Software Engineer - Back End, Voice & Video at SendBird
Seoul, KR

The engineering team at SendBird is solving some of the biggest challenges related to building reliable, feature-rich, and scalable real-time conversational experiences across different platforms.

The challenges range from building a platform that can scale to some of the largest user-bases across distributed environments with optimal latency; creating a feature-rich yet lightweight and high performance client-side SDK; and building products and services that can help customers incorporate real-time conversational technologies more rapidly.

You will be participating in building the best real-time conversational products and solutions possible. You are expected to learn and expand on your engineering knowledge and experiences to build a world-class product that solves the difficult problems of our customers, and make it as easy as possible for them to harness the power of real-time chat.


Build a highly available and scalable real-time voice & video service backend

Design simple, intuitive RESTful API and events services 

Maintain high qualities for WebRTC services and features

Write customer-centric documentation on API and relevant services 

Deploy and operate server clusters within a cloud environment


2+ years of experience developing experience developing, shipping, and maintaining back-end services

Understanding of multi-threading and high performance distributed architecture

Understanding of RDBMS, NoSQL, and distributed databases

Ability to find the root cause of problems with a minimal set of information and data points and understands the concepts of under-engineering and over-engineering

Able to work independently and drive results


Experience in building service using technologies such as VoIP, WebRTC, SIP, RTP/RTCP

Experience in working video coding standards such as VVC, AV1, HEVC, H.264/AVC, SVC, AVS, VPx

Experience handling massive concurrent connections and processing large-scale traffic

Interest in working for a fast-growing global startup

English Proficiency for business collaboration


SendBird is the world's leading chat & messaging platform as a service. Our mission is to digitize human interactions for businesses. Our platform delivers billions of messages per month to help people connect through the products and apps they love.

We’re a Y Combinator alumnus (W16) and have raised over $120M from leading investors including ICONIQ Capital, Tiger Global Management, Shasta Ventures, August Capital, and FundersClub. We are headquartered in San Mateo, CA (50+ employees) with an Asia-Pacific office in Seoul (100+ employees).