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

Senior software engineer responsible for architecting and delivering full-stack solutions for scientific workflows (studies, workflows, procedures) used in regulated GLP/GMP environments. Lead multi-quarter initiatives, influence engineering direction, mentor engineers, partner with product and design, and explore AI/LLM opportunities to accelerate lab operations. Own end-to-end delivery and help scale hiring, tooling, and processes.

Build and operate full-stack applications, backend services, SDKs, APIs, and product integrations for Shield AI’s shared services platform. Own solutions from design through production support, establish secure and reliable interfaces, collaborate with product and engineering teams, and contribute to architecture and technical direction. Work includes authentication, telemetry integrations, customer-facing portals, reusable capabilities, and public APIs.

Lead the technical direction and architecture of the Foundations platform team, owning authentication, authorization, SSO, secrets management, tenancy, and core platform services. Design APIs, drive services through launch, make technical decisions, establish engineering standards, and mentor engineers without formal management authority. Partner with engineering and product leaders to align execution with priorities.

Lead the technical roadmap for partner integrations across APIs, SDKs, and web experiences. Design and build scalable products, standardize external partner integrations, and deliver payment and data-sharing capabilities. Collaborate with Engineering, Product, Design, Infrastructure, Sales, Partner, and Customer Success teams while remaining hands-on. Drive architecture, code quality, delivery, stakeholder alignment, and technical strategy for high-impact fintech products.

Design and implement backend services, modernize legacy systems into microservices, ensure strong testing and production observability, and collaborate with Product and Engineering teams. The role requires independent project ownership, strong system design, AI-assisted development using tools such as Claude or Cursor, effective communication with nontechnical stakeholders, and adaptability in an ambiguous, fast-changing environment.

Own and improve the software platform for autonomous underwater robots: deploy and update fleet software, build remote monitoring and high-bandwidth comms, expand simulation and testing, create operator/customer tooling, and execute field testing with international travel.

Develop and scale NinjaOne’s ticketing and billing products using Java and Kotlin. Design reliable enterprise software, REST services, relational data systems, caching solutions, and client-server applications. Address scalability, asynchronous design, API development, testing, and integrations with accounting platforms such as QuickBooks and Xero. Contribute hands-on code, apply object-oriented design principles, and help ship software serving millions of endpoints.

Build and ship customer-facing products across backend services, APIs, data models, React web interfaces, and Android point-of-sale applications. Learn unfamiliar platforms quickly, collaborate with product and design, deliver resilient code, and own testing, instrumentation, on-call support, and cleanup. The role emphasizes 0-to-1 product development, customer-focused decision-making, rapid experimentation, and using AI tools to improve development velocity and quality.

Design, architect, implement, and optimize high-performance iOS camera features (primarily Objective-C). Develop and launch stable mobile features, collaborate with Design, perform code reviews, and leverage AI tools responsibly to accelerate development while ensuring performance, security, and production quality.

Design, implement, and maintain scalable, secure, high-performance backend systems and public-facing APIs. Collaborate with Product and Data Science teams, lead initiatives improving efficiency and system performance, and support customer satisfaction. Work may involve distributed systems, pricing engines, identity management, authentication, authorization, API versioning, deprecation, and rate limiting.

Senior full-stack engineer who builds backend-heavy features and customer-facing React UIs. Own end-to-end delivery: design, implement, test, monitor, and iterate on scalable RESTful microservices using raw SQL and cloud patterns. Collaborate with product and design, review code, ensure reliability, security, and data correctness.

Design, maintain, and evolve core backend systems and APIs. Collaborate with product teams to create durable and reusable systems while enhancing performance and security.

Lead software engineering for the Patient Onboarding team, building and improving registration, insurance verification, and care-access workflows. Write full-stack production code, lead complex cross-team initiatives, shape technical direction, improve engineering foundations, and support modern AI-enabled development practices. Collaborate with Product, Design, Analytics, and Engineering to improve patient conversion and system reliability.

