Богдан

Bohdan Ovchar
Java developer
CONTACT

Ukraine, Chernihiv

PROFILE [відкрити контакти](див. вище в блоці «контактна інформація»)

Java backend engineer with 5+ years of experience building and maintaining [відкрити контакти](див. вище в блоці «контактна інформація»)
complex systems, including enterprise integrations, data processing
pipelines, and high-load desktop applications. @Klerk1t
Strong focus on:
system design and business logic implementation
performance optimization and concurrency
data consistency across distributed systems
Experienced in Java (8–21), Spring ecosystem, SQL, and integration
technologies (REST, SOAP, messaging).
TECHNOLOGIES
WORK EXPERIENCE
Java 8 - 25
Java Developer at RealView-UA 11.2022 - 06.2025 (2y 6m)
Spring: Core, Boot, Security, Data,
Developed and maintained a complex desktop application for 2D/3D interior AoP
design used by professional designers. Implemented core business logic for
product configuration, pricing, and rendering. Worked with databases (JDBC, Data: Hibernate/JPA, SQL, JDBC,
H2, MS Access) and internal tools. Investigated production issues, including MongoDB
performance bottlenecks and concurrency problems.
Concurrency: Multithreading, async
Key Achievements: processing, thread synchronization
Designed and implemented a flexible data import system (Excel → DB)
API & Communication: REST APIs,
with dynamic schema mapping, validation, and transactional safety,
OpenAPI / Swagger, SOAP, Apache
significantly reducing manual operations
Kafka, messaging systems
Redesigned core domain logic for product structure calculations (doors,
drawers, pricing), consolidating fragmented implementations into a Caching & Performance: Caffeine,
unified and maintainable solution Redis
Implemented complex product modification features, combining
multiple transformation layers (visual + business logic), improving system Security: OAuth2/JWT
flexibility
Diagnosed and resolved multithreading issues (thread contention, UI Observability: Micrometer,
freezes) using profiling tools (VisualVM) and synchronization strategies Prometheus, Grafana
Led migration from Java 8 to Java 21, resolving compatibility issues and
stabilizing runtime behavior DevOps: Docker, Kubernetes,
Automated build and packaging of internal libraries (JCEF), removing Jenkins, Git
IDE dependency and improving developer workflow
Reactive & Async: WebFlux, Project
Reactor
 SKILLS
Java Developer at Sagax Software 09.2021 - 11.2022 (1y 2m)
Developed backend systems for insurance products (Java, Spring, Architectural approaches: monolithic,
Hibernate). Maintained legacy monolithic system and desktop client (Eclipse microservices, async(reactive,
RCP) .Implemented integrations with external partners via Mule ESB event-driven), SOA, Multitier,
(SOAP/HTTP). Participated in production support, bug fixing, and Hexagonal
performance tuning
Software development principles:
SOLID, DRY, KISS, YAGNI, BDUF,
Key Achievements:
APO
Implemented a new insurance product end-to-end, including backend
logic, UI, payment flow, and integration with core systems and partners Software architecture patterns:
Optimized data access layer by resolving inefficient Hibernate queries, Asynchronous messaging, Client–
improving performance and reducing timeouts server, MVC, Retry pattern, Rate
Developed and maintained integration flows (data mapping, validation, limiting, Idempotency
transport layers)
Troubleshooting: Logs analyzing,
Reproducing, VisualVM profiling
IBM Integration Bus at Intertop Ukraine 05.2020 - 09.2021 (1y 4m)

Developed integration services between enterprise systems (SAP, WMS,
Bitrix, internal services). Worked with IBM Integration Bus, REST/SOAP APIs, LANGUAGES
queues, and database operations. Ensured data validation and consistency
across multiple systems. Provided L2 support and incident resolution. Ukrainian - Fluent
English - B1
Key Achievements:
Designed and implemented incident routing service, automatically
identifying responsible teams based on system state, reducing manual
triage
Developed inventory synchronization service, eliminating manual fixes
and improving data consistency across systems
Implemented in-store reservation flow, integrating kiosk systems with
backend services and order lifecycle
Built tools for bulk product updates, automating manual workflows for
business users
Migrated SQL logic from Oracle to MySQL and supported platform
upgrades

EDUCATION

Bachelor of Software Engineering 2017 - 2021
Kyiv Politechnic Institute|FICS