VoIP Platform / Infrastructure Engineer ...

BMW TechWorks India Private Limited; Pune District; On-site; INR 1,800,000 - 3,200,000; Full time

Job summary

BMW TechWorks India Private Limited in Pune is seeking a VoIP Platform/Infrastructure Engineer to design, implement, and operate complex SIP/VoIP environments. You will work on Asterisk, Kamailio, SBC, and security, plus automation in SUSE Linux and AWS, ensuring high availability and reliability in production.

The role requires strong technical depth in SIP/RTP/SRTP/TLS/mTLS, dialplan engineering, and incident response, with 9–15 years of relevant experience and a collaborative DevOps mindset.

Qualifications

• 9–15 years of experience in VoIP platform engineering and infrastructure.
• Strong hands-on with Asterisk, Kamailio, SBCs, TLS/SRTP, and secure media paths.
• Experience with SIP signaling, media routing, and dialplan optimization in large deployments.

Responsibilities

• Design, implement and operate production VoIP infrastructure and related services.
• Perform SIP capture, troubleshooting, and end-to-end tracing across Asterisk, Kamailio, and SBC layers.
• Develop automation for health checks, log analysis, and incident response in a DevOps context.
• Collaborate with DevOps for CI/CD of VoIP services and infrastructure as code.

Skills

Asterisk (deep)

Dialplan engineering

Call encryption TLS/SRTP

Kamailio SBC

SBC stack media anchoring

PCAP and Wireshark

Homer SIP capture

End-to-end call tracing

Python scripting

SUSE Linux LPIC-1

Cron and shell scripting

DNS/NTP networking

SIP/RTP/SRTP/TLS/mTLS

AWS and IaC

CI/CD and Observability

Tools

Kamailio

Wireshark

SIP/VoIP tooling

Job description

VoIP Platform / Infrastructure Engineer ...

BTWI/VP-IE-B/1840180

• Digital Car
• Pune

Skills

Skill

Job Description

Required Experience 9 - 15 years

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.