[Remote] Senior Software Engineer - Backend (USA Only - 100% Remote)

Note: The job is a remote job and is open to candidates in USA. Close is a profitable CRM company focused on helping teams sell more efficiently through innovative sales software. They are seeking a Senior Software Engineer to work on backend systems, utilizing Python and AI technologies to enhance their platform and improve user experiences.ResponsibilitiesBuild Close’s agentic platform and customer-facing AI experiencesOwn the voice, SMS, and email infrastructure powering CloseBuild the structured context layer that humans and agents both depend onRun the experiments and own the billing infrastructure that turn trials into paid customersSkillsA seasoned engineer. Python is our backbone, but perhaps you've worked across Go, Rust, or TypeScript. You pick the right tool for the problem rather than retreating to what you know. You've seen a variety of problems, can collaborate and self-directBuilding AI. You've shipped LLM-backed features for real users and have a POV on where they're trustworthy, where they fall over, and how to get them production-ready when customers bet revenue on the output. We use Pydantic, Temporal, LangFuse, and other modern AI infrastructure tooling to power our agent platformWorking with AI in your day-to-day. You use AI tools in your own workflow to ship faster, write tighter code, and reason about unfamiliar parts of the codebase. We fund the use of AI tools (Claude Code, Codex and other best-in-class developer tools) and treat learning and experimentation as part of the workA builder first. You'd rather get the first iteration of a feature in front of fifty customers than spend three weeks fretting over a perfect PR. You shipOpinionated about API design for modern software. You've shipped internet-facing APIs and you think about who's on the other end - apps, agents, humans poking around in docs - and what each of them needsBattle-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 impactBenefitsCompetitive pay plus an organization-wide goal-based bonus~5 weeks of PTO to start. Plus a 1-week all-company Winter Holiday Break and paid US holidays. You'll earn 2 extra days for every year you're with Close.Work with your manager to choose between a standard 5-day week or a 4-day week at 80% payPaid leave for primary and secondary caregiversA 1-month paid sabbatical every 5 years with the teamTwo medical plans with Close covering 99% of your premium, plus Dental, Vision, HSA, FSA, and company-paid Long-Term DisabilityWe match your contributions up to 6%, vested immediatelyCompany OverviewA CRM for startups and small businesses with built-in sales communication tools. It was founded in 2011, and is headquartered in Palo Alto, California, USA, with a workforce of 51-200 employees. Its website is https://www.close.com.