Customer.io Tech Stack

Multi-channel customer engagement platform with data-driven messaging.

Software Development Portland, Oregon 201–500 employees Founded 2012 Privately Held

Customer.io operates a messaging platform built on Go + React, integrated with Salesforce, Marketo, Braze, and Klaviyo—indicating deep embeddedness in martech stacks. Hiring velocity is accelerating across sales (11 open roles) and engineering (6), while projects center on infrastructure scaling ("billions of messages"), deployment automation, and partner ecosystem expansion. The pain-point cluster—rapid scale, onboarding friction, forecast accuracy—points to a company in growth-mode managing both internal system bottlenecks and go-to-market complexity.

Tech Stack 35 technologies

Core StackGo React TypeScript AWS MySQL JavaScript Salesforce Salesloft Gong Zendesk Zapier Slack Zoom Snowflake Marketo Braze Iterable ActiveCampaign Klaviyo Ember.js GCP HTML CSS Linear Notion EDR VPN DLP Planhat Liquid+4 more

What Customer.io Is Building

◆Challenges

Improving system efficiency
Building partner marketing team
Expanding sales pipeline
Improving forecast accuracy
Scaling partner ecosystem
Rapid scale
High volume customer requests
Customer onboarding
Scaling systems for more customers
Reducing onboarding friction

▲Active Projects

Support team workflow automation
Partner onboarding workflows
Build reporting and dashboards
Scale infrastructure for billions of messages
Automate deployments and incident response
Global partner marketing strategy
Partner recruitment campaigns
Build fullstack features for key customer workflows
Financial reporting accuracy improvement
Design system and frontend architecture

Hiring Activity

Accelerating35 roles · 20 in 30d

Department

Sales

Engineering

Support

Marketing

Ops

Data

Finance

Seniority

Senior

Mid

Junior

Manager

Director

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About Customer.io

Customer.io is a messaging platform enabling companies to send email, SMS, push, in-app messages, and webhooks triggered by customer data. Founded in 2012 and headquartered in Portland, Oregon, the company serves mid-market and enterprise teams looking to consolidate customer engagement across channels in a single interface. The platform connects to data warehouses (Snowflake), CRMs (Salesforce), and downstream martech tools (Marketo, Braze, Klaviyo, Iterable, ActiveCampaign), allowing teams to build customer journeys without data silos. At 201–500 employees, the company is actively scaling infrastructure to handle message volume while expanding a partner-led sales motion.

HeadquartersPortland, Oregon

Company Size201–500 employees

Founded2012

Hiring MarketsUnited States

Frequently Asked Questions

What tech stack does Customer.io use?

Go and React on the backend and frontend, with AWS and GCP for infrastructure, MySQL and Snowflake for data, and TypeScript/JavaScript for additional services. Integration layer includes Salesforce, Marketo, Braze, Klaviyo, and Iterable.

Where is Customer.io headquartered?

Portland, Oregon. All hiring is currently in the United States.