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Performance Tester
Title: Performance Tester
Category: IT/Software Development
Job type: Permanent
Job status: Full Time
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Performance Tester


Performance Tester should possess strong analytical and problem-solving skills and have an eye for detail. We require a highly-motivated individual with well-developed interpersonal skills. You will be the Technical Performance Analyst in a specialist performance team working across Wunderman Thompson Commerce's broad client base.

You will be involved in the defining and creating performance scripts, executing the performance testing and then analysing, in detail, the results, and identifying problematic features and making recommendations to the wider team to resolve these.

This is a key role, responsible for the delivery and support of many high-profile eCommerce systems. The challenges you will face include different architectures, application components and their interaction.


Talented, enthusiastic, focused, eye for detail, professional. Keen to learn and find new ways of doing things. A team player who is proud of your work and wants to share with everyone! You like working in a fast-paced environment and are driven by the desire to improve the online purchasing experience for everyone, no matter what they are buying and from where!

The techy bit… we need you to be really great at:

5+ years’ experience in performance testing of eCommerce applications. 3+ years’ hands on experience of Performance test load generation tools, including JMeter. 1 years’ experience working within an Agile environment. 3+ years’ experience using Application Monitoring Tools including DynaTrace or AppDynamics. 3+ years hands on experience performance problem determination and root cause analysis. Very good knowledge and proven experience working on Linux and AIX environments. Experience tuning highly scalable applications, including reviewing configurations around cache sizes and heap sizes. Experience interpreting and analysing real user monitoring statistics. Experienced in load forecasting for peak times, and assessing likely resilience of systems as well as making recommendations on how to improve based on business needs. Experienced in pinpointing and resolving real time performance issues in live systems. Very good backend testing skills – conversant in databases (DB2, Oracle), SQL knowledge, use of DB Visualiser. Java expertise up to Architect level. Including profiling, ability to review java source code and recommend optimisations. Excellent interpersonal skills and a proven ability to collaborate with all stakeholders. Highly organized and owns their own deadlines, willing to go above and beyond what was promised to deliver quality service. Expertise in front end page load analysis and profiling and optimisation using Firebug/Pagespeed or other tools. Ecommerce platform expertise and experience performance testing and analysis on IBM WebSphere Commerce and SOLR search. Hands on experience analysing log files to make performance enhancement recommendations. Competent in logging identified issues, and tracking them through to resolution. If you know some of this even better!

Experience setting up performance monitoring using Grafana. Experience with other APM tools like New Relic Experience implementing performance testing in a continuous delivery environment. Scripting (Grinder, perl, awk etc) Competent in PHP Experience with Apache Tomcat, JBoss Experience with other load generation tools eg LoadRunner. eCommerce platform expertise and experience performance testing and analysis on Hybris, Magento and Intershop Wunderman Thompson Commerce is a new global eCommerce consultancy that applies strategy, technical know-how and outstanding design to make a big impact through eCommerce.

How? By creating outstanding websites and inspired shopper journeys. It’s why we work with some of the most exciting brands around such as GAME, Halfords, Sainsbury’s, Selfridges, Specialized and Ted Baker.

Tell me more! We’re an inclusive group of more than 1350 thinkers and doers from WPP’s leading commerce agencies: Salmon, POSSIBLE Commerce and Gorilla Group alongside two Amazon specialists - all under the world-renowned Wunderman brand. Our reputation is based on having the best the business – people who are inspired yet straight-talking, and who really want to understand not just our clients but their customers. We are passionate about innovation in everything we do, and proud of what our people achieve, empowering and respecting every one of them.

Together, we keep our clients and their customers inspired and ahead through digital, future-ready sites, solutions and services. When our clients win – we win.

With new, state-of-the-art offices in Watford, and two other cool agency offices in Central London, we’ve got 20 locations mapped across Europe, North America and Asia.

As our business grows internationally, we’re seeking new people who share our values and work ethic. We especially want to encourage more women to join, and take a key role in shaping some of the best eCommerce sites and experiences in the world.
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