felisvad.dev

Vadym Kotov

Tech Lead & Blockchain Architect

Web3 · DeFi · Fintech · remote, Europe (CET)

this page, but for

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6.2 years in production
(counter is live, like my systems)
15+ products shipped
DeFi · NFT · P2E · fintech
12+ engineers led
hired, onboarded, reviewed
10+ chains I build on
anything EVM, plus Solana

~/work

  1. Co-founder & CTO @ DESH Group

    Jun 2025 - now

    Web3/AI product studio · remote

    • Co-founded the studio; own technical strategy and delivery from first idea to launch.
    • Architect DeFi, NFT, P2E and fintech systems; make the key engineering calls.
    • Lead backend, frontend and UI/UX across a team of 12+, running code review and keeping delivery on track.

  2. Interim CTO / Tech Lead @ Cipher Core

    Feb 2024 - now

    4 blockchain products · remote

    • Lead engineering across Play-to-Earn, Solana P2E and DeFi products, from build toward scale.
    • Designed high-performance backends integrated with smart contracts and cut transaction latency by ~40%.
    • Architected across Solana and Ethereum with distributed-systems and applied-cryptography foundations.

  3. Backend Engineer @ Noloyolo

    Apr 2024 - Dec 2024

    Singapore · remote

    • Led a full backend re-architecture into clean microservices, cutting coupling across the system.
    • Introduced gRPC and Zod for type-safe, validated service communication; rebuilt the codebase on SOLID.

  4. Backend Engineer @ Polyway

    Aug 2023 - Apr 2024

    United States · remote

    • Designed and launched a secure, scalable backend architecture from scratch.
    • Led integrations with crypto exchanges and Gnosis Safe wallets.
    • Built CI/CD pipelines that cut deployment time; hired and onboarded backend engineers.

  5. Backend / Blockchain Engineer @ Lazy Ants

    Dec 2022 - Jul 2023

    remote

    • Built a production cross-chain smart-contract bridge for a large organization.
    • Delivered and documented 3 DeFi products, leading and delegating to backend developers.

  6. Blockchain / Node.js Engineer @ Another Dev

    Oct 2021 - Dec 2022

    Cyprus · remote

    • ICW (P2E): backend and smart contracts for a project recognized at Crypto Expo Dubai.
    • Mine Barons (P2E), Bithotel / Cyber Girl (NFT marketplaces): full backend + contracts with secure minting.
    • Built a launchpad factory with DAO governance, an NFT lottery with whitelisting, and a DeFi yield protocol.

  7. Backend Developer @ Linktone.pro

    May 2020 - Sep 2021

    Cyprus · remote

    • Built a music streaming platform backend from the ground up; owned Nginx and DevOps.

~/skills

blockchain

  • Ethereum / Solidity
  • EVM chains & L2s
  • Solana
  • smart contracts
  • DeFi protocols
  • NFT systems
  • P2E
  • cross-chain bridges
  • tokenization
  • DAO mechanics
  • provably-fair systems

backend

  • Node.js
  • TypeScript
  • microservices
  • gRPC
  • Zod
  • REST APIs
  • distributed systems
  • event-driven architecture
  • SOLID
  • clean architecture

infrastructure

  • CI/CD
  • Docker
  • Nginx
  • DevOps
  • high-load optimization
  • security hardening
  • exchange & wallet integrations
  • Gnosis Safe

leadership

  • technical leadership
  • architecture ownership
  • hiring & onboarding
  • code review
  • cross-functional teams
  • MVP-to-scale delivery
  • stakeholder communication

~/education

~/contact

Email is the fastest way to reach me. Telegram is a close second.