Staff Backend Software Engineer

Company: Confidential - Series A messaging-infrastructure company
Location: San Francisco, CA (in office 5 days per week)
Compensation: $225,000 - $300,000 + competitive equity
Employment Type: Full-time
Visa Sponsorship: Not available (US citizens and green card holders)

About the Company

A Series A company building AI-first outbound SMS infrastructure that delivers billions of messages a month for enterprise brands.

The Role

Our client is hiring a Staff Backend Software Engineer (6+ years) to own and build the core backend systems behind its highly scalable SMS messaging infrastructure. You will join a small, elite team with massive technical impact, and should have strong career velocity and a record of building 0-to-1 products at high-growth startups (pre-seed to Series B).

What You Will Do

• Own and build core backend systems across routing, messaging, delivery and automation.
• Design and ship scalable services handling billions of messages a month.
• Drive 0-to-1 development of entire product surfaces, not just features.
• Work closely with a lean engineering team.
• Solve hard infrastructure problems at scale while moving quickly from idea to production.

What You Bring

• 6+ years of backend engineering experience
• A record of building 0-to-1 products at high-growth startups (pre-seed to Series B)
• Experience with high-scale, queue-based infrastructure
• Node.js/TypeScript and AWS experience
• Ability to work in the San Francisco office 5 days a week
• US work authorization without sponsorship

Tech Stack

Node.js, TypeScript, AWS, SQS, queue-based infrastructure