Yesica L.

QA Engineer with 4+ years of experience, currently the sole internal QA at Modak (a family fintech app), owning end-to-end quality: manual testing, in-house automation and AI tools applied to QA, including an AI-assisted test case pipeline and adversarial security testing of the product's AI assistant.

Advanced

English (C1).

QA Engineer (Mobile & Web) at Modak (2024-01 – Present)

• Sole internal QA at a fintech startup (React Native mobile app and React web app for families, parent/child accounts), owning end-to-end quality strategy: manual testing, in-house automation and AI tools applied to QA.
• Design and execute functional, regression, exploratory, integration and accessibility testing on critical fintech features (ACH payments, cards, onboarding, transfers, limits and controls), including testing on real iOS/Android devices.
• Built and maintain in-house end-to-end automation (Playwright/TypeScript for web, Detox/Jest for mobile), integrated into CI/CD.
• Designed and maintain an AI-assisted QA pipeline that converts user stories into Gherkin/BDD test cases, reviewing and validating the generated output before the team uses it.
• Adversarially tested the product's AI assistant to uncover security and data-exposure risks, and wrote Playwright security tests validating against XSS.
• Mentored two QA juniors with technical and career feedback, and co-led QA hiring. Validate APIs (Postman) and SQL/NoSQL, and am incorporating performance testing (k6).
• Tools: Playwright, TypeScript, Detox, Jest, Postman, SQL (MySQL), DynamoDB, k6, Claude Code, Jira, Confluence, Git, GitHub Actions, Bitrise

QA Analyst at QA Dream Team (2022-08 – 2024-12)

• Executed manual and automated testing of APIs and web/mobile platforms for clients across different industries (luxury retail, health and sports nutrition), including projects where I was subcontracted to perform senior-level QA work.
• Tested the integration of a luxury pre-owned watch platform across Shopify, a CRM and a warehouse system, validating data consistency across all three.
• Tools: TestRail, Postman, Swagger, SQL, Azure DevOps, Git, Jira

Software Development Technician Degree (finished, diploma in process) – IFTS N°29

Psychology Degree (thesis stage) – Universidad de Congreso