Senior / Staff Engineer, DEX Trading System

As a Senior or Staff Engineer at OKX, you will design, build, and scale the backend systems powering OKX's DEX trading products. You will 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 will deliver secure, reliable trading experiences across multiple blockchain ecosystems. This is a hands-on role with meaningful architectural ownership and opportunities to grow into technical leadership.

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, defining clear order and transaction state models with robust handling of retries, duplicate requests, partial failures, and recovery.
• Ensure trading services remain reliable under high concurrency, traffic spikes, and degraded external dependencies by implementing 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.

What we offer

• Competitive total compensation package
• Learning and development programs and education subsidy for your 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. OKX is backed by Proof of Reserves and trusted by hundreds of large institutions seeking access to crypto markets. OKX is part of OKG, a group bringing blockchain value to users worldwide through products including OKX, OKX Wallet, OKLink and more.