i build defi and backend systems.i learn how they break.

Self-hosted Go service that tracks stablecoin transfer finality directly off the chain's finalized RPC tag instead of a guessed confirmation depth. Detects reorgs and recovers by walking back to the last block both chains agree on, then fires a signed HMAC-SHA256 webhook the instant a transfer is truly final. State persists to local SQLite for crash-safe restarts. Scoped deliberately to stablecoins only — no price oracle, no volatility between 'seen' and 'final', so 'safe to act on' is a guarantee that actually holds. No custody, no key management: it registers addresses you already control and watches them. 22 tests simulate reorgs on a fake chain; 79–84% statement coverage on the core packages.

Built an HTTP/1.1 server directly on top of TCP, no net/http. Hand-wrote a streaming request/header parser with case-insensitive headers per RFC 9110, a response writer supporting fixed-length responses, chunked transfer encoding, and trailers, and a small reverse proxy that streams httpbin.org responses back chunk by chunk. Each connection runs on its own goroutine. The point wasn't to replace net/http, it was to actually understand what it's doing underneath by writing the wire-format handling myself. Parser tested against reads split across arbitrary byte boundaries so it never assumes a request arrives whole; 85–90% statement coverage.

Built Prism for the Uniswap Hook Incubator Cohort #9 hackathon. A v4 hook that splits every LP deposit into LP-Y (zero IL, pure fee yield) and LP-D (absorbs IL, backed by USDC collateral). Protocols bid for LP-D on an on-chain order book — auto-filled atomically inside afterAddLiquidity. IL computed oracle-free using sqrtPrice at entry vs exit. Automated settlement via a Reactive Network RSC on Lasna that watches swaps cross-chain and fires callbacks — no keepers, no cron. 66/66 Foundry tests, 6 contracts across 2 chains, full dApp live on Unichain Sepolia.

First real engineering role. Pre-mainnet high-frequency derivatives protocol — auth systems, core backend infrastructure, shipping fast in a codebase that doesn't wait for you. TypeScript, Node.js, React. The kind of codebase where you learn more in a week than in a month of solo projects.

Self-improving DeFi agent with verifiable reasoning and on-chain reputation. 3-step LLM pipeline (Researcher → Strategist → Critic) with OpenRouter attestation IDs, MongoDB evidence bundles, and 0G Chain contracts for agentId + reputation tracking. The core insight: every strategy evolution explicitly cites prior failures, making learning provable. Built the full stack from KeeperHub integration to contract deployment on 0G Galileo testnet. Didn't place in judging, but the infrastructure for trustworthy DeFAI is solid.