Oleksii

OLEKSII KOBZIEV
Senior FullStack Developer (Node.js, React) | TypeScript | Node.js | React
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)

PROFESSIONAL SUMMARY
Full-Stack Engineer with 9+ years of experience building scalable web and mobile applications with Node.js and
React. Proven ability to architect and deliver end-to-end solutions with Node.js backends, React frontends, and
cloud infrastructure on AWS/Azure/GCP. Deeply experienced in app lifecycle management from CI/CD and
testing to publishing, monitoring, and iterative improvement via A/B testing.

TECHNICAL SKILLS
Backend: Node.js, Express, TypeScript, REST API, Swagger
Frontend: React, TypeScript, JavaScript ES6+, Redux Toolkit, Sass/SCSS, Responsive UI, Component
Architecture
Databases & Services: PostgreSQL, Redis, Elasticsearch, MySQL
Cloud & DevOps: Git, Jira, CI/CD Pipelines, Trunk-based development

WORK EXPERIENCE
Tech Lead / Lead Developer - 7 Lucky Looks Dec 2021 - Present
· Architected and delivered scalable full-stack applications with React frontends and Node.js/NestJS backends
serving B2B and B2C markets across web and mobile platforms.
· Led a team of 20 engineers through complete product lifecycle · from system design and database
architecture to production deployment and monitoring.
· Built RESTful and GraphQL APIs with NestJS and Express, implementing clean architecture patterns, input
validation, and comprehensive error handling.
· Designed and optimized PostgreSQL database schemas with proper indexing, query optimization, and
migration strategies for production-scale data.
· Integrated Firebase (Auth, Firestore, Cloud Functions, FCM) and Supabase (Auth, Postgres, Storage, Edge
Functions) as backend services across multiple projects.
· Established CI/CD pipelines with automated testing, linting, and deployment workflows; enforced trunk-based
development and systematic code review practices.

Senior Software Engineer - Freelance / Outsource 2019 - Nov 2021
· Delivered full-stack web and mobile applications for US and EU startup clients using React, Node.js, and
TypeScript across fintech and SaaS verticals.
· Designed and consumed REST and GraphQL APIs; integrated Stripe payment processing and third-party
service integrations.
· Built reusable component libraries and clean architecture patterns optimized for cross-platform code sharing
and maintainability.
· Managed full application deployment pipelines on AWS/GCP with Docker containerization, automated
testing, and monitoring.

Senior Backend Developer - URAN May 2017 - Jan 2019
· Developed and scaled Node.js REST and GraphQL API services (ES6+) following best practices for
maintainability and consistency.
· Managed MongoDB, MySQL, PostgreSQL databases; deployed services on AWS, Azure, GCP.
Frontend Developer - Zazmic Inc Jan 2016 - Jan 2017
· Built and shipped production web applications across multiple outsourced client projects, focusing on
responsive UI and cross-browser compatibility.

Frontend Developer - CSSSR / FICUS TEAM Jun 2014 - Jan 2016
· Led frontend development team, delivered outsourced projects using modern JavaScript and CSS
preprocessors; conducted technical interviews for new candidates.

Fullstack Developer - Freelance / Outsource 2011 - 2014
· Delivered complex freelance projects across web and mobile platforms; proactively mastered emerging
technologies beyond core responsibilities.

EDUCATION
Bachelor's in Economic Cybernetics - Kryvyi Rih Technical University
Stanford Online: Machine Learning & Artificial Intelligence

LANGUAGES
English - Advanced C1/C2 | Ukrainian - Native