Serhii D.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.

🤟 As an accomplished Technical Lead, I bring a wealth of expertise in engineering and product development. With extensive experience in building high-load systems, e-commerce platforms, and blockchain solutions, I am well-versed in managing large teams and overseeing product lifecycles. My proficiency extends to distributed computing and data analysis, ensuring robust and scalable solutions. Why Choose Me: ► Extensive Project Diversity: With over a decade of experience spanning diverse projects, including big data, blockchain, fintech, and cybersecurity, I bring a wealth of expertise to the table, ensuring versatility and adaptability to various industry needs. ► Effective Communication Bridge: Equipped with strong social and management skills, I excel in facilitating seamless communication between business and technical teams. I possess the ability to translate complex business objectives into actionable technical tasks, fostering cohesion and alignment across all project stakeholders. ► Proactive Leadership: As a proactive team player with demonstrated leadership capabilities, I drive projects forward with efficiency and efficacy. My ability to provide clear direction, offer valuable insights, and lead by example ensures the successful execution of projects while maintaining a collaborative and supportive environment. ⚒️Skills: ►𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬 : - Core: Java, Kotlin - Additional: SQL, Groovy, Go, Python, JS, Bash, C++ ►𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 & 𝐓𝐨𝐨𝐥𝐬: Enterprise, General Development & Integrations: - Spring Framework (MVC, Data, IoC, AOP, Security, Integration) - EJB, - Apache Camel - JAX-RS, JAX-WS - JDBC, JPA, Hibernate - JUnit, TestNG, Mockito ►𝐄𝐋𝐊 ►𝐁𝐢𝐠 𝐃𝐚𝐭𝐚: - Apache Flink (Stream API, DataSet API) - Hadoop ►𝐐𝐮𝐞𝐮𝐞𝐬 & 𝐌𝐞𝐬𝐬𝐚𝐠𝐞 𝐁𝐫𝐨𝐤𝐞𝐫𝐬: - Apache Kafka - Rabbit - JMS (ActiveMQ, RabbitMQ) - Redis - Docker, Docker Compose - Maven, Gradle, Git, SVN, Jenkins, CMake, Ant ►𝐃𝐁: - RDBMS: MySQL, PostgreSQL, MariaDB, MSSQL, Oracle - NoSQL: MongoDB, Cassandra, Neo4J, Redis 🤝I am excited to apply my expertise and collaborate with you to achieve exceptional results for your projects.