Senior Backend Engineer (C#/.Net) (m/w/d)

We are looking for a

Senior Backend Engineer (C#/.Net) (m/f/d)

(unlimited, full-time) Join our team at our location in Berlin – hybrid working conditions available.

(Y)our Mission:
Our solutions contribute to flexible and customer-friendly payment alternatives. We offer consumers the opportunity to choose when and how they want to pay, whilst guaranteeing a steady and predictable cashflow for merchants. Our products make us proud, but not content and we have high ambitions for our existing as well as upcoming products. We have a strong commitment to building the future of FinTech — human-centric and sustainable. With investments to back it up. You will be part of a new and quickly growing product & tech organisation, having the opportunity to shape our new teams as well as build the next revolutionary products.

Your key responsibilities

You will join one of our product teams and on a daily basis:

• Design, develop, test, and deliver robust, maintainable software and APIs.
• Contribute to architecture and system design through ADRs and reviews.
• Participate in agile ceremonies to align with cross-functional teams.
• Translate business needs into practical, documented technical solutions.
• Apply best practices in CI/CD, observability, and security.
• Identify and resolve technical debt to improve system reliability.
• Mentor peers and foster a collaborative learning culture.
• Measure and improve engineering impact using key metrics.
• Maintain clear, up-to-date documentation for all components.

What you bring

• 5+ years of hands-on experience with C# and the .NET framework.
• Skilled in developing and maintaining cloud-based applications.
• Experienced with microservices and distributed architectures.
• Strong knowledge of RESTful API design and best practices.
• Proficient in SQL Server and Entity Framework (or similar ORMs).
• Familiar with cloud platforms; Azure experience preferred.
• Knowledge of messaging systems such as RabbitMQ or Kafka.
• Fluent in written and spoken English.
• FinTech or banking industry experience is an advantage.

Please note, that you need EU citizenship and/or a valid work permit for Germany.

About the technologies we use:

Our teams have autonomy when it comes to tech choices. The example below will give you some insights, and we are looking forward to discussing this further with you.

All solutions developed cloud-native targeting Azure - Infrastructure defined using Terraform - Services deployed to Kubernetes clusters by default - A growing microservice ecosystem with event-based integration - Using latest .NET Core - RESTful API design - Single-page frontend apps served by CDN - Frontend tech using TypeScript, often Angular or standard Web Components (Stencil) - Automated tests in each layer - Design collaboration using Figma.