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2G / 3G Sunset and the Roaming Challenge

According to data published by the GSMA, 27 operators in 16 European countries will not offer any 2G or 3G-based voice services in their mobile networks starting in January 2026. This means operators have less than 3 years to prepare and warm up for this new era in mobile communication.

Establishing a robust VoLTE implementation in their networks is not the only challenge for mobile operators. They also have to offer VoLTE services to all their inbound roamers. Likewise, they need to guarantee VoLTE roaming services to their outbound roamers in all roaming destinations without 2G/3G service availability.

Statista predicts travel will exceed pre-COVID levels in 2023. Tourist trips are on the rise, and even business travel is taking off again. It’s safe to assume roaming traffic will follow suit, especially as users are more dependent than ever on staying connected.

Having VoLTE roaming agreements in place is the first challenge mobile operators must face. The risks of not having them ready when the 2G/3G sunset happens are evident:

• Roaming partners will select other networks in the same territory that support VoLTE.
• Customers visiting foreign destinations will not enjoy voice services anymore, and mobile operators will lose roaming revenues.
• Mobile operators will risk high churn, losing out to national competitors that offer VoLTE roaming.

Even if VoLTE roaming is in place with the roaming partners, additional challenges remain:

• How to guarantee that VoLTE roaming is continuously working, considering frequent changes in the network elements involved in a VoLTE roaming call?
• Does the quality of VoLTE calls always meet the expected levels? Network upgrades and changed signaling and user plane protocol flows could lead to poor service quality for certain subscriber profiles, roaming destinations, or call scenarios.
• As most operators have implemented S8 Home Routing, all voice user plane traffic will be passed to the home network first, which might cause voice quality problems due to huge delays.

Proactive monitoring of VoLTE roaming performance and customer experience is, therefore, a must for every network operator. As long as 2G or 3G networks are still alive, customers will not complain or suffer from bad VoLTE service when they can still fall back to the legacy networks to execute voice calls.

Without monitoring VoLTE roaming performance frequently, mobile operators might misleadingly feel that voice services are running well. In the future, when the 2G/3G sunset effectively takes place, they might be knocked out of the skies when customers are stuck without quality voice services.

Using the Global Service Enabler (GSE) platform, SEGRON will soon start the first VoLTE roaming performance campaign for selected networks. The aim is to understand the current status of VoLTE roaming quality, measuring further KPIs with a true customer experience focus and using real, unrooted smartphones.

Don’t wait until the 2G/3G sunset to understand the true performance of your VoLTE roaming quality. Get in touch, and let’s discuss how you can partner with SEGRON and use the GSE to proactively verify your VoLTE roaming performance.


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Senior SaaS System Administrator

Technical Skills :
  • Oversee the sysadmin related tasks in our SaaS infrastructure (partially cloud based, partially bare metal)
  • Daily operation and maintenance of the system
  • Analysing and resolving incidents
  • Follow and help improving the incident and change management procedures
  • Design procedures for system troubleshooting and maintenance
  • Incorporating base OS updates and security patches
  • Ensure that systems are safe and secure against cybersecurity threats by raising change requests where potential threat is possible
  • Performing SW updates for the Segron SaaS SW stack (distributed architecture with clusters)
  • Configuring solutions like reverse proxy, firewalls, etc.
  • Building tools to automate procedures & reduce occurrences of errors and improve customer experience
  • Tutoring & coaching newcomers & less senior experts in the team
  • Interworking with the architects and IT admins of Segron to have the SaaS procedures inline with the Segron processes
Non-technical skills:
  • We are looking for a self-motivated, self-improving individual with a highly independent mindset and open and straightforward technical communication to help us to improve and maintain our cloud infrastructure of our powerful end-to-end testing solution ATF (Automated Testing Framework)
  • 3+ years hands-on experience with operation and monitoring of cloud / linux systems
  • 3+ years of hands-on experience with network devops elements: configuring routers, switches, networks
  • Hands-on experience with running live systems with infrastructure as a code mode of operation
  • Specific knowledge which brings direct advantage: Docker, Docker Compose, Grafana, Prometheus, Ansible, Debian Linux OS administration, Security
  • Experience in building and maintaining distributed systems (incl. redundancy, resiliency, load-balancing) is welcome
  • Excellent knowledge of English
Location :
  • Place of work: Bratislava (partially home office possible)
  • Rate: from 30 EUR/hour (possible higher rate, depends on experience)
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CI/CD Senior Developer

