Machine Learning Test Engineer, Hugging Face

• Proven experience working with modern machine learning frameworks (e.g., Transformers, PyTorch) and large-scale software projects
• A mindset that treats testing as a strategic priority, not a secondary task—demonstrating how robust testing directly enables project scalability
• Strong belief in architecting for growth: You prioritize scalable, modular testing systems over isolated, atomic tests
• Experience managing high-volume test suites (100K+ tests) and cross-platform testing challenges
• Familiarity with CI/CD tools and automated testing frameworks
• If you're interested in joining us, but don't tick every box above, we still encourage you to apply!

Desirable

• We are seeking a highly motivated Senior Test Engineer to join our Transformers team, where you will play a pivotal role in advancing one of the most critical aspects of our mission: testing
• As projects like Transformers, PyTorch, and vLLM rapidly expand in scale and complexity, the testing infrastructure must evolve in tandem
• With over 100,000–150,000 tests for the Transformers library alone—and the need to support diverse platforms—this role is essential to ensuring our testing ecosystem scales seamlessly to meet growing demands
• This is not a conventional testing role
• You will own the strategic redesign and scaling of our testing infrastructure, ensuring it keeps pace with the relentless growth of our projects
• While every engineer contributes to testing for their features, we need someone with a bird’s-eye view to champion testing as a core enabler of growth, rather than an afterthought
• Lead the reinvention and scaling of testing infrastructure to support 100K+ tests across multiple platforms (e.g., Transformers, PyTorch, vLLM)
• Design growth-oriented testing architectures that prioritize scalability, reliability, and integration with CI/CD pipelines, avoiding fragmented or isolated test workflows
• Partner with the existing testing lead to establish best practices and drive continuous improvement of the testing ecosystem
• Collaborate with cross-functional teams to embed testing as a first-class project, ensuring it receives the focus and resources required to sustain rapid growth
• Anticipate future testing needs and proactively adapt systems to accommodate evolving project scope, complexity, and platform diversity

• Please provide a cover letter mentioning why you would like to work in open-source at Hugging Face. We encourage you to mention your skills, potential expertise, and topics on which you would like to work