for quality.

• By sharing insights from meetups, conferences, and the wider tech community, you'll help us adopt state-of-the-art frameworks, libraries, and best practices, from testing strategies to deployment and observability.

• You're a passionate backend engineer who loves low-latency, large-scale systems and enjoys connecting technical solutions to real product and business needs

• You have at least 6+ years of experience building and evolving complex systems in production

• You're comfortable with object-oriented programming, using languages like C#, Python, Java, C++, Scala (and similar ecosystems)

• You care about clean, reusable, and simple code, and you enjoy making complex things easier to understand

• You're curious and proactive, always happy to explore new technologies or lead small initiatives

• You bring a "can-do" mindset, love collaborating with others, and tackle challenges with optimism

• You're used to Agile environments and take pride in shipping high-quality, well-tested code

Recruitment process : What to expect?

Our recruitment process is designed to help you understand the role, meet the people you'll work with, and showcase your skills along the way :

• HR Interview – Get to know each other, align on expectations, and answer your questions

• Technical Screen (1h) – A short live coding exercise on CoderPad, focused on problem-solving

• In-depth Coding Interview (1h) – A deeper technical session to explore your approach, design choices, and coding skills, held on Corderpad

• System Design Interview (1h) – A collaborative discussion on scalable backend architectures, held on Zoom

• Final Interview – A behavioral, culture-focused conversation with senior team members (Zoom or onsite)

We acknowledge that many candidates may not meet every single role requirement listed above. If your experience looks a little different from our requirements but you believe that you can still bring value to the role, we'd love to see your application​

Criteo is a leader in commerce media, helping brands, agencies, and publishers create meaningful consumer connections through AI-powered advertising solutions. We're shaping a more open and sustainable digital future for advertising.  

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.  

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.  

Additional benefits may vary depending on the country where you work and the nature of your employment with Criteo.