andrewdev

Full Stack Developer (Java Script/React.Js/Node.Js)

Full-Stack Developer with 3 years of production experience specializing in scalable web applications and performance optimization. Successfully delivered 15+ projects across diverse industries including CRM systems, e-commerce platforms and laboratory automation. Experienced in React, Node.js, NestJS and Next.js with proven expertise in complex business logic implementation, API architecture and frontend-backend integration. PhD in Ecology brings analytical rigor and systematic problem-solving approach to software development.


Experience: 2 years

Yearly salary: $0

Hourly rate: $20

Nationality: πŸ‡ΊπŸ‡¦ Ukraine

Residency: πŸ‡ΊπŸ‡¦ Ukraine


Experience

Full Stack Developer
C4
2025 - 2025
Member of C4, a decentralized Web3 development collective participating in builder bounty programs and protocol ecosystem initiatives. Currently focused on Zama's FHEVM protocol, developing privacy-preserving decentralized applications with confidential smart contracts: - Built and deployed 30+ DApps showcasing FHEVM capabilities (Fully Homomorphic Encryption for EVM) β€’ Implemented end-to-end solutions: Solidity smart contracts, frontends, wallet integration, testnet deployment β€’ Developed projects including PrivateSubscriptionCalibrator and other confidential computing use cases β€’ Conducted smart contract testing, debugging, and optimization on Sepolia testnet β€’ Collaborated with collective members on protocol R&D and technical documentation
Full Stack Developer
Repito
2025 - 2025
Optimized 70,000+ images achieving 90% size reduction (60GB β†’ 8GB) and 10-15x faster load times through WebP conversion and intelligent compression. Designed the application and coded my own narrow-field expertise into its logic, making complex tasks at the level of laboratory head/candidate of science accessible to users without special training. Automated complete laboratory workflow reducing data processing time by 60% (2-3 hours β†’ 40-60 minutes) through real-time calculations and PDF report generation. Built centralized data environment with advanced search and analytics, replacing scattered Notion/Word/Excel/Drive documents. Developed REST API for route aggregation with optimized MongoDB queries, complex filtering and user-specific settings. Integrated the Leaflet library to build a map displaying routes and markers, implemented custom map selection (OpenStreetMap) and dynamic route display. Enhanced frontend performance (React + Redux Toolkit) by eliminating redundant requests, fixing logic duplication and resolving display errors.
Frontend Developer
BEAUTYSYNC
2024 - 2025
Architected and implemented core CRM modules: employee management, client database, service catalog and product inventory system. Collaborated with designer, team lead and other team members to create modern, user-friendly interface improving salon staff productivity and system adoption. Integrated frontend (Next.js, React) with Python/PostgreSQL backend using RTK Query ensuring reliable real-time data synchronization.

Skills

solidity
full-stack
english
ukrainian