Linux System Administrator

phonon, automating outcomes; Vadodara; On-site; INR 1,200,000 - 2,600,000; Full time

Job summary

Phonon, automating outcomes in Vadodara, India, is seeking a hands-on Linux Systems Administrator / Technical Operations Engineer to own security, reliability, scalability and cost efficiency of our infrastructure. The role spans CloudOps, TechOps, DevOps, SecOps and FinOps across an AWS-based cloud environment, Linux networking and SIP/VoIP platforms.

You will drive DevOps, IaC, CI/CD, monitoring and incident management; manage Asterisk, OpenSIPS, FreePBX, SIP trunks and hosted PBX; lead

Qualifications

• 3–5 years in cloud infrastructure, Linux, networking.
• Strong hands-on AWS production experience.
• Experience leading incidents and complex production issues.
• Telecom/SIP/VoIP experience preferred.

Responsibilities

• Own and operate highly available, secure and scalable AWS infrastructure.
• Manage Linux, networking, VPNs, firewalls, load balancers and telephony infrastructure.
• Own Asterisk, FreePBX, OpenSIPS, SIP/RTP, SIP trunks, IVRs, diallers and hosted PBX environments.
• Drive DevOps, CI/CD, Infrastructure as Code, containerisation and operational automation.
• Own infrastructure security, vulnerability management, patching, IAM, hardening, backup/DR and ISO 27001 readiness.
• Establish monitoring, alerting, incident management and RCA practices.
• Drive FinOps, including AWS utilisation, rightsizing and cloud cost optimisation.
• Lead complex production incidents and cloud/infrastructure support escalations.
• Lead and mentor the Cloud/Technical Operations team.
• Telephony: Asterisk, FreePBX, OpenSIPS, SIP, RTP, SIP Trunking, IVR, Diallers, Hosted PBX
• Security: IAM/RBAC, encryption, secrets management, vulnerability management, infrastructure hardening, ISO 27001

Skills

AWS

Linux

Networking

DevOps

CI/CD

IaC

Automation

Security

FinOps

Monitoring

Incident mgmt

Education

RHCE

CCNA

AWS Certification

Tools

Asterisk

FreePBX

OpenSIPS

SIP/VoIP

Terraform

Job description

Linux Systems Administrator / Technical Operations Engineer

Experience: 3–5 years

About the Role

Phonon is looking for a hands-on Technical Operations Engineer to own one or more of the aspects related to our systems including: security, reliability, scalability and cost efficiency of our technology infrastructure.

The role covers CloudOps, TechOps, DevOps, SecOps and FinOps, spanning our predominantly AWS-based cloud environment, Linux/network infrastructure and SIP/VoIP telephony platforms. The role will also lead resolution of complex cloud and production support issues.

Key Responsibilities

• Own and operate highly available, secure and scalable AWS infrastructure.
• Manage Linux, networking, VPNs, firewalls, load balancers and telephony infrastructure.
• Own Asterisk, FreePBX, OpenSIPS, SIP/RTP, SIP trunks, IVRs, diallers and hosted PBX environments.
• Drive DevOps, CI/CD, Infrastructure as Code, containerisation and operational automation.
• Own infrastructure security, vulnerability management, patching, IAM, hardening, backup/DR and ISO 27001 readiness.
• Establish monitoring, alerting, incident management and RCA practices.
• Drive FinOps, including AWS utilisation, rightsizing and cloud cost optimisation.
• Lead complex production incidents and cloud/infrastructure support escalations.
• Lead and mentor the Cloud/Technical Operations team.
• Telephony: Asterisk, FreePBX, OpenSIPS, SIP, RTP, SIP Trunking, IVR, Diallers, Hosted PBX
• Security: IAM/RBAC, encryption, secrets management, vulnerability management, infrastructure hardening, ISO 27001

Candidate Profile

• 3-5 years across cloud infrastructure, Linux, networking, DevOps and technical operations.
• Strong hands-on experience managing AWS production environments.
• Strong Linux and networking fundamentals with experience operating high-availability systems.
• Telecom/SIP/VoIP experience is strongly preferred.
• Experience leading technical teams and handling critical production incidents.

Preferred Certifications: RHCE and CCNA; AWS certification is an advantage.

We are looking for a hands-on technology operations owner who can troubleshoot critical infrastructure issues while building a secure, reliable, scalable and cost-efficient operations function.