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Senior Java Developer at Globaldev Group. We are looking for a Senior Back-End Developer to take ownership of complex backend systems, lead technical architecture decisions, and mentor the next generation of developers. You will work with cutting-edge technologies to design, build, and optimize services that impact billions of mobile users worldwide.. This is a hands-on leadership role — ideal for someone who thrives in a fast-moving environment, enjoys collaborating across functions, and is driven to deliver scalable, reliable, and future-proof systems.. Requirements:. Bachelor’s degree in Computer Science or equivalent practical experience;. 5+ years of professional Java development experience;. Proven track record in designing and delivering complex distributed systems and microservices (Docker, Kubernetes);. Strong understanding of scalability, concurrency, and performance optimization challenges;. Hands-on experience with CI/CD tools and automated build/deployment pipelines;. Proficiency in Spring & Spring Boot frameworks;. Excellent communication skills and the ability to influence technical direction across teams;. Experience running applications on Kubernetes, with a focus on designing services that scale efficiently and consume resources effectively (rather than cluster administration);. Ability to measure and improve application performance using profiling, benchmarking, and APM tools (e.g., JFR, JMeter, Micrometer, New Relic, Datadog).. Responsibilities:. Design and develop highly scalable, modular backend applications and APIs using Java and Spring Boot;. Own the full development lifecycle — from requirements analysis, design, coding, and testing to deployment and monitoring in production;. Lead initiatives to improve system scalability, performance, and security;. Collaborate closely with Product, Algo, DevOps, BI, and Marketing to deliver integrated, business-driven solutions;. Ensure observability through robust logging, metrics, and alerting with tools like Prometheus, Grafana, Kibana;. Drive adoption of engineering best practices, code quality standards, and technical documentation;. Mentor and guide junior developers, fostering knowledge sharing and continuous improvement.. Will be a plus:. Background with NoSQL databases (MongoDB, Couchbase) and SQL databases;. Knowledge of reactive programming (Spring WebFlux);. Familiarity with monitoring and alerting tools such as Prometheus, Grafana and Kibana.. What we offer:. Help and support from our caring HR team;. 20 days of vacation;. Health Insurance;. Gym Subscription (Multisport);. The exchange of experience and work with talented colleagues;. Last but not least - valuable compensation for your efforts.. Company Location: Ukraine.