Адріан

ADRIAN MOSKALIYK
Full-Stack Engineer (Next.js · React · Node.js)
5 years experience · Ukraine, Remote (GMT+3) · English: B2
[відкрити контакти](див. вище в блоці «контактна інформація») · [відкрити контакти](див. вище в блоці «контактна інформація») · github.com/Masoty · t.me/Masoty

SUMMARY
Full-Stack Engineer with 5 years of experience building and scaling web products in Web3 and EdTech with
Next.js, React, TypeScript, Node.js and NestJS. Self-taught developer with hands-on commercial experience. Cut
initial page load from 6.1s to 2.3s, built a Telegram tap-to-earn app for 50k+ daily users, led a 12-month migration
of a 2018 legacy codebase to a modern stack, integrated crypto wallets and transaction signing across three Web3
projects (Ethereum, Solana, Tron, BNB Chain). Shipped a production EdTech platform solo using AI-assisted
workflows. Mentored junior developers through code review; worked in teams of 6 to 20+.

CORE COMPETENCIES
• Architecture & legacy modernization — Designed architectures from scratch (Entangle, Magnet,
AllEyesOnU) and rebuilt the frontend and backend of a large legacy platform: React class components to
functional, JavaScript to TypeScript, Express to NestJS, Webpack to Vite.
• Performance & SEO — Cut initial page load from 6.1s to 2.3s with lazy-loaded components, reduced database
load with Redis caching and queues, and improved search rankings through technical SEO.
• Backend & APIs — REST and GraphQL APIs in NestJS, Express and FastAPI, Redis-based load handling for
peak traffic, WebSocket integration, JWT / OAuth2 / session authentication, role-based access for 6 roles with
impersonation, Elasticsearch search, PDF report generation at 1000+ concurrent requests.
• Web3 & product platforms — Wallet integrations and transaction signing in three projects (Wagmi, Ethers,
WalletConnect) on Ethereum, Solana, Tron and BNB Chain; subscription platforms for AI trading bots and live
crypto quotes (10k+ and 1k+ users); a Telegram tap-to-earn app for 50k+ daily users.
• Quality & testing — Unit, integration and e2e tests, a test architecture on NestJS, CI/CD setup and test
automation.
• AI-assisted development — Cursor, MCP, Claude and AI agents in daily delivery, governed by strict Clean
Architecture rules.
• Collaboration — Mentored 3 junior developers through code review and pull-request feedback, worked in
teams of 6 to 20+, and took product ideas from proposal to production.

TECHNICAL SKILLS
Languages: TypeScript, JavaScript (ES6+), Python, HTML5, CSS/SCSS
Frontend: React, Next.js, Redux, RTK Query, Zustand, MobX, shadcn/ui, Tailwind CSS, Stitches, MUI, Ant
Design, Vite, Webpack
Backend: Node.js, NestJS, Express, FastAPI, REST, GraphQL (Apollo Client), WebSocket, JWT, OAuth2, Session
auth
Data: PostgreSQL, MongoDB, Redis, Elasticsearch, SQLAlchemy, Prisma
Web3: Wagmi, Ethers, WalletConnect, wallet integration, transaction signing; networks: Ethereum, Solana, Tron,
BNB Chain
Testing & DevOps: Jest, e2e testing, AWS (S3), Docker, Nginx, CI/CD, Git, GitLab
AI tooling: Cursor, MCP, Claude, AI agents

PROJECTS
AI-NATIVE EdTech PLATFORM
Production EdTech platform · Next.js, NestJS, PostgreSQL, AWS
• Delivered the platform solo using AI agents under strict Clean Architecture governance
• Led a 12-month migration of a 2018 legacy codebase to a modern stack

EXPERIENCE
CONNECTYCUBE · Full Stack Developer 02/2025 – 10/2026 · 1 yr 9 mos
Large web platform with role-based access, PDF reporting and job search · team of 6 · Middle-level role
• Rewrote a large legacy project on a modern stack: React class components to functional, JavaScript to
TypeScript, legacy forms to shadcn/ui, build moved to Vite
• Added lazy-loaded components, cutting initial page load from 6.1s to 2.3s and improving performance and UI
accessibility for users with limited abilities
• Migrated the backend from JavaScript/Express to TypeScript/NestJS and rebuilt backend and frontend
architecture to high standards
• Fixed backend vulnerabilities and raised throughput; added Redis caching and queues next to PostgreSQL,
reducing database load and requests

• Built a role system for 6 roles with authentication per role and user impersonation
• Developed an admin panel (API and UI) for managing 10k+ users
• Rewrote generation of 20+ PDF reports and optimized PDF print generation for 1000+ concurrent generations
• Developed job search on Elasticsearch
• Automated testing: e2e and unit tests, plus a test architecture on NestJS; set up and maintained CI/CD
• Integrated AWS S3 for media storage and asset management
• Mentored a junior developer: code review, pull-request feedback and guidance to keep the project stable
• Results: 6k+ daily active users; user satisfaction up from 30% to 87% and bug/instability rate down from 40% to
10% (user surveys); proposed improvements taken from idea to production
Tech: Next.js, TypeScript, React, Vite, shadcn/ui, Redux, React Router, NestJS, PostgreSQL, Redis, Elasticsearch, AWS S3,
Jest, CI/CD
ENTANGLE · Frontend Web Developer 05/2022 – 01/2025 · 2 yr 9 mos
Web3 and crypto products: marketing landings and subscription platforms · team of 20+ · Middle-level role
• Designed the project architecture from scratch for scalability and long-term development
• Built 4 interactive landing pages with complex scroll-driven animations (example: masoty.github.io)
• Built from scratch a subscription platform giving users access to AI trading bots that make predictions on
Polymarket (1k+ users)
• Built from scratch a subscription platform delivering fast, accurate crypto quotes from exchanges worldwide
(10k+ users)
• Integrated crypto wallets and built a transaction-signing system across three projects with Wagmi, Ethers and
WalletConnect on Ethereum, Solana, Tron and BNB Chain
• Mentored 2 junior developers: reviewed pull requests and fixed code to keep the projects stable while they
grew
• Optimized loading speed and performance; did SEO and technical optimization, improving search rankings
Tech: Next.js, TypeScript, React, Vite, Wagmi, Ethers, WalletConnect, GraphQL, SCSS
MAGNET 02/2023 – 04/2024 · 1 yr 3 mos · Part-time
Telegram tap-to-earn app: users tap Magnet coins, to be converted into a real exchange-listed cryptocurrency ·
50k+ daily users
• Developed the Telegram Web App for 50k+ daily active users, with the frontend, UI and page load speed
• Built the backend on Python, FastAPI and SQLAlchemy: database access, balances and tap accounting,
compatible with the main Magnet website
• Designed for peak load from the start: taps accumulate in Redis and are written to the database after 5 minutes
of user inactivity, avoiding a database write per tap
• Designed architectural solutions for a scalable, maintainable system
Tech: Python, FastAPI, SQLAlchemy, Redis, Next.js, TypeScript, React, MongoDB
ALLEYESONU 10/2022 – 02/2023 · 4 mos · Part-time
Website with an admin panel, API and Telegram bot
• Built a website and its architecture from scratch
• Developed an admin panel for managing the site and sales
• Built an API on FastAPI, since the site previously used only static content
• Developed a Telegram bot for user notifications and feedback
• Designed the MongoDB schema and data operations; did SEO optimization to improve visibility and search
rankings
Tech: Python, FastAPI, Next.js, React, TypeScript, SCSS, Tailwind CSS, MongoDB