(Junior) Backend Web Developer (m/f/d) Mobile Communications | (Junior) Backend Webentwickler (m/w/d) Mobilfunk

CHECK24 Services Personal GmbH

Köln, Nordrhein-Westfalen, Deutschland
Published Apr 7, 2026
Full-time
Permanent

Job Summary

As a (Junior) Backend Web Developer at CHECK24 in Cologne, you will join an ambitious IT team responsible for the mobile communications comparison portal. Your daily responsibilities include designing and developing backend functionalities using PHP and the Symfony framework, implementing REST APIs, and building complex business logic. Uniquely, this role offers a full-stack component where you will also implement frontend features using React to consume your backend services. You will work in an agile environment, collaborating closely with product management and other specialized departments to enhance the user experience for over 20 million customers. This position is ideal for early-career professionals looking for rapid growth opportunities, ownership of their projects, and a modern workspace equipped with high-end hardware and AI-driven methodologies. The role is further enhanced by a strong team culture including regular events, internal coaching, and a flexible working model.

Required Skills

Education

Completed degree in Computer Science or a comparable vocational training/qualification.

Experience

  • Initial professional experience in backend development using languages such as PHP, Java, TypeScript, Node.js, or Python
  • Practical experience with web frameworks such as Symfony, Spring Boot, Express, or Django/Flask
  • Experience working with relational databases, specifically MySQL
  • Experience or strong interest in frontend development with modern frameworks like React or Angular

Languages

German (Fluent)English (Fluent)

Additional

  • Verhandlungssicher (C1 level) proficiency required in both German and English; Location: Cologne, Germany.