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Telio Group Tech Stack

Correctional facility software and secure communications platform

Information Technology & Services Hamburg 201–500 employees Founded 1998 Privately Held

Telio operates purpose-built software and telecom infrastructure for prisons and justice ministries across 23 countries. The tech stack reveals a heavily Windows-integrated platform (.NET Core, SQL Server, WCF) paired with modern mobile layers (Kotlin, Flutter, React Native), now adopting SIEM and shifting away from Confluence—a pattern consistent with strengthening security posture and centralizing operational tooling. The hiring velocity (12 roles in 30 days, engineering-weighted at 13 roles) reflects a company modernizing legacy systems while scaling security and compliance operations in a mission-critical environment.

Tech Stack 50 technologies

Core StackC# SQL Server Kotlin Java Cisco Fortinet Ansible Terraform Jira Confluence .NET React Native Flutter NET Core Entity Framework Core ASP.NET MVC ASP.NET Web API Windows Communication Foundation Git SIP Android Material Design Unity Microsoft Office Outlook PowerPoint Extreme Networks Fortinet FortiGate iOS NET MAUI+18 more

AdoptingSIEM

ReplacingConfluence

What Telio Group Is Building

◆Challenges

Meeting revenue targets
Inventory management
Manual network configuration
Outdated network hardware
Security-critical product in justice environment
Incident readiness
Modernizing legacy components
Integrating legacy telephony systems
Improving ci/cd pipelines
Optimizing network performance

▲Active Projects

Network audit compliance
Disaster recovery planning
Api development
Installing unity phone systems in prisons
O&m activities for prison installations
Automating networking tasks
Threat modeling for products
Automating security controls
Implementing siem
Modernizing legacy components into distributed systems

Hiring Activity

Accelerating20 roles · 10 in 30d

Department

Engineering

13

Support

3

Executive

1

Sales

1

Security

1

Seniority

Senior

7

Lead

4

Mid

4

Junior

3

Intern

1

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About Telio Group

Telio provides digital communication and administration software for correctional facilities and justice institutions. Founded in 1998, the company operates across over 800 facilities in 23 countries, serving more than 400,000 inmates. The platform spans telephony (legacy secured phone booths evolved into modern SIP-based systems), inmate self-service portals, and institutional dashboards. Active projects center on network compliance, disaster recovery, API modernization, and Unity phone system deployment—indicating a shift from monolithic to distributed architectures. The 201–500 employee base is headquartered in Hamburg and distributed across hiring regions in Central and Western Europe.

HeadquartersHamburg

Company Size201–500 employees

Founded1998

Hiring MarketsHungary, Croatia, Germany, Netherlands, France

Frequently Asked Questions

What technology does Telio use to build its prison software?

Telio's core platform runs on .NET Core, SQL Server, and ASP.NET, with mobile clients in Kotlin, Flutter, and React Native. Network infrastructure uses Cisco, Extreme Networks, and Fortinet FortiGate. Security controls are managed via Ansible and Terraform, with recent adoption of SIEM tooling.

What is Telio working on?

Active projects include network audit compliance, disaster recovery planning, API development, Unity phone system deployment in facilities, modernizing legacy components into distributed systems, and implementing SIEM for threat detection and security automation.