Software Engineer (m/f/d) – Backend & Platform | AI-First Engineering

Job description We are modernizing a business-critical Payroll platform and building the foundation for a more scalable, service-oriented and AI-enabled product. This is a software engineering role, not an AI/ML engineering role . We are looking for experienced engineers who are strong in backend and platform development and who already work, or want to work, in an AI-first engineering environment . AI-assisted development is part of the normal engineering workflow: understanding existing systems, exploring solutions, writing and reviewing code, creating tests, documenting decisions and accelerating delivery. You will work on gradually transforming an established, business-critical product without disrupting the proven Payroll logic behind it. Your tasks Design and build modern backend services and platform capabilities around an established Payroll product Build APIs and integration points that allow Payroll capabilities to be used by modern applications and workflows Modernize the product incrementally rather than through a big-bang rewrite Work closely with existing engineers and Payroll domain experts to understand and safely evolve proven business logic Establish strong engineering practices around automated testing, observability, code quality and maintainability Use AI throughout the software development lifecycle to: understand unfamiliar and complex codebases analyse dependencies and behaviour explore solution options accelerate implementation generate and improve tests review code and documentation Help define how AI-first software engineering should work in practice across the team Collaborate with external Web/UI engineers while ensuring that core product architecture and engineering quality remain owned internally Contribute to technical architecture and modernization decisions Your profile Several years of professional software engineering experience with strong backend development skills in a modern programming language and ecosystem Experience designing APIs, services and integration-oriented systems, with a solid understanding of software architecture, clean boundaries and maintainable system design Comfortable working with existing or complex systems – not only greenfield products – and taking ownership from technical problem through implementation and production Strong automated-testing mindset and excellent communication skills, with a willingness to work closely with product and domain experts Practical experience using modern AI coding tools or engineering agents as part of day-to-day development, combined with the ability to judge AI-generated output critically Particularly valuable Experience in one or more of the following is a plus: modernization of large or long-lived software products, strangler/incremental migration approaches, cloud and container-based environments, asynchronous processing, high-compliance or business-critical software (e.g. Payroll, HR or financial), legacy integration, or developer platforms and internal tooling. Experience with C#/.NET, especially for backend services, APIs or modernization of established applications. We are not looking for someone whose primary skill is a specific legacy technology, we are looking for engineers who can help us progressively move beyond it. Your benefits Collaboration within an empathetic and supportive team You can put your knowledge and personal strengths to good use, and continue to develop your skills and grow You’ll start with a structured onboarding process and learn ‘on the job’, through training sessions or informal learning formats and working in interdisciplinary and international teams You’ll have the opportunity to benefit from our hybrid work concept, which includes working in the office, from home, on the move and on workations A modern tech stack and agile working methods are a given A wide range of benefits, e.g. pension scheme, health management – right through to staff discounts Well-behaved dogs are very welcome at all our locations I look forward to receiving your application Svenja Krüßel D-49835 Wietmarschen-Lohne Tel.: 0170-7888740 E-Mail: