Senior Software Engineer - US Payments and Partner Operations (m/f/d)

Raisin is a FinTech platform connecting consumers with banks for savings and investments. The US Payments & Partner Operations team manages money movement, customer accounts, and B2B integrations. The role is for a Senior Full-Stack Engineer to own features, improve delivery, and mentor others.

• 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 ability and pace to deliver software.
• Promote best practices around the core stack.
• Transfer knowledge proactively, lead by example in learning and mentoring.
• Contribute to improving how we program, test, review, and ship code.
• Flag process gaps and propose pragmatic improvements.
• Elevate engineers in growing their technical skills.
• Provide constructive code review and solve complex problems together.
• Quickly build practical depth in PPO's domains.
• Contribute meaningfully to new feature design and implementation.
• Bring engineering perspective into domain discussions alongside Product Manager, Tech Lead, and Engineering Lead.

• 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 Clean / Onion Architecture to keep codebases decoupled and testable.
• Fast learner willing to step out of .NET comfort zone to touch React or Go microservices.
• Highly analytical with strong focus on detail and quality.
• Team-first peer who thrives on open communication and cross-layer collaboration.
• Experience building user interfaces with React JS, JavaScript, and HTML, with testing tools like Jest or React Testing Library.
• Exposure to 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.
• Familiarity with secure authentication via OAuth and ASP.NET Identity.

• Employee Development Budget of €2,000 and four full training days per year.
• Flexible working hours, home office and 30 vacation days.
• A company pension scheme (Betriebliche Altersvorsorge), which we support with 20%.
• Enjoy more than 50+ different sports with Urban Sports Club: We subsidize your membership with more than €20 per month.
• The Deutschland Ticket gets you there, which we subsidize with €25 per month.
• With JobRad, lease the bike of your choice and enjoy tax savings, plus Raisin covers your monthly insurance costs.
• Snacks, daily fresh fruit as well as drinks provided at the office.