Oleksandr

OLEKSANDR PARKHOMCHUK
Java Software Engineer
📍 Bucha, Kyiv, Ukraine | 🔗 [open contact info](look above in the "contact info" section)
PROFESSIONAL SUMMARY
Software Engineer with 4+ years of commercial Java development experience specializing in
microservices architecture and real-time data processing systems. Proven expertise in Spring
Boot ecosystem, distributed systems, PostgreSQL optimization, and event-driven architectures
using Apache Kafka. Strong track record of delivering high-performance solutions for live casino
platforms and real-time analytics systems with emphasis on clean code, SOLID principles, and
collaborative teamwork.

TECHNICAL SKILLS
Core Technologies & Frameworks
Java • Spring Framework • Spring Boot • Spring WebMVC • REST APIs • Microservices
Architecture • Groovy
Databases & Data Management
PostgreSQL (query optimization, indexing, transactions) • SQL • Redis • Couchbase
Messaging & Integration
Apache Kafka (primary) • Apache NiFi • gRPC • Event-Driven Architecture
DevOps & Cloud
AWS • Docker • Kubernetes • Jenkins • Gradle • Git
Development Practices
Clean Code • SOLID Principles • Code Review • Agile/Scrum • TDD • Cucumber • Apache
Superset • Grafana • Prometheus

PROFESSIONAL EXPERIENCE
Java Software Engineer Mar 2024 - Present
AgileEngine (Transvoyant) - Real-time Predictive Analytics Platform
• Designed and developed microservices architecture for real-time supply chain visibility
platform processing high-volume IoT, satellite, and enterprise data streams
• Built scalable data ingestion pipelines with Apache Kafka as the primary messaging
solution, handling event-driven architecture for high-throughput data processing with
reliable message delivery and system resilience
• Implemented RESTful APIs with Spring Boot for event aggregation and analysis,
following REST best practices and security standards (authentication/authorization)
• Optimized PostgreSQL database performance through query optimization, proper
indexing strategies, and transaction management for real-time event processing
• Successfully integrated 4+ new tenants from scratch into the platform, implementing
multi-tenancy architecture and ensuring smooth onboarding with zero downtime
 • Eliminated 99% of Kafka consumer lag in high-load services through performance
tuning, consumer group optimization, and implementing efficient batch processing
strategies
• Demonstrated high adaptability by taking on additional responsibilities in a parallel team,
contributing to cross-team initiatives while maintaining primary project commitments
• Collaborated with cross-functional agile teams, participated in code reviews, and
maintained high code quality standards following SOLID principles

Java Developer Oct 2021 - Aug 2023
BETER Live (ICONIC21), Ukraine - Live Casino & Gaming Solutions
• Developed and maintained microservices for live casino products using Spring Boot,
ensuring high reliability, performance, and system stability under heavy user loads
• Worked extensively with PostgreSQL database, implementing efficient data models and
optimizing queries for real-time gaming operations with proper indexing and transaction
management
• Integrated messaging solutions for event processing and inter-service communication in
distributed gaming platform
• Enhanced testing workflows using real event data with Cucumber for automated testing,
ensuring comprehensive quality assurance
• Successfully executed system migrations and server framework upgrades with zero
downtime, demonstrating strong DevOps collaboration skills
• Implemented real-time analytics and monitoring using Apache Superset, Grafana, and
Prometheus for system observability

EDUCATION
Bachelor's Degree in Applied Mathematics
National University of Kyiv-Mohyla Academy
Sep 2018 - Jun 2022

LANGUAGES
Ukrainian: Native
English: B2 (Upper Intermediate)