Senior Software Engineer, Cloud Development

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser, and Pocket, a service for keeping up with the best content online. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About the Team & Role 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 Senior Software 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 at scale. You will collaborate closely with product, infrastructure, and security teams to enable fast iteration while meeting strict performance and privacy requirements. What You’ll Do Design, build, and operate core platform services and APIs used to deploy and serve production workloads at scale. Own service reliability end-to-end, driving improvements in availability, scalability, performance, and operational excellence. Lead efforts to optimize backend services for throughput, latency, and cost efficiency across distributed infrastructure. Design and manage Kubernetes-based workloads, including GitOps deployment pipelines, environment configuration, and resource utilization optimization. Own and improve critical parts of the service 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 backend services and pipelines. Partner closely with product, infrastructure, security, and data teams to design scalable platform capabilities that enable new product 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. What You'll Bring Bachelor's degree with 4–6 years of relevant industry experience, or Master's degree with significant hands-on experience building and operating production systems, or work experience equivalent Strong, modern Python skills, with experience writing clean, maintainable code and working with a fast toolchain (dependency management, linting, formatting, type checks, pre-commit), building both libraries and CLIs that output structured data. Advance experience with database deployment and management, bonus points for familiarity with Postgres Proven experience deploying and operating workloads in cloud environments, including production-grade infrastructure on GCP and GKE (artifact registries, managed caches, networking and internal load balancing, VPC, DNS, and separation of nonprod and prod). Hands-on experience with Kubernetes and Helm, writing charts that deploy across environments with per-environment configuration and progressive feature rollout. Experience with Terraform for provisioning infrastructure across environments, including schema validation and PR-level plan review. Experience designing and running scalable APIs that hold up under load, including health and readiness checks, auth, and clean startup and shutdown. Experience with Grafana or similar tools for metrics, dashboards, and reading application and infrastructure health together during rollouts. 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. On-call experience, including participating in incident response and post-incident reviews. Bonus Skills Experience with Ray or Ray Serve for GPU-backed model serving, including setting resource requests and replica counts aligned with available hardware. Experience building stateless ML services such as embedding or similarity models, including multi-model loading, runtime device selection, batch APIs, and handling model-cache and cold-start tradeoffs. Experience running a multi-provider LLM gateway, including routing between providers, migrating models, and mixing self-hosted with third-party serving. Familiarity with containerization and orchestration systems in production environments beyond core Kubernetes/Helm usage. Exposure to privacy-preserving ML techniques, security best practices, or responsible AI system design. Contributions to open-source infrastructure projects or leadership in building reusable internal tooling. What you’ll get: Generous performance-based bonus plans to all eligible employees - we share in our success as one team Rich medical, dental, and vision coverage Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) Quarterly all-company wellness days where everyone takes a pause together Country specific holidays plus a day off for your birthday One-time home office stipend Annual professional development budget Quarterly well-being stipend Considerable paid parental leave Employee referral bonus program Other benefits (life/AD&D, disability, EAP, etc. - varies by country) About Mozilla Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online. Commitment to diversity, equity, inclusion, and belonging Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions. We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation. We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. Group: D #LI-REMOTE Req ID: R3149 Hiring Ranges: Canada Tier 1 Locations $104,000—$139,000 CAD Canada Tier 2 Locations $95,000—$126,000 CAD