Senior/Staff Java Engineer, Fraud Risk

As a Senior/Staff Java Engineer on OKX's Fraud Risk team, you will have early and significant impact on the engineering team. You will be responsible for implementing and supporting backend microservices, working closely with frontend and cross-functional teams to coordinate complex deliverables, and researching solutions for fraud detection across real-time monitoring, event data streaming, A/B testing, and a full feature risk ecosystem.

What you'll do

• Design and develop 24/7 high-scale APIs and distributed systems on Alicloud/AWS
• Implement backend microservices for real-time fraudulent monitoring with highly configurable rules
• Build event data stream ingestion systems that support near real-time fraud rules setup
• Develop advanced A/B testing capabilities so customers can leverage greedy algorithms to fight fraud
• Work on powerful tools and data science-driven solutions for business users
• Write unit tests, integration tests, and CI/CD scripts
• Own, monitor, and improve services in production
• Develop and test high-quality product features spanning multiple domains
• Collaborate with engineering managers, architects, engineers, and QA to develop innovative solutions that meet market needs with regard to functionality, performance, reliability, and adherence to development goals
• Act as a technical leader, research and promote new technologies and tools
• Address technical challenges including performance, fault-tolerance, security, and live production issues
• Influence every step of the service lifecycle

What you bring

• Minimum 5+ years of software development experience
• Deep proficiency with Java and the JVM, including memory/performance tuning and garbage collection
• Solid foundation in JVM configuration optimisation strategies, IO, multi-threading, concurrency frameworks, common data structures, algorithms, and design patterns
• Experience developing web services, SOA, REST APIs, message queues, and distributed/scalable architectures
• Proficiency with Spring Framework (Spring Boot), Hibernate or similar ORM, Maven, and Git
• Strong computer science fundamentals, solid knowledge of OOP/OOD, and GoF design patterns
• Experience with MySQL, Oracle, and other databases, with in-depth understanding of transactions, locks, indexes, database and SQL optimisation, and design methods such as sub-database sub-table and leader/follower synchronization
• Familiarity with common middleware such as Kafka, ELK, and Hologres
• Deep understanding of the design principles of common caching systems such as Memcached and Redis, with ability to accurately choose caching solutions
• Good understanding of distributed system principles, including CAP, consistency, and idempotent operations
• Ability to work well in a team environment and effectively drive cross-team solutions with complex dependencies
• Results-oriented, self-learner, and problem solver with a can-do attitude
• Clear logic, quick thinking, and good communication skills
• Bilingual proficiency in Mandarin and English is highly preferred, as the team works with stakeholders in different regions

Nice to have

• Expertise in or eagerness to become an expert in the blockchain and cryptocurrency landscape, understanding how speculators, traders, digital asset exchanges, blockchain money services businesses, and financial institutions operate
• Experience working in disruptive technology and successfully launching products, ideally within FinTech, eCommerce, SaaS, AdTech, or Digital Wallet
• A track record of being strategic, analytical, and execution-oriented
• Familiarity with product management processes and tools
• Experience working with teams across different time zones

What we offer

• Competitive total compensation package
• 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 trusted by hundreds of large institutions seeking access to crypto markets and is backed by Proof of Reserves. Part of OKG, the group brings blockchain value to users worldwide through products including OKX, OKX Wallet, and OKLink.