Fullstack Software Engineer (Backend + Frontend)

CoreWillSoft GmbH is a German-based company working on secure IoT software solutions and services. The mission of CoreWillSoft is to help businesses protect their assets, employees, and data by providing advanced software solutions and services in the security industry.

We are looking for a Full-Stack Software Engineer with strong backend experience in Kotlin/Java and solid Frontend expertise.

Tasks

You will work on products used by businesses across Western Europe.

Our team operates in a scaled agile approach across Europe with a headquarter in Bonn, Germany. It is responsible for the complete software development lifecycle; including ideation, implementation, and operation of the secure IoT software operating smart buildings and smart homes across the world.

Requirements

Your skills:

• Backend:
• Proficiency in Kotlin and/or Java for backend development
• Strong experience with the Spring Boot framework
• Experience with Docker and containerized applications
• Familiarity with cloud platforms such as AWS, Azure, or Google Cloud
• Experience in designing and consuming RESTful APIs
• Knowledge of microservices architecture and patterns
• Experience with on-premise and cloud-based deployments
• Proficiency in secure coding practices and understanding of security bestKo practices for backend systems
• Familiarity with scalability strategies and performance optimization in backend services
• Knowledge of monitoring and observability tools (e.g., Prometheus, Grafana, ELK)
• Knowledge of cryptography and security
• Familiarity with CI/CD processes, including GitHub Actions, GitLab CI, or similar tools
• Experience with version control systems (e.g., Git)
• Experience with database technologies, both relational (e.g., PostgreSQL) and NoSQL (e.g., MongoDB).
• Frontend :
• Strong experience with React.js or Angular, or Vue
• Solid knowledge of TypeScript / JavaScript, HTML5, CSS3
• Experience with modern tools (Vite, Webpack, npm, etc.)
• Understanding of state management (e.g., Redux).

Nice to have:

• Experience building desktop applications
• Experience with Kotlin Multiplatform in production
• Knowledge of the modern Kotlin ecosystem (Coroutines, Flow, Compose, Koin, Ktor )
• Knowledge of additional programming languages
• Experience with system architecture and distributed systems
• Understanding of UI/UX design and performance optimization
• Knowledge of building automation or access control systems

Benefits

We offer:

• Great customer impact: the solutions you deliver will be used by thousands of large and small businesses
• Ability to shape the product, working, and delivery process
• Great team spirit and Team Events
• Agile and innovative environment
• Cutting-edge technologies
• Working on the latest Hardware
• Convenient office or co-working, depending on your location.

Join us to work on cool and innovative projects involving high-security hardware in a nice international and creative environment that allows you to learn and advance.