Senior Java Developer

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

Recruiter – Anastasiia Vaskiv