SE-3 (Tel & IP)

Job Description

About us Exotel is one of Asia's largest customer communication platforms We are on a mission to move enterprise customer communication to the cloud In 2020, we powered over 4 billion calls and connected over 320 million people We work with some of the most innovative companies such as Ola, Swiggy, Zerodha, Whitehat Jr, Practo, Flipkart, GoJek, etc We also power customer communication for some of the top banks in the country Join us on this journey to make a difference in how companies look at customer communication Read our growth story here, Tech @ Exotel Exotel engineering solves some really cool infrastructure level problems with the goal of ensuring no one misses a call or an SMS, Our focus is on building a very fault-tolerant, loosely coupled, scalable and real-time distributed system We are generally agnostic of language, technology or tools Currently, our tech stack is built on Golang, NodeDot js, Ruby, Java and PHP We use Aerospike, MySQL as data stores, ElasticSearch for search and Beanstalkd for queuing We emphasize a lot on clean abstractions of code, loosely coupled services and good coding practices We are very strong believers in "you built it, you own it!" And running a distributed system is very different from just building one! We are crazy about the high availability What you will do Lead projects related to Exotel's telephony and VoIP stack Responsible for driving projects throughout its lifecycle, Work with a team of engineers to explore, design, develop, test, deploy, and operationalize a product's features & improvements, Build fault-tolerant, scalable and real-time distributed voip system Effectively work in a collaborative and agile team environment Support team with timely analysis and debugging of operational issues, Be on rotational on-call roster to handle operational issues Emphasis on automation and scripting, Mentor junior engineers in the team, What we look for Must Haves Bachelors or Masters degree in Computer Science or Communications Engineering Solid knowledge on VoIP domain technologies including SIP, SDP, RTP, RTCP, Solid knowledge on IP networking concepts and L2/L3 routing including Subnets, VLAN, NAT Traversal (ICE/STUN), Experience leading project team to deliver critical software solutions 3+ years experience in high-availability, scalable and fault tolerant voip infrastructure, 3+ years experience in working with server-side voip infrastructure components like Asterisk/Freeswitch, Kamailio/Opensips including understanding of stack internals 3+ years experience in working with a major cloud platform like AWS (preferred), GCP, Azure, 2+ years experience in design and development of REST-based microservices, 2+ Experience with WebRTC Experience in programming with one of Golang (preferred), Ruby, C/C++ Experience in scripting with shell, python Experience with datastores such as MySQL, Postgres Experience with DevOps tools like Ansible, Jenkins, Terraform, kubernetes, Git Good understanding of data structures, multi-threading and concurrency concepts, Proficiency in working in 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 Haves Experience with custom development on Asterisk / Freeswitch / Kamailio / Opensips is a plus Experience with SIP or any other SIP testing tools Experience with ISDN, WebRTC technologies Experience with elasticsearch queries and visualization tools like grafana, kibana Experience with monitoring frameworks like Nagios, Prometheus Experience with developing Android, iOS based voip clients Experience with Java, Javascript languages