Senior Java Engineer (Web3)

TL;DR

Senior Java Engineer (Web3): Building and optimizing scalable backend services for the OKX Wallet and payment infrastructure with an accent on EVM ecosystem integration and payment engineering. Focus on implementing Account Abstraction, optimizing transaction processing, and integrating high-performance chains like Solana and Aptos.

Location: Hong Kong, Hong Kong SAR

Company

A leading crypto exchange and developer of OKX Wallet, providing millions of users access to crypto trading and decentralized applications (dApps).

What you will do

• Lead the design and implementation of highly scalable, secure backend services for OKX Wallet and payment infrastructure.
• Build and maintain robust interfaces with the EVM ecosystem and high-performance chains such as Solana, Sui, and Aptos.
• Develop secure transaction processing systems merging traditional payment reliability with blockchain transparency.
• Act as a technical pillar by identifying and resolving complex production issues, performance bottlenecks, and security vulnerabilities.
• Drive the adoption of Account Abstraction (AA) and cutting-edge EIPs to enhance the DeFi user experience.

Requirements

• Extensive experience in Java development with a track record of managing high-traffic, mission-critical production environments.
• Deep expertise in the EVM ecosystem, including on-chain data structures, transaction lifecycles, and smart contract interactions.
• Familiarity with Go or Rust to support multi-language infrastructure.
• Strong passion for Crypto and DeFi, staying updated on latest trends and actively using dApps.
• Proactive ownership and the ability to thrive in a fast-paced, evolving environment.

Nice to have

• Understanding of Account Abstraction (ERC-4337), EIP-7702, or MPC/TSS wallet architectures.
• Hands-on experience with non-EVM chains like Solana, Sui, or Aptos.
• Prior background in traditional FinTech, clearing/settlement systems, or payment gateways.
• Ability to contribute to Rust or Go-based microservices.

Culture & Benefits

• Competitive total compensation.
• Comprehensive insurance coverage for employees and their dependants.
• A diverse and rewarding environment driven by principles of "We Before Me" and "Get Things Done".