Dmytro S.

Senior Java Engineer and Tech Lead with 8+ years of commercial experience building backend systems for iGaming, B2B SaaS, sales engagement, mobility, and data platforms. I own Java/Spring microservices end to end — architecture and API design, development, deployment, production support, and documentation. What I can do for you: • Design and build microservice back ends with Java (8–25), Spring Boot, Spring Data/Security, Hibernate/JPA • Design RESTful APIs and third-party integrations (Salesforce, Gmail and Outlook plugins) • Work with SQL and NoSQL data: PostgreSQL, MySQL, MongoDB, Cassandra, Amazon Redshift — schema design, stored functions, Liquibase migrations • Build big-data aggregation and reporting with Apache Spark and AWS S3 • Set up messaging and caching with Kafka, RabbitMQ, and Redis • Configure AWS (EC2, S3), Docker, and CI/CD with Jenkins and GitLab CI • Lead a team: architecture decisions, requirements with stakeholders, feature ownership, delivery Selected results: • Designed and implemented data migration from hot storage (Cassandra) to cold storage (S3) for an iGaming back office, enabling Spark aggregation and a reporting system with RTP monitoring. • Designed the architecture of a desktop time-tracking platform end to end: microservice back end (Spring Boot/Security, RabbitMQ, Redis, Docker), JavaFX desktop client, and management front end. • Designed the architecture and built the microservice back end of an AI-driven sales engagement platform, including PostgreSQL stored functions and migration scripts. • Delivered new Gmail and Outlook plugins and a Salesforce integration on a large multi-team B2B sales engagement platform (MySQL, Amazon Redshift, S3). • Grew from Software Developer to Tech/Team Lead at Playnetic, leading the team since 2023. I work test-driven (JUnit, Mockito) and take ownership from requirements to production support. Send me a message about your project — I'm happy to discuss architecture, estimates, or a technical review.