RADIUS Systems & DevOps Specialist - Hybrid - Stellenbosch at Datafin Recruitment

ENVIRONMENT:

• Our client provides a pay-as-you-go, uncapped fibre internet solution built specifically for township markets. Customers can access high speed (up to 100 Mbps) fibre from home with no contracts or installation fees, at affordable rates.
• The mission is simple: make reliable, high-quality internet accessible to everyone. They are seeking a RADIUS Systems & DevOps Specialist to join the Engineering – Platforms team.
• This role is responsible for the stability, scalability, and security of subscriber authentication and policy enforcement across network platforms.
• You will own the reliability, performance, and automation of RADIUS and AAA systems, working closely with databases, OSS/BSS platforms, and core network services.
• The role plays a critical part in ensuring subscriber platforms scale effectively, remain resilient under heavy load, and recover gracefully from failures — supporting a fast-growing user base and a mission-critical service.

DUTIES:

RADIUS & AAA Platform Management

• Maintain and operate RADIUS proxies and AAA systems in high-scale ISP environments.
• Ensure high availability, performance, and security of authentication platforms.
• Support subscriber authentication, authorization, and policy enforcement services.

Systems Integration & Data Management

• Integrate RADIUS platforms with databases and OSS/BSS systems.
• Support data flows between authentication systems, network elements, and customer platforms.
• Assist with troubleshooting complex subscriber and policy-related issues.

Scalability, Resilience & Reliability

• Perform scaling, load, and failure-mode analysis on RADIUS and AAA platforms.
• Design and implement resilience strategies, redundancy, and failover mechanisms.
• Participate in incident response, root cause analysis, and long-term remediation.

Automation & DevOps

• Automate deployments, configuration management, and operational tasks.
• Improve platform consistency, repeatability, and recovery through automation.
• Support CI/CD practices for platform configuration and updates.

REQUIREMENTS:

Experience:

• Hands-on experience operating RADIUS and AAA systems in ISP environments.
• Strong experience with Linux systems and databases.
• Experience integrating authentication platforms with OSS/BSS systems.
• Exposure to AWS and/or on-prem infrastructure environments (advantageous).

Technical Competencies:

• Strong understanding of subscriber authentication and policy enforcement.
• Experience with scalable, high-availability system design.
• Solid troubleshooting and performance optimisation skills.
• Automation mindset with a focus on reliability and repeatability.