Principal Engineer (Voice & Messaging)

Exotel Techcom Pvt Ltd; Bengaluru; On-site; INR 900,000 - 1,200,000; Full time

Job summary

Exotel Techcom Pvt Ltd in Bengaluru seeks a senior VoIP engineering leader to influence the product roadmap, mentor teams, and drive architectural decisions for a scalable, high-availability communications platform powering global customers.

You will work with Asterisk, Kamailio/OpenSIPS, REST microservices, cloud platforms (AWS/GCP/Azure), Linux, and DevOps tooling; guide projects, enforce SLAs, and champion reliability while collaborating with cross-functional teams in a fast-paced environment.

Qualifications

• 8+ years in the VoIP domain.
• Bachelor's or Master's in computer science or equivalent.
• Solid knowledge of VoIP technologies (SIP, SDP, RTP, RTCP).
• Experience leading project teams for critical software solutions.
• 6+ years building high-availability, scalable VoIP systems.

Responsibilities

• Influence the product roadmap as a technical leader.
• Exploration and adoption of new technologies to improve reliability and efficiency.
• Provide technical guidance and mentoring on architecture and design.
• Help enforce and/or tweak SLAs for deployments to improve efficiency.
• Build and guide the team for operational excellence.
• Stakeholder management and leadership of junior engineers.

Skills

VoIP domain knowledge

Leadership & mentoring

Analytical & problem solving

Communication skills

Agile SDLC

Team player in fast-paced env

Education

Bachelor's or Master's in Computer Science or equivalent

Tools

Asterisk

Kamailio/OpenSIPS

Golang / Ruby / C/C++

Linux

AWS / GCP / Azure

Job description

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—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.

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