IT Performance Specialist
Location: Brussels (Hybrid)
Seniority: Senior / Expert
Mission
We are looking for an experienced IT Performance Specialist to support a major application modernization project and strengthen performance testing practices across the organization. The role combines hands-on performance testing, performance engineering, automation, and coaching of development and QA teams.
Key Responsibilities
Performance Testing
* Define performance testing strategies based on non-functional requirements (NFRs).
* Design, develop, and maintain performance test scripts using Apache JMeter and existing frameworks.
* Execute load, stress, endurance, and scalability testing campaigns.
* Monitor application and infrastructure performance metrics during test execution.
* Analyze results, identify bottlenecks, and provide technical recommendations for optimization.
* Produce detailed analysis reports and executive summaries for project and architecture teams.
Performance Engineering & Continuous Improvement
* Assess existing performance testing processes, frameworks, and tools.
* Recommend and implement improvements to increase testing maturity and efficiency.
* Support teams in adopting performance testing best practices and methodologies.
* Integrate performance testing activities into test management and delivery processes.
* Contribute to the evolution of CI/CD pipelines and test automation frameworks.
Automation & Industrialization
* Design and optimize CI/CD pipelines for automated performance testing.
* Support migration and modernization of testing workflows, including Jenkins to GitLab CI transitions.
* Maintain and improve distributed testing environments.
* Document testing frameworks, environments, processes, and standards.
* Facilitate knowledge-sharing sessions, workshops, and technical coaching.
Required Skills & Experience
Performance Testing
* Expert-level experience with Apache JMeter.
* Strong background in load, stress, endurance, and scalability testing.
* Experience defining performance testing strategies and non-functional testing frameworks.
* Proven ability to analyze application and infrastructure performance metrics.
* Experience identifying performance bottlenecks and recommending solutions.
Automation & DevOps
* Strong experience with:
o Git / GitLab CI
o Jenkins
o Docker
o Kubernetes
o CI/CD pipeline implementation and optimization
* Experience with distributed test environments and automation frameworks.
Monitoring & Observability
* Grafana
* Elasticsearch / Kibana
* InfluxDB
* Performance monitoring and reporting tools
Development & Scripting
* Groovy
* Java
* Python
* Shell scripting
Soft Skills
* Strong analytical and problem-solving abilities.
* Autonomous and proactive mindset.
* Excellent communication and stakeholder engagement skills.
* Ability to coach, mentor, and guide technical teams.
* Strong documentation and knowledge-sharing capabilities.
* Continuous improvement and innovation mindset.
Language Requirements
* French: Native or fluent professional proficiency.
Work Arrangement
* Hybrid working model.
* Initial on-site presence required for onboarding and knowledge transfer.
* Full-time availability required during critical project periods.
Ideal Profile
A senior performance testing and performance engineering expert with extensive experience in Apache JMeter, CI/CD automation, observability tools, and performance optimization, capable of combining technical expertise with coaching and process improvement to enhance overall testing maturity and application performance.