Principal Software Engineer (VOIP / Telephony)

Exotel; Bengaluru; On-site; INR 1,200,000 - 2,500,000; Full time

Job summary

Exotel is seeking a senior VoIP/Cloud Platform Engineer to influence product roadmaps and guide architecture for scalable, high-availability systems. You will mentor teams, set standards for reliability, and drive operational excellence across deployments.

You will work closely with cross-functional teams in a fast-paced environment, applying your deep VoIP expertise, cloud experience (AWS/GCP/Azure), and strong scripting abilities to deliver robust, scalable microservices.

Qualifications

• 8+ years of VoIP domain experience required.

Responsibilities

• Influence the product roadmap as a technical leader.
• Exploration and adoption of new technologies to improve system reliability and efficiency.
• Provide technical guidance and mentoring to project teams on architecture and design.
• Help enforce or tweak SLAs for deployments to improve efficiency.
• Build and improve processes to boost efficiency.
• Build and guide the team for operational excellence.
• Mentor junior engineers in the team.

Skills

VoIP domain expertise

Project team leadership

REST-based microservices

Linux proficiency

Agile SDLC

Analytical problem-solving

Communication skills

DevOps mindset

Scripting: Python

Shell scripting

Education

Bachelor's or Master's degree in computer science or equivalent

Tools

Asterisk

Kamailio

Opensips

AWS

GCP

Azure

Kubernetes

Terraform

Jenkins

Ansible

Grafana

Nagios

PostgreSQL

MySQL

Git

Job description

Exotel is the emerging market’s leading full-stack customer engagement platform and business-focused virtual telecom operator. Founded in 2011, our cloud-based product suite powers over 50 million daily engagements across voice, video, and messaging channels.

Trusted by 6,000+ companies across 60+ countries—including India, Southeast Asia, the Middle East, and Africa—Exotel enables unified customer engagement for leading businesses such as Ola, Swiggy, Flipkart, GoJek, Byju’s, HDFC Bank, Zomato, and Urban Company. Our offerings include communication APIs, a modern omnichannel contact centre, and a conversational AI platform hosted on the cloud. We are a Series D company valued at $100 million with $60 million in ARR.

What will you do?

• Influence the product roadmap as a technical leader
• Exploration and adoption of new technologies to improve system reliability and efficiency.
• Technical guidance and mentoring to the Project teams on architecture and design.
• Help enforce and/or tweak SLAs for existing deployments to improve efficiency.
• Build and improve, and enforce processes to improve efficiency.
• Build and guide the team for operational excellence.
• Mentor junior engineers in the team.

What do we look for?

Must Haves

• 8+ years of experience in the VoIP domain.
• Bachelor's or Master's degree in computer science or equivalent.
• Solid knowledge of VoIP domain technologies, including SIP, SDP, RTP, RTCP.
• Solid knowledge of IP networking concepts, including L2/L3 routing, Subnets, VLANs,and NAT traversal.
• Solid knowledge of network impairments and their impact on call quality.
• Experience leading project teams to deliver critical software solutions.
• 6+ years of experience in building high-availability, scalable and fault-tolerant VoIP systems.
• 4+ years of experience in working with server-side VoIP applications like Asterisk, Kamailio or equivalent
• 3+ years of experience in working with a major cloud platform like AWS (preferred), GCP, or Azure.
• 2+ years of experience in the design and development of REST-based microservices.
• Experience in programming with one of Golang (preferred), Ruby, C/C++
• Experience in scripting with shell and Python
• Experience with data stores such as MySQL, Postgres
• Good understanding of data structures, multi-threading and concurrency concepts.
• Proficiency in working in a Linux environment
• Experience working in Agile SDLC process
• Strong analytical, problem-solving and troubleshooting skills
• Excellent written and verbal communication skills
• Team player, flexible and able to work in a fast-paced environment
• A "DevOps" mindset. You own what you will develop.

Good to Have

• Experience with custom development on Asterisk/Freeswitch/Kamailio/Opensips is a plus
• Experience with SIPp or any other SIP testing tools
• Experience with ISDN, WebRTC technologies
• Experience with Elastic Search queries and visualisation tools like Grafana, Kibana
• Experience with DevOps tools like Ansible, Jenkins, Terraform, Kubernetes, Git
• Experience with monitoring frameworks like Nagios, Prometheus
• Experience with developing Android, iOS-based VoIP clients