Senior Software Tester (Python)

Location: predominantly remote, occasional visits to Farnborough We’re hiring a Senior Software Tester to take the lead on testing strategy across sophisticated mobile and device-based systems. This is a high-impact position where you’ll go beyond day-to-day testing, helping to define frameworks, influence technical direction and champion best practice across engineering teams.You will be working in a complex, non-deterministic environment where system behaviour is not always predictable. This means you will play a key role in designing intelligent, resilient testing approaches that can handle variability, uncover edge cases and ensure consistent performance under real-world conditions.If you’re someone who thrives on solving complex problems, enjoys working at the intersection of hardware and software, and wants to raise the bar for quality, this could be the perfect move.You’d be working in a predominantly remote environment, with occasional visits to head office in Farnborough. Security Clearance: eligible for Security Check (“SC Clearance”) + sole UK national This is a full-time permanent Senior Software Tester position, paying up to £70,000 per annum, depending on experience. Skills and experience required:We’re looking for a technically strong, quality-focused professional who enjoys both hands-on delivery and strategic input.Strong Python skills, particularly for automation and scriptingProven experience testing mobile devices and managing test environmentsExperience working with or testing non-deterministic systems, with the ability to design robust test strategies for unpredictable outcomesA track record of improving testing processes or defining automation strategiesUnderstanding of firmware lifecycles (deployment, updates, version control)Experience working with CI/CD pipelines and modern development toolingSolid knowledge of iOS and Android ecosystemsStrong analytical and troubleshooting skills, especially across complex and variable device interactionsConfident communicator, with the ability to mentor and support others What you’d be doing:In this senior, hands-on role, you’ll play a key part in driving quality and continuous improvement:Build and maintain Python-based automation frameworksManage and optimise mobile testing environmentsDesign and implement testing approaches suitable for non-deterministic systems, ensuring reliability despite unpredictable behaviourDefine and deliver firmware testing and rollout strategiesLead both manual and automated testing activityCollaborate closely with engineering teams to support releases and improve product qualityAnalyse test outcomes, including inconsistent or non-repeatable results, and provide clear, actionable insightsMentor junior team members and embed best practicesEnhance tools, processes and documentation across the test functionMonitor and report on coverage, usage and performance metricsEligibility and security requirementsDue to the nature of the work:You must be a sole UK nationalYou must be eligible and willing to undergo SC ClearanceYou must have the right to work in the UK without sponsorshipBenefits:Competitive salary based on experience up to £70,000Pension contributionHealthcare packageBonus schemeOngoing learning and development opportunitiesIf you’re interested, then we’d love to hear from you - please Apply Now and send a CV for quick review.Should you require reasonable adjustments at any point during the recruitment process or if there is a better way for us to communicate, please do let us know.Software Tester, Senior Tester, Test Lead, Python, AutomationCircle Recruitment is acting as an Employment Agency in relation to this vacancy. Earn yourself a referral bonus if you refer somebody else who fills the role! We also offer an iPad if you refer a new client to us and we recruit for them. Follow us on Facebook - Circle Recruitment , Twitter - @Circle_Rec and LinkedIn - Circle Recruitment.

Salary: to £70,000 per annum, depending on experience