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 Software Engineer, AI

As a Software Engineer, AI at Upsun, you design, build, and deploy AI-driven solutions that directly shape how our customers work and grow. You collaborate closely with the Principal Engineer to transform cutting-edge models and tools into practical applications that solve complex, real-world challenges. By blending your software engineering expertise with your deep knowledge of the evolving AI landscape, you expand the role of AI in our product empowering customers to build, deploy, and scale faster. Your work doesn’t just advance our technology; it accelerates the success of every business that relies on Upsun.

What to expect

• Design, build, and maintain backend services in Go (Golang) that power AI-driven agents.
• Integrate AI/ML models into production environments, including LLMs, decision-making systems, and reinforcement learning agents.
• Develop APIs and microservices for agent communication, orchestration, and lifecycle management.
• Implement concurrency, event-driven systems, and message queues to support scalable agent interactions.
• Ensure security, reliability, and observability with robust logging, monitoring, and alerting practices.
• Collaborate with Data and Product teams to turn prototypes into production-ready services, while shaping architecture decisions around frameworks, data management, and testing.
• Write clear technical documentation, champion Go development best practices, and contribute to a collaborative remote-first culture with pair programming and team sessions.

What you bring

• 3+ years of development experience in Go.
• Experience building applications that leverage foundation AI models.
• Strong awareness of the AI engineering landscape with the ability to learn and adapt quickly.
• A customer-focused mindset, solving real-world user problems through technology.
• Understanding of security considerations in both AI engineering and broader application development.

Bonus Points

• Background in PaaS development.
• Hands-on experience with RAG, MCP, or agent-based systems.
• Knowledge of integrating Continuous AI into development pipelines.

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 nearly a decade. Our culture celebrates flexibility and collaboration, and while we have team members in over 30 countries around the globe, we are currently focused on hiring for this role in France, Germany, Spain, and the United Kingdom 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

We know that a great hire won’t meet every requirement that we’ve outlined. If you can see yourself elevating the team, we want to hear your story. Few of us would be here had we not taken a chance.   

You can expect 4 interviews on Google Meet to follow the order below. Should you successfully move through the entire process you will have the opportunity to meet with a variety of Upsunners. Our goal is to ensure you can make the most informed decision on whether this role, and our culture aligns with what you’re looking for in your future working environment. 

1. 45 Minutes with Talent Acquisition 
2. 60 Minutes with Hiring Manager (VP, Engineering)
3. 60 Minutes with Team (Principal Engineer)
4. 45 Minutes with Executive (CTO)

All roles require background checks.

What we offer

💡 A product you can believe in - Join us in transforming how businesses build and manage web applications, driven making a positive impact as a proud B Corp.

🏆 An Award-Winning Workplace - We’ve been recognized by Forbes’ Top 30 Companies for Remote Jobs and France’s Best Workplaces for Women.

🗣️ A culture that values your voice - Join a flexible, open, and inclusive work environment where your voice is encouraged, and your ideas shape our growth and evolution.

🌎 A global team - Collaborate with colleagues from diverse backgrounds across the world, embracing different perspectives

🎉 Benefits and perks - Make the most of what matters to you

🏝 Flexible PTO

🩺 Comprehensive healthcare coverage (UK, France, Spain)

📈 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

At Upsun, we celebrate diversity in all its forms and are committed to fostering an inclusive, equitable, and supportive workplace where everyone can thrive. We embrace and value different perspectives, backgrounds, and experiences, because they make us stronger as a team. Whoever you are, wherever you're from, and whatever path you've taken, you are welcome here. We encourage you to bring your whole self to work, connect with others, and share your passion. If you need accommodations at any stage of our hiring process, please let us know. We're here to ensure an accessible and comfortable experience for you.