Senior Software Engineer – Backend (USA Only, 100% Remote)

The role

A Senior Software Engineer will build and scale backend systems for a CRM. You will work on teams such as Agents, Communications, CRM, or Growth to develop AI-driven features and infrastructure.

What you will do

• Build agentic platforms and customer-facing AI experiences
• Own voice, SMS, and email infrastructure
• Build structured context layers and rebuild data models
• Run experiments and own billing infrastructure
• Ship LLM-backed features for real users
• Design internet-facing APIs
• Debug incidents and own critical systems

Required qualifications

• Seasoned engineer
• Python
• Shipped LLM-backed features for real users
• Opinionated about API design for modern software
• Experience debugging incidents and owning systems with customer impact

Nice to have

• Go
• Rust
• TypeScript

Benefits

• Competitive pay plus an organization-wide goal-based bonus
• ~5 weeks of PTO to start
• 1-week all-company Winter Holiday Break
• Paid US holidays
• 2 extra days of PTO for every year with Close
• 80% Work Option: 4-day week at 80% pay
• Paid leave for primary and secondary caregivers
• 1-month paid sabbatical every 5 years
• Best-in-class health coverage with majority of premiums covered
• Two medical plans, plus Dental, Vision, HSA, FSA, and company-paid Long-Term Disability
• 401k match up to 6%, vested immediately

Before you apply

• USA Only
• Applications that read as fully AI-generated will not be considered
• Role-specific questions are part of the application process

About the company

Close is a bootstrapped and profitable company with a 130-person, 100% remote team. They build a communication-first, AI-powered CRM designed to help small, scaling businesses.