Oleg

Oleksyn Oleh
Engineer/Fullstack-developer

SUMMARY

Full-stack web developer with 7 years of commercial experience building scalable web
applications and SaaS platforms. Experienced with modern JavaScript/TypeScript ecosystems
including React, Next.js, Node.js, Ruby on Rails, and cloud-based architectures. Strong
background in both frontend and backend development, API design, data visualization, and
performance optimization.

Actively using AI-powered development tools (ChatGPT, GitHub Copilot, AI-assisted
workflows) to improve development speed, code quality, debugging, and documentation
processes. Experienced in remote international teams, code reviews, and delivering
production-ready solutions in fast-paced environments.

PROFESSIONAL SKILLS

● Javascript, Typescript, Ruby
● React, Next.js, React-Native(Expo), Rails, Express.js, Sails.js
● REST, Graphql, tRPC, WebSocket
● Recoil, Redux, AsyncStorage
● Postgres, MongoDB, Redis
● Knex, Prisma, Mongoose
● AWS services (ec2, route53, SES, RDS)
● Figma, AdobeXD, Zeplin
● GIT, Bitbucket, ClickUp, Jira
● AI-assisted development workflows
● Other: Playwright, Amcharts, AgGrig, Styled Components, Konva.js

WORK EXPERIENCE

Implex (UA, Outstaff) - Apr 2024 to present, Fullstack Developer

Work Arrangement: Remote, Contract

● Developing and maintaining microservice-based applications using Next.js,
WunderGraph, Node.js, and Ruby services. Implementing business logic for both
frontend and backend systems. Participating in architecture discussions and
improving scalability of internal services. Performing code reviews and maintaining
code quality standards across the team. Using AI-assisted development tools to speed
up implementation, debugging, refactoring, and documentation tasks.

OverlayAnalytics (USA, Product) - Sep 2021 to Oct 2023, Fullstack Developer

Duration: 2 years 2 months | Work Arrangement: Remote, Contract

● Developed financial monitoring and analytics tools for enterprise clients. Built custom
dashboards and reporting systems using React, AmCharts, GraphQL, Node.js,
PostgreSQL, and Prisma. Worked on backend APIs, data processing, and frontend
performance optimization. Collaborated closely with designers and product teams in a
remote international environment. Leveraged AI tools to improve productivity,
automate repetitive tasks, and accelerate development workflows.

Pettersonapps (UA, Outsource/Outstaff) - Jan 2018 to Aug 2021, Fullstack Developer
Duration: 3 years 8 months | Work Arrangement: On-site, Full-time
● Developing applications in different spheres – sport, education, analytics, medicine.
Creating from scratch CRM’s, API’s, landing pages and mobile applications on react
native.
● Requirements analysis and clarification
● Estimation, prioritization, and distribution of tasks
● Unit testing
● Product support and documentation maintenance
● Development and support web apps

Flex Ukraine - Apr 2017 to Jan 2018, Test Engineer
Duration: 7 months | Work Arrangement: On-site, Full-time
● Designed, developed, and implemented custom test equipment for product testing
and quality control.
● Programmed and configured automated test systems using BASIC, Arduino, and C++.
● Performed testing, troubleshooting, and analysis of test results to identify and resolve
product and equipment issues.
● Worked with electronic components, electrical circuits, measurement instruments,
and test equipment.
● Collaborated with engineers and production teams to improve testing processes and
ensure reliable test equipment operation.
LANGUAGES

Ukrainian: native.
English: upper-intermediate(B2)
EDUCATION

Uzhgorod National University, Ukraine
Master’s Degree in semiconductor physics