Senior Fullstack Software Engineer

• Bucharest, Romania

• Engineering

• Permanent - Full Time

Senior Fullstack Software Engineer

Job ID: r20494

What You'll Do:

🚀 Join Criteo as a Full Stack Software Engineer

At Criteo, we’re looking for Full Stack Software Engineers to join our Product Engineering team in our amazing Bucharest office (Piata Romana).

Are you passionate about building applications that make life easier for both developers and end users? Do you thrive in collaborative environments and enjoy tackling complex technical challenges? If so, you might be exactly who we’re looking for to help shape the future of our APIs.

💡 What You’ll Do

• Partner closely with Product teams, R&D colleagues, and our API Guild to design impactful, scalable APIs

• Collaborate with UI/UX experts to create intuitive and accessible user experiences

• Build and test reliable applications using unit, integration, and end-to-end testing

• Participate in code reviews to ensure high-quality, maintainable solutions

• Work within multicultural R&D teams to connect client-facing applications with the broader Criteo ecosystem

• Contribute to continuous deployment to keep our systems agile and responsive

• Bring in fresh ideas from meetups, conferences, and personal learning to improve our frameworks, testing practices, and CI/CD pipelines

🛠️ Our Tech Stack

• Back-end: C# / ASP.NET Core

• Front-end: Angular

🌍 Why Join Us?

• A collaborative, inclusive, and international work environment

• A global R&D community of 1000+ passionate engineers

• High-impact projects at the heart of innovation in AdTech

• A culture that values continuous learning, knowledge sharing, and growth

• Curious about our R&D team? Let's have a look at our R&D blog on Medium

Who You Are:

• You believe APIs are the backbone of modern technology.

• You care deeply about Developer Experience and want your work to empower other developers.

• You have at least 5 years of experience working on large, complex systems.

• You’re skilled in Object-Oriented Programming (C#, Python, C++, Java) with strong backend experience and some front-end development experience with JavaScript, Angular, or React.

• You love reusability and enjoy making complex things simple.

• You’re curious about new technologies and may even explore them through personal projects.

• You bring a positive, collaborative mindset and a “can-do” attitude to challenges.

• You thrive in Agile environments and are passionate about delivering high-quality code.

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!​

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.

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

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.