Сергій

[open contact info](look above in the "contact info" section)
SERHII KASHUK [open contact info](look above in the "contact info" section)
Telegram: sergio_k_v
Java Developer Kyiv, Ukraine

PROFESSIONAL SUMMARY
Java Developer with 6+ years of commercial software development experience, specializing in backend development,
enterprise applications, integrations, and data-intensive systems. Strong experience with Java, PostgreSQL, REST
APIs, distributed services, testing, and production support. Experienced in logistics, warehouse management, fleet
management, e-commerce, and financial integrations.

TECHNICAL SKILLS
Backend Java 8/11, Spring Boot, Concurrency, REST, SOAP, WebSocket

Data & Messaging PostgreSQL, MySQL, MongoDB, Redis, RabbitMQ, ZMQ

DevOps Docker, Kubernetes, Jenkins

Testing JUnit, Mockito, unit and integration testing

Web & Formats HTML, CSS, JSON, XML

Tools & Practices Git, Bitbucket,
Bitbucket, Subversion,
Subversion,Jira,
Jira,Confluence,
Confluence,Scrum,
Scrum,OOP,
OOP,Design
Design PatternsCodex, GitHub Copilot
Patterns,

EXPERIENCE
Java Developer
TrackEnsure | 2024 - Present
• Developed and maintained enterprise logistics, fleet management, and warehouse management systems using
Java, PostgreSQL, REST APIs, and web technologies.
• Designed and implemented backend services, APIs, scheduled jobs, reporting solutions, and complex workflows for
shipment tracking, warehouse operations, driver management, and customer portals.
• Designed and optimized PostgreSQL queries, data migrations, and high-volume batch processing, including cleanup
and deduplication workflows for large datasets.
• Integrated GPS/telematics, routing, geocoding, and third-party services for shipment tracking, distance calculation,
location processing, and automated fleet workflows.
• Refactored legacy Java components, resolved production issues, and improved maintainability, reliability, and
performance across backend and database layers.

Java Developer
Astound Digital | May 2021 - July 2024
• Developed and enhanced e-commerce solutions and Order Management System functionality.
• Built and improved Spring Boot services using Redis and PostgreSQL for receiving, parsing, and processing
incoming orders and payment-related workflows.
• Developed unit and integration tests to improve application reliability and support safe delivery of new functionality.

Java Developer
Axon Software | June 2020 - May 2021
• Developed software for integration with cryptocurrency exchanges.
• Received, parsed, and processed market data through REST API, WebSocket, and FIX API integrations.
• Developed internal data-exchange applications using ZMQ and TCP protocols and wrote unit tests.

EDUCATION
National Aviation University
Bachelor's Degree in Software Engineering