FullStack Software Engineer
Primary stack
Nice to have's
Job description
About the Position
CoreWillSoft GmbH, a German-based company specializing in secure IoT software solutions, is seeking a Full-Stack Software Engineer with strong backend experience in Kotlin/Java and either:
-
Solid Frontend (React) expertise, or
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Experience in Kotlin Multiplatform / Android development
You will work on products used by businesses across Western Europe, USA, and Canada. Our team operates in a scaled agile approach across Europe with a headquarters 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.
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.
Responsibilities
- Design and develop scalable backend services
- Write clean, maintainable code
- Collaborate with frontend team
- Work on products used by businesses across Western Europe, USA, and Canada
Requirements
Backend:
- Proficiency in Kotlin and/or Java for backend development
- Strong experience with 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 best 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 (one of the following paths is required):
Option 1 – Web 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)
Option 2 – Mobile / Multiplatform:
- Experience with Kotlin Multiplatform and/or Android development
- Strong knowledge of Kotlin Coroutines and Flow
- Experience with Jetpack Compose (or Compose Multiplatform)
- Familiarity with dependency injection frameworks (e.g., Koin)
- Experience with networking libraries such as Ktor
Nice to Have
- Experience with Kotlin Multiplatform in production
- Knowledge of 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
We Offer
- Meaningful Impact: Build solutions that are used every day by thousands of businesses. Your work will directly improve real-world security and connected device experiences.
- Product & Process Ownership: Help shape not only the product, but also how we build and deliver it. Your ideas and decisions will have visible impact.
- Industry Influence: Contribute to key security standards and best practices, staying ahead of the curve in a fast-evolving industry.
- Modern Tech Stack & Hardware: Work with the latest hardware and the tools you need to do your best work.
- Time Off & Flexibility: Vacation days, paid sick leave, and public holidays in line with German legislation plus flexibility built around outcomes, not micromanagement.
- Learning & Development Budget: We support continuous growth by covering hard and soft skills courses, trainings, and access to e-learning platforms.
- Coworking Support: Prefer not to work from home every day? We offer coworking compensation so you can choose the environment that fits you best.
- Language Learning Support: Monthly fixed compensation you can use to improve your English or German through the learning format of your choice.
- Strong Team Culture: Open collaboration, a flat structure, and thoughtful onboarding. Your voice is heard, and you can make an impact from day one.
About the Company
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.
© CoreWillSoft GmbH. This job description was sourced from the employer's public career page. TheJob is not the employer — we index the posting and route candidates to the source. All content rights and hiring decisions belong to the employer.
CoreWillSoft GmbH, headquartered in Bonn, Germany, is a leading innovator in the realm of secure IoT services. Since our inception in 2016, we’ve been at the forefront of developing cutting-edge software solutions for security technologies and consumer electronics. Our expertise spans across access control software, mobile and traditional solutions, and comprehensive technical and security audits, serving clients throughout Europe and North America.At CoreWillSoft, we specialize in:— Advanced Software Development: Crafting scalable and secure IoT solutions tailored to our clients’ needs.— Enhanced Device Security: Implementing robust security measures to protect devices and data.— Scalable Architecture Design: Designing systems that grow seamlessly with business demands.— Device Remote Management: Offering tools for efficient and secure device oversight.— Connectivity Reliability Solutions: Ensuring consistent and reliable device communication.— User Experience Development: Creating intuitive interfaces for optimal user engagement.— Standards Compliance Consulting & Audit: Assisting clients in meeting industry standards and conducting thorough audits.Our in-house solutions — like Tagware, NFC TagKit, and Universal Importer — reflect our drive to simplify and strengthen how businesses manage secure environments.Why Work With Us?We’re a growing team of professionals based across Europe who are passionate about building meaningful technology. Here’s what you can expect at CoreWillSoft:— Real Impact: You’ll work on projects that matter—helping shape the future of physical security industry and connected devices.— Industry Involvement: You`ll actively contribute to key security standards staying ahead of the curve and influencing best practices.— Time off & Flexibility: vacation days, covered sick-leaves & public holidays tailored to German legislation.— Equipment Support: We provide the latest hardware and other necessary devices to support your work.— Continuous Learning & Growth: We invest in your professional and personal development by covering costs for hard & soft skills courses, training programs, and access to e-learning platforms.— Work Environment: If you prefer working outside of home, we offer coworking compensation.— Collaborative Culture: We value openness, creativity, and contribution. Our flat structure and thoughtful onboarding process mean your voice is heard, your ideas matter, and your work makes a difference from day one.If you’re excited by technology that protects and connects, and want to work with a team that values innovation and quality, we are looking forward to hearing from you!