VoIP Platform Infrastructure Engineer Base

Product Knowledge (Installation Configuration Operations Maintenance)
- Asterisk (deep): Strong operational and development-level understanding of Asterisk internals especially large and complex dialplans with business logic.
- Dialplan engineering: Ability to design refactor and troubleshoot multi-branch call flows failover paths and edge-case routing behavior.
- Call encryption: Practical handling of TLS and SRTP in production including certificate lifecycle and interop troubleshooting.
- SBC stack: Solid Kamailio skills for SIP routing/policy and RTPengine operation for media anchoring NAT traversal and media security.

SIP Capture and Troubleshooting
- PCAP and Wireshark: Confident packet-level troubleshooting for SIP RTP SRTP TLS handshake issues retransmissions and one-way audio.
- Homer SIP capture: Efficient use of capture/visualization to correlate signaling and media events across distributed components.
- End-to-end call tracing: Ability to correlate identifiers (Call-ID tags branch params dialogs) across Asterisk Kamailio and SBC layers.
(- Test strategy depth: SIP integration tests regression suites for dialplan logic and synthetic call monitoring in production-like environments.)

Operating System and Automation
- SUSE Linux (LPIC-1 level or higher): Comfortable with package/service management networking process control and system diagnostics.
- Python (basic): Scripting for automation validation and lightweight operational tooling.
- Cron and shell scripting: Building and maintaining jobs for log rotation housekeeping health checks and routine maintenance tasks.
- Log and filesystem hygiene: Managing retention rotation policies and storage pressure under high call volume.

Network and VoIP Foundations
- TCP/UDP deep understanding: Behavior under packet loss reordering retransmissions and impact on signaling/media quality.
- VoIP protocols (deep): SIP RTP SRTP TLS mTLS codec negotiation DTMF transport NAT and firewall implications.
- SIP protocol internals (RFC-level): Transaction/dialog state machines timers forking early media PRACK/100rel session timers.
- Network services (deep): DNS behavior (including latency/caching/failover effects) NTP sync relevance for logs/traces and routing basics.
- High availability and disaster recovery: Active-active/active-passive design failover testing backup/restore drills RTO/RPO ownership.

AWS and Infrastructure as Code
- Core AWS: EC2 VPC Route 53 Security Groups CloudWatch and basic Lambda usage.
- Resilience testing: AWS FIS basics for controlled fault injection and validation of failover behavior.
- Secrets and access management: IAM least privilege secret rotation certificate/key lifecycle and auditability.
- Terraform: Versioned repeatable infrastructure provisioning and safe change workflows (plan/review/apply discipline).

DevOps and Reliability (Mandatory for Dev DevOps Collaboration)
- CI/CD pipelines: Build test security checks and controlled release promotion.
- Observability operations: Metrics logs traces and alert tuning to reduce noise and improve incident response.
- Incident response: Structured triage rollback decision-making and post-incident analysis.
- Release and change governance: Blue-green/canary strategy maintenance window practices and backward-compatible migration planning.

Required Experience:

Manager