Сергій

SERHII BESARAB
BACKEND DEVELOPER

[open contact info](look above in the "contact info" section)
" Backend Developer with 4+ years of experience designing and delivering scalable
microservices in Java and Kotlin. Skilled in reactive programming, with a strong
[open contact info](look above in the "contact info" section)
background in databases, testing, and cloudnative tools. Known for improving system
@NoSuchElement performance, ensuring reliability through automation, and contributing to team efficiency.
Looking for a role where I can apply my expertise to build high-performance systems and
Kyiv, Ukraine
continue growing professionally.

SKILLS WORK EXPERIENCE

Backend Development Java/Kotlin Developer 2021 - now

Java (Collections, Stream API, Right and Above
Multithreading), Spring Boot (Core, Data,
Security, MVC, WebFlux), Kotlin • Built and supported scalable microservices in Java(Spring Boot/WebFlux) and Kotlin (Vert.x, Coroutines,
(Coroutines, Vert.x, Arrow), Python (Flask) Arrow), used across financial, healthcare, and enterprise systems.

• Modernized legacy systems by migrating them to reactive microservices, which improved system speed,
Cloud & Architecture
reliability, and compliance.
AWS, Microservices, Event-driven
• Enhanced system stability by adding distributed tracing, auditing, and real-time metrics, making
Architecture, API Gateway, RESTful APIs
troubleshooting faster and more transparent.

Databases & Persistence • Raised software quality with broad automated testing (unit, integration, end-to-end, load, and BDD),
which cut release risks and increased confidence in production deployments
PostgreSQL, MySQL, MongoDB, Redis,
Hibernate, jOOQ, Database Design, • Improved team efficiency by creating documentation and automated local setups, reducing onboarding
Performance Optimization time for new developers

Testing & Quality
Technical Project Manager 2016 - 2021
JUnit, Mockito, Kotest, MockK, Pytest,
Testcontainers, Selenium, Locust, Top Date
Cucumber, TDD, BDD, Code Reviews
• Led technical architecture and development of custom client-server system on Linux, managing team of 5
engineers using Agile/Scrum methodology
DevOps & Monitoring
• Designed scalable system architecture (operator workstations + centralized server) supporting 200+
Docker, Kubernetes, Jenkins, Git, Maven,
concurrent users
Gradle, Liquibase, Prometheus, Grafana,
CI/CD • Authored comprehensive technical documentation, API specifications, and UI/UX wireframes for
development team
Integration & Security • Managed complete software development lifecycle including requirements gathering, prototyping, testing,
Kafka, Swagger/OpenAPI, Keycloak, Auth0, and deployment
OAuth 2.0, JWT, HTTPS/TLS
• Coordinated cross-functional team of developers, QA engineers, and business analysts to meet project
deliverables
Development Practices
Agile/Scrum, Load Testing, Performance
Technical Project Manager 2015 - 2016
Profiling, Caching Strategies, Distributed
Tracing, Technical Leadership
GCS

• Managed development of public-facing charity web portal serving 10K+ monthly visitors
EDUCATION • Defined technical requirements, created detailed API specifications and responsive UI wireframes

• Led Agile development cycles, managing backlog and deliverables for 4-person team
National Aviation University
• Coordinated outreach initiatives through strategic communication with media partners and volunteers
Master of Computer Systems Engineering
2008 - 2013
Head of IT Department 2012 - 2015

Russell Bedford RCG
LANGUAGES
• Directed IT strategy and infrastructure for 100+ employee accounting firm, managing annual IT budget
Ukrainian - Native • Led team of 6 developers and system administrators, overseeing software development and maintenance
projects
English - Upper-Intermediate
• Implemented digital transformation initiatives improving operational efficiency and reducing IT costs

• Managed vendor relationships and procurement processes, negotiating contracts

• Conducted internal IT audits ensuring compliance with financial regulations and security standards

• Architected disaster recovery solutions achieving 99.7% system availability and RPO of 1 hour

IT Systems Specialist 2011 - 2012

Ukrvodservice

• Maintained and optimized software, hardware, and network infrastructure for 20+ workstations

• Administered VoIP telephony systems and Linux server environments

• Provided technical support and LAN administration

• Implemented automated backup solutions reducing data recovery time