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: * 1-st stage — call with the Recruiter * 2-nd stage — Technical interview with our Developer and the Recruiter * 3-rd stage — Client interview
Our Benefits * Projects with modern stack * Work from anywhere (fully remotely or in our office) * Paid vacations and sick-leaves, additional days-off, relocation bonus * Wellness: Medical insurance/ sport compensation/ health check-up+flu vaccination at your choice * Education: regular tech-talks, educational courses, paid certifications, English classes * Fun: own football team, budget for team-lunches, branded gifts * One of the best IT employers in Lviv based on DOU rating
