Principal Software Development Engineer in Test (macOS)

ThreatDown is looking for..

ThreatDown is looking for an experienced Mac Automation Quality Engineer with a strong background in endpoint security and macOS platform testing. This role is ideal for someone who thrives in a fast-paced, multi-product environment, enjoys building scalable automation frameworks, and has a passion for uncovering complex platform and security-related issues. You’ll work closely with Engineering, Product Management, and Security teams to ensure high-quality delivery across modern macOS environments, while working on cutting-edge endpoint security technologies, helping secure enterprise environments at scale, collaborating with highly technical engineering and security teams, influencing automation strategy and quality practices across multiple products, and gaining deep exposure to the macOS security ecosystem and Apple Silicon platforms.

What You Will Do:

• Design, develop, and maintain automated test suites using Python and PyTest
• Validate endpoint security functionality across macOS releases and Apple Silicon platforms
• Debug and troubleshoot macOS-specific issues related to system behavior, sandboxing, permissions, and performance
• Analyze logs and diagnostics using macOS tools such as Console, sysdiagnose, and spindump
• Collaborate closely with developers to isolate issues, validate fixes, and ensure compatibility with new macOS versions
• Build and maintain test environments across physical Macs and virtualized macOS infrastructure
• Execute and enhance automated and manual test coverage for endpoint security features
• Track, document, and prioritize defects with clear reproduction steps and analysis
• Drive improvements in automation coverage, regression stability, execution efficiency, and quality metrics
• Participate actively in Agile development processes and continuously improve QA methodologies and tooling

Skills You'll Need to Have:

• 5+ years of experience in Quality Engineering, Test Automation, or Software Validation
• Strong experience testing macOS applications or endpoint security products
• Deep understanding of macOS internals, logging, and diagnostic tooling
• Hands-on experience with Python, PyTest, Bash scripting, and Git
• Experience with CI/CD and build systems such as Azure DevOps, Jenkins, GitLab, or TeamCity
• Experience with macOS virtualization platforms including VMware, UTM, or Tart
• Strong analytical, debugging, and troubleshooting skills
• Excellent written and verbal communication skills

Skills that are Nice to Have:

• Experience with Apple Endpoint Security Framework (ESF), MDM platforms, or mobileconfig profiles
• Experience testing EDR, antivirus, or endpoint protection technologies
• Familiarity with CI/CD automation pipelines and infrastructure testing
• Networking knowledge including REST APIs, TCP/IP, DNS, DHCP, and Active Directory
• Linux/Unix administration experience
• Enterprise IT administration experience including software deployment, security policies, backups, and multi-user environments
• Strong object-oriented programming fundamentals

Perks & Benefit:

• An opportunity to do something great for yourself and the world! 

• Employee Referral Bonus Program   

• Wellness programs    

(Benefits and Perks subject to change by country/region)