Виталий

Vitalii Shevliakov
Backend Engineer (Java) — Strong Mid+ / Senior-ready
city:📍 Netherlands (Apeldoorn)
mail:[open contact info](look above in the "contact info" section)
linkedIn:[open contact info](look above in the "contact info" section)
tel./telegram/ Viber:[open contact info](look above in the "contact info" section), @fatum09
Work authorization: Netherlands — Temporary Protection (no sponsorship required)
Preferred format: Remote EU (B2B / contract)

SUMMARY
Backend Engineer with 7+ years of experience building and maintaining data-intensive SaaS and enterprise systems. Strong background in Java, Spring Boot, PostgreSQL, and SQL-heavy domains using jOOQ.
Specialized in end-to-end feature delivery: from business logic and database design to backend services and UI integration. Experienced in performance optimization (up to 10× DB improvements), async workflows (AWS SQS), and complex integrations (Amazon SP-API).
Comfortable owning features independently, improving legacy codebases, and working in distributed international teams. Pragmatic engineer with strong analytical thinking and focus on maintainable, clean solutions.

CORE SKILLS
Backend & Data Java 8–17, Spring Boot, REST APIs, PostgreSQL, jOOQ, SQL optimization, Liquibase, Flyway
Architecture & Concepts Microservices, clean architecture, async processing, multithreading, performance tuning
Cloud & DevOps Docker, Jenkins, Kubernetes (working knowledge), Git, Maven
UI / Full-stack Vaadin (enterprise UI, custom components, data-heavy grids)
Testing & Quality JUnit 5, refactoring, production issue analysis

Experience
SaaS Services LLC — Java Backend Developer
Jul 2024 – Dec 2025, Netherlands / USA
Worked on a large SaaS platform (Amazon e-commerce & SP-API integrations). Responsible for end-to-end feature delivery, architectural decisions, backend performance, and UI component engineering.
Key Achievements & Responsibilities
• Owned end-to-end development of backend features: database schema → SQL → services → UI components (Vaadin).
• Designed and optimized complex jOOQ queries for data-intensive modules, achieving up to 10× performance improvements and significantly reducing DB load.
• Implemented AWS SQS message workflows for catalog synchronization and background tasks.
• Built internal dashboards with dynamic grouping and aggregation used for operational and business decision-making.
• Improved reliability and error handling of Amazon SP-API batch integrations, including getProductFeesEstimates.
• Enhanced internal frameworks (column configs, data providers, custom Vaadin components).
• Wrote unit tests (JUnit), fixed production defects, improved code readability and architecture.
Tech stack: Java 8, Spring Boot, jOOQ, PostgreSQL, Vaadin 24, AWS SQS, Docker, Jenkins, Git, Maven, JUnit.

EPAM Systems — Java Developer
Jul 2021 – Mar 2024 | Remote (EU)
Enterprise distributed system with multiple microservices.
Key responsibilities:
• Developed and maintained Spring Boot microservices in a large-scale distributed architecture.
• Migrated test suites from JUnit 4 to JUnit 5 and improved overall test coverage.
• Worked on performance testing using JMeter and optimized existing scenarios.
• Improved API Gateway filters using Spring Cloud.
• Built Proof-of-Concept solutions with Camunda BPMN and auxiliary Go services.
• Maintained technical documentation and knowledge base.
Tech stack: Java 8, Spring Boot, Spring Cloud, MySQL, Liquibase, Docker, Kubernetes, Git, Splunk, JMeter, Camunda BPMN.

Office of the National Security and Defense Council of Ukraine — Software Engineer
Dec 2019 – Jul 2021
• Designed database schemas and backend architecture.
• Built RESTful microservices with Spring Boot and PostgreSQL.
• Integrated multiple internal services into a unified platform.
• Set up CI/CD pipelines (Jenkins), Docker infrastructure, and Nginx.
• Developed Python parsers for external data sources.
Tech stack: Java 8, Spring Boot, PostgreSQL, Docker, Jenkins, Python 3, Nginx.

Earlier Career
Software engineering and system administration roles in enterprise and e-commerce environments (2006–2019).

Education
Kharkiv National University of Radio Electronics
Master’s Degree — Computer Systems and Networks (2000–2006)
Mariupol Metallurgical College
Technician-Programmer, Diploma with Honors (1996–2000)

Language:
Russian – Native
Ukrainian: Native
English – B1+ intermediate