Android Mobile Application Developer

Permanent employee, Full-time · Budapest

Your mission

Are you an enthusiastic senior mobile application developer, ready to take the next step in your career?

You like exciting projects, using new development technologies? 

Interested in the telecommunications industry?


As a member of our team you will contribute to the continuous development, design, documenting and testing of the IT systems developed and operated by our telecommunications company.

Your profile


  • Mobile App Development: Design, build, and maintain advanced applications for the Android platform using Kotlin, Java (for Android).
  • User Interface Design: Collaborate with UI/UX designers to implement appealing and user-friendly interfaces while ensuring a seamless user experience across different devices and screen sizes.
  • API Integration: Integrate RESTful APIs, third-party libraries, and services to fetch data, authenticate users, and enable various functionalities within the mobile applications.
  • Code Optimization and Performance: Optimize application performance, including speed, memory usage, and battery consumption, to ensure smooth and efficient operation on various devices.
  • Testing and Debugging: Conduct thorough testing of applications to identify and fix bugs, performance issues, and security vulnerabilities. Perform debugging and troubleshooting to resolve issues promptly.
  • Version Control: Utilize version control systems like Git to manage source code, track changes, and collaborate effectively with team members.
  • Documentation: Document codebase, APIs, and development processes to facilitate seamless collaboration, knowledge sharing, and future maintenance.
  • Platform-Specific Guidelines: Stay updated with platform-specific guidelines, best practices, and new features introduced by Google, ensuring compliance and leveraging the latest capabilities.


Required qualifications and skills

  • 5+ years working in UI development.
  • Proven experience in mobile app development for Android, with a strong portfolio showcasing relevant projects.
  • Solid understanding of mobile UI/UX principles and experience with UI frameworks such as Material Design (Android).
  • Skills interacting with multiple types of API formats, preferably REST and GraphQL, but additional skills with Websockets, SSE, RPC would be desired.
  • Work with designers and other partners to provide input on design & wireframing.
  • Working knowledge of the general mobile landscape, architectures, trends and emerging technologies.
  • Familiar with publish the application on Google Store
  • Experience with Agile development methodologies.
  • Strong interpersonal and organizational skills.
  • Good command of English.



  • Cross-Platform Development: Utilize frameworks like React, Flutter, or .NET MAUI for cross-platform development, ensuring code reusability and efficiency.
  • Bachelor’s or Master’s in Computer Science, Engineering, Physics, Math, or related work experience.
  • Experience with UI design principles.
  • Leadership skills.
  • Experience in mobile application architecture design.
Why us?

We are offering

  • professional challenges, inspiring, diverse tasks
  • structured development process
  • learning path on new technologies (AI, LLM)
  • multiculture environment
  • flexible working hours and home office days
  • relaxed atmosphere, steady, supportive international team
  • easily accessible modern office with good infrastructure
  • complimentary coffee, fruits and snacks
About us
Telio is a medium-sized, internationally active, rapidly growing company in the field of telecommunications and IT services in the prison sector. As the European market leader, we have been providing communications solutions for prisons and their inmates worldwide for 25 years. With more than 270 employees, we are active in 25 countries and develop, install and operate communication and media systems that make an important contribution to resocialization in prisons as well as in correctional facilities.
We are looking forward to hearing from you!
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