Customer.io is hiring a Senior Fullstack SDK Engineer to lead end-to-end SDK initiatives across platforms (Android, iOS, Node, Go), improve SDK delivery infrastructure (CI, testing, versioning, publishing), and use LLMs and agentic coding tools to work across codebases. The role emphasizes API and developer experience, high autonomy, and strong communication; compensation is listed at $150,000–$200,000 USD/year.

Customer.io seeks a Senior Software Engineer on the Platform team to design and evolve distributed systems in Go that handle billions of daily events, store petabytes of data, and ensure high availability and reliability. Role responsibilities include architecture decisions for performance and real-time event processing, improving service communication and APIs, tackling high-throughput data pipelines and queues, debugging production systems with instrumentation, and mentoring others. The role typically requires 10+ years of experience. Starting salary range listed as $150,000–$200,000 USD per year.

Customer.io seeks a GTM AI Engineer to take prototype AI agents to production-grade systems used by GTM teams. Responsibilities include writing evals, hardening prompts and tools, instrumenting tracing/logging/monitoring, maintaining deployment pipelines and environment parity on GCP, database administration for agents, and ongoing fleet monitoring and improvements. Required: 4+ years in software/platform/infrastructure engineering, comfort with terminal and GitHub PR workflows, cloud hosting (Kubernetes/VMs) with Google Cloud preferred, and familiarity with LLM-based development (prompting, tool calling, evals, agent frameworks).

Customer.io is hiring a Senior Software Engineer to own an email channel end-to-end. Responsibilities include building and evolving product-facing frontends and scaling backend systems that handle high volumes of messages (queues, event streams, rate limiting), integrating with external providers, and operating observability and monitoring. Requires 7+ years experience, strong Go or similar statically typed language skills, React frontend experience, cloud-native familiarity (AWS/GCP), and MySQL experience. Salary range provided: $150,000–$200,000 USD per year.

Customer.io is hiring a Senior Software Engineer (Backend) to design, build, and operate large-scale distributed systems in Go. The role requires 7+ years building scalable systems, experience with cloud-native environments (AWS/GCP), familiarity with MySQL, observability and operating production systems, and ownership of end-to-end architecture, testing, deployment, and monitoring. Salary range: $150,000–$200,000 USD/year.

Build and evolve distributed systems in Go to power large-scale messaging; own architecture, schema design, testing, deployment, and monitoring. Requires 7+ years building scalable distributed systems, experience with cloud-native environments (AWS/GCP), familiarity with MySQL and observability tooling, and strong focus on reliability and performance.

Customer.io seeks a Senior Software Engineer (Full Stack) to design, build, and ship core product experiences. Requires 7+ years experience building/scaling backend services and product-facing features, fluency in TypeScript and a statically typed backend language like Go, experience with React (or similar), APIs, relational databases, and a focus on frontend polish and backend performance. Compensation listed as $150,000–$200,000 USD/year.

Customer.io seeks a Senior Full-Stack Software Engineer to design, build, and ship core product experiences. The role focuses on full-stack features using Go, React, and Ember, with responsibilities including API integration, relational database work, performance and scalability improvements, system design, and using AI agents for code changes. Requires 7+ years building and scaling backend services and product-facing features. Position is remote across EMEA; listed starting salary $150k–$200k USD.