Staff Backend Software Engineer

The 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.

• 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

The client is the first outbound operating system for SMS, giving enterprise brands AI-first infrastructure to deliver campaigns at scale across enterprise, SMB and political messaging. It delivers billions of messages a month.

Founded in 2023, the client recently raised a $50M Series A from top-tier investors and is a team of about 18.