Senior Software Engineer

About Us

At Medius, we believe managing finance should be about strategy, not stress. That same mindset shapes not only the solutions we build, but also the culture we create for our people. We remove complexity, embrace innovation, and give our teams the freedom to focus on what truly matters — whether that’s transforming the future of finance with AI or finding balance to go home on time.

Founded in Sweden in 2001, Medius has grown from a local startup into a global leader in cloud-based spend management solutions. Today, thousands of organizations worldwide trust us to simplify accounts payable and spend management processes. Our journey has been driven by continuous innovation, a passion for technology, and above all — the people who make it happen.

We’re more than a software company. We’re a team of problem-solvers, innovators and collaborators working together to reinvent the category of accounts payable. Our solutions use Artificial Intelligence to eliminate manual work, bring clarity, confidence, and control, and empower finance teams of the future.

At Medius, our values guide how we work and grow together:

• Connect – We believe in the power of people—individually and collectively—and our success depends on understanding and respecting each other. We appreciate that ‘empowering finance teams of the future’ is an exciting endeavor, and we share it with everyone around us.

• Question – We enjoy the challenge of our work and the thrill of collaboration. We are not afraid to question ourselves and each other because we believe diverse perspectives can lead to better outcomes and that there is great power in resolution.

• Own – We are thorough, thoughtful, and decisive. We anticipate what’s next, what a customer might need, and then we deliver. That’s how we get things done. And that’s how we remain a leader. Customers trust us to do our job so that they can focus on what they do best.

At Medius, you’ll join a diverse, global community where curiosity is celebrated, ideas matter, and innovation never stops. If you’re passionate about technology, eager to make an impact, and ready to grow alongside a team that lives its values, Medius is where you can do your best work — your impact is global.

Learn more at www.medius.com

Job overview

We are looking for a highly skilled Software Engineer to join our Kraków-based team as we scale our next-generation, true cloud service. Supporting over 1,000 global clients, our main platform is built on a modern stack of Azure, .NET Core, React, and TypeScript. In this role you will do more than write code; you will influence the product’s future by designing scalable solutions and championing the integration of AI to revolutionize our development lifecycle. Success in this role means balancing high-velocity feature delivery with long-term architectural health.

Responsibilities and Duties

• Architect and develop scalable, high-quality cloud services, ensuring they meet the demands of a global client base.

• Master Domain-Driven Design (DDD) principles to build modular, maintainable, and highly performant software components.

• Drive AI Integration with use of AI tools (e.g., GitHub Copilot, LLM-based assistants) to automate code generation, refactoring, documentation, and unit testing.

• Design RESTful Web Services that facilitate seamless communication within our complex cloud infrastructure.

• Optimize Azure Services to ensure our infrastructure is not only performant and scalable but also cost-effective and secure.

• Collaborate within cross-functional teams of engineers, product owners, and designers, fostering a culture of mutual support and accountability in an agile environment.

• Champion code excellence by implementing best practices in code testing, maintaining quality standards, and providing insightful code reviews.

• Innovate and automate by investigating emerging technologies and AI trends to reduce manual overhead and accelerate team velocity.

Qualifications

• Experience: 4+ years of professional experience in software development, with deep proficiency in C# and .NET technologies.

• Frontend proficiency: solid hands-on experience with React (or similar frameworks) and TypeScript/JavaScript.

• Architectural expertise: proven experience with (or deep understanding of) DDD and CQRS patterns.

• Practical experience in designing,