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. About The Opportunity 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. Following are some domains you will have opportunities to work with: • 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 user • Full feature risk ecosystem What You’ll Be Doing • 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 w.r.t 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 What We Look For In You • Min. 5+ years of experience in Software Development • Possess a solid foundation in Java, with a 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 SpringBoot, SpringMVC, Mybatis, SpringCloud, 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 Kakfa, ELK, Hologres, etc. • Possess a deep understanding of the design principles of common caching systems, such as Memcached, Redis, etc. and be able to accurately choose caching solutions • Have a good understanding of distributed system principles, including CAP, consistency, idempotent operation, etc. • Work well in a team environment and be able to 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 is highly preferred (Mandarin and English) as the team will be working with stakeholders in different regions Nice-To-Have • Already or are eager to become an expert in the blockchain and cryptocurrency landscape and will understand how speculators, traders, digital asset exchanges, blockchain money services businesses and financial institutions operate • Experience working in a disruptive technology, successfully launching products, ideally, within FinTech, eCommerce, SaaS, AdTech, or Digital Wallet business experience • A history (and preference) of being both strategic, analytical and execution-oriented • Familiarity with product management processes and tools • Experience working with teams across different time zones Perks & Benefits • Competitive total compensation package • L&D programs and education subsidy for employees' growth and development • Various team building programs and company events • Wellness and meal allowances • Comprehensive healthcare schemes for employees and dependants • More that we love to tell you along the process! Please note that Hong Kong is a group-level service hub, and OKX does not carry on a business of operating a virtual asset trading platform in Hong Kong. Notice: All official OKX vacancies are published on this website. While roles may appear on selected third-party platforms from time to time, information on other sites may be inaccurate or outdated. If in doubt, please apply directly through our official careers website. Information collected and processed as part of the recruitment process of any job application you choose to submit is subject to OKX's Candidate Privacy Notice.