United States onlyAs 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 (Warsaw) - flexibility with in-office collaboration or remote
