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: πΊπ¦ Ukraine
Residency: πΊπ¦ 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