Oleksan Vartapetian
Gwangju,41
Summary
As development professional, brings comprehensive expertise in both front-end and back-end technologies. History of successful project completions, contributing to high-performing and scalable applications. Reliable team member known for adaptability and strong focus on collaborative results, with key skills in React and Node.js.
Overview
5
5
years of professional experience
Work History
Full-Stack-Developer
TEMABIT
Remote
09.2023 - 09.2025
- Worked on Fozzy Group’s e‑commerce ecosystem, including Silpo’s online supermarket (shop.silpo.ua) and internal services for orders, payments, and loyalty programs.
- Designed and implemented backend business logic for orders, payments, and subscriptions using Node.js and PostgreSQL within a microservices architecture.
- Migrated legacy monolith modules to independent microservices using Docker and Kubernetes, improving reliability and deployment flexibility on AWS.
- Implemented and optimized inter‑service communication via HTTP APIs and message‑based interactions, ensuring resilience and fault tolerance under high load.
- Optimized PostgreSQL schema and queries (indexes, EXPLAIN ANALYZE), reducing response times of critical endpoints by up to 40%.
- Built and maintained background workers for data processing, scheduled tasks and notifications using task queues and Redis.
- Contributed to architecture discussions, helped design new services and integration flows, participated in code reviews and enforced best practices.
Full-Stack-Developer
BetterMe
Ukraine, Kyiv
06.2021 - 07.2023
- The development of scalable product features is being accomplished using React, Node.js, and PostgreSQL.
- The objective is to enhance system fault tolerance and deployment strategy on AWS.
- The migration of system components to microservices is being executed using Docker and Kubernetes.
- The monolithic application was successfully converted into a microservices architecture using Docker, Kubernetes, Redis, and AWS.
- PostgreSQL queries have been optimized with indexing and EXPLAIN ANALYZE, resulting in a significant reduction in response times, up to 40%.
- We implemented advanced filtering with Elasticsearch.
- I developed full-stack features using React, Node.js, and MongoDB.
- We implemented authentication measures, role systems, and secure API endpoints.
- The project's structure and code quality have been enhanced through the implementation of TypeScript and a modular architectural design.
- Participated in code reviews and introduced best practices for Git workflow.
- Full time - On site
Full-Stack-Developer
GoIT
Remote
12.2020 - 12.2021
- Developed and extended GoIT’s Learning Management System used by students to learn programming and digital skills.
- Built an AI‑powered assistant for students to help with course navigation, answering frequent questions and tracking learning progress, integrated into the LMS backend and UI.
- Implemented a vacancies aggregation service that parsed local job boards (DOU, Djinni) and exposed a searchable API and UI for students.
- Developed full‑stack features using React, Node.js and MongoDB, including authentication, role‑based access control and secure API endpoints.
- Improved project structure with TypeScript and modular architecture, and actively participated in code reviews and Git workflow improvements.
Education
Computer Engineering
IT STEP ACADEMY
Ukraine01-2020
Skills
- Postgresql
- Nextjs
- Nestjs
- Fastapi
- Django
- React
Languages
English
Full Professional
Russian
Full Professional
Ukrainian
Professional Working
Timeline
Full-Stack-Developer
TEMABIT
09.2023 - 09.2025
Full-Stack-Developer
BetterMe
06.2021 - 07.2023
Full-Stack-Developer
GoIT
12.2020 - 12.2021
Computer Engineering
IT STEP ACADEMY