Senior Quality Engineer

London, UK Pontoon Adecco Pontoon is an employment consultancy. We put expertise, energy, and enthusiasm into improving everyone's chance of being part of the workplace. We respect and appreciate people of all ethnicities, generations, religious beliefs, sexual orientations, gender identities, and more. We do this by showcasing their talents, skills, and unique experience in an inclusive environment that helps them thrive. Job title: Senior Quality Engineer Location: London (2 days per week onsite Mon & Thu) Contract: 6 months with possible extension Rate: £500 - £550 inside IR35 Key Responsibilities Design, develop, execute, and maintain manual and automated test cases for functional, integration, system, regression, and end-to-end testing. Validate merchant onboarding journeys, our Accept application flows, payment processing, settlements, and terminal management capabilities. Execute testing across web, mobile (iOS & Android), API, and backend systems. Prepare detailed test plans, test scenarios, test cases, and test execution reports. Perform API testing and integration testing across internal and third-party platforms. Support SIT, UAT, FOV (First Occurrence Validation), production releases, and post-release verification activities. Validate business-critical payment processing and settlement workflows. Perform data validation, reconciliation, and operational testing to ensure end-to-end integrity. Identify, log, track, and verify defects through to closure using Jira or equivalent tools. Collaborate with developers and engineers to improve quality and test coverage throughout the software development lifecycle. Support CI/CD pipelines and contribute to continuous testing practices. Participate in incident investigations, root cause analysis, and post-release reviews. Ensure adherence to our security, governance, risk, and compliance requirements. Participate actively in Agile ceremonies including Sprint Planning, Daily Stand-ups, Sprint Reviews, and Retrospectives.Skills & Technologies Testing & Quality Assurance Functional Testing System Integration Testing (SIT) User Acceptance Testing (UAT) End-to-End Testing Regression Testing Mobile Application Testing API Testing Production Verification / FOV Testing Defect Management & Root Cause Analysis Test Planning & Test ExecutionAutomation & Tools Selenium Playwright (essential) Postman REST API Testing JMeter / Performance Testing Jira Xray / ZephyrTechnical Skills SQL and Database Testing JSON / REST Services Mobile Testing (iOS & Android) Web Application Testing Test Data Management Log Analysis and TroubleshootingDevOps & Delivery GitHub Git CI/CD Pipelines Jenkins / Azure DevOps (Preferred) Agile / Scrum Methodologies Release Management ProcessesDomain Knowledge (Highly Preferred) The ideal candidate should have knowledge and experience in the following areas: Merchant Services & Payments Merchant Acquiring Merchant Onboarding Payment Processing Terminal Payments Contactless Payments Merchant Settlement & Reconciliation Payment Operations Payment Lifecycle ManagementMerchant Platforms Merchant Portal Salesforce iSnap Terminal Estate Management Customer Onboarding PlatformsCard Schemes Strong understanding of: Visa Mastercard Diners Club American Express (Desirable)Including: Authorisation Flows Settlement Processes Merchant Fees & Charges Interchange & Scheme Fees Chargebacks & Disputes Compliance RequirementsKey Qualities Expected Ownership & Accountability Proactive Communication Strong Problem-Solving Skills Attention to Detail Collaboration & Teamwork Customer-Focused Mindset Time Management & Prioritisation Continuous Learning & Improvement Ability to work effectively across UK and India-based teams Positive and Professional AttitudePreferred Experience Years of Quality Assurance / Testing experience. Experience within Banking, Financial Services, Payments, or Merchant Acquiring domains. Strong experience testing customer-facing mobile and web applications. Experience with card payments, merchant onboarding, and acquiring platforms. Experience supporting production releases, FOV testing, and incident investigations. Exposure to third-party payment providers is advantageous. Experience working within large-scale Agile delivery environments. Adecco Pontoon is an employment consultancy. We put expertise, energy, and enthusiasm into improving everyone's chance of being part of the workplace. We respect and appreciate people of all ethnicities, generations, religious beliefs, sexual orientations, gender identities, and more. We do this by showcasing their talents, skills, and unique experience in an inclusive environment that helps them thrive