Senior Java Backend Engineer - Wallet & Web3

OKX; Hong Kong; On-site; HKD 900,000 - 1,500,000; Full time

Benefits offered by this job

Competitive total compensation

Comprehensive insurance coverage for你

More benefits to be discussed afteryou

Job summary

OKX Wallet is OKX's self-custody wallet, built to securely store and manage on-chain assets for users worldwide. We seek a Staff/Senior Java Engineer to own core backend modules and drive high-concurrency wallet features.

You'll work across multi-chain environments (EVM, Tron, Solana) and apply sound engineering judgment, system design, and security awareness to deliver reliable wallet services.

Qualifications

• 5–10 years of Java backend experience with strong fundamentals.
• Experience with high-concurrency or complex systems; idempotency, retries, caching, and distributed locks.
• Understanding of blockchain/wallet concepts and at least one of EVM, Tron, or Solana.
• Strong security awareness around private keys, signing, and data protection.
• Able to diagnose live issues via logs, metrics, and tracing.
• Willingness to use AI coding tools and judge AI output for correctness.

Responsibilities

• Own core wallet backend modules such as address management, asset synchronization, transaction construction, broadcasting, on-chain confirmation, gas estimation, nonce management, and transaction-state tracking.
• Build transaction and on-chain interaction scenarios including transfers, token approvals, contract interactions, cross-chain, swaps, and DApp connections.
• Support multi-chain and new-chain integration, onboarding new public chains and asset standards, and handle differences in address models and transaction structures.
• Ensure stable operation with monitoring, alerting, rate limiting, retries, data reconciliation, and root-cause fixes.
• Drive projects end-to-end, coordinating with product, QA, frontend, and infrastructure teams and resolving dependencies and blockers.
• Continuously raise engineering quality via design discussions, code reviews, and documenting decisions and learnings.
• Apply AI in daily development using AI tools to assist with code, tests, review, troubleshooting, and documentation.

Skills

Java backend fundamentals

System design

Cognitive ability

Drive and ownership

Blockchain or wallet experience

High security awareness

Independent production troubleshooting

Engineering in the AI era

Tools

Spring Boot

Spring Cloud

MyBatis

Job description

OKX Wallet is OKX's self-custody wallet, built to securely store and manage on-chain assets for users worldwide. We seek a Staff/Senior Java Engineer to own core backend modules and drive high-concurrency wallet features.

You'll work across multi-chain environments (EVM, Tron, Solana) and apply sound engineering judgment, system design, and security awareness to deliver reliable wallet services.