Senior Systems Engineer (Linux & VoIP/Asterisk Development)

We are seeking an experienced Systems Engineer with deep Linux Development and security expertise to design, build, and secure our next-generation communication infrastructure.

In this role, you will be responsible for architecting enterprise-grade systems, including an Asterisk phone system that leverages AGI (Asterisk Gateway Interface) scripting for dynamic call control and the Asterisk RealTime Architecture (ARA) for scalable, database-driven configuration.

A critical component of this role is security.

The successful candidate must have a proven track record of hardening Linux and Asterisk environments against sophisticated external intrusions, toll fraud, and DDoS attacks.

**Architecture & Development:** Design and deploy a highly scalable, resilient, Asterisk-based PBX/VoIP platform from scratch on Linux environments (Ubuntu, Debian, or CentOS). **Dynamic Call Control (AGI):** Develop, maintain, and optimize custom AGI scripts (using Python, PHP, Perl, or Bash) to handle complex routing, IVR logic, and third-party API/CRM integrations.

**Database Integration (RealTime):** Architect and maintain Asterisk RealTime Architecture (ARA) backends using MySQL to dynamically manage SIP peers, extensions, voicemails, and dial plans.

**Platform Hardening & Security:** Implement strict security frameworks to protect the platform from external intrusion.

Deploy and configure tools such as Fail2ban, custom iptables firewalls, and SIP TLS/SRTP encryption.

**System Optimization:** Monitor, troubleshoot, and tune Asterisk and the underlying Linux kernel for low latency, jitter management, high concurrency, and optimal audio quality. **Maintenance & Operations:** Manage SIP trunking, dial plans, and WebRTC integrations, while handling carrier-level troubleshooting using packet capture tools such as Wireshark and sngrep.

**Systems Engineering:** 4+ years of hands-on experience with Asterisk architecture, advanced dial plan configuration, AGI scripting, and Asterisk RealTime (ARA).

Linux Development: Strong proficiency in Linux system administration, shell scripting, and core software development (Python, PHP, or C/C++ preferred).

**Network Protocols:** Deep understanding of SIP, RTP, RTCP, WebRTC, and codec negotiation (G.711, G.729, Opus).

**Database Management:** Strong knowledge of SQL database design, optimization, and clustering for high-availability Asterisk RealTime environments.

Proven experience defending VoIP networks against SIP scanning, registration brute-forcing, SQL injection via AGI, and Distributed Denial-of-Service (DDoS) attacks.

Experience implementing TLS for SIP signaling and SRTP for media encryption.

Familiarity with network security tools like Fail2ban, iptables, and Snort/Suricata.

Experience with SIP Proxies or Load Balancers like Kamailio or OpenSIPS.

Knowledge of containerization (Docker, Kubernetes) for VoIP microservices.

Familiarity with compliance frameworks regarding call recording and data protection.

**Problem-Solving:** Exceptional analytical and debugging skills, including reading core dumps and analyzing sngrep logs.

**Security-First Mindset:** Intolerant of security loopholes, builds infrastructure under the assumption that threat vectors are constantly active.

**Collaboration:** Ability to work closely with web development teams to bridge VoIP systems with internal software dashboards.

Pay: AED12,000.00 - AED15,000.00 per month