
SaaS • Government • Security
Black Rainbow is a software company that builds the NIMBUS ecosystem — a configurable digital forensics, investigation, case management and intelligence platform for law enforcement, government and corporate security teams. Its products (NIMBUS Intelligence, Investigator and Forensics) provide audit‑ready evidence tracking, workflow automation, quality management and reporting to streamline investigation lifecycles and ensure compliance. Black Rainbow delivers its solutions as enterprise-grade software to improve efficiency, oversight and defensibility of investigations.
11 - 50 employees
Founded 2017
☁️ SaaS
🏛️ Government
🔐 Security
5 days ago
🇬🇧 United Kingdom – Remote
⏰ Full Time
🟡 Mid-level
🟠 Senior
⚙️ Software Development Engineer in Test (SDET)

SaaS • Government • Security
Black Rainbow is a software company that builds the NIMBUS ecosystem — a configurable digital forensics, investigation, case management and intelligence platform for law enforcement, government and corporate security teams. Its products (NIMBUS Intelligence, Investigator and Forensics) provide audit‑ready evidence tracking, workflow automation, quality management and reporting to streamline investigation lifecycles and ensure compliance. Black Rainbow delivers its solutions as enterprise-grade software to improve efficiency, oversight and defensibility of investigations.
11 - 50 employees
Founded 2017
☁️ SaaS
🏛️ Government
🔐 Security
• Design, develop, and maintain load test scripts to simulate realistic user workloads • Establish and baseline performance test scenarios to evaluate system behaviour under expected and peak load conditions • Execute load tests against candidate releases to confirm performance improvements and ensure no degradation in application performance • Analyse test results, measure key performance metrics (e.g., response time, throughput, latency), and identify bottlenecks or scalability issues • Collaborate with development and stakeholders to provide actionable insights and recommendations for performance optimization • Generate detailed performance reports to support data-driven decisions on release suitability • Continuously improve testing processes by leveraging JMeter’s scripting capabilities and integrating with CI/CD pipelines • Stay updated on industry best practices and emerging tools for performance testing • Maintain and expand existing documentation (test cases, wiki etc.) to create a repeatable and scalable test environment • Participate in project meetings to ensure that testing is built into all projects from the start • Document, track and escalate issues as appropriate • Use Scrum Agile methodologies to help drive and deliver product releases • Actively participate in scrum events; refinement, planning, stand-ups, reviews and retros
• Eligible to work in the UK or Republic of Ireland • Five years plus of related professional QA experience with proven experience in performance and load testing, preferably using Apache JMeter and Azure DevOps • Experience of web-based testing and browser DevTools • Experience of writing test cases for and testing multi-tier systems; Database, App Servers, Web and Mobile Apps • Strong understanding of performance testing methodologies, including workload modelling and benchmarking • Proficiency in creating and maintaining test scripts to simulate complex user interactions • Ability to analyse performance metrics and identify bottlenecks using tools like JMeter, Azure DevOps, or similar platforms • Familiarity with CI/CD pipelines and integrating performance tests into automated workflows • Understanding of software development practices and Agile methodologies. • Strong problem-solving skills and attention to detail in analysing test results and diagnosing performance issues • Excellent communication skills to collaborate with cross-functional teams and present findings clearly • Experience of Jira, Confluence and/or MS/Azure DevOps for managing the Agile process
• Competitive salary • Fully remote • Flexible working hours • Twenty-five days annual leave (in addition to public holidays) • Pension • Private health care which includes family members • Training support • Regular company meetups
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