Senior Software Engineer

About Upsun (formerly Platform.sh)

Upsun is the cloud application platform humans and robots love. It is built for today’s hybrid teams, where AI agents write and test code and humans focus on solving the problems that really matter. Developers, DevOps engineers, and platform teams use Upsun to build, ship, and scale confidently without wrestling with backend infrastructure. We give you your time back. You get:

• Predictable performance, even at scale
• Secure, compliant environments by default
• Real-time observability and profiling built in
• Cloning, configuration, and provisioning in seconds
• AI-ready features that plug directly into your stack

The name says it all. "Up" means uptime, reliability, and acceleration. "Sun" reflects our follow-the-sun-support, a 24x7, globally distributed support team keeping the lights on while you rest. Our core belief is that software should power brighter solutions and greater innovation.

Upsunners are a remote, global workforce, and we thrive in a multicultural team. We are committed to open source and an open, welcoming environment. Our team spans the globe and the experience spectrum.

What's our commonality, our cultural fabric? A curious spirit and a thirst for knowledge; an eagerness for innovative ideas and cultures. We believe we can build anything together in an environment that frees you to do your best work.

Our values:

• We make a positive impact.
• We aim for the stars.
• We care for each other.

Impact of a Senior Software Engineer

As a Senior Software Engineer at Upsun, you are part of the core engineering team building and maintaining the low-level orchestration components that power our cloud platform. You directly impact the reliability, scalability, and efficiency of the environment for customers running complex applications. You balance day-to-day maintenance of our stable, pre-established systems with the strategic execution of modernizing our base orchestration layer from Python to Go. Your work enables seamless cross-functional operations across our global infrastructure, solving highly complex challenges involving asynchronous networking, distributed coordination, and performance-critical systems. This role reports to the Director, Software Engineering.

What to expect

• Core Projects: Work on improving and maintaining our orchestration engine and git interface, ensuring they meet high standards of performance, reliability, and security.
• Daily Tasks: Work on product or internal features (like reducing dependencies or improving our internal telemetry), extending our testing suite, or releasing our components.