Developer Experience Engineer

About the company

• Over 9,000 companies use Customer.io to send billions of emails, push notifications, in-app messages, and SMS every day.
• Under the hood: Go, React, Ember and AI.

Responsibilities

• Build and evolve Customer.io's SDKs across platforms including Android, iOS, Node, and Go, and the developer tools that support them.
• Lead SDK initiatives end to end: set technical direction, write the code, manage the release, and own the outcome.
• Improve SDK delivery infrastructure: CI, automated testing, versioning, publishing, and release processes.
• Partner closely with product and design to turn loosely defined goals into a great developer experience.
• Participate in an on-call rotation.
• Use AI agents to make multi-file changes across unfamiliar codebases and languages.
• Bring strong customer empathy, occasionally engaging directly with integrating engineers.

Requirements

• Expert-level competency in at least one established programming language, with strong software design and API design fundamentals.
• Experience building and evolving mature, production-quality software.
• Exceptional fluency with current LLMs and agentic coding tools (e.g., Claude, Cursor, Codex).
• High autonomy in ambiguous environments.
• Strong written and verbal communication.
• Ability to work across multiple languages and stacks; prior experience in every supported language (Swift, Kotlin, Node, Go) is not required.

Nice to have

• Experience building external-facing SDKs, APIs, or developer tools.
• Experience owning CI, testing, versioning, or release infrastructure.
• Forward-deployed engineering experience.

Conditions

• Starting salary $150,000 - $200,000 USD plus equity in the form of stock options.
• Benefits include 100% coverage of medical, dental, vision, mental health, and supplemental insurance, 16 weeks paid parental leave, unlimited PTO, remote work and wellness stipends, and a professional development budget.