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.
Responsibilities
Design and develop high-performance C++ backend services and components
Build and optimise multi-threaded,



low-latency systems for real-time transaction processing
Work with NoSQL databases and message queue technologies to handle large-scale data flows
Contribute to scripting and configuration layers that drive system behaviour
Collaborate with teams building microservices in Go and Python to deliver end-to-end solutions
Troubleshoot, profile, and improve system performance, scalability, and reliability
Contribute to system architecture, design decisions, and engineering best practices
Review code and mentor junior engineers
Ensure high-quality, maintainable, and testable code through static analysis, sanitizers, and thorough testing
Requirements
Strong proficiency in modern C++ (C++17/20)
Solid experience with multi-threaded and concurrent programming
Experience with CMake or similar C++ build systems
Strong Linux systems programming skills
Solid understanding of distributed systems and microservices architecture
Experience 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 systems
Strong problem-solving and debugging skills
Ability to work in a fast-paced, collaborative environment
Desirable
Working experience with Python
Experience with Lua scripting
Experience with Go
Familiarity with Boost libraries
Familiarity with RPC frameworks (e.g., Thrift, gRPC)
Experience with Kubernetes and Docker
Prior experience in the fraud prevention or fintech domain
Work 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 Assistance
Life assurance and income protection
Option to buy additional Annual Leave days
Employee Assistance Program
Flexible working arrangements
Benefits for you and your family
Access to learning and development resources
We are delighted to offer country specific perks.
To learn more about opportunities with LexisNexis or RELX, join us here:
We 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 **************.
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.
RELX is a global provider of information-based analytics and decision tools for professional and business customers, enabling them to make better decisions, get better results and be more productive.
Our purpose is to benefit society by developing products that help researchers advance scientific knowledge; doctors and nurses improve the lives of patients; lawyers promote the rule of law and achieve justice and fair results for their clients; businesses and governments prevent fraud; consumers access financial services and get fair prices on insurance; and customers learn about markets and complete transactions.
Our purpose guides our actions beyond the products that we develop.
It defines us as a company.
Every day across RELX our employees are inspired to undertake initiatives that make unique contributions to society and the communities in which we operate.
Thank you for your interest.
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📌 Senior Software Engineer (New South Wales)
🏢 Lexisnexis Risk Solutions
📍 New South Wales