Fullstack Software Engineer role focused on App Growth and Performance at Criteo. Responsibilities include investigating app performance and integration issues, using production data to analyze and measure impact, building backend services, APIs, data pipelines, and internal tools, and collaborating with multiple teams to connect technical work to business outcomes. Requires 4+ years experience in complex production systems, strong backend programming skills (C#, Java, Python, C++, Scala), troubleshooting skills, and interest in mobile app ecosystem. Bonus skills include mobile advertising, front-end frameworks (Angular, React), observability, and translating product needs into technical solutions. Hybrid work model based in Bucharest, Romania. Benefits include career development, health and wellness support, diverse team environment, and competitive salary with potential equity.
What you'll do
Investigate App performance, reliability, and integration issues, tracing signals across systems to identify root causes
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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
Requirements
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
Excellent troubleshooting skills to navigate unfamiliar systems and identify root causes
Comfortable using metrics and production data to validate assumptions and guide decisions
Technical depth combined with curiosity about business, product impact, and customer outcomes
Interest in mobile and app ecosystem including app links, tracking, attribution, privacy, and mobile measurement partners
Ownership mindset, clear communication, commitment to simple, reusable, well-tested code and reliable production systems
Bonus: experience with mobile advertising, app measurement, attribution, or mobile measurement partner integrations
Bonus: front-end development experience with Angular, React, JavaScript, or TypeScript
Bonus: experience with observability, production investigations, data analysis, or distributed systems
Bonus: experience translating Product or UX needs into practical technical solutions
Hybrid working model blending home and in-office experiencesLearning, mentorship, and career development programsHealth benefits, wellness perks, and mental health supportDiverse, inclusive, and globally connected teamAttractive salary with performance-based rewards and family-friendly policiesPotential for equity depending on role and level
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