Senior Software Engineer, Full Stack

Stack

Responsibilities

• ▹Build fullstack features in Go, React and Ember that power key customer workflows
• ▹Collaborate with others to turn ideas into shipped customer value
• ▹Share knowledge through short videos, writing and mentorship
• ▹Help evolve systems to scale with more customers, messages and use cases
• ▹Use AI agents to make multi-file changes: scoping the work, writing the prompt, verifying the output

Requirements

• ▹7+ years of experience building and scaling backend services and product-facing features
• ▹Fluency in TypeScript, React (or similar) and a statically typed backend language like Go
• ▹Strong care for frontend polish, backend performance and overall customer experience
• ▹Proficiency with APIs, relational databases and writing testable, performant code
• ▹Bias for action over perfection, pride in owning technical decisions

Soft skills

What we offer

• ▹Starting salary $150,000-$200,000 USD, depending on experience
• ▹100% coverage of medical, dental, vision, mental health and supplemental insurance for employee and family
• ▹16 weeks paid parental leave
• ▹Unlimited PTO
• ▹Remote work and wellness stipends, professional development budget

About the company

Over 8,000 companies — from scrappy startups to global brands — use Customer.io's platform to send billions of emails, push notifications, in-app messages and SMS every day. Under the hood: Go, React, Ember and AI help ship fast and scale reliably.