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EER Poland career site
Warszawa · Hybrid

Backend Engineer - AdTech company/B2B/Warsaw hybrid

We’re looking for a Mid-Level Back-End Developer to join the Warsaw engineering team. In this role, you’ll design and build scalable backend systems and APIs using Java and Spring Boot, working with t

As a Back-End Developer, you will design, build, and optimize backend services and APIs that power large-scale, data-driven systems. You’ll play a key role in shaping architecture decisions, improving performance, and ensuring the reliability of high-traffic distributed systems.

This position is perfect for someone who thrives in a fast-paced environment, enjoys technical challenges, and values teamwork and impact.

Key Responsibilities:

  • Design and develop scalable, modular backend applications and APIs using Java and Spring Boot.
  • Own the full development lifecycle — from analysis and coding to deployment and production monitoring.
  • Improve system scalability, performance, and reliability.
  • Collaborate closely with Product, DevOps, BI, and Marketing teams on cross-functional initiatives.
  • Implement robust logging, monitoring, and alerting (Prometheus, Grafana, Kibana).
  • Promote best engineering practices, code quality, and maintain technical documentation.
  • Mentor junior developers and contribute to team growth.

Requirements:

  • Bachelor’s degree in Computer Science or equivalent practical experience.
  • 3+ years of experience in Java development (strong Spring Boot background).
  • Proven experience building and maintaining distributed systems and microservices (Docker, Kubernetes).
  • Strong understanding of scalability, concurrency, and performance optimization.
  • Experience with CI/CD pipelines and automated deployments.
  • Ability to monitor and improve application performance using tools such as JFR, JMeter, Micrometer, New Relic, or Datadog.
  • Excellent communication and collaboration skills.

Nice to Have:

  • Experience with NoSQL (MongoDB, Couchbase) and SQL databases.
  • Knowledge of Reactive Programming (Spring WebFlux).
  • Familiarity with Prometheus, Grafana, Kibana for monitoring and alerting.

Why Join:

  • Be part of a global company building technology that reaches billions of mobile users.
  • Work in a collaborative, data-driven environment using modern technologies.
  • Competitive compensation and benefits package.
  • Hybrid work model — flexibility with in-office collaboration.
Locations
Warszawa
Remote status
Hybrid
Warszawa · Hybrid

Backend Engineer - AdTech company/B2B/Warsaw hybrid

We’re looking for a Mid-Level Back-End Developer to join the Warsaw engineering team. In this role, you’ll design and build scalable backend systems and APIs using Java and Spring Boot, working with t

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