Senior / Staff Engineer, DEX Trading System

As a Senior or Staff Engineer at OKX, you design, build, and scale the backend systems powering OKX's DEX trading products. You own critical parts of the trading lifecycle-from quote discovery and order management to transaction submission, execution tracking, and reconciliation. Working closely with product, frontend, smart contract, and infrastructure teams, you deliver secure, reliable trading experiences across multiple blockchain ecosystems in a hands-on role with meaningful architectural ownership.

What you'll do

• Design and develop backend services for quote aggregation, order management, transaction orchestration, and execution tracking
• Build reliable integrations with DEX protocols, liquidity sources, blockchain RPC providers, and indexing services, with clear order and transaction state models that handle retries, duplicate requests, partial failures, and recovery
• Ensure trading services remain reliable under high concurrency, traffic spikes, and degraded external dependencies through rate limiting, concurrency controls, resource isolation, and graceful degradation
• Optimize database access, transaction boundaries, caching, and asynchronous processing, and establish monitoring, alerting, load testing, and incident-response practices for critical trading flows
• Support trading workflows across multiple blockchain ecosystems, handling transaction submission, confirmation tracking, failed or dropped transactions, and chain reorganizations
• Build data synchronization and reconciliation mechanisms to maintain consistency between backend records and on-chain execution
• Translate product requirements into practical technical designs and production-ready services
• Own features through implementation, testing, rollout, and post-launch operation

What you bring

• 5+ years of professional backend engineering experience, including ownership of production systems
• Strong proficiency in Java and its backend ecosystem, with a solid understanding of concurrency, distributed systems, relational databases, caching, and messaging systems
• Experience building high-availability services and diagnosing performance or reliability issues in production
• Understanding of blockchain transactions, smart contract interactions, and common DeFi trading mechanisms
• Ability to independently drive a feature from technical design through production deployment, with strong ownership, sound engineering judgment, and effective cross-functional communication
• Current right to work in Singapore without requiring OKX visa sponsorship

What we offer

• Competitive total compensation package
• Learning and development programs and education subsidy for growth and development
• Various team building programs and company events
• Wellness and meal allowances
• Comprehensive healthcare schemes for employees and dependants

About OKX

OKX is a leading crypto exchange and developer of OKX Wallet, giving millions access to crypto trading and decentralized applications. Backed by Proof of Reserves, OKX serves hundreds of large institutions seeking access to crypto markets. Part of the OKG group, OKX operates globally with core values of We Before Me, Do the Right Thing, and Get Things Done.