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.

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. "Our core belief is that software should power brighter solutions and greater innovation. Upsunners are a remote, general workforce, and we thrive in a multicultural team. What's our commonality, our cultural fabric?

Impact of a Senior Software Engineer As a Senior Software Engineer at Upsun, you will design and build the backend services behind our customers' billing, and help the engineers around you do their best work.

Billing is your main focus: invoices, taxes, usage reporting, and the integrations that connect our platform to the commercial systems behind it. You will own complex components end to end, make the design decisions behind them, and spot where they can be improved. Working closely with Finance, Product, and Support, you will turn commercial requirements into reliable services.

This is a hands-on role: most of your time goes into designing and writing code that customers rely on every time they're billed.

Design and build billing services: Design, build, and maintain backend services and API integrations in Go that connect our platform to external billing systems.





Own complex features end to end: Lead the design and delivery of usage-based billing features such as usage aggregation, estimates, usage alerts, and invoicing, from technical design to production. Shape the architecture of the components you own, weigh trade-offs, and balance short-term delivery with long-term reliability.

Protect customers and data: Contribute to anti-abuse measures and apply security best practices to sensitive customer and payment data. Support other engineers through code review, pairing, and mentoring, and help keep the bar for quality high. Deep professional backend development in Go, building services in distributed systems.

Experience designing backend systems and making architecture decisions that held up in production.

Relational databases: Strong experience with relational databases such as PostgreSQL or MySQL/MariaDB, including data modeling, migrations, and performance. A track record of integrating third-party APIs where you don't control the contract, the rate limits, or the uptime, with strong instincts for idempotency, retries, and consistency.

Accuracy and testing: Experience in domains where correctness matters, such as billing or payments, and a commitment to testing failure paths.



A solid understanding of common vulnerabilities and of security considerations in payment and billing systems.

Interest in billing: You enjoy working on billing and financial systems and want to make them your focus.

Experience with commercial billing platforms or e-commerce systems, including open source ones. 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.

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. 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. Make the most of what matters to you 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 If you need accommodations at any stage of our hiring process, please let us know.

📌 Senior Software Engineer - DevOps (La Mancha)
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📍 La Mancha