Олександр

Alex Havrylov
Senior Full Stack Engineer
[open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · London, UK
(relocating September 2026)

PROFILE

Full Stack Engineer with 7+ years of production experience in TypeScript, React, and Node.js. Progressed from engineer to
Tech Lead and CTO, building and operating high-scale platforms in Web3, FinTech, and crypto-gaming. Most recently led
engineering on a Telegram-based crypto platform (TON ecosystem) that scaled to tens of millions of users — owning
architecture, hiring, on-call operations and partner integrations end to end. AI-native in practice: uses agentic tooling
(Claude Code) as a core part of daily engineering workflow, not as an experiment.

SKILLS

Frontend: TypeScript, React, Next.js, JavaScript (ES2022+), HTML5, CSS3, WebRTC, WebGL, PlayCanvas
Backend: Node.js, NestJS, REST APIs, GraphQL, Microservices, WebSockets
Blockchain / Web3: TON, Telegram Mini Apps, TON Connect, Smart Contracts (ERC-4626), Solidity
Infrastructure: AWS, Docker, CI/CD, PostgreSQL, Redis, RabbitMQ
AI & Tooling: Claude Code, agentic workflows, LLM integration, prompt engineering
Practices: System design, technical leadership, trunk-based development, incident response

EXPERIENCE

CTO · GraiTech Jun 2024 – Present | Remote
● Led engineering on a world-ranking Telegram crypto-gaming platform (TON ecosystem), scaling to tens of millions
of active users.
● Defined and executed technical strategy: microservice architecture, large RPS optimisation, and infrastructure
scaling.
● Managed and grew multiple engineering teams; set technical direction, conducted hiring, and owned engineering
culture.
● Introduced agentic AI development workflows (Claude Code), significantly reducing delivery time on feature cycles.
● Owned incident response and on-call for production systems operating at high throughput 24/7.

Full Stack Engineer / Tech Lead · Cryptonergy.finance Jun 2023 – Jun 2024 | Remote
● Built a DeFi yield farming platform from scratch, end to end — architecture, backend, and frontend.
● Developed Vault smart contract logic integrating multiple farming strategies using the ERC-4626 token standard.
● Translated abstract product vision into shipped features, working directly with business stakeholders.
● Led a small engineering team, setting technical standards and reviewing all production code.

Full Stack Engineer · Party.Space Sep 2021 – Apr 2023 | Remote
● Built a browser-based metaverse platform handling real-time multi-user virtual spaces.
● Implemented multi-stream video support (WebRTC, HLS) and custom data flow between PlayCanvas and backend
services.
● Integrated Web3 access control — NFT-gated entry to virtual spaces — using smart contract event listeners.

Team Lead / Frontend Engineer · BSG.WORLD Nov 2020 – Sep 2021 | Kyiv, Ukraine
● Promoted from Frontend Engineer to Team Lead within 7 months; led a frontend team of 4.
● Set code standards, ran code review, and coordinated delivery across product and design.

Frontend Developer · WizardsDev Feb 2020 – Oct 2020 | Kyiv, Ukraine
● Developed React-based client applications; contributed to component architecture and API integration.

Frontend Developer · Freelance Jan 2019 – Jan 2020 | Kyiv, Ukraine
● Built client websites and custom frontend scripts; developed bot automation logic for reporting and data pipelines.

EDUCATION

Kyiv National University of Trade and Economics 2017 – 2020
Bachelor's degree

LANGUAGES

English — Professional working proficiency · Ukrainian — Native

RIGHT TO WORK

Ukrainian visa scheme (Homes for Ukraine) — full right to work in the UK, no sponsorship required. Visa in process,
expected September 2026. Relocating to London.