Cloud Engineer (Telephony)

Rezo.AI; Dadri; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Rezo.AI seeks a hands-on Telephony and Linux specialist to own and manage our telephony platform and Linux systems. The role starts with telephony and Linux fundamentals, with mentorship and ownership to build the rest here.

You will build and maintain Asterisk and FreeSWITCH, author dial plans, and troubleshoot SIP/RTP. The path includes cloud and DevOps, automation in Bash/Python, and CI/CD as you gain experience.

Qualifications

• 2 to 3 years hands-on with Asterisk and/or FreeSWITCH in production.
• Real dial plan authoring and debugging, not just editing someone else’s - Experience with SIP trunk providers and PSTN connectivity.
• Systematic troubleshooting on an unfamiliar box under load.
• Networking knowledge: TCP/UDP behaviour, routing, DNS, NAT, firewalls, and how to prove where a packet is dropped.
• Willingness to grow into Cloud & DevOps responsibilities.

Responsibilities

• Build and maintain Asterisk and FreeSWITCH installations, upgrades, configuration, hardening.
• Own the servers: provisioning, patching, backups, recovery; manage the networking stack: routing, DNS, NTP, firewalls, packet path of a call.
• Develop automation in Bash or Python and learn CI/CD as you grow.

Skills

Asterisk

FreeSWITCH

SIP

Dial plan authoring

Linux system administration

Networking

Troubleshooting

Automation scripting (Bash/Python)

Tools

Kamailio/OpenSIPS

SBC exposure

AMI/ARI

ESL WebRTC

TLS/SRTP kernel tuning

CI/CD basics

Cloud familiarity

Job description

About the role You will own and manage our telephony platform and the Linux systems. The cloud and DevOps piece is deliberate our platform runs on cloud infrastructure, and we want the person maintaining it to eventually deploy and automate it themselves. One doesnt need Cloud & DevOps experience coming in. We hire on telephony and Linux fundamentals; you'll have the mentorship, the time, and the real ownership to build the rest here.

Role & responsibilities

Telephony

• Build and maintain Asterisk and FreeSWITCH installation, upgrades, configuration, hardening
• Write and debug dial plans: routing, IVR, queues, time conditions, failover
• Root cause from SIP traces and RTP streams

Linux (equally core)

• Own the servers: provisioning, patching, hardening, capacity, backups, recovery
• Manage the networking stack: routing, DNS, NTP, firewalls, and the packet path a call actually takes

Cloud & DevOps (where the role grows )

• Cloud fundamentals, then automation in Bash or Python, then monitoring, containers, and CI/CD as you get comfortable

Requirements

Preferred candidate profile

Telephony

• 2 to 3 years hands-on with Asterisk and/or FreeSWITCH in production
• Real dial plan authoring and debugging, not just editing someone else's - Experience with SIP trunk providers and PSTN connectivity

Linux (good to expert level)

• Systematic troubleshooting on an unfamiliar box under load
• Networking knowledge: TCP/UDP behaviour, routing, DNS, NAT, firewalls, and how to prove where a packet is dropped

Troubleshooting (What matters more than the checklist)

• You want to know why it broke and get to the root cause of the issue to fix it. You reach for the layer below when the obvious answer doesn't hold.

Good to have

• Kamailio/OpenSIPS or SBC exposure
• AMI/ARI or ESL WebRTC, TLS/SRTP kernel tuning any cloud platform, Python, or monitoring tool