Sr Software Engineer, IOS, Messaging SDK 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 experiences across different platforms.

The challenges range from building a platform that can scale to some of the largest userbases 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 iOS 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

Capable of finding the optimal solution given the resource constraints, and understands the concepts of under-engineering and over-engineering


You have expert-level knowledge of iOS with at least 5 year of experience developing, shipping, and maintaining mobile applications

You are able to work independently and drive results

You are proficient in Objective-C or Swift with strong object-oriented design skills

You have knowledge of general software design patterns as well as iOS design patterns

You have a deep understanding of iOS framework internals

Capable of finding the root cause of problems with a minimal set of information and data points


Experience building SDK or chat / messaging system

Wide range of experience from the front-end to the back-end

Experience in various languages and frameworks

Experience participating in product design and architecture

Experience in learning and adopting latest technologies on iOS platform


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 (50+ employees) with an Asia-Pacific office in Seoul (100+ employees).