AgileSource are looking for 4 - 5 Senior Performance Testers on a Permanent basis. This role will require 1 day a week in the office (London or Newcastle).
Role Summary
An experienced Performance Test Specialist is required to plan and deliver performance validation activities across complex digital platforms and core Back End systems. The role focuses on practical implementation within structured delivery environments where system stability, throughput, and scalability are essential.
This position is delivery-oriented and requires strong technical capability in modern cloud-based and distributed architectures.
Core Responsibilities
Develop and implement performance test strategies including load, stress, endurance, capacity, and scalability testing
Evaluate test outcomes, application logs, and infrastructure metrics to identify performance constraints
Define and confirm non-functional performance requirements, workload models, and capacity estimates
Create and maintain automated performance scripts and supporting documentation
Conduct testing within cloud-hosted non-production environments
Document and report performance issues with supporting technical evidence
Integrate performance testing activities within automated build and deployment pipelines where applicable
Produce performance reports and contribute to defect review discussions
Collaborate with engineering, architecture, infrastructure, and operations stakeholders
Required Experience & Skills
Demonstrated experience delivering performance testing for large-scale enterprise solutions
Practical expertise with industry-standard performance tools (eg, JMeter, Gatling, LoadRunner, k6, or comparable platforms)
Strong understanding of:
API-driven services and HTTP protocols
Database and data-layer performance considerations
Messaging systems and caching mechanisms
Distributed system behaviours under load
Experience interpreting system logs, monitoring dashboards, and performance metrics
Exposure to Agile or blended delivery methodologies
Experience working within controlled, compliance-driven, or assurance-focused environments
Advantageous Experience
Familiarity with application performance monitoring and observability platforms (eg, Dynatrace, AppDynamics, Elastic stack, Grafana)
Experience contributing to large, multi-team programmes
Knowledge of digital service standards or structured governance frameworks
Accountability & Scope
Responsible for designing and executing assigned performance testing activities
Ensures quality and accuracy of produced test artefacts and analysis
Provides findings and recommendations while operating under senior test leadership
Delivers agreed performance testing outputs within defined timelines