Aндрій

KOSTENKO ANDRIY
Fullstack Developer

[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Telegram | Gmail | Brovary, Ukraine

SUMMARY
Full-Stack Developer with ~4 years of experience building data-intensive applications. Experienced in
optimizing backend services, improving performance of applications that process and display large
datasets, reducing database costs and refactoring complex architectures. Worked with server setup and
deployment, CI/CD pipelines and performance optimization. Built interfaces with focus on responsiveness
and maintainability, optimized application load times and handled large analytical queries. Comfortable
working across the full development lifecycle — from architecture to implementation and production.

WORK EXPERIENCE (4 YEARS)

Full-Stack Developer — Interactive Media Platform, Spinocchio Feb 2024 - Mar 2026
Built secure APIs and backend services for third-party integrations, API key authentication and
protected endpoints to ensure secure communication with partner systems
Developed back-office systems and internal platform tools, enabling operational teams to
manage platform content, user data, and transactional records
Worked on refactoring legacy backend services into a modular architecture, improving code
maintainability, scalability, and enforcing a consistent development structure across the team
Optimized complex BigQuery queries, reducing API response times for high-load operations
Full-Stack Developer — AI SaaS Platform, PrideAff Jan 2023 - Sept 2024
Contributed to the development of an AI-powered SaaS platform that enabled users to query
connected databases using natural language and analyze business data.
Developed frontend and backend features, including conversational workflows, query builder
components, and data visualization interfaces.
Participated in architecture improvements, deployment processes, and CI/CD setup
Collaborated with the team to deliver features from implementation through testing and
production release.
Freelance Full-Stack Developer Aug 2022 - Nov 2023
Developed and maintained web applications for clients using frontend and backend
technologies
Built custom WordPress solutions, including themes, integrations, and backend functionality
Created REST APIs and integrated third-party services and payment systems
Configured servers, deployments, and hosting environments for client projects
Improved website performance, loading speed, and maintainability across multiple projects
Worked directly with clients to deliver features, fixes, and production support

EDUCATION

Bachelor of Computer Science Jan 2021 - Feb 2025
National university of life and environmental
sciences of Ukraine

KEY SKILLS

JavaScript / TypeScript (Vue, DevOps basics Third-party API integration
React, Node.js, NestJS) Programming languages (Axios, external services)
Backend development (Python, PHP, Go, C) Full-stack development