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.

Team-Agnostic Placement

We hire team-agnostically at CircleCI, meaning we don’t recruit for a single team from the start. Instead, we get to know each candidate through the interview process and then place them on the team where their strengths, interests, and experience will make the greatest impact. This approach allows us to be thoughtful about matching engineers with the right challenges, and it gives new hires a stronger foundation for long-term success and growth. It’s part of our commitment to building balanced, high-performing teams that are set up to thrive.

By carefully matching your skills to the right team, we ensure you can make the most meaningful impact on systems that are critical to the success of development teams worldwide.

What You’ll Do:

• Collaborate with other engineers, product managers, and designers to build and evolve core systems.
• Write clean, testable, and maintainable code in Go, with comprehensive unit and integration tests that ensure reliability and long-term maintainability.
• Participate in code reviews, design discussions, and incident retrospectives—learning from more senior engineers while contributing your own insights.
• Help debug, monitor, and improve systems in production using tools like Honeycomb, Datadog, Grafana, and Rollbar.
• Grow your technical depth and system design skills in a fast-paced, supportive environment where iteration is key.
• Contribute to systems that directly impact developer productivity for thousands of teams around the world.
• Receive mentorship from senior engineers while taking on increasingly complex tasks that will help you grow toward senior-level responsibilities.

What You’ll Bring:

• 3+ years of professional software development experience, with a focus on backend systems.
• Production experience writing code in Go.
• Proven experience building and maintaining distributed systems in real-world production environments.
• Familiarity with Kubernetes and modern cloud infrastructure.
• A strong sense of ownership and curiosity—comfortable diving into complex systems and learning through iteration.
• A desire to write high-quality, maintainable code and contribute to a collaborative engineering culture.

Bonus Skills (Nice to Have)

• Interest in or exposure to AI/ML technologies and their applications in developer tools.
• Experience with test automation and CI/CD optimization.
• Knowledge of observability practices and performance analysis.