Bohdan

BOHDAN HOLOVIN
Java Developer
E [відкрити контакти](див. вище в блоці «контактна інформація»)  [відкрити контакти](див. вище в блоці «контактна інформація») q github.com q linkedin  Kyiv, Ukraine s Telegram - @bohdan_holovin

SUMMARY
Java Developer with 2+ years of experience building production-ready systems for government and commercial projects.
Specialized in scalable microservice architectures using Java, Kotlin, and the Spring ecosystem.
Proficient in relational (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis) databases.
Led development of Ukraine’s national Biomethane Registry.
Comfortable with frontend tasks. Passionate about clean code, domain-driven design, and building well-tested, maintainable backend
systems. Strong team player focused on quality and continuous improvement.

EXPERIENCE
Full Stack Developer
State Agency on Energy Efficiency and Energy Saving of Ukraine
11/2024 - Present Kyiv, Ukraine
Team size: 2–3 developers
• Description:
- Led development of Ukraine’s national Biomethane Registry, including system and database architecture from the ground up.
- Integrated Qualified Electronic Signature (QES) for document signing and authentication via ID.GOV.UA.
- Developed a user interface aligned with public institution design standards.
- Involved in the full development lifecycle: from analysis and design to deployment.
- Ensured test coverage (unit, integration, E2E) and implemented CI/CD with Docker.
• Experience Gained:
- Deepened expertise in secure, layered backend architecture using Java 21 and Spring Boot.
- Designed efficient PostgreSQL and MongoDB data models tailored to business needs.
- Embedded QES and OAuth2 flows in complex, multi-step business processes.
- Gained hands-on experience with secure sessions, file handling, and role-based access control.
- Improved testing practices with structured use of JUnit and Mockito.
- Delivered responsive, server-rendered UIs using Thymeleaf, Bootstrap and JavaScript.
- Strengthened full-stack thinking in a small, high-responsibility team.
- Maintained product quality and stakeholder communication without dedicated BA/QA roles.
• Technologies Used: Java 21, Spring Boot, Spring Security, REST, Thymeleaf, Bootstrap 5, JavaScript, PostgreSQL, MongoDB, Docker,
JUnit, Mockito, OAuth2.

Java/Kotlin Developer
Ajax Systems
01/2023 - 03/2024 Kyiv, Ukraine
Team size: Up to 7 developers
• Description:
- Contributed to the development and maintenance of backend services in a high-load microservices environment.
- Delivered new features, resolved production issues, and optimized existing functionality.
- Worked closely with cross-functional teams, including frontend and mobile, to ship full-cycle features.
- Participated in code reviews and improved internal engineering standards and workflows.
• Experience Gained:
- Deepened expertise in microservice-based architecture and distributed systems.
- Gained practical experience with Java, Kotlin, Spring Boot, and Spring Cloud.
- Applied reactive programming patterns using Project Reactor.
- Practical knowledge of message brokers and data streaming with Nats and Kafka.
- Experience with various databases including MySQL, MongoDB, and Redis.
- Skills in containerization and orchestration using Docker.
- Using gRPC for communication between the server-side and external components (apps on devices).
- Limited practical experience with Jenkins for CI/CD processes.
• Technologies Used: Java 13, Java 17, Kotlin, Spring Boot, Spring Cloud, Project Reactor, Nats, Kafka, MySQL, MongoDB, Redis, Docker,
gRPC, Jenkins, React.js.

EDUCATION
Master's degree
National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”
09/2018 - 01/2024 Kyiv, Ukraine
• Faculty: Institute of Applied System Analysis
• Specialty: Computer Science

LANGUAGES
English Intermediate (B2) Ukrainian Native

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SOFT SKILLS
Clear and concise communication Fast learner, quick to adapt Team-first mindset
Focused on outcomes and smart Calm under pressure, direct in Driven by improvement and code
priorities feedback quality

Led small agile team in production Always improving

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