Senior Fullstack Developer (.NET)

Springtime Technologies is growing rapidly, and we're looking for a Senior Fullstack Developer with a strong backend focus on .NET to drive the next evolution of our platform.

In this senior hands-on role, you'll shape the technical direction of our backend architecture while contributing across the full stack. You will design scalable services, build robust APIs, and ensure system reliability - while collaborating closely with frontend engineers to deliver seamless, high-performance user experiences for our SaaS platform used by customers worldwide.

As a technical mentor, you'll support other engineers, elevate engineering standards, and ensure our solutions remain scalable, secure, and maintainable - without direct people management responsibilities., * Lead backend architecture design using .NET (Core / .NET 6+), ensuring scalability, performance, and maintainability.

• Design, build, and optimize RESTful APIs and service integrations that power our SaaS platform.

• Own database design and data modelling decisions (SQL Server or similar). Ensure clean architecture principles, domain-driven design practices, and proper separation of concerns.

• Collaborate with frontend developers (React.js) to define API contracts and enable efficient integration.

• Establish and enforce coding standards and best practices across backend and fullstack development.

• Perform code reviews and provide constructive technical feedback. Mentor engineers and guide technical decision-making.

• Work closely with DevOps to ensure reliable CI/CD pipelines, containerized deployments (Docker), and monitoring strategies.

• Contribute to performance optimization, system security, and scalability improvements. Act as the technical point of contact for backend-related decisions in cross-functional discussions.

Do you have a Master's degree?, * Bachelor's or Master's degree in Computer Science (or equivalent professional experience).

• 5+ years of professional experience with .NET / .NET Core in backend development.

• Strong experience designing and building RESTful APIs and distributed systems. Solid understanding of C#, ASP.NET Core, Entity Framework, and modern backend architecture patterns.

• Experience working with relational databases (e.g., SQL Server).

• Experience with frontend technologies (preferably React.js, TypeScript) and fullstack collaboration.

• Familiarity with state management patterns and API integration from frontend to backend.

• Experience with testing frameworks (xUnit, NUnit, integration testing).

• Understanding of CI/CD pipelines and experience working in containerized environments (Docker).

• Hands-on experience with Atlassian Jira and Confluence. Fluent in English, spoken and written.

The minimum gross salary for this position is €3.843 per month, as determined by the IT Collective Agreement. The actual salary will be based on your qualifications and experience.

Springtime Technologies is a provider of AI-based cloud solutions for accounts payable automation serving multi-national companies in the manufacturing, pharmaceutical and chemical industries. We enable our customers to automate the incoming invoice process on a global scale. More than 120,000 business users in 70 countries use our cloud software already. The company was founded in 2004 by a team of AI experts and has offices in Germany, Austria, and the Philippines.