OKX will be prioritising applicants who have a current right to work in Singapore, and do not require OKX's sponsorship of a visa.   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 are looking for a Blockchain Security and Monitoring Engineer to join our team, responsible for developing an AML (Anti-Money Laundering) on-chain monitoring system and blockchain security defense system based on Spring Boot. This role will focus on tracking and analyzing hacker addresses, as well as using Revm sandbox environments to deeply simulate attack vectors and analyze risks through MEV economic models. You will provide comprehensive security support for financial institutions, blockchain projects, and law enforcement agencies. What You’ll Be Doing Implement a blockchain monitoring backend system based on Spring Boot Develop on-chain hacker address identification and tracking algorithms and alert systems to monitor suspicious transaction activities in real-time Build transaction relationship graphs to visualize fund flows Integrate multi-chain monitoring capabilities covering major public chains (ETH, BTC, BSC, etc.) Build sandbox environments based on Revm to simulate on-chain transaction execution processes and detect potential vulnerabilities and MEV-related risks Establish a real-time alert system for monitoring high-risk operations across multiple dimensions, such as abnormal gas consumption, permission changes, fund flows, etc. Research cutting-edge attack methods, optimize detection rule sets, and generate security incident analysis reports What We Look For In You  Bachelor's/Master's degree in Computer Science, Network Security, or related technical field Proficiency in at least one mainstream language (Java/Python/Rust) 3+ years of Java development experience, proficient in Spring Boot, Spring Cloud, and other frameworks Proficient in Kafka, Redis, Elasticsearch technology stack, with experience using relational databases (MySQL) Knowledge of using Python/Rust for building blockchain analyzers (such as Revm-based sandboxes) Understanding of Revm - including simulating attack POCs and sandbox environment testing Plus Points Experience in Anti-Money Laundering (AML) or blockchain security analysis Relevant experience and achievements in on-chain risk analysis - including real-time threat detection, incident analysis, etc. Deep understanding of mainstream DeFi protocols Contributions to open-source blockchain security tools or research MEV expertise - analyzing front-run and back-run patterns, designing anti-MEV protocols Familiarity with at least one mainstream blockchain platform (such as Ethereum, Solana, etc.) and proficiency in its smart contract mechanisms Profound understanding of common vulnerabilities in DeFi protocols and their attack methods, capable of analyzing and handling attack incidents   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!