Javascript SDK - Messaging at SendBird
Seoul, KR

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

The challenges range from building a platform that can scale to some of the largest user base 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 difficult problems’ of our customers, and make it as easy as possible for the customers to harness the power of real-time chat.

  • Design and implement key components of the Sendbird JavaScript SDK
  • Build an efficient, lightweight, and high performance client side SDK
  • Write customer-centric documentation and guides
  • Collaborate with design team to design and build user friendly sample applications
  • You have expert knowledge of JavaScript with at least a year of experience developing, shipping, and maintaining web applications
  • You have knowledge of general software design patterns as well as test driven development and other testing frameworks
  • You have deep understanding of web fundamental and web browsers
  • You are proficient in JavaScript with strong object-oriented design skills
  • You are able to work independently and drive results
  • Experience building SDK or chat/messaging system
  • Experience in Typescript / building on native frameworks (e.g., React Native, Cordova, etc.)
  • Experience in learning and adopting latest technologies in JavaScript, Node.js, and other web-related techs
  • Experience participating in product design and architecture
  • English proficiency for business collaboration


Sendbird is the world's leading chat & messaging platform as a service in addition to voice and video. Our mission is to build connections in a digital world.  We believe that digital doesn't have to mean impersonal, that physical boundaries shouldn't create relationship boundaries. We believe in authenticity over superficiality, and in conversations over text messages.  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, and also have offices around the world including Seoul, New York City, London, and Singapore.