Senior Java Backend Engineer - Wallet & Blockchain

OKX; Singapore; On-site; SGD 120,000 - 180,000; 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 seeking a Senior Java Engineer to own core backend modules for our multi-chain wallet platform. You will build and optimize address management, asset synchronization, transaction construction, broadcasting, on-chain confirmation, gas estimation, nonce management, and state tracking.

We value strong Java fundamentals, system design, and ownership. You will work across teams to deliver robust, scalable services, support cross-chain integrations, and proactively improve reliability

Qualifications

• 5–10 years of Java backend experience with solid fundamentals.
• Strong system design ability for high-concurrency environments.
• Independent ownership of modules from design to launch.
• Experience with wallets, blockchain, or on-chain systems is a plus.
• Security-conscious with private-key and signing workflows.

Responsibilities

• Own core wallet backend modules and ensure stability.
• Build and optimize address management, asset sync, and transaction flow.
• Implement on-chain interaction scenarios: transfers, approvals, signers, cross-chain.
• Support multi-chain integrations and new assets with robust design.
• Drive reliable operation with monitoring, retries, and incident response.
• Collaborate across product, QA, infra, and frontend teams.

Skills

Java

Spring Boot

Distributed systems

Backend architecture

Performance optimization

Code reviews

Tools

Spring Cloud

MyBatis

JVM tuning

Git

Job description

OKX Wallet is seeking a Senior Java Engineer to own core backend modules for our multi-chain wallet platform. You will build and optimize address management, asset synchronization, transaction construction, broadcasting, on-chain confirmation, gas estimation, nonce management, and state tracking.

We value strong Java fundamentals, system design, and ownership. You will work across teams to deliver robust, scalable services, support cross-chain integrations, and proactively improve reliability