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Senior Staff Backend Engineer

W3 Sourcing


Job Location:

San Francisco, CA - USA

Yearly Salary: $ 175000 - 275000
Posted: 16 July 2026 (30+ days ago)
Application Deadline: 13 October 2026
Vacancies: 1 Vacancy

Job Summary

THE OPPORTUNITY

A portfolio of AI-native and data-intensive startups is hiring backend engineers to build the reliable systems data models and infrastructure behind rapidly scaling products.

WHAT YOU WILL DO

  • Design and build resilient backend services APIs data models and asynchronous workflows.
  • Own business-critical systems from architecture through deployment monitoring and incident response.
  • Improve performance reliability security and developer velocity as products scale.
  • Build clean interfaces around complex data and third-party integrations.
  • Partner with product and customer-facing teams to prioritise high-impact technical investments.
  • Mentor engineers and help establish practical engineering standards.

WHAT WE ARE LOOKING FOR

  • Substantial production backend engineering experience with Python Go Java Rust or similar.
  • Strong fundamentals in system design databases distributed systems and API development.
  • Experience operating cloud-based services and diagnosing performance or reliability problems.
  • Track record of owning complex projects with limited oversight.
  • Pragmatic judgment strong debugging skills and an ability to communicate trade-offs clearly.

PREFERRED BUT NOT ESSENTIAL

  • PostgreSQL event-driven architecture queues or workflow orchestration.
  • AI/ML platform LLM infrastructure or high-volume data-processing experience.
  • AWS GCP or Azure; Kubernetes and infrastructure-as-code exposure.

APPLICATION PROCESS

Employer identity and full role-specific details will be shared with suitable candidates during the recruiter screening process.

To apply: send your CV to or contact

Equal opportunity: Applications are welcomed from qualified candidates of all backgrounds. Eligibility to work in the stated location and any sponsorship availability will depend on the specific employer.