Performance Tester Job London area,Greater London England UK,IT/Tech

Salary: £43,000 - 83,000 per year

Requirements

Strong capability in at least two performance test tools, such as Load Runner and JMeter
Strong technical background and capability, including good knowledge of at least one software language
Fundamental understanding of common application technologies, such as web servers and databases
Understanding of performance monitoring across different servers, protocols, infrastructure, counter types, and application layers
Technologies needed: C#, .NET, TCP/IP, IIS, SQL Server, and network and server topology across web, app, and database servers
Knowledge of service layers, RESTful services, WSDL services, and FTS

Responsibilities

Produce Workload Analysis Documents and Performance Test Approach documents from project non-functional specifications
Produce performance test scripts, test data, and scenarios in line with the documented approach
Execute performance tests defined in the Workload Analysis Document and Performance Test Design
Document any deviation from the originally defined test scenarios
Log test results and present any extrapolation needed to indicate how the application may perform in a production environment
Work with the Technical Lead and other resources across development and environments teams to rectify and retest issues encountered during testing
Tune application performance
Summarise performance testing in the Performance Test Evaluation report

Technologies

C#
Embedded
Support
JMeter
Network
SQL
TCP/IP
Web
ASP.NET
Security

We work within Business Technology Solutions (BTS), helping clients navigate large-scale, technology-driven transformation programmes and delivering outstanding results through the right people, methodology, and process. Our Managed Testing Services (MTS) delivery unit focuses on helping clients achieve business value through testing transformation, including moving from embedded testing approaches to output- and outcome-based services, bid solutioning, and pre-sales support for sector growth initiatives.

This permanent Performance Tester role is based in London and is carried out across a wide variety of our sites and client locations. We offer professional development, accelerated career progression, an entrepreneurial environment, and a flexible benefits package. We also foster an inclusive culture committed to helping everyone achieve their full potential and balance work-life needs.

last updated 37 week of 2026