Senior Software Engineer - US Payments and Partner Operations

The US Payments & Partner Operations (PPO) team owns the core money-movement stack for the Raisin US platform: ACH payment initiation, reconciliation, returns, and cut-off scheduling, plus the customer accounts lifecycle. As a Senior Software Engineer, you will own and deliver features and bug fixes end-to-end with minimal guidance, identify and address bottlenecks in the team's delivery flow, and contribute to improving how we program, test, review, and ship code.

What you'll do

• Own and deliver features and bug fixes end-to-end with minimal guidance.
• Identify and address bottlenecks in the team's delivery flow, from design to deployment.
• Utilize AI tools intensively for increasing our ability and pace to deliver software.
• Promote best practices around our core stack.
• Transfer knowledge proactively, lead by example in learning and mentoring.
• Contribute to improving how we program, test, review, and ship code.
• Provide constructive code review and solve complex problems together.
• Contribute meaningfully to new feature design and implementation.

What you'll need

• Designing, optimizing, and maintaining robust enterprise APIs using .NET Web API.
• Building and structuring web applications with .Net.
• Strong relational database design, complex querying, and performance tuning in SQL Server.
• Deep understanding of SOLID principles and a proven track record of writing Clean Code.
• Practical experience working within modern architectural patterns, specifically Clean / Onion Architecture.
• Fast Learner: You don't mind stepping out of your .NET comfort zone to touch a React component or a Go microservice.
• Highly analytical with a strong focus on detail and quality.
• Team-first peer who thrives on open communication and cross-layer collaboration.

Nice to have

• Experience building user interfaces with React JS, JavaScript, and HTML, accompanied by testing tools like Jest or React Testing Library.
• Exposure to environments like Node.js, GoLang, or Java / Spring Boot, and building APIs.
• Experience with GraphQL.
• Working knowledge of MongoDB or NoSQL Databases.
• Familiarity with NUnit for automated testing and secure authentication via OAuth and ASP.NET Identity.

What they offer

• Employee Development Budget of €2,000 and four full training days per year.
• Flexible working hours, home office and 30 vacation days.
• Company pension scheme (Betriebliche Altersvorsorge) with 20% support.
• Urban Sports Club membership subsidy of €20+ per month.
• Deutschland Ticket subsidy of €25 per month.
• Office snacks, daily fresh fruit and drinks provided.