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jefflcy/README.md

Hi, I’m Jefferson πŸ‘‹

Your fun Backend Engineer in the office that loves spawning ideas and shipping.

I like building web3 stuff with clean interfaces for both devs and users, like dApps, adapters, on-chain indexers, and more.


πŸ“š Final Year Student majoring in Business Analytics at NUS School of Computing πŸ‡ΈπŸ‡¬ πŸ’»

πŸ‘¨πŸ½β€πŸ³ Co-Director of NUS FinTech Society (Blockchain Club) ⚑️


What I enjoy working on

  • Chain & Infra

    • Contributed to a CosmosSDK L1 to improve PostgreSQL DB persistence writes
    • Fixed a consensus-breaking bug involving optimistic execution and reruns of failed txs
  • DEX, Adapters, and Cross-Chain

    • Built an adapter for a Perp DEX aggregator to enable cross-chain USDC deposits/withdrawals
  • Indexing & Data Visualizations

    • Built an onchain events indexer for a money markets dApp
    • Built a dashboard to visualize Lighter's LLP performance
β€”β€”β€” ✦ β€”β€”β€”

Tech stacks I'm proficient in

  • Languages

TypeScript Go Solidity Python Java R SQL

  • Infra/DB

PostgreSQL MongoDB Redis

  • Web/Backend

Node.js Express Flask GraphQL FastAPI

  • Web3 Tooling

Viem TypeChain Hardhat Truffle Ethers.js

  • Frontend

React Next.js HTML CSS Vue.js Tailwind Vite

  • Ops

Git systemd Google Cloud VM

  • Data Viz

Tableau

β€”β€”β€” ✦ β€”β€”β€”

How I like to work

  • Remote, wherever possible (I love offices with great vibes too; usually I bring the ✨vibes✨)
  • Ship small, testable units then measure performance
  • Prefer explicit data models/events and idempotent jobs
  • Stong advocate for proper logging and coding best practices
β€”β€”β€” ✦ β€”β€”β€”

Find me here too

β€”β€”β€” ✦ β€”β€”β€”

Pinned Loading

  1. eth-oxford-2025 eth-oxford-2025 Public

    Submission for ETH Oxford 2025 hackathon: A P2P Crypto On/Off Ramp using Flare Networks's FDC for off-chain data attestations.

    JavaScript 1 1

  2. cosmos-sdk cosmos-sdk Public

    Forked from Switcheo/cosmos-sdk

    ⛓️ A Framework for Building High Value Public Blockchains ✨

    Go

  3. Switcheo/demex-client Switcheo/demex-client Public

    Easy to use typescript client for trading perpetuals

    TypeScript 1 1

  4. wr1159/basedpay wr1159/basedpay Public

    Submission for BaseSEA hackathon: A payment service for Singapore Merchants via QR Code

    TypeScript 1

  5. wr1159/ethsg2024 wr1159/ethsg2024 Public

    TypeScript 1 1