Fullstack Software Engineer – App Growth and Performance

Posted One Month Ago
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Bucharest, București, ROU
In-Office
Mid level
Marketing Tech
The Role
Build and improve Criteo’s App product across backend services, APIs, tracking, attribution, data pipelines, testing, configuration, and observability. Investigate production performance and reliability issues using logs, metrics, and data; identify root causes; recommend solutions; and deliver measurable improvements. Collaborate with Product, Analytics, Operations, Technical Services, and R&D while owning technical topics through implementation, code reviews, and continuous delivery.
Summary Generated by Built In

What You'll Do:

At Criteo, the CIA team contributes to the broader App initiative and works closely with product and engineering teams across the company to improve and grow Criteo's App product.
Because the App product spans multiple systems and teams, the work is not confined to a single service or component. You will join a small, collaborative squad and work wherever the problem leads: from backend services and APIs to data, tracking, configuration, testing, and observability.
This is not a role where success is measured only by shipping features in one component. You will make ambiguous problems understandable, identify what limits product performance, and turn your findings into practical solutions with measurable impact.

  • Investigate App performance, reliability, and integration issues, tracing signals across systems to identify root causes.
  • Use production data, logs, and metrics to explain behavior, validate assumptions, and measure impact.
  • Turn findings into clear recommendations, including options, trade-offs, risks, and expected outcomes.
  • Build and test backend services, APIs, instrumentation, data pipelines, and internal tools to solve complex issues.
  • Work across backend services, click tracking, app linking and landing, MMP integrations, attribution, measurement, and observability.
  • Partner with Product, Analytics, Technical Services, Operations, and R&D to connect technical work to business outcomes.
  • Own topics end to end by identifying gaps, surfacing risks, coordinating stakeholders, and driving delivery through code reviews and continuous delivery.

Technical environment: C#, ASP.NET Core, Angular, TypeScript, APIs, data pipelines, and production observability.

Who You Are:

  • 4+ years of experience building and evolving complex production systems.
  • Strong backend fundamentals in object-oriented programming, service and API design, testing, and production operations; experience with C#, Java, Python, C++, Scala, or a similar ecosystem.
  • An excellent troubleshooter who can navigate unfamiliar systems, trace issues across components, and identify root causes.
  • Comfortable using metrics and production data to validate assumptions and guide technical and product decisions.
  • Technical depth combined with curiosity about the business, product impact, and customer outcomes.
  • An interest in the mobile and app ecosystem, including app links, tracking, attribution, privacy, and mobile measurement partners.
  • An ownership mindset, clear communication, and a commitment to simple, reusable, well-tested code and reliable production systems.

Bonus:

  • Experience with mobile advertising, app measurement, attribution, or mobile measurement partner integrations.
  • Front-end development experience with Angular, React, JavaScript, or TypeScript.
  • Experience with observability, production investigations, data analysis, or distributed systems.
  • Experience translating Product or UX needs into practical technical solutions.

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!

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.  

Skills Required

  • 4+ years of experience building and evolving complex production systems
  • Strong backend fundamentals in object-oriented programming, service and API design, testing, and production operations
  • Experience with C#, Java, Python, C++, Scala, or a similar programming ecosystem
  • Ability to troubleshoot unfamiliar systems, trace issues across components, and identify root causes
  • Ability to use metrics and production data to validate assumptions and guide decisions
  • Ownership mindset, clear communication, and commitment to simple, reusable, well-tested code and reliable production systems
  • Experience with mobile advertising, app measurement, attribution, or mobile measurement partner integrations
  • Front-end development experience with Angular, React, JavaScript, or TypeScript
  • Experience with observability, production investigations, data analysis, or distributed systems
  • Experience translating Product or UX needs into practical technical solutions

Criteo Compensation & Benefits Highlights

The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Criteo and has not been reviewed or approved by Criteo.

  • Healthcare Strength — Health insurance and wellness/mental-health support are described as strong parts of the package, with high reported satisfaction for medical, dental, and vision coverage. Feedback suggests these offerings contribute meaningfully to overall benefits satisfaction.
  • Retirement Support — A 401(k) with company match is highlighted positively, with mentions of a 3%–5% match being common in recent reports. Feedback suggests the retirement program is a valued component of total rewards.
  • Leave & Time Off Breadth — Paid vacation, volunteer time off, and additional summer days are emphasized, and time flexibility is repeatedly praised. Feedback suggests this breadth supports work-life balance perceptions.

Criteo Insights

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The Company
HQ: Paris
2,868 Employees
Year Founded: 2005

What We Do

Criteo is a global technology company that powers the world’s marketers and media owners with trusted and impactful advertising through our world-leading Commerce Media Platform, a suite of products that activates the world’s largest set of commerce data to drive better commerce outcomes. We help thousands of brands, publishers, and retailers reach and monetize audiences and are committed to supporting a fair and open internet that enables discovery, innovation, and choice.

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