T-Mobile
Lead Application Developer - Back-End (m/f/d)
Skills
3 days ago
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Important information
Location:
Košice, Czechia
Work mode:
Onsite
Published on:
16 October 2026
What they need
Job ID: 744000129105534
Lead Application Developer - Back-End (m/f/d)
Košice
Professional
Regular
Deutsche Telekom IT and Telecommunications Slovakia
Your Task
The Lead Application Developer handles all phases of software development lifecycle, provides professional support in the field of deep system analysis, technical documentation, and building related infrastructure for developed applications by prototyping and research. This role performs as lead development architect, substitutes the role of project manager in case of small or midsize software projects, and serves as professional mentor. The position holder discusses and aids the Product owners or Product managers to make sure that the development team and technologies being selected are aligned with the business' goals and vision of the company and product. The Lead Application Developer is responsible for technical project management within planning phases.
Responsibilities
- Develop new and maintain existing source code of applications
- Work in SCRUM team on developing and building complex application solutions for customer DTAG
- Serve as professional mentor for junior, medior, senior developers
- Listen to user requests, consult with internal/external customers, project managers
- Analyze customer's requirements and propose overall application/framework design of midsize application architecture, provide complex business analysis in order to build application functionality
- Provide project estimates, timeline and bug fixing and report it to customer for budget planning in advance
- Implement customer's requirements based on specification in selected object-oriented programming language into functional and user-friendly application
- Provide testing of programmed functionality before deployment to avoid bugs and ensure quality of code
- Implement security concept according to PSA policy in developed application to ensure accordance with DTAG standards
- Provide mentoring to team members
- Take part in internal evaluation processes
- Hold product responsibility from technology point of view
- Negotiate with PO/PM about technology stacks used in project
Your Profile
We are seeking a Lead Application Developer with extensive experience in software development, strong technical expertise in modern programming languages and frameworks, proven leadership and mentoring abilities, and excellent communication skills to lead complex application development projects.
Must Have Skills
- Master's Degree in Information Technologies
- Minimum 7 years of experience in ICT Systems Engineering
- Experience in Senior Application development position
- Certificate in relevant technology stack (e.g., Java OCP, .Net MCSA)
- Expert level programming skills
- Overview of hardware/software and general IT skills
- Advanced soft skills including communication
- Advanced soft skills including team cooperation
- Advanced soft skills including mentoring
- Advanced soft skills including product management
- English language proficiency at B2 level or higher
- Experience with at least one of the preferred technology stacks: Java with Spring Boot, Angular/React/VueJS, or C#
Nice to Have Skills
- Experience with testing tools or frameworks
- Experience with Kubernetes
- Experience with Docker
- Experience with Microservices architecture
- Experience with Git
- Experience with cloud technologies (AWS, Azure, Google Cloud)
- Database experience
About Us
Our brand Deutsche Telekom IT Solutions Slovakia entered the life of Košice region in 2006 under the name of T-Systems Slovakia and ever since has been inextricably linked with the region when became one of the founding members of Košice IT Valley. We have managed to grow from scratch to the second largest employer in the eastern part of the country with more than 3900 employees. Our goal is to proactively find new ways to improve and continuously transform into the type of company providing innovative information and communication technology services.
Benefits
We believe in balance between work and personal life. An attractive and extensive work-life balance portfolio guarantees lasting motivation for employees and thus a better quality of life, promotes physical and mental well-being and contributes to a positive work environment.
We offer over 25 different benefits to improve personal and professional life in these areas:
- Financial benefits
- Benefits with focus on learning and development
- Benefits with focus on health and sport
- Benefits with focus on family and work-life balance
- Other benefits
For more information about our benefits: Benefits
Salary:
- Base salary will not be lower than €4,100 gross
- Final salary is negotiable
- Base salary depends on seniority level and previous experience of candidate
- Variable part and other financial benefits provided in addition to base salary
Company Policies
- Remote working possibility is only available within Slovakia due to European taxation regulation
Job Benefits
Family & Personal
Benefits with focus on family and work-life balance
Work-Life Balance
- Attractive and extensive work-life balance portfolio
- Remote working possibility (within Slovakia)
Professional Development
- Benefits with focus on learning and development
- Environment that encourages learning and professional growth
- Mentoring opportunities
Lifestyle & Wellness
- Benefits with focus on health and sport
- Over 25 different benefits to improve personal and professional life
Financial
- Base salary will not be lower than 4100 € /gross
- Variable part in addition to base salary
- Other financial benefits
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