Quality Assurance Engineer

Duplo is a Lagos-based fintech startup that enables businesses in Africa to automate their spend management, simplify cross-border payments, and control business finances all on one platform. We want to make B2B payments as simple as P2P payment apps. Most business payments in Africa are made offline….yikes. We are on a mission to transform this. We are backed by top investors including Point Nine, Tribe Capital, Commerce Ventures, Liquid2 Ventures, Basecamp Fund, Soma Capital, YCombinator, Oui Capital, and others. This is a unique opportunity. You'll have the responsibility and resources to take a significant part in the creation of a paradigm-changing product that will impact millions. Responsibilities Cypress Test Automation Design, develop, and maintain automated end-to-end test suites using Cypress, with a focus on payment flows, checkout journeys, and transaction processing scenarios Implement the Page Object Model (POM) pattern for scalable test architecture across payment and software platform features Develop reusable custom Cypress commands, fixtures, and intercept strategies to simulate payment gateway responses, web hook events, and third-party integrations Integrate Cypress test suites into CI/CD pipelines for automated regression runs across payment processing environments Analyse and maintain test stability, resolving flaky tests and optimising run times; especially for payment-critical paths API Automation & Testing Design and execute comprehensive API test suites using tools such as Postman, RestAssured, or Cypress, covering payment gateway APIs, transaction endpoints, and financial data services Validate REST and GraphQL APIs including request/response schemas, status codes, error handling, and payment-specific response structures (e.g. authorisation, capture, refund, chargeback flows) Perform contract testing, load testing, and negative scenario coverage for payment API endpoints; including edge cases such as declined transactions, timeout handling, and partial captures Test integration with third-party payment providers (e.g. Stripe, Adyen, PayPal, or similar platforms), ensuring correct data exchange and fault tolerance Collaborate with backend engineers to review API specifications and identify edge cases early in the payment feature lifecycle Manual Testing & Test Strategy Create detailed test plans, test cases, and test reports for complex payment features, financial workflows, and software platform releases Perform exploratory, regression, smoke, and sanity testing across web, API, and payment surfaces; including end-to-end transaction journeys from initiation to settlement Champion a risk-based testing approach, prioritising payment-critical paths and high-value financial scenarios to protect platform integrity Document and track defects with clear reproduction steps using tools such as Jira or Linear, with specific attention to financial data accuracy and compliance-related issues Cross-Browser & Cross-Platform Testing Execute and maintain cross-browser test coverage across Chrome, Firefox, Safari, and Edge; including payment UI components such as card entry forms, 3DS authentication flows, and payment confirmation screens Leverage BrowserStack and Playwright for scalable cross-browser test execution across payment and checkout journeys Identify and report browser-specific rendering or functional inconsistencies affecting the payment experience Ensure consistent and secure user experience across desktop, tablet, and mobile viewports for all payment surfaces CI/CD Integration & DevOps Collaboration Configure and maintain automated test execution within CI/CD pipelines (GitHub Actions, Jenkins) for payment platform services and software solutions Implement test result reporting and failure notification workflows, with escalation paths for payment-critical test failures Work with DevOps to manage test environments, containerised test runs via Docker, and test data provisioning; including synthetic payme