Senior Java Developer

Bulgaria, Serbia, Azerbaijan, remote Georgia

We are looking for an experienced Java developer to join a large-scale data-driven platform with millions of users. As a Senior Backend Software Engineer, you’ll architect and optimize the systems powering millions of users worldwide. You’ll help evolve our infrastructure into a scalable, reactive, and event-driven ecosystem supporting real-time social experiences.

Requirements:

5+ years of experience in Java development
Strong expertise with JVM internals (GC tuning, JIT optimization)
Hands-on experience with Vert.x, Kafka, and Cassandra
Solid understanding of microservice and event-driven architectures
Experience with distributed systems handling 50k+ RPS
Practical knowledge of AWS (EKS, S3, Lambda) and Cloudflare Serverless
Familiarity with CI/CD pipelines (GitLab CI/CD on-premise)
Experience with monitoring and observability (Jaeger, Grafana, Prometheus, OTEL)
Strong understanding of data modeling, data locality, and read/write amplification
English: Upper-Intermediate or higher

Will be a plus:

Experience with Apache Flink, Quarkus, or Reactive programming (Mutiny, Reactor)
Familiarity with Redis and distributed caching patterns
Knowledge of Kubernetes and container orchestration best practices
Experience with Infrastructure-as-Code tools (Terraform, Pulumi)
Contributions to open-source projects or developer communities

Product

The platform processes large-scale real-time data and requires a skilled engineer to develop and optimize data pipelines, storage solutions, and analytics systems. You will work closely with a highly experienced Data Architect and collaborate with a strong engineering team to ensure high-quality delivery.

Work Schedule: Full-time working day remotely

Interview stages: