Senior Software Development Engineer

Criteo; Paris; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Health benefits

Wellness programs

Mental health support

Equity opportunities

Job summary

Criteo is seeking a Software Development Engineer to help build and evolve the identity infrastructure powering user understanding across devices and environments. You will design, develop, and operate scalable backend services, contributing to the Identity Graph and cross-environment matching.

You will collaborate with product managers, data scientists, and ML engineers in an Agile environment, ensuring high-quality code and privacy-conscious identity solutions.

Qualifications

• At least 5 years of experience developing and extending large and complex systems.
• Master in Computer Science or Engineering or related field is required.
• Fluent in English and able to work in an English-speaking environment.
• Experience in Agile environments and delivering high-quality code.

Responsibilities

• Design, build, and operate scalable backend services processing billions of identity signals.
• Contribute to the Identity Graph connecting cookies, identifiers, and signals.
• Develop services to create, store, enrich, synchronize, validate, and serve identity data.
• Improve cross-device and cross-environment matching for wider audience reach.
• Work on large-scale data processing, distributed systems, and low-latency APIs.
• Collaborate with product managers, data scientists, ML engineers, and other teams.
• Contribute to privacy-conscious identity solutions in a changing advertising landscape.
• Own services end-to-end from design through deployment and monitoring.

Skills

Large-scale systems

English (Fluent)

Agile methodologies

Collaborative mindset

Education

Master's degree in Computer Science or Engineering

Tools

C#

Python

C++

Java

Job description

What You'll Do:

As a Software Development Engineer in the IPI ID Graph team, you will help build and evolve the identity infrastructure that powers Criteo's understanding of users across devices, browsers, apps, and online/offline environments. The team develops large-scale distributed systems that connect identity signals and make them available to critical advertising, measurement, audience, and personalisation products across Criteo.

• Design, build, and operate highly scalable backend services that process billions of identity signals.
• Contribute to Criteo's Identity Graph, which connects browser cookies, mobile identifiers, hashed emails, CRM identifiers, and other signals into a unified view of users.
• Develop services that create, store, enrich, synchronize, validate, and serve identity data across Criteo's ecosystem.
• Improve cross-device and cross-environment matching capabilities to increase audience reach and advertising performance.
• Work on large-scale data processing, distributed systems, low-latency services, and high-throughput APIs.
• Partner closely with product managers, data scientists, machine learning engineers, and other engineering teams across User Data and Audience platforms.
• Contribute to the evolution of privacy-conscious identity solutions in a rapidly changing advertising ecosystem.
• Own services end-to-end, from design and implementation through deployment, monitoring, troubleshooting, and continuous improvement.

Who You Are:

• You have at least 5 years of experience with developing and extending large and complex systems.
• Master in Computer science or engineering school or any relevant field
• Familiar with this technical stack: C#, Python, C++, Java
• You are curious about innovative technologies, eventually leading personal subjects on the matter.
• A can do attitude and the ability to work on problems by thinking positively and in a collaborative manner.
• You worked in Agile environments and you are passionate about shipping high quality code!
• Fluent in English

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.