Senior Staff Engineer Fraud Risk

Who We Are

At OKX, we believe that the future will be reshaped by crypto, and ultimately contribute to every individual's freedom. OKX is a leading crypto exchange, and the developer of OKX Wallet, giving millions access to crypto trading and decentralized crypto applications (dApps). OKX is also a trusted brand by hundreds of large institutions seeking access to crypto markets. We are safe and reliable, backed by our Proof of Reserves.

Across our multiple offices globally, we are united by our core principles:
We Before Me, Do the Right Thing, and Get Things Done. These shared values drive our culture, shape our processes, and foster a friendly, rewarding, and diverse environment for every OK-er. OKX is part of OKG, a group that brings the value of Blockchain to users around the world, through our leading products OKX, OKX Wallet, OKLink and more.

We’re looking for a Software Engineer to join our Fraud Risk team! This role will provide an early and significant impact on the engineering team. You will be expected to be responsible for such areas as implementation and support of backend microservices, working closely with the frontend and cross‑functional teams to coordinate complex deliverables, do research and provide meaningful feedback about any decision being made within the team.

• Real‑time fraudulent monitoring with highly configurable rules
• Event data stream ingestion which supports near real‑time fraud rules setup
• Advanced A/B testing capabilities for our customers so they can leverage greedy algorithms and fight fraud
• Powerful tools and innovative data science driven solutions for business users
• Full feature risk ecosystem

• Proficiency with Java stack and JVM (memory/performance tuning, GC)
• Proficiency with developing Web Services, SOA, REST APIs, Message Queue, Distributed/Scalable Architecture
• Proficiency in Spring Framework (Spring Boot), Hibernate (or similar ORM), Maven, Git
• Design and develop 24/7 high‑scale APIs and distributed system, the tech stack will be on Alicloud/AWS
• Strong CS fundamentals, solid knowledge of OOP/OOD, GoF design patterns
• Write unit tests, integration tests and CI/CD scripts
• Own, monitor and improve our services in production
• Development and testing of high quality product features spanning multiple product domains
• Work with engineering managers, architects, engineers & QA to develop innovative solutions that meet market needs with respect to functionality, performance, reliability, realistic implementation schedules and adherence to development goals and principles
• Be a technical leader; research and promote new technologies and tools
• Face technical challenges – performance, fault‑tolerance, security and live production issues
• Be involved throughout our service life cycle, influence every step of the way

• Min. 5+ years of experience in Software Development
• Solid foundation in Java, with deep understanding of JVM configuration optimisation strategies and tuning, IO, multi‑threading, concurrency frameworks, common data structures, algorithms and design patterns
• Good programming specifications and rich work experience
• Familiar with mainstream open‑source application frameworks such as Spring Boot, SpringMVC, Mybatis, Spring Cloud, etc.
• Experience with MySQL, Oracle and other databases, with an in‑depth understanding of things, locks, indexes, database and SQL optimisation, design methods such as sub‑database sub‑table, leader/follower synchronization
• Familiar with common middleware such as Kafka, ELK, Hologres, etc.
• Deep understanding of design principles of common caching systems such as Memcached, Redis, etc. and be able to accurately choose caching solutions
• Good understanding of distributed system principles, including CAP, consistency, idempotent operation, etc.
• Work well in a team environment and effectively drive cross‑team solutions that have complex dependencies and requirements
• Results‑oriented, self‑learner, problem solver with ‘can do’ attitude
• Clear logic, quick thinking and good communication skills
• Bilingual highly preferred (Mandarin and English) as the team will be working with…