Senior Software Engineer, Backend

at Customer.io

📍 Switzerland
📍 Germany
📍 Spain
📍 France
📍 United Kingdom
📍 Netherlands

USD 150,000-200,000 per year

SENIOR

✅ Remote

Tech Stack
Tag name is followed by "@" symbol and proficiency level value. About proficiency levels:

1-2 — basic awareness. Minimal hands-on experience, and a rudimentary understanding of the technology's purpose;

3-6 — daily use. Comfortable and regular usage, capable of handling common tasks and challenges related to the technology;

7-9 — you are an expert, you can teach others, you know all the pitfalls and tricks;

10 — exceptional knowledge, comprehensive understanding, and adeptness in all aspects of the technology, including advanced problem-solving. Think twice before claiming or demanding such level.

AI AWS @ 4 Communication @ 4 Distributed Systems @ 7 GCP @ 4 Go @ 7 MySQL @ 3 Observability @ 4 React

Details

Customer.io is looking for an experienced backend engineer to design, build, and evolve reliable, high-performance, scalable systems that power communication at massive scale.

About Customer.io

Customer.io's platform is used by more than 8,000 companies to send billions of emails, push notifications, in-app messages, and SMS messages every day. The platform uses real-time behavioral data to help teams send relevant automated communications. Its technology stack includes Go, React, Ember, and AI.

Responsibilities

Design and build distributed systems in Go that help customers send timely, relevant messages at scale.
Collaborate across teams to debug issues and deliver reliable solutions.
Own problems end to end, including architecture and schema design, testing, deployment, and monitoring.
Share knowledge and raise the engineering bar through short public videos, thoughtful writing, and mentorship.
Use AI agents to make multi-file changes by scoping the work, writing prompts, and verifying the output.
Take ownership of complex projects and technical decisions.
Apply product thinking when building systems that deliver customer value.

Requirements

7+ years of experience building scalable, distributed systems in Go or similar statically typed languages.
Experience working in cloud-native environments such as AWS or GCP.
Familiarity with relational databases, particularly MySQL, and an understanding of performance tradeoffs.
Experience with observability tooling and operating production systems.
A bias for action, comfort with ambiguity, and pride in owning technical decisions.
The role involves a recruiter call, behavioral interview, technical system design interview, take-home assignment, and assignment review call.
Final candidates must complete a background check and employment verifications.

Benefits

Starting salary of $150,000–$200,000 USD, or equivalent in local currency, depending on experience and subject to market rate adjustment.
Medical, dental, vision, mental health, and supplemental insurance premiums fully covered for employees and their families.
16 weeks of paid parental leave.
Unlimited paid time off.
Remote work and wellness stipends.
Professional development budget.
Inclusive team culture and bias-free hiring practices.