Principal Software Engineer - VoIP Domain
First seen by Alion on Oct 23, 2026.
About us:
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, 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 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.
- Experience with Java, JavaScript languages.
Skills
VoIP, SIP, Asterisk, Golang, Linux, AWS, IP Networking, Routing Protocols, Ruby on Rails, Python, VLAN