Павло

Pavlo Lysak
Java Developer
Chernihiv, Ukraine | tel. [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)
Summary
Java Developer with 4+ years of commercial experience, primarily focused on backend development. Skilled in building RESTful APIs, and optimizing application performance using Spring Boot and related technologies. Strong background in system administration and IT infrastructure, which provides a solid foundation for understanding enterprise environments. Committed to clean code, problem-solving, and effective collaboration within agile teams.
Technical Skills
• Languages: Java, JavaScript
• Frameworks & Tools: Spring Core/Boot/Security/JPA, Hibernate, Maven, Lombok, Jackson/Gson, Protobuf, Quartz Scheduler, ActiveMQ, React Redux/thunk
• Databases: PostgreSQL, Redis, ClickHouse, H2
• Other: Git, Docker, HTML, SCSS, Web3j, TRON Trident
• Operating Systems: Windows, Ubuntu
Professional Experience
RaveOS — Java Developer (Dec 2021 – Present)
Main project (Dec 2021 – Jun 2023):
• Built backend services with Java 8, Apache Tomcat, Javax, and Jersey
• Designed and documented APIs using Swagger
• Applied Slf4j for logging and Protobuf for efficient data serialization
• Managed data with PostgreSQL, Redis, and ClickHouse
• Focused on performance optimization and scalability
Project 2 (Jun 2023 – Aug 2023):
• Developed scheduling services with Java 11 and Spring Boot
• Implemented job automation using Quartz Scheduler
• Utilized PostgreSQL for persistent storage
Project 3 (Aug 2023 – Aug 2024):
• Built Spring Boot services in Java 11
• Integrated with ASIC devices via HTTP requests
• Used H2 database for lightweight storage and testing
Project 4 (Aug 2024 – Present):
• Developed secure backend systems with Java 17 and Spring Boot
• Implemented Spring Security, JWT, and Google 2FA for authentication
• Worked with PostgreSQL and Hibernate (JPA) for data persistence
• Designed new features and ensured compliance with security standards
Uniops — Java Developer (Jul 2021 – Dec 2021)
• Developed Spring-based microservices using Java 11
• Integrated ActiveMQ for message-driven communication
• Worked with PostgreSQL and Redis for data storage and caching
• Created documentation and troubleshooting guides for internal teams
Outlier — Web Developer (Sep 2020 – Jul 2021)
• Website development and maintenance
Freelance — System Administrator / Developer (2014 – 2020)
• Configured workstations and networks for clients
• Created manuals and FAQs for employees
• Recovered data and administered servers
PNVP Vina Livadii — System Administrator (Apr 2008 – Sep 2014)
• Configured servers (Mail, Active Directory, Firewall, HA Cluster)
• Administered Windows-based servers
• Extended and supported customer networks
PNVP Kvazar — System Administrator (Nov 2007 – Apr 2008)
• Installed LAN and Wi-Fi networks for clients
Languages
• English — Intermediate
• Українська - вільно