OKX

Venture capital for blockchain startups

Senior/Staff Java Engineer - Fraud Risk

Backend EngineeringConfirmed live in the last 24 hours

Full-timeSingaporeNo salary listedIn-person

About the Job

Requirements

Proficiency with the Java stack and JVM, including memory and performance tuning and garbage collection.
Proficiency in developing web services, service-oriented architecture, REST APIs, message queues, and distributed and scalable architecture.
Proficiency in Spring Framework (Spring Boot), Hibernate or a similar object-relational mapping tool, Maven, and Git.
Strong computer science fundamentals and solid knowledge of object-oriented programming and design, and Gang of Four design patterns.
At least 5 years of software development experience.
A solid foundation in Java, with a deep understanding of JVM configuration optimization and tuning strategies, input/output, multithreading, concurrency frameworks, common data structures, algorithms, and design patterns.
Familiarity with mainstream open-source application frameworks such as Spring Boot, Spring MVC, MyBatis, and Spring Cloud.
Experience with MySQL, Oracle, and other databases, including database locks, indexes, database and SQL optimization, and design methods such as database sharding and leader-follower synchronization.
Familiarity with common middleware such as Kafka, ELK, and Hologres.
A deep understanding of common caching system design principles, including Memcached and Redis, and the ability to select caching solutions.
A good understanding of distributed system principles, including CAP, consistency, and idempotent operations.
Ability to work in a team environment and drive cross-team solutions involving complex dependencies and requirements.
Clear logical thinking, quick thinking, and good communication skills.

Responsibilities

Implement and support backend microservices, coordinating complex deliverables with frontend and cross-functional teams, researching decisions, and providing meaningful feedback.
Design and develop high-scale, 24/7 APIs and distributed systems using Alicloud or AWS.
Write unit tests, integration tests, and continuous integration and continuous delivery scripts.
Own, monitor, and improve services in production.
Develop and test high-quality product features spanning multiple product domains.
Work with engineering managers, architects, engineers, and quality assurance to develop solutions that meet market needs for functionality, performance, reliability, realistic implementation schedules, and adherence to development goals and principles.
Provide technical leadership by researching and promoting new technologies and tools.
Address technical challenges involving performance, fault tolerance, security, and live production issues.
Participate throughout the service lifecycle and influence each step.

Desired Qualifications

Bilingual ability in Mandarin and English, preferred because the team works with stakeholders in different regions.
Expertise or eagerness to build expertise in blockchain and cryptocurrency, including how speculators, traders, digital asset exchanges, blockchain money services businesses, and financial institutions operate.
Experience working in disruptive technology and successfully launching products, ideally in FinTech, e-commerce, SaaS, AdTech, or digital wallet businesses.
A history and preference for being strategic, analytical, and execution-oriented.
Familiarity with product management processes and tools.
Experience working with teams across different time zones.

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 Java 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
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!

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.

About the Company

OKX

Venture capital for blockchain startups

OKX Ventures acts as the investment arm of the OKX cryptocurrency exchange, funding and supporting blockchain, DeFi, and Web3 projects. It invests across a wide range of areas—from infrastructure and middleware to applications and games—aiming to strengthen the crypto ecosystem. The firm provides capital and access to OKX’s network of partners and advisors to help portfolio companies grow and succeed. Notable holdings include Polygon, Solana, and Avalanche, reflecting a strategy focused on projects with potential to impact the crypto industry at large. OKX Ventures differentiates itself through its crypto-native perspective, extensive industry network, and active involvement in portfolio development, rather than just providing funding. Its goal is to identify promising projects and help them scale, contributing to a more robust and innovative blockchain ecosystem.

Company size: 5,001-10,000
Company stage: Not listed
Total funding: $1.1B
Headquarters: Singapore, Singapore
Founded: 2017

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