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João H.

✨ Newly Added

Senior QA Engineer / SDET

Brazil6+ years experience$9,400/mo

Notable Highlight

6+ years of QA experience with a primary focus on fintech, payments, and high-availability systems. Built and maintained automation frameworks from scratch using Java, Cypress, Selenium, and Appium. Extensive experience testing web, mobile (native and Flutter), backend services, APIs, and databases.

Experience Summary

QA Automation Engineer with 6+ years of experience across fintech, payments, SaaS, trading platforms, and banking products. Designed, built, and maintained automation frameworks for web, mobile, APIs, and backend systems. Proficient in test strategy, regression, integration, API, mobile, database, and CI/CD testing. Collaborated with developers, DevOps, product managers, and infrastructure teams in agile environments.

Key Achievements

* 6+ years of QA experience with a primary focus on fintech, payments, and high-availability systems. * Built and maintained automation frameworks from scratch using Java, Cypress, Selenium, and Appium. * Extensive experience testing web, mobile (native and Flutter), backend services, APIs, and databases. * Worked on payment rails, trading platforms, and SaaS products supporting U.S. financial institutions. * Automated API testing using RestAssured and Postman while validating contracts, payloads, and integrations. * Implemented automation within CI/CD pipelines using GitHub Actions, Jenkins, Docker, and Azure DevOps. * Experience with cloud-native deployments and DevOps environments using ArgoCD and AWS Secrets Manager. * Developed a custom Azure API orchestration tool at a previous company that reduced regression analysis windows from 3 days to 1 day. * Engineered a Java test data automation utility at CS (Lojas Renner) that reduced manual setup time from 8 minutes to near-zero seconds. * Led a Jenkins-to-GitHub Actions pipeline migration at Amb. (Binance US) that reduced CI execution time to 20–30 minutes. * Eliminated hardcoded credentials across a legacy 7,000-test backend framework by integrating AWS Secrets Manager. * Passed code review for a 13,000-line Pull Request covering production SwiftUI code and unit tests at Amb. (Binance US).

Skills

* QA Automation * Manual Testing * API Testing * Mobile Testing * Web Testing * Backend Testing * Regression Testing * Integration Testing * Database Testing * Test Strategy * Test Framework Development * CI/CD * Agile / Scrum * FinTech * Payments * Banking * SaaS * Trading Platforms * Cypress * Selenium * Appium * RestAssured * Maestro * Cucumber * Postman * WireMock * BrowserStack * Jira * Zephyr * Azure DevOps * Azure Test Plans * Xray * GitHub Actions * Jenkins * Docker * ArgoCD * AWS Secrets Manager * Java * JavaScript * Kotlin * C# * Swift * SQL * Gherkin * Cursor * ChatGPT Pro * Claude * GitHub Copilot * Gemini Java, C#, Kotlin, SQL, Swift, JavaScript, Gherkin, Cypress, Appium, RestAssured, Selenium, Maestro, Cucumber, GitHub Actions, Docker, AWS Secrets Manager, ArgoCD, Jenkins, WireMock, Jira, Zephyr, Azure DevOps, Azure Test Plans, Postman, SwiftUI, UIKit, BDD, Allure, BrowserStack, Polly.core, ChatGPT, GitHub Copilot, Cursor, Gemini, Microservices, Test Automation, CI/CD, DevSecOps, Disaster Recovery Testing, Azure APIs, Crypto Trading & Order Books, FIAT Gateways, Payment Rails, Credit Engines

Work Experience

Senior QA Engineer / SDET

A(U · Oct 2024 – Present

  • Leverage AI workflows (Cursor/Claude) to accelerate transitions between test automation, backend delivery, and native mobile development while aligning with engineering standards.
  • Migrated a core feature from legacy UIKit to modern SwiftUI. Collaborated with the iOS Lead to adhere to the Design System, extended components within the custom UI framework, and passed a code review for a 13k-line Pull Request (comprising production code and unit tests).
  • Partner with PMs on PRDs to take over, finalize, and deploy business-critical backend features. Assumed ownership of the final 10% of development for automated Price Alerts and Token Recommendations after a team transition, managing production release syncs and tracking live logs for a zero-error rollout.
  • Collaborate with product and dev teams to relaunch the "Boost" yield platform. Contributed to the design of internal configuration utilities that unblocked marketing and business teams from launching campaigns independently.
  • Partner with Infra/DevOps to eliminate hardcoded credentials across a legacy 7k-test backend framework. Engineered the Java automation layer from scratch to dynamically consume secure keys provisioned within AWS Secrets Manager.
  • Orchestrate the migration of the backend test suite from Jenkins to GitHub Actions. Upgraded the framework from Java 8 to Java 23, containerized the execution layer using Docker, and worked with infra to validate runner security compliance, lowering execution time to 20–30 minutes.
  • Spearhead the quality strategy alongside the Exchange squad for the "Multi Purchase" tool, verifying complex multi-order book executions and single-transaction crypto bundling.

QA Engineer

a previous company · Sep 2023 – Oct 2024

  • Leverage ChatGPT Pro and GitHub Copilot to optimize development velocity, accelerate test script refactoring, and debug complex automation bottlenecks.
  • Manage quality for a complex financial platform used by major US banks (Amex, PNC), where regressions impact a massive client base simultaneously.
  • Share ownership of a 5,000+ test regression suite per client, ensuring the technical integrity of the high-volume EnCompass payment engine.
  • Develop a custom orchestration script using Azure APIs to fetch and parse failure metrics into actionable CSV reports, cutting regression analysis windows from 3 days to just 1.
  • Integrate Polly.core retry policies precisely targeted at granular HTTP/Selenium steps rather than full tests, preserving suite execution speed.
  • Partner with DevOps during multi-region DR failover drills; execute automated suites post-traffic redirection to validate system health and RTO/RPO compliance.

Software Tester / Quality Assurance

CS(R · May 2021 – Sep 2023

  • Deeply explore project repositories to master codebase structures, rapidly transitioning to independently drive complex QA demands and move from junior to mid-level responsibilities within six months.
  • Spearhead quality initiatives for the core Payments and Credit areas of a major Brazilian retail platform (Lojas Renner), validating high-stakes features like credit engines, private-label card integrations, and sensitive user data.
  • Partner actively with Backend developers to safely break down legacy monolithic architectures into modular, decoupled microservices using Java. Ensure zero production regressions and verify that new services run and scale completely independently.
  • Design and engineer a robust, on-demand Java utility script to automate complex financial user test data generation, slashing manual front-end setup times from 8 minutes down to seconds.
  • Accelerate front-end testing timelines by implementing WireMock to simulate and validate UI components against backend contracts before live backend engineering is completed.
  • Maintain and expand dual-layer automation pipelines, building backend suites using Java, RestAssured, Allure, and Cucumber via Jenkins, alongside mobile test coverage using Cucumber, Appium, and BrowserStack across Azure DevOps.
  • Integrate early workflows with Gemini, ChatGPT, and GitHub Copilot to optimize test script refactoring, accelerate data mapping, and streamline test case writing in BDD Gherkin.

Sourced by Daniel Mejia