Senior Full-Stack Developer

Sergii Vlasiuk

Senior Full-Stack Developer with 20+ years of hands-on experience in designing and building enterprise-grade, high-performance applications. Expert in Java ecosystem, microservices architecture, and modern frontend frameworks. Proven track record of leading technical teams, architecting scalable solutions, and delivering complex projects in financial, telecommunications, and SaaS domains.

Core Competencies:
• Enterprise Architecture & Microservices Design
• High-Performance & Scalable System Development
• Technical Leadership & Team Mentorship
• Cloud-Native Applications (GCP, AWS, PCF)
• Full-Stack Development (Java, Node.js, React, Angular, Solid.js)
• DevOps & CI/CD Pipeline Implementation

Key Achievements & Projects

  1. AI-Powered Support Agent: Led internal hackathon initiative, built gaming platform support agent within one month
  2. Microservices Migration: Successfully migrated legacy monolithic applications to microservices architecture, improving system scalability and performance
  3. Open Source Contributor: Active contributor to iCal4j library and calendar protocol implementations
  4. High-Load Systems: Participated in architectural design decisions for systems processing 10K+ transactions/second
  5. Technical Mentorship: Created architecture training materials for developers focusing on Spring Cloud Stream and non-blocking processing patterns
  6. Knowledge Sharing: Regular presenter at internal tech talks and architecture review sessions

Work Experience

Senior Full-Stack Developer | Tech Lead NDA Company

October 2018 – Present | Ukraine | Remote

  • Leading technical initiatives across multiple full-stack projects under NDA, covering architecture design, team leadership, and hands-on development
  • Architected and developed enterprise microservices using Spring Boot, Spring Cloud, and event-driven patterns
  • Built scalable Node.js backend services with Nest.js framework, implementing GraphQL and REST APIs
  • Delivered end-to-end solutions using Java, Nest.js, Angular, React.js, and Solid.js
  • Designed high-availability systems with focus on scalability, security, and performance optimization
  • Configured and maintained cloud infrastructure on GCP and PCF to save time for dev team
  • Mentored development teams, conducted code reviews, and established engineering best practices
  • Led internal hackathon initiative: built AI-powered support agent for gaming platform within one month

Java Developer | Business Analyst Nextiva

January 2017 – August 2018 | Ukraine | USA

  • Mapped business requirements to technical specifications for telecommunication products
  • Designed microservices architecture following RFC-5545 standards (open-source contribution)
  • Developed RESTful services with Spring Boot, Hibernate, and PostgreSQL
  • Integrated frontend React.js applications with backend services

Developer → Team Lead → Technical Leader → Solution Architect Multiple Companies

June 2011 – December 2016 | Ukraine

  • Progressive career growth across leading IT companies (Luxoft, WorldApp, ArtFactory)
  • Led technical teams in developing enterprise web applications
  • Established development standards and code review processes
  • Architected scalable solutions using Spring framework and modern Java practices
  • Designed and developed n-tier enterprise applications for financial services sector
  • Led team of 5-8 developers on critical banking platform projects

Early Career

Java Developer Various Companies

June 2002 – May 2011 | Ukraine

  • Foundational development experience across diverse companies (Ciklum, Epam, PrivatBank, Government sector)

Education

Poltava Military Institute

Specialist Degree in Telecommunication Networks and Communication Systems

1997 – 2002 | Ukraine | Diploma with Honors

Continuous Learning:
Completed 70+ technical courses and training programs on platforms including Coursera, Udemy, Pluralsight
Active participant in technical meetups and developer communities
Started professional career immediately after graduation in 2002

Interests

🚴 Outdoor Activities | ✈️ Traveling & Camping | 🏂 Bike, Skateboard, Snowboard