Top Senior Software Engineer Jobs in San Francisco Bay Area, CA

Lead the design and evolution of predictive maintenance platform, build and scale ML-powered features, and mentor other engineers.

As a Senior Software Engineer on the molab team, you will design backend architecture, ensure high availability and low latency, and develop product features for a cloud-hosted marimo notebook service.

The Senior Software Engineer will design and build secure sandboxed runtime environments for Kubernetes, focusing on GPU workloads and ensuring performance and security in multi-tenant configurations.

Lead full‑stack engineering work on tax experiences: design, build, test, and operate scalable systems for tax collection, payment, and filing. Drive technical strategy, mentor engineers, collaborate cross-functionally, prioritize long-term architecture, and apply AI tools to improve developer productivity and customer workflows.

As a Video Engineer at Whatnot, you'll enhance the platform's video services, develop seller tools, and implement innovative video strategies to improve user engagement and experience.

Build a world-class Customer Support platform as a Senior Backend Engineer, managing high-scale backend systems and leading projects from inception to production.

As a Senior Backend Engineer, you will build internal operations tooling, scale infrastructure, and create AI-powered automations to improve operational efficiency at Whatnot.

Design and implement CIAM backend services for authentication and authorization. Integrate identity systems, manage secure flows, and automate infrastructure.

The role involves building systems for route planning, optimization, and real-time tracking for fleets, emphasizing scalable backend services and integration with dispatch tools.

The Senior Software Engineer will lead complex technical projects, mentor engineers, and enhance software practices while collaborating across teams to improve integration insights.

The Senior Software Engineer will develop a financial ecosystem, managing complex projects and building APIs for high-scale systems while collaborating across teams.

This role involves building and QA systems for reinforcement learning environments, focusing on design, effectiveness, and scaling while collaborating with AI researchers.

Design and build scalable RL environments, create automated QA systems, and collaborate with AI researchers to improve training data efficacy. Lead and mentor junior engineers.

Lead diverse technology projects and a team to create solutions for regulatory needs, leveraging distributed microservices and collaboration with product managers.

Design and build backend services and APIs for identity resolution while developing workflows for handling massive data volumes and mentoring junior engineers.

Senior Software Engineers at January design scalable systems, contribute to architecture, mentor junior engineers, and collaborate with cross-functional teams to improve financial solutions.

Lead design, build, and operation of AI-powered Growth experiences (conversational onboarding and AI-driven email). Own technical strategy for an AI Voice Agent and ACE-powered email systems, design APIs and frontend/backends, partner cross-functionally, establish applied-AI engineering patterns, measure impact, and mentor engineers to improve product quality and responsible AI use.

Lead full-stack development for employer and employee tax account systems: design reliable backend APIs and data models, build automation and agency-integration pipelines, model jurisdiction-specific compliance rules, mentor engineers, partner with product and operations, and deliver scalable, test-driven solutions that ensure tax accuracy and reliability at scale.

Lead org-wide developer experience and AI-enabled developer workflows. Identify and solve high-leverage bottlenecks across build systems, monorepo tooling, CI/CD, and test reliability. Drive standards, enable monolith-to-modular migration, embed with product teams, mentor engineers, and deliver AI-native developer tooling and adoption at scale.

Anrok seeks a Software Engineer with 7+ years experience to own product feature development, fix bugs, and collaborate on technical issues.

As a Staff Software Engineer at Samsara, you will lead and develop a high performing team, champion company culture, and contribute to the development of IoT platform solutions.

The Principal Software Engineer will design and implement systems for the advertiser experiences at Snap, lead technical vision, mentor engineers, and innovate on creator marketplace products.

Design, build, and maintain blockchain and payments infrastructure; develop scalable microservices and secure RESTful APIs to transfer value across blockchain and banking protocols; integrate with banks and fintech; own system design, testing, deployment, and troubleshooting; ensure reliability, code quality, and strong test coverage while collaborating with product and engineering teams.

Lead full‑stack development for Gusto's PEO Benefits product: design and build benefits shopping, plan recommendation flows, carrier integrations, automation agents, and MCP tools; scale Ruby/Rails and JavaScript/React systems; mentor engineers; drive multi‑quarter, cross‑functional projects from spec through launch and iteration; collaborate with Product, Data, Design, and Platform teams to deliver customer‑facing features.

Build and scale the core product using Python, while ensuring performance and reliability, in collaboration with founders in a fast-paced environment.