Senior Java Developer (with performance background)

We are currently launching a major business/IT transformation project with the main objective to reduce its IT costs and converge processes/organization and IT Systems across WM locations. This transformation has gone through a step of blueprint/masterplan and is now moving to detailed preparation and implementation phase. The candidate will work for this project as part of a small team dedicated to performance engineering and testing. The performance stakes of this project are significant because the planned mutualization will mean much higher workload and database volumes. The candidate will work closely with multiple teams, including Digital Channels, Infrastructure and other business applications and technology teams. His tasks will include:

• Help delivery teams load test and troubleshoot performance issues
• Help performance/Jmeter testers design and run/analyze load tests
• Analyze existing known performance issues, help finding their root cause and solutions
• Formalize and document the methodology for load testing
• Define and setup appropriate tooling when missing, including best practices
• Perform pilots on new tools to help with performance before adoption
• Train the various application teams on the subject.

• Bachelor’s Degree in computer science or computer engineering
• 5+ years of experience in software development
• 2+ years of experience performing load testing of Web applications or troubleshooting performance issues

• Java, and ideally Spring technical expertise
• Strong critical thinker with problem solving aptitude
• Good written and oral communication skills
• Good understanding of performance testing strategies and load models
• Knowledge and experience of a load testing tool, preferably Jmeter
• Knowledge and experience of profiling/monitoring tools (system, application server, application)
• Knowledge and experience of analyzing performance issues across all the tiers (client, network, application, database)
• Good expertise on SQL queries optimization
• Good understanding of caching mechanisms

• Experience with integrating performance testing in the CI
• Knowledge of an Application Performance Monitoring tool (APM)
• Knowledge of ELK to define application performance dashboards
• Knowledge and experience of a data generator tool to generate test data for load tests
• Speaking at conferences and/or user groups
• Contributing to open-source projects
• Knowledge of software development lifecycle and the integration of performance testing