Full-Stack & Web3 Systems Engineer. I build the rails between regular users and on-chain settlement: smart accounts that don't need seed phrases, contracts that hold real investor capital, and the ledgers, indexers and fiat ramps that keep the off-chain side honest.

4+ years shipping production systems for tokenized private markets, retail token platforms, and DeFi marketplaces. Currently founding engineer at SphereHub.

• Tokenized private markets: factory-deployed escrow vaults for private placements with capital thresholds, deadlines, batched refunds and pro-rata distributions. Accredited investors fund $5k+ tickets in two clicks.
• Account abstraction (ERC-4337): gasless onboarding with Pimlico and Biconomy paymasters, email/OTP signers, and no seed phrases for non-crypto investors.
• Exchange & token infrastructure on Base: AMM with dynamic slippage bounds, on-chain KYC tiers ($10k–$1M/day), fixed-APY staking, and Chainlink FX oracles with Pyth fallback, serving 1,000+ retail users.
• Money-movement backends: idempotent financial ledgers, cron reconciliation of on/off-ramp (Transak) events, CDC streams into enterprise SQL, and OIDC/OAuth SSO across Web2 profiles and self-custodial smart accounts.
• Indexing & data: cross-chain ETL (Astar, Moonbeam), GraphQL/Subsquid indexers, and real-time portfolio dashboards built from on-chain event streams.
• Off-chain order books: EIP-712 signed-order matching that cut user gas spend by ~60%.
• Solana: tiered NFT pass platforms on Metaplex Core and Candy Machine, with token-gating APIs and admin tooling.

Solidity Foundry viem wagmi ERC-4337 EIP-712 SIWE Chainlink Pyth · TypeScript Next.js React Node.js FastAPI GraphQL · PostgreSQL Supabase MySQL Redis Docker Azure · Base Ethereum Polygon Solana

• compliant-token-exchange: retail token exchange on Base: ERC-4337 gasless accounts, fiat ramps, idempotent ledger, outbox/CDC sync
• compliant-amm-contracts: KYC-tiered AMM, slippage policy, fixed-APY staking, timelock; 133 tests, invariant suites
• private-placement-escrow: CREATE2 offering factory, phased pro-rata returns, refunds; audited and fixed
• solana-member-passes: tiered Metaplex Core passes, verified paid mints, token-gating API
• nox-credentials: soulbound (ERC-5192) verifiable credentials with SIWE auth and per-recipient encrypted sharing. Includes a v2 security audit of my own code; 100% contract coverage.
• space-marketplace: Harberger-style streamed subscription memberships for DAOs. Contract audit and rewrite (5 bugs fixed, each with a regression test), plus fuzz and invariant suites.
• dotsama-exchange-contracts: EIP-712 NFT order book on Astar and Moonbeam, with protocol fees shared to badge stakers
• dotsama-multichain-indexer: Subsquid ETL indexing an NFT exchange across Astar and Moonbeam into one GraphQL API

LinkedIn · adilyasin205@gmail.com · open to senior full-stack / web3 roles and contracts