Systems Engineering Engineer in Cambridge

Visa is a world leader in payments technology, facilitating transactions between consumers, merchants, financial institutions and government entities across more than 200 countries and territories, dedicated to uplifting everyone, everywhere by being the best way to pay and be paid. At Visa, you'll have the opportunity to create impact at scale - tackling meaningful challenges, growing your skills and seeing your contributions impact lives around the world. Join Visa and do work that matters - to you, to your community, and to the world.

At Featurespace, we strive to be the world's best software company at protecting our clients and their customers from fraud attacks. Our real-time Financial Fraud Detection platform processes massive volumes of streaming and historical data. To meet our ambitious performance and scalability goals, we are looking for a Systems Performance Engineer with expertise in JVM tuning, distributed systems optimisation, and AWS infrastructure performance.

In your role as a Systems Performance Engineer, you will help us achieve our goals and deliver success on behalf of our customers by:

• Leading analysis of Engineering Triage tickets, supporting Support teams by diagnosing issues raised by customers and helping identify root causes.
• Interpreting logs, metrics, and customer-provided data to understand system behaviour and identify potential misconfigurations or bottlenecks.
• Setting up, running, and evaluating Proofs of Concept (POCs) to validate configuration changes, new tools, or new approaches.
• Analysing graphs, resource usage patterns, and system-level data to draw clear, evidence-based conclusions.
• Tuning and enhancing our system configurations to improve reliability, scalability, and efficiency.
• Investigating system-level issues in collaboration with engineering, support, and operations stakeholders.
• Conducting exploratory research, testing hypotheses, and leveraging web resources, documentation, and internal knowledge to resolve complex problems.
• Investigate and analyse issues raised through Engineering Triage, using system-level data, metrics, logs, and customer information.
• Apply strong Linux and shell scripting knowledge to gather data, run tests, and automate routine analysis.
• Use JVM knowledge to understand system behaviour, resource utilisation, and configuration impacts.
• Tune and enhance the current system setup by recommending configuration, architectural, or operational adjustments.
• Provide insights that directly influence system stability, performance, and customer satisfaction.
• Guide Support and Engineering teams by asking the right questions and helping interpret data.
• Deliver POCs that help the organisation evaluate new tools, architectures, or solutions with confidence.
• Influence technical direction by identifying structural or configuration improvements.
• Demonstrate a proactive, self-starting attitude - comfortable exploring issues independently before seeking help.
• Embrace a scientific mindset: formulate hypotheses, test them, evaluate results objectively.
• Help raise the overall standard of system analysis, investigation quality, and diagnostic understanding across the team.

Strong understanding of Linux internals, shell scripting, and system-level diagnostics. Foundational JVM knowledge (memory, threads, GC basics, configuration impacts). Ability to understand and interpret test results, workload outputs, and benchmark data. Demonstrated use of a home lab or personal systems projects (VMs, clusters, network setups, custom builds). Familiarity with common tooling for monitoring, metrics, or system insights. Database knowledge (relational or NoSQL). Understanding of networking fundamentals. Experience with open-source tools used for diagnostics, observability, or system performance. Basic programming ability (any language) to support automation or small tooling improvements.

As a System Performance Engineer, you also need the following qualities:

• Attention to detail, excellence and quality.
• A passion to work for one of the fastest growing fraud prevention technologies in the world.

Visa is an EEO Employer. Qualified applicants will receive consideration for employment without regard to race, colour, religion, sex, national origin, sexual orientation, gender identity, disability or protected veteran status. Visa will also consider for employment qualified applicants with criminal histories in a manner consistent with EEOC guidelines and applicable local law.