Senior Machine Learning Engineer, AI Platform

Senior Machine Learning Engineer, AI Platform

Team:
Firefox Locations:
Remote US, Remote Canada

The AI Platform team is responsible for building the foundational infrastructure that powers intelligent experiences across Mozilla products. This includes model training pipelines, high-throughput inference services, GPU orchestration, and secure, privacy‑respecting AI systems that operate reliably at global scale.

We’re looking for a Machine Learning Engineer with a strong platform mindset to help design, build, and operate Mozilla’s AI platform. In this role, you’ll work at the intersection of machine learning, distributed systems, and production infrastructure—ensuring that models can be trained, deployed, and served efficiently, securely, and  will collaborate closely with product, infrastructure, and security teams to enable fast iteration while meeting strict performance and privacy requirements.

• Design, build, and operate core AI platform components used to train, deploy, and serve machine learning models in production environments.
• Own model serving and inference workflows end‑to‑end, driving improvements in reliability, scalability, performance, and operational excellence.
• Lead efforts to optimize inference systems for throughput, latency, and cost efficiency across CPU and GPU workloads.
• Design and manage GPU‑based inference and training workloads, including performance tuning, capacity planning, and resource utilization optimization.
• Own and improve critical parts of the model lifecycle, including packaging, versioning, testing strategies, validation, and deployment automation.
• Implement and evolve observability practices (metrics, logging, tracing, alerting) to improve visibility and operational resilience of ML services and pipelines.
• Partner closely with product, infrastructure, security, and data teams to design scalable platform capabilities that enable AI‑powered features.
• Contribute to technical design discussions, propose architectural improvements, and mentor junior engineers through code reviews and knowledge sharing.
• Participate in and help improve operational processes, including incident response, on‑call rotations, and post‑incident reviews.

• Bachelor’s degree with 4–6 years of relevant industry experience, or Master’s degree with significant hands‑on experience building and operating production ML systems, or equivalent work experience.
• Strong experience developing in Python for machine learning systems, backend services, or distributed data processing.
• Proven experience deploying and operating ML workloads in cloud environments, including production‑grade infrastructure.
• Solid understanding of model serving architectures, inference pipelines, and performance trade‑offs (latency, throughput, cost, scaling strategies).
• Hands‑on experience working with GPU‑based workloads and accelerated computing in production settings.
• Experience designing CI/CD pipelines and development workflows that support reliable ML system deployment.
• Ability to independently scope and drive technical initiatives while balancing product and operational priorities.
• Strong problem‑solving skills and the ability to debug performance and reliability issues in distributed systems.
• Clear and effective communication skills, with experience collaborating across engineering, product, and infrastructure teams.

• Experience implementing inference optimization strategies such as batching, quantization, compilation, model conversion, or hardware‑specific tuning.
• Familiarity with containerization and orchestration systems (e.g., Docker, Kubernetes) in production environments.
• Experience designing observability systems for distributed services, including metrics strategy and performance profiling.
• Exposure to privacy‑preserving ML techniques, security best practices, or responsible AI system design.
• Contributions to open‑source ML infrastructure projects or leadership in building reusable internal ML tooling.

• Generous performance‑based bonus plans to all eligible employees – we share in our success as one team.
• Rich medical, dental, and vision coverage.
• Generous…