Senior Backend Engineer (Java & Spring Boot)

An international cybersecurity and telco security firm is looking for a Senior Backend Engineer to design and optimize backend services powering large-scale telemetry and device management platforms. The role is based in Budapest with a hybrid model (2–3 days onsite).DescriptionYou will work on backend services handling thousands of messages per minute, including schema design, REST/GraphQL API development, and performance tuning. The role involves close collaboration with frontend and tech leads, active participation in code reviews, and a strong focus on testing and reliability.Requirements5+ years of professional Java experience; 3+ years with Spring BootKnowledge of asynchronous/reactive programming (WebFlux, RxJava)Messaging/streaming exposure (Kafka, MQTT, RabbitMQ)Strong SQL and schema design skills (Postgres)Familiarity with Docker/Kubernetes and CI/CD pipelinesExcellent English communication skillsNice to have: TimescaleDB, InfluxDB, Go/Rust/Python for tooling, or Node.js.BenefitsFlexible hybrid work with core hours (10:00–16:00)Choice of personal laptopPrivate health insurance and cafeteria packageCollaborative small senior team with agile mindset