Mykhaylo S.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I’m a senior engineer with 15+ years of hands-on backend and architecture experience. I specialize in Java (8–21), Spring Boot, high-throughput microservices, distributed systems, and automation. I’ve built fraud-detection platforms running at 99.99% SLA, modernized legacy systems, and delivered projects across fintech, SaaS, healthcare, and enterprise environments. What I do: • Design and build modular backend services (REST, async, messaging) • Java 21+, Spring Boot (Web, Security, Data, Messaging) • Concurrency, performance tuning, debugging complex systems • PostgreSQL, MySQL, Redis, messaging (SNS/SQS, Kafka-like stacks) • Secure coding, auth, data protection • CI/CD pipelines, test automation, GitHub Actions/Jenkins • AWS: EC2, RDS, S3, IAM, CloudWatch • Docker, Linux, containerized deployments How I work: • Ownership from design → delivery • Clean, predictable code • Strong communication with distributed teams • Focus on measurable impact and reducing operational noise If you need a senior engineer who can join, stabilize, and deliver quickly — let’s talk.