SDET (API Testing | Python) Engineer

🚀 SDET (API Testing | Python)
📍 Hybrid | 1 day hybrid in Gdańsk or Warsaw
Are you passionate about quality engineering, test automation, and building robust testing frameworks? Do you enjoy breaking systems before users do? We're looking for a Senior SDET (Software Development Engineer in Test) with strong Python and API testing expertise to help ensure the quality, reliability, and security of mission-critical applications in the fintech and payments industry.
This role combines software development, automation engineering, and quality assurance, with a strong focus on API testing, CI/CD integration, and modern AI-powered engineering practices.
💡 Your Mission
🧪 Test Automation & Quality Engineering
• Design, develop, and maintain scalable automated test frameworks using Python.
• Create and execute API test suites for RESTful and microservices-based applications.
• Develop end-to-end, integration, regression, and performance test scenarios.
• Improve test coverage, reliability, and execution efficiency across the platform.
• Collaborate with developers to implement shift-left testing practices.
🔍 API Testing
• Validate APIs for functionality, performance, security, and reliability.
• Design comprehensive test cases based on business and technical requirements.
• Perform contract, integration, and end-to-end testing across distributed systems.
• Analyze API logs and troubleshoot complex issues.
⚙️ CI/CD & Automation
• Integrate automated tests into Jenkins CI/CD pipelines.
• Support continuous testing strategies within Agile delivery teams.
• Improve automation processes to enable faster and safer releases.
• Monitor test execution and provide actionable quality metrics.
🤖 AI-Powered Quality Engineering
• Leverage AI tools such as GitHub Copilot, ChatGPT, Claude, and Cline to accelerate test development and improve productivity.
• Utilize AI-assisted approaches for test case generation, defect analysis, and documentation.
• Explore innovative AI-driven testing techniques and share best practices across the team.
🔐 Security & Compliance Testing
• Validate application security controls and authentication mechanisms.
• Support testing activities related to compliance and regulatory requirements.
• Ensure high-quality standards for systems processing sensitive financial data.
🤝 Collaboration
• Work closely with Developers, Product Managers, Business Analysts, and QA teams.
• Participate in Agile/Scrum ceremonies and planning sessions.
• Contribute to quality strategy, documentation, and process improvements.
🎯 Must-Have Skills
Automation & Programming
✔️ 5+ years of experience in software testing and test automation
✔️ Strong hands-on experience with:
• Python
• PyTest
• API automation frameworks
✔️ Experience building and maintaining automated test frameworks from scratch
API Testing
✔️ Extensive experience testing:
• REST APIs
• Microservices
• Distributed systems
✔️ Experience with:
• Postman
• Swagger/OpenAPI
• API mocking tools
• Contract testing
CI/CD & DevOps
✔️ Experience with:
• Jenkins
• Git
• CI/CD pipelines
✔️ Understanding of modern software delivery practices
Databases
✔️ Experience validating data using:
• PostgreSQL
• MySQL
• Oracle
• SQL queries
Quality Engineering
✔️ Strong understanding of:
• Test automation best practices
• Integration testing
• Regression testing
• Performance testing
• Defect management
⭐ Nice to Have
• Experience with Selenium, Playwright, or Cypress
• Experience with performance testing tools such as JMeter or Gatling
• Experience working in cloud environments (AWS, Azure, or GCP)
• Knowledge of Docker and Kubernetes
• Familiarity with security testing methodologies
• Open-source contributions
• Technical blogging or community involvement
💳 FinTech & Payments Experience
• 2+ years of experience in fintech, payments, banking, or financial services
• Understanding of payment processing systems and transaction workflows
• Knowledge of PCI DSS compliance requirements
• Familiarity with financial messaging standards and real-time payment systems
• Experience testing highly regulated applications
🎁 What You'll Get
✨ Opportunity to work on innovative fintech and payment solutions
✨ High-impact role shaping quality standards and automation strategy
✨ Exposure to cutting-edge AI-powered engineering tools
✨ Hybrid work model (Gdańsk or Warsaw)
✨ Collaborative and supportive engineering culture
✨ Career growth opportunities and continuous learning
✨ Influence on testing frameworks, tooling, and engineering best practices
🚀 Ready to elevate software quality through automation, innovation, and engineering excellence?
Join us and help build reliable, secure, and scalable platforms that power the future of digital payments.