Senior Backend Engineer – Communications

🕒 July 16

🇺🇸 United States – Remote

💵 $140k - $210k / year

⏰ Full Time

🟠 Senior

🔙 Backend Engineer

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Close

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2013

💼 Consulting

📣 Marketing

☁️ SaaS

Consulting • Marketing • SaaS

Close is a customer relationship management (CRM) software platform designed for small businesses, focusing on ease of use, automation, and integration with sales processes. It offers tools for call management, emailing, text messaging, and task scheduling all within a single platform. The platform eliminates the need for multiple tools by incorporating all necessary sales tools seamlessly. Close aims to empower small businesses to grow by being user-friendly, clutter-free, and equipped with automated sales functionalities, enhancing sales efficiency and effectiveness.

📋 Description

• Overhaul how Close syncs email and calendars. Our sync engine has run for a decade; we're making a serious, ground-up investment in its performance and reliability. • Take voice agents further into the call. We own the live conversation layer for Chloe's calls, and there's a lot of work ahead expanding our voice agent capabilities and infrastructure. • Solve inbound. So far Chloe makes calls; next she answers them. An inbound conversation can go anywhere — which raises real questions about specialized agents, a receptionist layer, and seamless call routing between them. • Build native scheduling. Core calendar scheduling capabilities inside Close, plus more powerful scheduling for our agents. • Design human orchestration of an agentic workforce. Agents create work for humans too — things to review, approve, respond to. • Push connect rates and answer rates. Phone number pooling, local presence, branded calling, reputation monitoring. • Move our streaming and event substrate forward. Kafka, Redis, pub/sub.

🎯 Requirements

• A seasoned engineer. Python is our backbone, but perhaps you've worked across Go, Rust, or TypeScript. You pick the right tool for the workload rather than retreating to what you know. • Deeply experienced with email and calendar platforms. IMAP, sync protocols, calendar APIs, and the thousand edge cases of oddly configured enterprise mail servers. This is the experience that makes someone successful on this team fastest. • Fluent in real-time and async distributed systems. WebRTC, WebSockets, queues, streaming. You've debugged a production incident where latency budgets didn't hold. • Opinionated about AI in real-time workflows. You've built or used live transcription, voice agents, or in-the-loop AI features. You have a view on what's ready for production versus what's still a demo. • At home in the gnarly bits. Telephony providers, codecs, retries, eventual consistency. You're drawn to the systems where edge cases actually matter. Deep Twilio or similar telephony experience is a big plus (not a requirement — but a game changer off the bat). • 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. • A builder first. You'd rather get a sloppy v1 in front of fifty customers than spend three weeks on abstractions. You ship.

🏖️ Benefits

• Health insurance • 401(k) matching • Flexible work hours • Paid time off • Remote work options