Senior Software Engineer, On-Premise

CircleCI; Toronto; On-site; CAD 152,000 - 191,000; Full time

Job summary

A leading CI/CD platform provider in Toronto is seeking a Sr. Software Engineer to design reliable distributed systems. You will mentor engineers, write maintainable Go code, and improve customer experiences. Strong skills in cloud services, Kubernetes, and testing are essential. The position offers a competitive salary range of $152,000 to $190,500 CAD.

Qualifications

• 5+ years of professional software development experience, including production experience writing code in Go.
• Deep proficiency in Go and experience delivering production‑quality software at scale.
• Strong testing skills with experience writing comprehensive unit, integration, and end‑to‑end tests.
• A production‑first mindset, with proven experience building, monitoring, supporting and debugging live distributed systems.

Responsibilities

• Design and build reliable, observable, zero‑downtime distributed systems that serve millions of builds across thousands of customers.
• Collaborate with cross‑functional teams to shape and refine self‑hosted Runners.
• Mentor junior and mid‑level engineers, providing technical guidance.
• Contribute to a culture of continuous improvement, helping your team and our customers succeed.

Skills

Go

Cloud services

Kubernetes

Observability

Testing

Collaboration

Tools

AWS

GCP

Honeycomb

Datadog

Grafana

Rollbar

Job description

Sr. Software Engineer

About CircleCI Engineering

At CircleCI, our engineering teams are the driving force behind the platform trusted by developers worldwide to build, test, and deploy their code with confidence. We operate at a massive scale, processing over 50 million builds per month for organizations ranging from innovative startups to industry‑leading enterprises. Our platform sits at a critical intersection in the software development lifecycle, where reliability, performance, and user experience directly impact the productivity of development teams around the globe.

As we continue to innovate, we’re increasingly leveraging AI to transform the software delivery experience. From intelligent test selection that reduces build times, to predictive analytics that prevent pipeline failures, to AI‑powered developer tools that streamline workflows, we’re using machine learning and artificial intelligence to solve complex engineering challenges. We believe AI represents the next frontier in CI/CD, enabling smarter, more efficient, and more reliable software delivery pipelines.

Your work at CircleCI directly impacts how software is delivered across the industry. When you contribute to our systems—whether they’re customer‑facing interfaces, core platform capabilities, or developer tools—you’re helping teams worldwide ship better code faster and with greater confidence. The systems you’ll help build enable innovation across the entire software industry, making you an essential part of the modern development ecosystem.

On‑Premise Team

This is an opportunity to join the team that maintains CircleCI’s on‑premise products. We deliver high‑availability, on‑premise CircleCI solutions that are easy to install, manage, and support in a secure, reliable, and maintainable manner. That includes our self‑hosted runners and CircleCI Server, an on‑premise CI/CD platform for enterprise customers who have compliance or security needs that require operation within a firewall, private cloud or data center.

What You’ll Do

• Design and build reliable, observable, zero‑downtime distributed systems that serve millions of builds across thousands of customers.
• Write clear, maintainable, and well‑documented Go code, with comprehensive unit, integration, and end‑to‑end tests to ensure long‑term reliability.
• Own your work from concept to deployment and beyond—debugging and improving production systems and infrastructure using tools like Honeycomb, Datadog, Grafana, and Rollbar.
• Collaborate with cross‑functional teams to shape and refine self‑hosted Runners and evolve the internal developer experience for supporting CircleCI server.
• Mentor junior and mid‑level engineers, providing technical guidance and helping grow engineering excellence on your team.
• Contribute to a culture of continuous improvement, helping your team and our customers succeed.
• Grow your strategic impact and technical influence across the organization, supported by mentorship and exposure to deep engineering challenges.
• Participate in and contribute to improving rotating on‑call duties, including incident management for on‑premises customers.
• Collaborate closely with our Customer Support team to understand the needs and challenges of our on‑premise customers.

What You’ll Bring

• 5+ years of professional software development experience, including production experience writing code in Go. Your broader background may span backend and infrastructure code.
• Deep proficiency in Go and experience delivering production‑quality software at scale.
• Experience with cloud services and virtualization, for example, AWS and GCP.
• Experience with Kubernetes, Helm Charts, and managing container‑based architectures, including orchestration, service‑discovery, monitoring, and debugging.
• Strong testing skills with experience writing comprehensive unit, integration, and end‑to‑end tests.
• Professional experience delivering platforms and providing a great developer experience for internal and external customers.
• A production‑first mindset, with proven experience building, monitoring, supporting and debugging live distributed systems in real‑world environments.
• A pragmatic engineering approach, solving problems efficiently while balancing complexity and maintainability.
• A collaborative spirit and a desire to grow, mentor, and lead alongside others.

Bonus Skills (Nice to Have)

• Experience delivering On‑premise software to Enterprise customers.
• Familiarity with observability and performance optimization practices.
• Experience in maintaining systems that run on multiple platforms, including Windows.

Canada Base Pay Range $152,000 — $190,500 CAD

We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Please contact us to request accommodation.

CircleCI is an Equal Opportunity and Aff…

CircleCI is an Equal Opportunity and Aff…

We also consider qualified applicants with criminal histories, consistent with applicable federal, state and local law.