MetroLeads – Network & VoIP Engineer (Open-Source SIP Stack)

Role Description

MetroGuild is seeking a Network Engineer with VoIP exposure who is excited to work on modern, open-source telephony technologies. You will play a central role in helping us manage and evolve our SIP-based infrastructure using platforms like FreeSWITCH, Kamailio, and related systems — with mentoring and guidance provided as needed.

This is a hybrid network + telephony + cloud infrastructure role. Prior deep experience in FreeSWITCH or Kamailio is not expected — what we need is strong networking fundamentals, solid Linux experience, familiarity with cloud platforms, and a proactive, learning mindset.

You’ll be joining a distributed team that builds and supports voice solutions for our customers across the US, EU, and India. Our stack includes Python, ElasticSearch, ReactJS, React Native, Cassandra, AWS, and modern open-source VoIP components.

What You’ll Work On

Our platform enables:

• Inbound & outbound SIP/WebRTC calling
• Campaign management (SMS, email, voice)
• Multi-channel lead capturing
• Automated lead nurturing workflows
• Team and agent dashboards
• Role-based controls and secure communication

Responsibilities

1. Configure and maintain SIP-based VoIP infrastructure using FreeSWITCH, Kamailio, and RTP relays
2. Monitor and troubleshoot SIP signaling, RTP flows, NAT traversal, and WebRTC performance
3. Work closely with React Native and backend developers integrating SIP.js and WebRTC flows
4. Integrate and maintain SIP trunks (Twilio, VoIP.ms, Airtel, BSNL, etc.)
5. Manage internal office LAN/WAN, DHCP/DNS, and network security across teams
6. Administer AWS resources: Route 53 (DNS), S3 (object storage), EC2 instances
7. Ensure high uptime, secure networking, and proper infrastructure documentation
8. Extend call routing logic and debug live systems under production load.

Minimum Qualifications

1. 3–5 years of experience in Networking, DevOps, or Infrastructure Engineering
2. Strong understanding of networking protocols: TCP/IP, NAT, DNS, SIP, RTP
3. Hands-on experience managing AWS services, especially Route 53, S3, and EC2
4. Prior experience managing or configuring internal corporate networks and routers
5. Linux system administration and troubleshooting proficiency
6. Familiar with one scripting/backend language (Python, Java, or Node.js)
7. Basic exposure to VoIP/SIP concepts and desire to grow into the domain
8. Good communication and collaboration skills
9. Bachelor’s degree in computer science, IT, or a related field

Nice to Have (Optional but Valued)

1. Exposure to FreeSWITCH, Kamailio, or OpenSIPS
2. Familiarity with WebRTC, SIP.js, and SIP over WebSocket
3. Experience working with trunk providers (Twilio, Airtel, BSNL, TATA)
4. Experience with CI/CD, monitoring tools, and Docker-based deployment

Work Location

This is an on-site role (Pune) as the telephony infrastructure and internal networking are managed locally. Occasional client site visits may be required based on project needs.