Senior/Staff Engineer, Messaging

OKX will be prioritising applicants who have a current right to work in Singapore, and do not require OKX's sponsorship of a visa About OKX 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, andGet 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 Team The Messaging & Notification team is responsible for building and maintaining the company's messaging platform, covering in-house instant messaging (IM) systems, email, SMS, and push notifications. We support many business lines growth with reliable and scalable user reach capabilities. Responsibilities Design, develop, and optimize core components of the messaging platform, including IM, email, SMS, and push notification systems. Continuously improve the architecture and performance of the messaging infrastructure to ensure high availability, scalability, and low latency, in-line with business growth. Troubleshoot and resolve complex issues in production environments, ensuring system robustness and reliability. Collaborate closely with product managers, QA engineers, and SREs to deliver high-quality features and solutions. Requirements Bachelor's degree or above in Computing. Solid foundation in Java programming, with in-depth understanding of JVM tuning, I/O, multithreading, concurrency frameworks, data structures, algorithms, and design patterns. Familiar with commonly used middleware such as MQ, RPC frameworks, caching, and databases; experience with production-level issue troubleshooting and performance tuning. Strong knowledge of microservices and distributed system architecture and principles (e.g., service discovery, tracing, CAP theorem, consistency models). Clear logic, fast learner, strong problem-solving and communication skills. Experience working on high-throughput and low-latency systems is a strong plus. 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 processInformation 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 . Create a Job Alert Interested in building your career at OKX? Get future opportunities sent straight to your email. Apply for this job *indicates a required field First Name *Last Name *Preferred First Name Email *Phone Resume/CV Enter manually Accepted file types: pdf, doc, docx, txt, rtf Enter manually Accepted file types: pdf, doc, docx, txt, rtf Are you legally authorized to work in the advertised location for this role? * Select... Please indicate if you are a Singapore Citizen, Permanent Resident, or if you require a work pass to work and reside in Singapore. For work pass holders, kindly also specify which pass you are currently holding, if applicable. * Select... What is your notice period to your current employer? * Select... How many years of experience do you have in Java programming? *#J-18808-Ljbffr