Senior Backend Engineer - Backend Platform (USA Only, 100% Remote)Active$140K–$210K

The opportunity

Close runs on Python: Flask web apps, TaskTiger, billions of MongoDB documents, a public REST API that customers and external agents both build on. Four product teams ship features on top of that every week.

What you'll do

  • A seasoned Python engineer. Python is our backbone and it matters in this: role more than on other teams at Close. Architectural patterns don't port cleanly between languages, and you'll be setting the patterns. Go, Rust, or TypeScript alongside it is welcome.

  • Drawn to meta-problems. This team doesn't ship features to customers; it changes how features get built.

  • AI-native in production. You've shipped meaningful LLM-backed or agentic work: to real users. For a team building AI tooling that other engineers depend on, this is foundational to the role.

  • Working with AI in your day-to-day. You use coding agents in your own: workflow and have a real POV on where they help and where they get in the way. On this team, your POV becomes the product. We fund best-in-class developer tools and treat experimentation as part of the work.

  • Fluent in observability and production practice. Telemetry, metrics, tracing,: alerting, Sentry ownership, what production-ready actually means. You've been the person who made a system legible when it broke.

  • Opinionated about API design. You've shipped internet-facing APIs and you: think about who's on the other end — apps, agents, humans reading docs — and what each needs.

What they're looking for

  • Battle-tested. You've debugged incidents where latency budgets didn't hold,: owned a system everyone else relied on, or carried a pager for something with real customer impact.
  • A builder first. You'd rather get a rough v1 in front of five engineers than: spend three weeks on abstractions.
  • Energized by internal customers. Your users are a Slack DM away. You'll talk: to them directly instead of through a PM, and you'll use most of what you build yourself.
  • Expand DevDawg and Spice. Cloud development environments for our full stack,: paired with automated review and root-cause tooling that can approve real pull requests. Making that safe enough to cover more of our review surface is one of the team's biggest projects.