Full-Time

Senior Backend Engineer

Communications

Updated on 8/1/2026

Close

Close

201-500 employees

Subscription-based CRM to boost sales productivity

Compensation Overview

$140k - $210k/yr

Remote in USA

Remote

Category
Software Engineering (1)
Required Skills
WebRTC
Rust
Python
Distributed Systems
Apache Kafka
Postgres
TypeScript
Go
Redis
MongoDB

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Requirements
  • Python experience, with the ability to work across Go, Rust, or TypeScript and select the appropriate tool for the workload.
  • Deep experience with email and calendar platforms, including IMAP, synchronization protocols, calendar application programming interfaces, and enterprise mail servers.
  • Experience with real-time and asynchronous distributed systems, including WebRTC, WebSockets, queues, and streaming, and debugging production latency incidents.
  • Experience building or using live transcription, voice agents, or in-the-loop artificial intelligence features, with judgment about production readiness.
  • Experience with telephony providers, codecs, retries, and eventual consistency.
  • Experience using artificial intelligence tools in daily engineering workflows.
  • Experience with Python, Twilio, WebRTC, WebSockets, AssemblyAI, ElevenLabs, Kafka, Redis, PostgreSQL, and MongoDB.
Responsibilities
  • Overhaul the email and calendar synchronization engine to improve performance and reliability across millions of sales emails and calendar events.
  • Expand voice-agent capabilities and infrastructure for live conversations, including custom models for conversational edge cases such as voicemail and automated phone-tree detection.
  • Develop inbound calling capabilities, including specialized agents, receptionist functionality, and seamless call routing.
  • Build native calendar scheduling capabilities inside Close and more powerful scheduling for agents.
  • Design human orchestration for an agentic workforce by surfacing work that requires people to review, approve, or respond.
  • Improve connect rates and answer rates through phone-number pooling, local presence, branded calling, and reputation monitoring.
  • Advance the streaming and event substrate using Kafka, Redis, and pub/sub.
Desired Qualifications
  • Deep Twilio or similar telephony experience.

Close provides a subscription-based customer relationship management (CRM) platform for startups and SMBs to manage sales communications and reduce manual data entry. Its product works through a cloud-based, easy-to-use interface with automation features that streamline sales workflows and data capture, available on monthly or annual plans. The company differentiates itself by being bootstrapped and profitable with a fully remote team, emphasizing autonomy, asynchronous communication, transparency, and a culture of trust without micromanagement. Its goal is to double the productivity of sales representatives by making CRM workflows simpler and more automated while growing sustainably with a globally distributed team.

Company Size

201-500

Company Stage

Seed

Total Funding

$380K

Headquarters

Toronto, Canada

Founded

2013

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Simplify Jobs

Simplify's Take

What believers are saying

  • Chloe beta usage across 306 businesses validates demand for AI sales execution.[6]
  • Embedded AI can lift small-team productivity without adding headcount.[6]
  • Social selling and lead enrichment integrations expand Close’s multichannel reach.[5][8]

What critics are saying

  • HubSpot’s broader suite pressures Close with bundled marketing, service, and AI.[2]
  • Pipedrive and other SMB CRMs compete aggressively on simplicity and pricing.[2]
  • AI calling faces compliance scrutiny, threatening Chloe’s outbound growth story.[6]

What makes Close unique

  • Close embeds Chloe directly in the CRM, not as a standalone tool.[2][6]
  • Built-in calling, email, SMS, and automation reduce fragmented sales workflows.[2][6]
  • The product targets founders and small sales teams with simple, fast workflows.[1][2]

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Benefits

PTO

Family leave

Medical, dental, & vision coverage

401k with 6% match

Company goal-based bonus

Coworking stipend

Paid 4-week sabbatical

Flexible working hours

Growth & Insights and Company News

Headcount

6 month growth

0%

1 year growth

2%

2 year growth

1%
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