Full Stack Software Engineer ( Java/Kotlin+AI)

About CoreWillSoft GmbH
 

CoreWillSoft GmbH is a German-based company developing secure IoT software solutions. Our mission is to help businesses protect their assets, employees, and data by delivering advanced solutions in the security domain.

About the Role:

We are looking for a Full Stack Software Engineer with strong backend expertise in Java or Kotlin, frontend experience, and hands-on experience using AI tools in software development.

You will be part of a distributed engineering team working across Europe, contributing to the full software development lifecycle — from ideation to deployment and operation of secure IoT solutions used in smart buildings and smart homes globally.

The role is backend-focused (~70%), with frontend involvement depending on your experience.

What You’ll Do:

• Design, develop, and maintain scalable backend services using Java/Kotlin and Spring Boot;
• Contribute to frontend development using React, Angular, or Vue.js;
• Actively use AI tools (e.g., Claude, Copilot, ChatGPT) to improve development efficiency, code quality, and solution design;
• Participate in architectural decisions and contribute to system design;
• Collaborate closely with product and business stakeholders to deliver impactful solutions;
• Take ownership of features from concept to production;
• Ensure performance, scalability, and security of applications;

• Work with cloud infrastructure and modern DevOps practices.

   

Your Skills:

Backend:

• Strong experience with Java and/or Kotlin;
• Solid experience with Spring Boot;
• Experience designing and building microservices architectures;
• Experience with RESTful APIs;
• Knowledge of scalability, performance optimization, and high-load systems;
• Experience with Docker and containerized applications;
• Familiarity with cloud platforms (AWS, Azure, or GCP);
• Experience with CI/CD pipelines (GitHub Actions, GitLab CI, etc.);
• Experience with relational and NoSQL databases (e.g., PostgreSQL, MongoDB);
• Understanding of secure coding practices and backend security principles;

• Familiarity with monitoring and observability tools (Prometheus, Grafana, ELK).

   

Frontend:

• Experience with React, Angular, or Vue.js;
• Understanding of modern frontend development practices;
• Ability to build and integrate UI with backend services;

AI & Modern Development:

• Hands-on experience using AI tools in development workflows (e.g., Claude, GitHub Copilot).
• Experience applying AI for:
  • code generation and refactoring;
  • debugging and optimization;
  • solution design and problem-solving;
• Understanding of how to effectively integrate AI into daily engineering workflows.

Nice to Have

• Experience with Kotlin Multiplatform or Android development;
• Knowledge of cryptography and security systems;

• Experience in IoT, SaaS, FinTech, or high-load systems.

   

What We Offer:

• Meaningful Impact: Build solutions used daily by thousands of businesses in critical industries;
• Ownership: Real influence on product and technical decisions;
• Modern Stack: Work with cutting-edge technologies and hardware;
• Flexible Work: Remote-first, full-time, long-term B2B cooperation;
• Learning & Development: Budget for courses and certifications;
• Coworking Support: Compensation for flexible workspace options;
• Language Learning Support: Improve your English or German;
• Team Culture: Flat structure, open communication, strong engineering culture.