Telio Group

Medior C# / .NET Software Engineer

Telio Group  •  Budapest, HU (Hybrid)  •  20 days ago
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Job Description

Your mission

Are you passionate about writing clean, high-quality code and building reliable software solutions? We are looking for a Medior C# Developer to join our growing development team in Budapest, working for a multinational leader in the telecommunications sector In this role, you’ll contribute to cutting-edge projects that power secure and efficient communication systems across the Globe.

Your profile

Duties and responsibilities

  • Design, implement and evolve scalable backend services using C# / .NET
  • Contribute to microservices architecture and domain-driven design initiatives
  • Own features end-to-end from technical design to production rollout
  • Participate in architecture discussions and system evolution decisions
  • Collaborate with cross-functional teams (Frontend, DevOps, QA, Product)
  • Support modernization of legacy components into distributed systems
  • Contribute to API design and internal platform capabilities
  • Participate in improving CI/CD pipelines and DevOps maturity
  • Contribute to observability, monitoring and reliability improvements
  • Ensure high standards of code quality, maintainability and security
  • Support integration with telephony, VoIP, financial and regulatory systems
  • Take part in research and experimentation with AI-based solutions where applicable

Required Qualifications, Experience & Competencies

Professional Experience & Skills

  • Core Engineering Foundation
  • 2-5 years of professional software engineering experience
  • Solid foundation in computer science fundamentals (data structures, algorithms, distributed systems, system design)
  • Ability to design scalable, maintainable and resilient systems
  • Experience working on production systems (not necessarily mission-critical at scale)
  • Good understanding of backend architecture principles
  • Experience designing and working with APIs and service-oriented systems
  • Awareness of performance, reliability, and security considerations
  • Technology Adaptability
  • Proficiency in at least one modern backend programming language (C#/.NET experience is highly valued, but strong engineers from other ecosystems are welcome)
  • Experience working in distributed or microservices-based systems
  • Solid database design knowledge (relational and/or NoSQL)
  • Experience working with cloud environments (Azure preferred, but not mandatory)
  • Comfort navigating hybrid (cloud + on-prem) environments
  • Learning agility and architectural thinking over specific library knowledge
  • AI & Modern Engineering Mindset
  • Interest in applying AI-assisted development practices
  • Openness to integrating AI-driven features into products
  • Curiosity toward automation, intelligent workflows and experimentation
  • Experience using modern AI development tools (Copilot, LLM-based workflows, etc.) is an advantage
  • Growth mindset toward emerging technologies
  • Active contribution to AI-enabled engineering workflows and intelligent product capabilities
  • DevOps & Engineering Culture
  • Understanding of CI/CD principles
  • Ownership mentality and accountability for production systems
  • Experience working in collaborative, cross-functional teams
  • Desire to contribute to high-performance engineering culture
  • English proficiency (written and spoken)


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, fruit and snacks
Telio Group

About Telio Group

*A deeper insight into Telio*

“Improving life in correctional facilities through innovation and understanding” - This is the ethos that makes us a global leader in providing digital communication and administration services for the smart prisons of tomorrow. We are committed dedicated to fostering an environment for positive mental health and successful rehabilitation.

Committed from the start

Telio was founded in 1998, and has more than two decades of dedicated experience in the global correctional facility environment. What started out as providing detainees with telecommunication via highly secured hallway phonebooths has since grown into a global company with over 250 employees providing institutions with cutting-edge digital solutions for safe, human, and future proof operation..

Ready for the digital transformation 

Digitalisation is playing a major role in the operation of correctional facilities. As the leading provider of telco solutions in EMEA, our vision is to become the go-to name for digital innovation. We help to improve lives and promote rehabilitation, create smarter prisons, easing workloads, and enabling healthy communication.

A global presence with local understanding 

Telio is operating in 23 countries, in over 800 international facilities, and our solutions are used by more than 400,000 inmates. Our comprehensive, long-term industry knowledge gives us valuable insights to the benefit of our customers as is shown by our taylormadetailormade solutions, successful implementations and continuous collaboration.

Industry
Unknown
Company Size
51-200 employees
Headquarters
Hamburg, DE
Year Founded
1998
Website
tel.io
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