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Customer.io

Senior Fullstack SDK Engineer

Customer.io

Fullstack SDK Engineer at Customer.io building and evolving SDKs for multiple platforms. Leading SDK initiatives and improving developer tools with AI support.

Posted 7/21/2026full-timeRemote • 🇺🇸 United StatesSenior💰 $150,000 - $200,000 per yearWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expert-level competency in programming languages and experience in building production-quality software, with a strong focus on customer empathy and effective collaboration across teams. Proficient in utilizing AI agents and agentic coding tools to enhance SDK delivery and infrastructure.

Highest-signal resume keywords
Expert-Level Programming LanguageProduction-Quality Software DevelopmentFluency with Current LLMsStrong Communication SkillsHigh Autonomy in Ambiguous Environments

ATS Keywords

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Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills
Programming LanguageSoftware DevelopmentSDK DevelopmentAI AgentsAgentic Coding Tools
Soft Skills
Customer EmpathyWritten CommunicationVerbal Communication
Tools & Technologies
SDKsDelivery Infrastructure

About the role

Key responsibilities & impact
  • Build and evolve Customer.io's SDKs across platforms
  • Lead SDK initiatives end to end
  • Improve SDK delivery infrastructure
  • Partner closely with product and design
  • Use AI agents to make multi-file changes
  • Bring strong customer empathy to the role

Requirements

What you’ll need
  • Expert-level competency in at least one established programming language
  • Experience building and evolving mature, production-quality software
  • Exceptional fluency with current LLMs and agentic coding tools
  • High autonomy in ambiguous environments
  • Strong written and verbal communication skills
  • Ability to work effectively across multiple languages and stacks

Benefits

Comp & perks
  • 100% coverage of medical, dental, vision, mental health, and supplemental insurance premiums for you and your family
  • 16 weeks paid parental leave
  • Unlimited PTO
  • Stipends for remote work and wellness
  • A professional development budget