Senior Software Engineer

Location: Remote • Canada

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.
Team Collaboration: Work closely with product, security, and infrastructure teams on container orchestration solutions that align with company goals and customer needs.
Challenging Problems: Build backwards compatible solutions to complex problems while optimizing services to run efficiently and troubleshooting when deployments fail.
Drive Innovation: Constantly seek opportunities to improve automation, testing, and deployment processes.

What you bring

Strong software engineering background with proficiency in Python and Go.
Comfort working on low-level systems.
Proficiency in asynchronous programming and concurrency models in Python or similar languages.
Strong expertise in Linux systems and internals, including process management, networking, containers, and file systems.
Production experience with containerization technologies (Docker, OCI images, LXC etc.).
In depth knowledge of Git protocol including how repositories work.
Comfort with debugging complex systems, including going through traces and logs.
Pragmatic problem-solving skills employing practical solutions to overcome complex problems efficiently.
Hands-on experience with AI coding assistants and LLM APIs including applying them to code review, documentation, and debugging.
Excellent communication skills with ability to engage in discussions, accept feedback, and share knowledge with diverse audiences.

Bonus Points

Knowledge of orchestration platforms such as Kubernetes (K8s).
Experience with GitLab CI/CD pipelines.
Experience working in PaaS or cloud-based environments.
Experience with high availability architectures and fault tolerance.

Where we hire

At Upsun remote work isn't just a trend - it's our foundation. The freedom of remote work with the support of a diverse global team has been our successful model for over a decade. Our culture celebrates flexibility and collaboration; while we have team members in over 30 countries around the globe we are currently focused on hiring for this role in Canada. Although we’re unable to provide visa sponsorship at this time we welcome applications from all qualified candidates who are legally authorized to work in these countries.

How we hire

You can expect 4 interviews on Google Meet:

45 Minutes with Talent Acquisition
60 Minutes with Hiring Manager / Director / Software Engineering
60 Minutes with Team (ICs)
45 Minutes with Executive (VP Software Engineering)

All roles require background checks.

What we offer

💡 A product you can believe in - Join us transforming how businesses build/manage web apps as a proud B Corp. 🏆 An Award-Winning Workplace - Recognized by Forbes’ Top 30 Companies for Remote Jobs & France’s Best Workplaces for Women. 🗣️ A culture that values your voice - Flexible open inclusive environment where your ideas shape growth. 🌎 A global team - Collaborate across diverse backgrounds worldwide. 🎉 Benefits & perks: > 🏝 Flexible PTO > 🩺 Comprehensive healthcare coverage (UK/Canada/France/Spain/USA) > 📈 Company stock options > 🧠 Professional development budget > 💻 Office equipment budget > 💆‍♀️ Wellness budget > 🧳 Annual team gatherings > 🛜 Internet reimbursement > 👶 Inclusive parental leave > ✈️ Remote work travel program

You belong here

We celebrate diversity & foster an inclusive equitable supportive workplace where everyone thrives regardless of background or path taken.