Technical Skills :
  • A senior role with a proven expertise in software development, cloud computing, DevOps, and CI/CD
  • Experience in planning, designing, and overseeing the CI/CD strategy and architecture on the level of organization
  • Ability to tailor testing strategies which define and follow the best practices, standards, and policies for the software delivery process
  • Hands-on experience in creating and managing CI/CD pipelines and workflows (PaaC)
  • Ability to evaluate and recommend the best tools, technologies, and methodologies for the CI/CD implementation
  • Prior hands-on experience working with different CI/CD toolsets (Jenkins, Bitbucket, GitLab, artifactory, Ansible ..)
  • Proficient with DevOps tools API automation capabilities
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  • Comfortable working with Linux platforms
  • Initial working experience in SW development is an advantage.
Non-technical skills:
  • Effective communication with technical as well and business stakeholders
  • Self-motivating, self-improving mindset
  • Ownership of relevant industry certificates is a plus
Location :
  • Location: Bratislava, Slovakia (with hybrid flexibility)
  • Rate: from 30 EUR/hour (possible higher rate, depends on experience)
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Test Automation Engineer

Job description, responsibilities:

  • ATF system configuration, integration, operations & maintenance in customer environments.
  • Building tools to automate procedures & reduce occurrences of errors and improve customer experience.
  • Hardware Verification, Testing and Preparation within the Staging Process.
  • Contribution to customer and service partner technical support across multiple accounts by sufficiently managing priorities and deadlines for own work.
  • Segron Laboratory equipment configuration and maintenance support.
  • Hardware order and logistics support.
  • Problem analysis of ATF issues, troubleshooting and fault correction.
  • Interface towards SEGRON Development Team in case of product or software issues.
  • Interface towards the SEGRON Technical Sales Team to support planned activities.
  • System and Integration documentation and guidelines.
  • Perform root cause analysis for production errors.
  • Deployment of software updates and fixes.
  • Ability to work in a team environment serving multiple global customers.
  • Willing to travel for 3-5 days onsite deployments
Requirements/ Skills:
  • Excellent knowledge of English
  • Operating Systems: Linux, Windows, MacOS
  • Good Knowledge of Containers and Virtual Machines
  • Telco experience welcome
  • Python or other scripting experience or knowledge preferable
  • Educational Qualification: Computer Science/Engineering or work experience equivalent
  • Work Experience: 3-4 years preferred


  • Full time job (employment)
  • 3 days onsite, 2 days home office
  • Offered salary: from 1800 Euro (depends on seniority and skills level)
  • Variety of financial benefits
  • Place of work: Bratislava
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Senior Python Developer

Technical Skills :

  • A solid, experienced SW developer with at least 10 years of experience in active SW development in different programming paradigms
  • Minimum 5 years of professional Python development experience
  • Master or college degree from Computer Science, Mathematics or STEM domain
  • Well educated in design and programming patterns that increase software’s efficiency and readability.
  • Very good analytical and problem solving skills.
  • At least three skills out of the following 4 skills are requested:
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    • Linux
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  • Comfortable with sysadmin and DevOps skills (Ansible, YML files, Network Programming, IP protocols, designing and developing proxy servers for different protocols – example: streaming, integrating and compiling third party libraries on Linux (Debian))
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  • Familiar with web performance best practices

Non-technical skills:

  • Ability to work under pressure
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  • Strong communication skills with both technical and non-technical stakeholders
Location :
  • Bratislava, Slovakia (with hybrid flexibility)
  • Rate: from 35 EUR/hour (possible higher rate, but depends on experience)
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