Key skills
PythonGoRustTypeScriptPydanticLangFuseMongoDBElasticsearchPostgreSQLRedisAWSEKSMSKRDSElasticCacheEC2DockerKubernetesTerraformAnsibleFlaskTaskTigerTwilioWebRTCWebSocketsAssemblyAIElevenLabsStripeOpinionated about API designAILLMClaudeCRM
About this role
Close is a fully remote company building the CRM for the next generation of small scaling businesses. They are seeking a Senior Software Engineer - Backend to work on AI-driven processes and contribute to various teams focusing on agent platforms, communications, CRM, and growth initiatives.
Responsibilities:
- A 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 direct
- Building 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 platform
- Working 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 work
- A 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 ship
- Opinionated 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 needs
- 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
Requirements:
- A seasoned engineer with experience in Python, Go, Rust, or TypeScript
- Experience building AI and shipping LLM-backed features for real users
- Ability to work with AI tools in day-to-day workflow to ship faster and write tighter code
- A builder-first mentality, prioritizing getting features in front of customers over perfection
- Opinionated about API design for modern software and experience shipping internet-facing APIs
- Experience debugging incidents with real customer impact and owning critical systems