Principal Engineer (Voice & Messaging)

Location: Bengaluru,,

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.

Stakeholder management

Mentor junior engineers in the team.

What do we look for?

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

Experience with Java, JavaScript languages

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