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About the Role

Threat Metrix is looking for an experienced developer and systems engineer to work across multiple teams and components, providing architecture, design, implementation, and review to a broad range of products and technologies across the Threat Metrix platform. This role involves research and experimentation to improve product efficiency.

Responsibilities

• Drive production p95/p99 down and throughput up across services and data paths.
• Diagnose hotspots using tcpdump/pcap, kernel metrics and code runtime analysis.
• Tune Linux (RHEL/CentOS/Rocky/Alma) networking: sysctls, queues, IRQ affinity, RPS/RFS, backlog sizing, PMTU/IPv6.
• Read and fix performance issues in C++ (Java is a plus).
• Set client policy guardrails (timeouts/retries/back-pressure/connection pools) to protect tail latency.
• Lead design and code reviews; write crisp experiment notes; mentor engineers across teams.

Requirements

• Excellent written/spoken communication; can align multiple teams with data/presentations.
• Strategic thinking
• Team player who works effectively with others
• Detail Oriented and desire to learn/research/understand
• Ability to work with geographically dispersed teams in different timezones
• Ability to accept criticism and provide feedback (e.g. code reviews)
• 10+ years building high-performance systems with strong recent hands-on in C++ (Java a bonus)
• 10+ years OS/kernel/networking configuration & optimisation on Linux in production
• Code reviews, CI, source control, bug tracking (Atlassian/Jira/Bitbucket or similar)
• Design & architecture for low-latency, high-throughput services

Skills

• Proven production wins reducing tail latency (p95/p99) on RHEL/CentOS/Rocky/Alma systems.
• Fluency with packet and kernel observation: tcpdump/pcap, ss/netstat, /proc/net/*, sar, perf
• Concrete Linux networking tuning: SYN/accept backlog, socket buffers, GRO/GSO, PMTU/MSS clamp, IRQ/RPS/RFS/affinity, conn tracking nuances.
• Strong recent hands-on in C++ (threading/lock contention) and bonus Java (GC ergonomics, thread pools, reactive/async).
• NoSQL at scale (Aerospike/Scylla/Cassandra/Redis/Dynamo): data modelling, client policies, compaction/replication trade-offs.
• TLS termination at scale, proxies/load balancers (Envoy/Nginx/A10), IPv6 edge cases.
• SRE practices: SLIs/SLOs, canaries, chaos, incident reviews.

Location

• metro Atlanta

Work Type

• full-time

Experience Level

• Senior Principal
• 10+ years

Benefits

• country specific benefits

About the Company

• At LexisNexis Risk Solutions Company, we believe in the power of data and advanced analytics for better risk management. With over 40 years of expertise, we are the trusted data analytics provider for organizations seeking actionable insights to manage risks and improve results while upholding the highest standards for security and privacy.
• Headquartered in metro Atlanta, LexisNexis Risk Solutions serves customers in more than 100 countries and is part of RELX Group plc, a world-leading provider of information and analytics for professional and business customers across industries.
• The LexisNexis Risk Solutions Threat Metrix engineering team is an international team that includes experts in device identification, device intelligence, fraud detection, high performance and low latency real time systems, Software as a Service (SaaS) applications, machine learning, and data analytics.
• We are an Agile engineering team using concepts such as Scrum, Continuous Integration, self-organizing teams, and Continuous Improvement.
• At LexisNexis® Risk Solutions, our businesses span multiple industries providing customers with innovative technologies, information-based analytics, decisioning tools and data management services that provide market-specific solutions.
• Approximately 11,100 employees in offices throughout the world support our brands by serving customers in more than 180 countries.
• LexisNexis® Risk Solutions is part of RELX, a global provider of information and analytics for professional and business customers across industries.

Equal Opportunity

• 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.