Blockchain & Full Stack Engineer

JACK ONG

Senior Engineer at OKX specializing in building high-performance DeFi solutions, scalable blockchain infrastructure, and sophisticated Web3 experiences.

View Experience
Journey

Professional Experience

OKX

Engineer II, Blockchain Analysis Team

July 2023 – Current
  • Integrated more than 250 DeFi projects into the OKX Wallet across networks like Ethereum, Solana, and Sui, valued at over $5B TVL.
  • Designed and built an internal smart contract analysis tool to streamline development, quadrupling average integration speed.
  • Developed a decoding library to parse Borsh layouts for Solana accounts, currently used by multiple engineering sub-teams.

Hex Trust

Senior Full-stack Engineer

March 2023 – June 2023
  • Led the Frontend team to build Hex Safe 3.0, a bank-grade custodial solution used by hundreds of institutional customers.
  • Integrated XRP Ledger into backend infrastructure, involving changes to GoLang and TypeScript microservices.
  • Developed a Blockchain Bridge Service for monitoring transaction statuses and active nonce management.

Hex Trust

Full-stack Engineer

August 2022 – February 2023
  • Implemented end-to-end KYC user flow with document verification, reducing customer onboarding time by 50%.
  • Integrated WalletConnect, resulting in a 30% increase in cross-application transactions.
  • Led UI revamp of the Web3 Custodial wallet, increasing user engagement by 25% and retention by 15%.

Flurry Finance

Smart Contract Developer

April 2022 – August 2022
  • Optimized gas consumption by 50% through mathematical operation improvements for on-chain functions.
  • Supported Avalanche chain and Pangolin DEX integration, increasing protocol liquidity.
  • Implemented ERC1167 minimal proxies for gas-efficient smart contract cloning.
  • Automated CI/CD flows using GitHub Actions and Docker, removing manual deployment steps.
Capabilities

Tech Stack

Languages

TypeScriptJavaRustSolidityPythonC++SQLGoLang

Technologies

ReactNode.jsSpringBootKafkaRedisethers.jsHardhatTerraformDocker
Academic

Education

Hong Kong University of Science and Technology

Bachelor’s in Engineering – Computer Science

Sept 2017 - June 2021
Key Coursework
  • OOP in C++
  • Algorithms & Data Structures
  • Operating Systems
  • Machine Learning
  • Deep Learning in Computer Vision
  • Cloud Computing

Focused on low-level systems, distributed computing, and artificial intelligence.

Let's build the future.

I'm always open to discussing blockchain integration, high-stakes engineering projects, or technical consulting.

Location

Hong Kong / Remote

© 2025 Jack Ong. All rights reserved. Built with passion for Web3.