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.