Senior Software Engineer

Senior C++ Engineer Are you a software engineer passionate about building high-performance, low-latency systems? Do you want to leverage your C++ expertise in an exciting, high-impact fraud prevention environment where your code processes billions of transactions worldwide?About the Business LexisNexis is a data and analytics company with 10,500 colleagues serving customers in more than 150 countries. We're one of the largest information and analytics companies on the planet. We design solutions that help our customers increase productivity, improve decision-making and outcomes, and be more successful.About our Team ThreatMetrix, a part of RELX, is a global leader in digital identity intelligence and fraud prevention. Our engineering teams build high-performance systems that process billions of transactions, helping organizations make trusted decisions in real time.Our team builds and maintains high-throughput, low-latency systems that process massive volumes of transactions in real time. Engineers in this team collaborate closely with data scientists, platform engineers, and product managers to deliver systems that power trusted decisioning at global scale.About the Role As a Senior C++ Engineer, you will play a pivotal role in designing and developing high-performance, low-latency backend systems at the core of our fraud prevention platform. You will leverage your expertise in modern C++, multi-threaded programming, and distributed systems to build and optimise services that process massive volumes of transactions in real time across multiple regions worldwide. Reporting to the Engineering Manager, this is a full-time role within a high-performing engineering team. This role will be based in Australia (Sydney preferred), with flexibility to work from home.You will work with modern C++, NoSQL databases, message queues, and scripting layers, contributing to a platform deployed across multiple data centres — a mixture of on-premises clusters and cloud-based infrastructure — orchestrated via Kubernetes.ResponsibilitiesDesign and develop high-performance C++ backend services and componentsBuild and optimise multi-threaded, low-latency systems for real-time transaction processingWork with NoSQL databases and message queue technologies to handle large-scale data flowsContribute to scripting and configuration layers that drive system behaviourCollaborate with teams building microservices in Go and Python to deliver end-to-end solutionsTroubleshoot, profile, and improve system performance, scalability, and reliabilityContribute to system architecture, design decisions, and engineering best practicesReview code and mentor junior engineersEnsure high-quality, maintainable, and testable code through static analysis, sanitizers, and thorough testingRequirementsStrong proficiency in modern C++ (C++17/20)Solid experience with multi-threaded and concurrent programmingExperience with CMake or similar C++ build systemsStrong Linux systems programming skillsSolid understanding of distributed systems and microservices architectureExperience with NoSQL databases (e.g., Aerospike, Cassandra, or similar)Experience with message queue technologies (e.g., Kafka, ActiveMQ, or similar)Proven ability to profile, debug, and tune performance-critical systemsStrong problem-solving and debugging skillsAbility to work in a fast-paced, collaborative environmentDesirableWorking experience with PythonExperience with Lua scriptingExperience with GoFamiliarity with Boost librariesFamiliarity with RPC frameworks (e.g., Thrift, gRPC)Experience with Kubernetes and DockerPrior experience in the fraud prevention or fintech domainWork in a way that works for you We promote a healthy work/life balance across the organization, with various flexible and remote working options available to employees.Working for you We know that your wellbeing and happiness are key to a long and successful career. These are some of the benefits we are delighted to offer:Discounted Health plan rate and Optical AssistanceLife assurance and income protectionOption to buy additional Annual Leave daysEmployee Assistance ProgramFlexible working arrangementsBenefits for you and your familyAccess to learning and development resourcesWe are committed to providing a fair and accessible hiring process. If you have a disability or other need that requires accommodation or adjustment, please let us know by completing our Applicant Request Support Form or please contact 1-855-833-5120.Criminals may pose as recruiters asking for money or personal information. We never request money or banking details from job applicants. Learn more about spotting and avoiding scams here.Please read our Candidate Privacy Policy.We are an equal opportunity employer: qualified applicants are considered for and treated during employment without regard to race, color, creed, religion, sex, national origin, citizenship status, disability status, protected veteran status, age, marital status, sexual orientation, gender identity, genetic information, or any other characteristic protected by law.USA Job Seekers:EEO Know Your Rights.