Kotlin developer Jobs in Köln

Our client is the comparison portal. They are the market leader and a dynamic startup. In agile teams, they make quick decisions and operate with flat hierarchies. Through the targeted use of cutting-edge tools and technologies , as well as state-of-the-art AI methods, they drive data-driven innovation – always with a focus on added value for customers. Every day, they work on more than 50 products to continuously improve the user experience for their over 20 million customers.

The departmnet is responsible for client's mobile phone comparison service and is looking for a new team member.

Your tasks include

• Backend development: The design, development, and further development of backend functionalities using PHP and Symfony are your responsibility.
  
• Interfaces & Business Logic: The implementation of REST APIs and business logic is carried out in close coordination with the team.
  
• Feature development: Your tasks include contributing to features across multiple application layers – from the backend to the user interface.
  
• Frontend Implementation: You will be responsible for implementing frontend functionalities with React to utilize their backend services.
  
• Collaboration: Close coordination with product management, frontend development and other departments is an integral part of your work.
  
• Technical contribution: You actively participate in the further development of our web applications.
  

Requirements

• Qualifications: A completed degree in computer science or a comparable qualification forms your professional basis.
  
• Backend know-how: You have sound knowledge of backend development (such as PHP, Java, TypeScript, Node.js or Python).
  
• Framework experience: You have already gained initial practical experience with a web framework (e.g., Symfony, Spring Boot, Express, Django/Flask or similar).
  
• Web architecture understanding: You are familiar with basic knowledge of web protocols such as REST and HTTP, as well as common standards for frontend/backend communication.
  
• Database knowledge: You will certainly use relational databases like MySQL in your daily development work.
  
• Web architecture understanding: You bring knowledge of REST APIs and modern web applications.
  
• Frontend basics: You have basic knowledge of HTML, CSS and JavaScript as well as initial experience with a modern frontend framework (e.g. React or Angular)
  
• Full-stack readiness: You are interested in implementing features in the frontend as well and developing yourself further in this area.
  
• Work style: You are characterized by a structured, independent work style and enjoy working together in a team.
  
• Language skills: Fluent German and English skills at least at C1 level complete your profile.
  

Benefits

Development and responsibility

• Your commitment pays off – they foster your talent and offer you rapid career advancement opportunities.
  
• Ownership of your topics – contribute your own ideas, try new things and take responsibility for real impact.
  
• Benefit from internal training by specialized coaches as well as an annual budget for external professional development.
  

Team spirit and modern workspace

• They foster team spirit in daily work and beyond – be it during shared lunches, foosball games or after-work get-togethers – and celebrate our successes at regular company and team events.
  
• An inspiring environment – their modern office offers high-quality equipment such as MacBooks and height-adjustable desks.
  

Flexibility and balance

• Adapt your work model flexibly to your life situation.
  
• With your free Germany ticket or a subsidized company bicycle, you can get to the office stress-free.
  
• Fresh lunches are provided free of charge several times a week – ideal for exchanging ideas with colleagues.
  
• Stay fit with our in-house sports classes or take advantage of the subsidized external sports program (including the EGYM Wellpass) for the perfect balance.