Non-Functional Testing Engineer – Performance & Resilience

Bestman Solutions; England; On-site; GBP 60,000 - 90,000; Full time

Job summary

Bestman Solutions is seeking an experienced Non-Functional Tester to join a global fintech programme transforming post-trade infrastructure. You will drive performance, resilience, and reliability across cloud-native, Kafka-based architectures, working with cross-functional teams.

You will design and execute NFT tests (load, failover, DR), analyse results, and contribute to CI/CD integration while shaping observability and monitoring practices across multiple domains.

Qualifications

• Experience in Non-Functional or Performance Testing roles within complex or regulated technology environments.
• Proven experience designing and executing tests across multiple NFT domains (performance, DR, failover, resilience, and scalability).
• Strong understanding of distributed architectures, Java microservices, and containerised deployments.
• Proficiency with testing and monitoring tools such as JMeter, LoadRunner, Grafana, Dynatrace, Splunk, or AppDynamics.
• Familiarity with CI/CD and DevOps tooling – Jenkins, Docker, Kubernetes, and related ecosystems.
• Ability to interpret system logs, analyse performance metrics, and provide actionable recommendations.
• Excellent stakeholder management and communication skills, with the ability to influence across technical and business teams.
• Experience working in Agile delivery environments with cross-functional teams.

Responsibilities

• Define, document, and execute Non-Functional Requirements (NFRs) across distributed microservices and infrastructure components.
• Collaborate with architects, product owners, and engineering squads to translate NFRs into measurable test scenarios.
• Develop and implement NFT strategies covering performance, scalability, failover, DR, resilience, alerting, and monitoring.
• Design and execute load, stress, endurance, and failover tests using industry-standard tools such as JMeter, LoadRunner, or ADS.
• Set up observability dashboards (Grafana, Splunk, Dynatrace, Kibana, or Datadog) to monitor test execution and system performance.
• Analyse results to identify performance bottlenecks, system vulnerabilities, and areas for optimisation.
• Report findings and recommendations clearly to both technical and non-technical stakeholders.
• Contribute to test automation frameworks, CI/CD integration, and continuous improvement of NFT processes.
• Support the onboarding of new services and provide input into architectural reviews from an NFT perspective.

Skills

NFT Testing

Performance Testing

Java microservices

Distributed systems

JMeter

LoadRunner

Grafana

Dynatrace

Splunk

AppDynamics

Jenkins

Docker

Kubernetes

Tools

JMeter

LoadRunner

Grafana

Dynatrace

Splunk

AppDynamics

Jenkins

Docker

Kubernetes

Job description

Bestman Solutions is seeking an experienced Non-Functional Tester to join a global fintech programme transforming post-trade infrastructure. You will drive performance, resilience, and reliability across cloud-native, Kafka-based architectures, working with cross-functional teams.

You will design and execute NFT tests (load, failover, DR), analyse results, and contribute to CI/CD integration while shaping observability and monitoring practices across multiple domains.