Andriy

Andriy Parashchuk
Software Engineer (Node.js | Ruby on Rails | React)
phone: [open contact info](look above in the "contact info" section) | email: [open contact info](look above in the "contact info" section) | telegram: @jdfk_p19
location: Krakow, Poland

SUMMARY

Full-Stack Engineer with 8+ years of experience designing and delivering
scalable web applications and distributed systems. Strong backend
expertise in Node.js and Ruby on Rails, with hands-on experience in system EDUCATION
architecture, microservices, API design, and database optimization. Proven
track record of improving system performance and delivering complex Master’s in Computer Science
products from concept to production. Experienced across the full software Lviv Polytechnic National University
development lifecycle, mentoring developers, driving architecture decisions, 2006 – 2011 | Lviv
and collaborating closely with product and business stakeholders.

PROFESSIONAL EXPERIENCE SKILLS

Architecture:
Full-stack Developer Lviv | 2018 - 2026
• Microservices • RESTful API Design
JetThoughts
• Event-Driven Architecture
Built and maintained scalable web and mobile applications using RoR • Distributed Systems
and Node.js, implementing core business logic and system integrations.
Backend:
Contributed to frontend development using React and React Native,
delivering end-to-end features and seamless API integrations. • Node.js • TypeScript • NestJS
• Express • Tsoa • TypeORM
Redesigned PostgreSQL data models and optimized critical queries,
reducing average API response time by 40%. • Ruby • Ruby on Rails

Developed and supported RESTful APIs, implementing complex business Databases:
logic, integrations, and data processing workflows.
• PostgreSQL • Redis
Built interactive web interfaces using Hotwire and Stimulus, reducing
reliance on heavy frontend frameworks. Frontend:

Increased automated test coverage from 55% to 90%, significantly • React • React Native • Next.js
reducing production regressions and deployment risks. • Redux • Hotwire (Turbo, Stimulus)
Participated in code reviews, architecture discussions, and project Testing:
planning to deliver scalable and maintainable systems.
• Jest • Vitest • Supertest
Led architecture discussions and proposed scalable solutions for new
• RSpec • Minitest • Capybara
product initiatives.
Participated in technical discovery, estimation, and system design • Git
Infrastructure & Tools:
sessions. Languages:
• AWS S3 • Docker
• English • Spanish
Front-end Developer Lviv | 2017 - 2018 • GitHub Actions • CircleCI
Ester Digital • Git • GitHub
• Claude Code
Developed responsive and cross-browser compatible web applications • ESLint • Prettier • Rubocop
from UI/UX designs using HTML, CSS, JavaScript, and SASS.
Collaborated with designers and backend developers to deliver
high-quality, maintainable frontend solutions.

Front-end Developer Lviv | 2015 - 2017
EliteIT

Built responsive web applications using HTML, CSS, JavaScript, and
Bootstrap.
Collaborated with designers and backend developers to deliver
production-ready interfaces.