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Customer.io Tech Stack

Multi-channel customer engagement platform for lifecycle marketing

Software Development Portland, Oregon 201–500 employees Founded 2012 Privately Held
customer.io LinkedIn

Customer.io operates a messaging platform spanning email, SMS, push, and in-app channels, built on Go + React + TypeScript across AWS and GCP. Active infrastructure scaling projects and adoption of AI agents for automation signal engineering focus on handling message volume and reducing operational toil—priorities that align with stated reliability and scalability challenges. Sales hiring velocity is accelerating against mid-market acquisition goals.

Tech Stack 33 technologies

Core StackGo React TypeScript AWS MySQL JavaScript Salesforce Salesloft Gong Zendesk Zapier Slack Zoom Snowflake Marketo Braze Iterable ActiveCampaign Klaviyo Twilio HubSpot Ember.js GCP Linear Notion EDR VPN DLP Planhat Liquid+3 more

What Customer.io Is Building

◆Challenges

  • Reliability challenges
  • Expanding sales team
  • Scaling with more customers
  • Scalability issues
  • Acquiring mid-market customers
  • High-volume requisition load
  • Reduce operational toil
  • Increase reliability
  • Reactive product organization
  • Lack of clarity of direction

▲Active Projects

  • Scale infrastructure for billions of messages
  • Deployment automation and incident response
  • Fullstack features powering key customer workflows
  • Ai agents for multi-file changes
  • Distributed systems for messaging at scale
  • Ai agent multi-file change automation
  • Design experiments for product changes
  • Lead product manager team
  • Cross-functional initiatives for core metrics
  • Product rituals evolution

Hiring Activity

Accelerating20 roles · 20 in 30d

Department

Engineering
8
Sales
7
Marketing
2
Data
1
Design
1
HR
1
Product
1
Security
1

Seniority

Senior
13
Director
3
Mid
3
Junior
1
Lead
1
Manager
1
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About Customer.io

Customer.io is a customer engagement platform that orchestrates personalized messaging across email, SMS, push notifications, in-app messages, and webhooks. The product targets marketing and product teams at growth-stage companies who need to manage multi-channel campaigns from a single interface, powered by real-time customer data. The company integrates with downstream tools (Salesforce, HubSpot, Marketo, Braze, Klaviyo) and upstream data systems (Snowflake) to reduce data silos. Founded in 2012 and based in Portland, Oregon, the company operates at 201–500 employees with current focus on scaling infrastructure for message volume and expanding sales coverage into mid-market segments.

HeadquartersPortland, Oregon
Company Size201–500 employees
Founded2012
Hiring MarketsUnited States

Frequently Asked Questions

What tech stack does Customer.io use?

Go, React, TypeScript, AWS, GCP, MySQL, and JavaScript form the core. Integration stack includes Salesforce, HubSpot, Marketo, Braze, Klaviyo, Twilio, Zapier, Slack, and Linear.

Where is Customer.io headquartered?

Portland, Oregon. The company hires in the United States and currently has 201–500 employees.

How this profile is built

Customer.io's technology stack, projects, and hiring signals are inferred from public hiring and company data — career pages, public listings, and company web presence — then clustered and de-duplicated. Figures are estimates that refresh over time. Read our full methodology →

This is not an official vendor or customer list. It is a technology-adoption signal inferred from public data, intended for B2B research.