Sr. Software Development Engineer in Test (Sr. SDET)

Ajaib is Indonesia’s leading fintech platform, is seeking a highly skilled Sr. Software Development Engineer in Test II (Sr. SDET II) to drive quality engineering across our rapidly scaling microservices platform. As the technical leader of our QA/SDET function, you’ll shape test strategy, build cutting-edge automation frameworks, and mentor SDETs to deliver zero-defect releases at scale.

This is a senior individual contributor role with technical leadership responsibilities - ideal for someone passionate about test architecture, advanced automation, and quality culture, without full-time people management duties.

What You’ll Do

• Own test strategy and automation architecture for multiple squads or product areas spanning backend, frontend, and mobile.

• Design, build, and scale test automation frameworks for API, UI, contract, integration, and performance testing.

• Partner with engineering leads and architects to embed testability and quality gates into designs and CI/CD pipelines.

• Mentor and upskill SDET engineers, review their test designs, and drive best practices across squads.

• Lead cross-functional initiatives on non-functional testing — performance, reliability, security, and chaos engineering.

• Collaborate with DevOps to optimize test pipelines for speed, scalability, and reliability.

• Diagnose complex production issues, perform root-cause analysis, and drive systemic fixes.

• Innovate and introduce tools, test data solutions, mocks, and dashboards that improve developer productivity and release confidence.

Requirements

• Bachelor’s degree in Computer Science, Software Engineering, or related field (or equivalent experience).
• 6+ years of experience in QA/SDET/software engineering, with at least 2+ years designing frameworks and leading quality initiatives.
• Strong programming skills in Python, Java, or JavaScript/TypeScript (can design and extend frameworks).
• Expertise in modern automation tools (WebdriverIO, Cypress, Appium, Selenium, Playwright, REST Assured, etc.).
• Proven experience testing distributed systems / microservices architectures, including API contract testing and service mocking.
• Solid understanding of performance, load, and security testing (JMeter, Gatling, k6, OWASP).
• Hands-on with CI/CD pipelines (GitHub Actions, GitLab CI, Jenkins, etc.).
• Exceptional debugging, analytical, and problem-solving skills.
• Strong communicator with experience influencing engineers and stakeholders at multiple levels.
• Experience with AI-assisted automation tools or integrating AI to optimize test coverage and efficiency.