Piyush Utkar

• Custom native ERC-20 (VEL), genesis config, and Docker devnet orchestration.
• Bridge calls OptimismPortal.depositTransaction and L2ToL1MessagePasser.initiateWithdrawal; UI resolves the full withdrawal lifecycle.
• Block explorer and faucet wired to the same chain spec.

Solidity · Foundry · OP Stack · React · Vite · ethers

• Async ingest: client → API → RabbitMQ → worker → Postgres, decoupled and retryable.
• Multi-tenant orgs/projects, per-project API keys, SlowAPI rate limiting, Alembic migrations.
• Full Docker Compose stack: Postgres + Redis + RabbitMQ + MinIO, with one-command bootstrap.

FastAPI · SQLAlchemy · Next.js 15 · RabbitMQ · Postgres · Redis

• Constant-product AMM with fee-on-transfer token, standalone LP vault.
• Deployed and verified on Sepolia Etherscan at 0x476D…8564.
• On-chain transaction history fetched directly from Swap events.

Solidity · Hardhat · OpenZeppelin · React · Vite · ethers

• Atomic OCO rollback path; polling for tx finalization with secret-scrubbing logs.
• Multi-chain menus (USDT/ETH/SOL/BNB) with gas preflight and slippage handling.
• Used by a client workflow on Request.Finance invoicing rails.

Node.js · Mayan SDK · DFNS · ethers · Solana web3.js

• pipe-shell: POSIX-ish command interpreter, 62 assertions across 17 cases.
• arena-allocator: bump arena, 5–14× faster than malloc for small allocations.
• bst-library: generic BST, ~3.5M insert/s, ~4.5M find/s.

C11 · POSIX · x86-64 · Make · GitHub Actions

• 155 tests, 92% coverage on bot/, CI on Python 3.11 / 3.12 / 3.13.
• Secret scrubbing at log-emit time (signature, apiKey, apiSecret).
• Clock skew tolerance via /fapi/v1/time probe and recvWindow config.

Python · HMAC-signed REST · pytest · mypy · ruff · GitHub Actions