Hi, I’m Vadim (aka @ifelsedeveloper) — I build end‑to‑end blockchain products: smart contracts, indexing backends, and modern front‑ends. I’ve led and shipped NFT marketplaces, DEXes, and tooling across Ethereum, Solana, and Aptos. I enjoy clean architectures, deterministic deployments, and squeezing gas like it’s a sport.

• RARI cross‑chain bridge (LayerZero OFT) — Ethereum ↔ Base: contracts, adapter, and a minimal NestJS microservice (lz-bridge-service) plus a Next.js UI (ui-rari-bridge).
• Reward swap / liquidity automation — NestJS service integrating Uniswap v3 (AlphaRouter/QuoterV2) for scheduled swaps and cron‑driven flows.
• Gas‑efficient Solidity patterns — storage packing, memory‑safe assembly, proxy patterns, CREATE2/CREATE3 deterministic deploys.

I love turning messy multi‑chain flows into simple, reliable CLIs and services.

• Rarible — Tech lead & smart‑contract engineer for EVM/Solana/Aptos: primary sales, marketplace, indexers, and UI SDK packages.
• DEX (EVM) — Designed and delivered core contracts and The Graph APIs for a farming DEX (SwapTasteNFT).
• Minter Browser / Blockmint — Architected data‑heavy pipelines, CI/CD, and crypto monetization flows.
• Tradespoon / HFT tools — Market‑data pipelines and forecasting (CBOE/CME protocols), mobile apps, and analytics.

Conferences & community: NFT Paris, NFT Lisbon (2022–2025), Web Summit 2018/2023, Paris Blockchain Week 2024, DevCon Bangkok 2024, multiple meetups & hackathons.

Chains: Ethereum, Solana, Aptos · Core: Solidity, Rust, Move, TypeScript, Python
Contracts: Foundry, Hardhat, Anchor, OpenZeppelin, ERC‑20/721/1155, ERC‑20Votes
Infra: NestJS, The Graph, Postgres, Redis, MongoDB, IPFS
DevOps: GitHub Actions, Docker, CI/CD, Terraform · Patterns: proxies, upgradeability, deterministic deploys
Data/Trading: Uniswap v3, market‑data processing, backtesting, automation

• LayerZero RARI OFT bridge — OFT token + Adapter on Ethereum, service (lz-bridge-service) and UI (ui-rari-bridge) for seamless ETH→Base transfers.
• Reward Swap Service — Cron‑driven swaps (WETH⇄RARI) with slippage controls and environment‑driven configs.
• Indexers & APIs — The Graph endpoints for DEX/NFT flows; infra & CI/CD from zero to production.
• Marketplace & primary sales — Multi‑chain smart contracts and SDKs for integrating NFT primitives into apps.

If you want a secure marketplace, a deterministic deploy pipeline, or a simple bridge UI that just works, that’s my jam.

• Rarible, Tech Lead / Senior Blockchain Developer — Sep 2022 → Present
• Blockmint Technologies, Tech Lead / Senior Software Architect — Jun 2017 → Jul 2023
• Velvetech LLC, Tech Lead / Senior Software Engineer — Dec 2012 → Sep 2022

Education: M.Sc. & B.Sc. in Applied Mathematics & Computer Science — Novosibirsk State Technical University

• Rarible — https://rarible.com/
• Xayo — https://www.xayoapp.com/
• Carbon Tokens Market — https://carbontokensmarket.com/
• Minter Browser — http://www.getminter.com
• Tradespoon — http://www.tradespoon.com

• Email: [email protected]
• LinkedIn: https://www.linkedin.com/in/vadim-fadeev/
• GitHub: https://github.com/ifelsedeveloper

If you’re building onchain infra (marketplaces, bridges, indexers, or clever trading tools), let’s talk.

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_{Last updated: September 05, 2025}