Build and operate backend services powering OpenAI’s Responses API. Responsibilities include designing developer-facing APIs, enabling agent workflows, improving reliability for long-running requests, optimizing performance and latency, supporting staged launches, and turning production issues and developer feedback into durable improvements. The role requires strong distributed systems, concurrency, asynchronous execution, observability, and production troubleshooting skills, with cross-functional collaboration across research, safety, product, and engineering teams.

Designs, builds, and scales backend services and integrations for payments, billing, identity, and partner connectivity. Sets technical vision and architecture for distributed systems, leads cross-team delivery, manages production rollouts, builds fault-tolerant services and data pipelines, and mentors engineers. The role partners with product, design, and engineering teams to deliver frequent, reliable improvements for Flex’s rent payment platform.

Design, build, and scale backend services and integrations for payment, billing, identity, and partner systems. Own API scoping, design, implementation, deployment, and production operations with minimal oversight. Build fault-tolerant systems, data pipelines, and scalable architectures while collaborating with product, design, engineering, and external partners. Contribute to reliability monitoring, observability, automation, technical standards, and mentoring in a distributed team.

Build and own full-stack MarTech services, scalable APIs, event-driven systems, data pipelines, and customer-facing web experiences. Integrate advertising, analytics, messaging, and marketing platforms while supporting attribution, identity resolution, experimentation, acquisition, and retention. Collaborate cross-functionally with marketing, product, data, design, and engineering teams to launch measurable growth initiatives. Mentor engineers and establish technical best practices across high-scale marketing infrastructure.

Build and ship 0-to-1 product experiments across the full stack, with emphasis on frontend development and product experience. Translate ambiguous user needs and emerging technical capabilities into testable concepts, guide iteration through research and metrics, and own technical direction from prototype through scaling or handoff. Collaborate with design, product, research, and engineering teams in a fast-moving, high-autonomy environment.

Design and build backend services and APIs for identity resolution and platform integrations. Optimize event-driven pipelines processing billions of signals, deploy cloud-native services on AWS EKS and Kubernetes, and ensure reliability, observability, and scalability. Collaborate with engineering, product, and data teams to deliver identity solutions while mentoring junior engineers. The role requires expertise in backend or data engineering, distributed systems, streaming technologies, cloud deployment, data modeling, and high-throughput databases.

Design and build scalable services, APIs, platform capabilities, and product features. Own architecture and technical decisions, improve reliability and engineering practices through testing and operations, collaborate cross-functionally, mentor engineers, and help guide team direction.

Senior .NET Software Engineer responsible for end-to-end software development using Microsoft technologies. Requires extensive experience in SDLC, design principles, technical documentation, web application development with .NET, Agile/SCRUM, Entity Framework, database design, and version control. Familiarity with project tools JIRA, TEMPO, Bitbucket, and Confluence preferred.

Build reliable, scalable software products and APIs for Zip’s enterprise procurement platform. Responsibilities include designing web applications, writing maintainable code, collaborating with product and customer-facing teams, and solving complex technical challenges autonomously. The role spans backend and frontend development, integrations, reporting, workflows, and payment systems, with opportunities to work alongside AI/ML teams.

Design, build, and operate high-throughput backend services on Claude’s token-generation path. Own latency, reliability, SLOs, incident response, safe deployments, graceful degradation, and cost efficiency. Lead technical direction, design reviews, tradeoffs with inference and research teams, mentoring, and operational improvements across the Safeguards organization.

Design, develop, and modernize enterprise-scale applications, RESTful APIs, microservices, and distributed systems. Build cloud-neutral solutions across AWS and Azure, support legacy application migrations, participate in architecture and code reviews, troubleshoot production issues, document technical designs, and mentor engineers. The role emphasizes scalable, secure, high-performance backend systems, technical leadership, and engineering best practices.

Design, develop, and maintain full-stack applications and services to support operations for genetic lab tests. Collaborate with stakeholders to define requirements, build sustainable applications, improve development processes, handle PHI under HIPAA training, and pass background checks.