Senior AI Infrastructure Engineer (Model Serving Platform)

As a Software Engineer on the ML Infrastructure team, you will design and build platforms for scalable, reliable, and efficient serving of LLMs. Our platform powers cutting‑edge research and production systems, supporting both internal and external use cases across various environments. Responsibilities Build and maintain fault‑tolerant, high‑performance systems for serving LLM workloads at scale. Build an internal platform to empower LLM capability discovery. Collaborate with researchers and engineers to integrate and optimize models for production and research use cases. Conduct architecture and design reviews to uphold best practices in system design and scalability. Develop monitoring and observability solutions to ensure system health and performance. Lead projects end‑to‑end, from requirements gathering to implementation, in a cross‑functional environment. Ideal Qualifications 5+ years of experience building large‑scale, high‑performance backend systems. Strong programming skills in one or more languages (e.g., Python, Go, Rust, C++). Experience with LLM serving and routing fundamentals (e.g., rate limiting, token streaming, load balancing, budgets, etc.). Experience with LLM capabilities and concepts such as reasoning, tool calling, prompt templates, etc. Experience with containers and orchestration tools (e.g., Docker, Kubernetes). Familiarity with cloud infrastructure (AWS, GCP) and infrastructure as code (e.g., Terraform). Proven ability to solve complex problems and work independently in fast‑moving environments. Nice to haves Experience with modern LLM serving frameworks such as vLLM, SGLang, TensorRT‑LLM, or text‑generation‑inference. Compensation and Benefits Compensation packages at Scale for eligible roles include base salary, equity, and benefits. The range displayed on each job posting reflects the minimum and maximum target for new hire salaries for the position, determined by work location and additional factors, including job‑related skills, experience, interview performance, and relevant education or training. Scale employees in eligible roles are also granted equity‑based compensation, subject to Board of Director approval. Your recruiter can share more about the specific salary range for your preferred location during the hiring process, and confirm whether the hired role will be eligible for equity grant. You’ll also receive benefits including, but not limited to: Comprehensive health, dental and vision coverage, retirement benefits, a learning and development stipend, and generous PTO. Additionally, this role may be eligible for additional benefits such as a commuter stipend. Pay transparency: The base salary range for this full‑time position in the locations of San Francisco, New York, Seattle is $216,200—$270,250 USD. PLEASE NOTE: Our policy requires a 90‑day waiting period before reconsidering candidates for the same role. This allows us to ensure a fair and thorough evaluation of all applicants. About Us At Scale, our mission is to develop reliable AI systems for the world’s most important decisions. Our products provide the high‑quality data and full‑stack technologies that power the world’s leading models, and help enterprises and governments build, deploy, and oversee AI applications that deliver real impact. We work closely with industry leaders like Meta, Cisco, DLA Piper, Mayo Clinic, Time Inc., the Government of Qatar, and U.S. government agencies including the Army and Air Force. We are expanding our team to accelerate the development of AI applications. Equal Opportunity We believe that everyone should be able to bring their whole selves to work, which is why we are proud to be an inclusive and equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability status, gender identity or Veteran status. We are committed to working with and providing reasonable accommodations to applicants with physical and mental disabilities. If you need assistance and/or a reasonable accommodation in the application or recruiting process due to a disability, please contact us at View email address on click.appcast.io. Please see the United States Department of Labor's Know Your Rights poster for additional information. We comply with the United States Department of Labor's Pay Transparency provision. 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