Site Reliability Engineer Ii

**Hybrid**

**Paris, France**

**Grenoble, France**

**Engineering**

**Permanent - Full Time**

**Job ID**: r18650

What if, in your next adventure, you were surrounded by people who, like you, look for an unlimited playground to explore, share, and test, would you care to hear more? You've opened the right door As an R&D team, making sure your ideas are heard and encouraged is what we strive to do
**What You'll Do**:
As a Senior Security Engineer in the “Security Yellow” team, you will be at the forefront of our efforts to protect Criteo from cybersecurity threats. Criteo’s technical environment is complex, consisting of thousands of custom services, over 40,000 servers and a diverse technology stack spanning hybrid cloud and on-premise environments. Your role will be a blend of software engineering, and site reliability engineering.

Key Responsibilities:
Software Engineering:

- Develop software that bridges traditional security tools (like SIEMs) with cutting edge technologies like frontier-LLMs, to help ensure that Criteo’s cyber defences evolve more rapidly than the threat actors who target us.
- Assist Criteo engineers in integrating security into the software they design.
- Create and extend systems that solve technical problems that are core to security. Examples:

- Secrets management
- Asset tracking
- Detection & Response
- Vulnerability Scanning

Site reliability engineering:
Run, monitor, and maintain range of custom built, open source, and paid security systems spanning on-premise and cloud infrastructure. Examples:

- ElasticSearch (ELK) stack
- OpenCTI
- Fleetdm
- Hashicorp Vault
- Custome built agentic systems
- Respond to production incidents impacting security systems that run on both Kubernetes and bare metal servers.

Enabling Security Blue Team

Translate Blue team challenges and requirements into concrete technical solutions that empower them to prevent, detect and respond to security threats.

Collaboration:

- Work closely with Security Blue team to ensure the security right tools and infrastructure is in place.
- Collaborate with engineers across the company, helping them integrate security into their designs.

**Who You Are**:
Educational Background:

- Bachelor's degree in Computer Science, or a related field (or equivalent practical experience).

Skills and Experience:

- 3+ years professional SRE and/or SDE experience.
- Deep understanding of SRE best practices (i.e. Google SRE Books).
- Strong computer science fundamentals (computer architecture, operating systems concepts).
- Ability to produce, understand, and analyse code in at least one popular programming language without assistance.
- Ability to heavily leverage LLMs in your daily work, while maintaining a strong understanding of the output, as well as potential pitfalls.
- Effective verbal and written communication skills.
- Cybersecurity experience is a plus but not required.

Soft Skills:

- Interest in cybersecurity.
- Ability to influence without authority to drive security best practices.
- Organizational skills to manage multiple complex tasks effectively.
- Perseverance in continuously improving security systems and tackling

Team Structure and Reporting:

- The security group consists of approximately 30 members, divided in 4 teams: a compliance team, a Yellow team, a Blue team, and an Identity & Access Management team.
- This position will report to the Yellow Team Dev Lead.
- The yellow team’s mission is to design and build long-term security systems, promote security by design, and contribute to it in software engineering efforts across the company.

**Who We Are**:
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.

**What We Offer**:
Own your work style - Build your work around your life and not the other way around.
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 - Competitive salary, equity, performance-based rewards and family-friendly policies.

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 o