To succeed in the Sendbird interview process, you must demonstrate a blend of technical mastery, analytical problem-solving, and strong communication skills. Our evaluation process looks beyond just correct answers; we want to understand how you think, collaborate, and execute.

Technical & Architectural Excellence – You must show a deep understanding of core software engineering principles, clean code practices, and system scalability. Your interviewers will evaluate how well you structure your code, write tests, and optimize for performance and low latency.

Problem-Solving & Adaptability – We value engineers who can break down ambiguous, complex problems into manageable components. You should be comfortable discussing trade-offs, explaining your reasoning, and pivoting your approach when presented with new constraints or edge cases.

Communication & Collaboration – As an engineer, you will collaborate closely with product managers, platform managers, and business analysts. You need to articulate your technical designs clearly, justify your architectural choices, and demonstrate that you are receptive to feedback and alternative perspectives.

Value Fit & Resilience – We look for candidates who are customer-obsessed, proactive, and resilient in the face of engineering challenges. Your ability to show ownership, learn from failures, and maintain a growth mindset is critical to thriving in our fast-paced environment.

The Sendbird interview process is thorough and designed to evaluate both your immediate technical contributions and your long-term growth potential. From your first interaction, you will experience a highly professional and structured sequence that respects your time and provides clear checkpoints. The process is competitive but highly collaborative, reflecting the day-to-day working culture of our engineering teams.

Your journey begins with a brief recruiter screen, followed by a technical assessment that tests your practical coding and integration skills. If you pass these initial stages, you will move to a comprehensive virtual onsite loop consisting of deep technical deep dives, system design challenges, and cross-functional conversations. Throughout each stage, our interviewers aim to evaluate your practical engineering abilities rather than your capacity to solve abstract brainteasers.

This visual timeline illustrates the standard progression from your initial application to the final offer stage. You should use this overview to pace your preparation, ensuring you allocate sufficient time to practice coding, system design, and behavioral scenarios before each corresponding round. While the exact steps remain consistent, the specific focus of the technical rounds may be tailored to the team or specialized role you are interviewing for.

To excel at Sendbird, you must understand the specific technical domains where our engineers spend most of their time. We evaluate candidates rigorously in these key areas to ensure they can contribute to our core platform and developer tools from day one.

Coding and Platform Integration

Writing clean, performant code is the foundation of everything we do. In these sessions, we evaluate your ability to translate logic into working software, use appropriate data structures, and integrate APIs seamlessly.

Be ready to go over:

• API and SDK integration – Understanding how client-side applications interact with backend services and how to configure SDK features effectively.
• Asynchronous programming – Handling concurrent operations, managing event loops, and preventing blocking calls in real-time environments.
• Code structure and readability – Writing clean, modular, and self-documenting code that your peers can easily maintain.
• Advanced concepts (less common) – Implementing custom protocol wrappers, handling network-level retries, and designing local caching strategies for offline client states.

Example questions or scenarios:

• "Set up a basic messaging client using a mock SDK and implement a feature that batch-processes unread message counts."
• "Write a thread-safe implementation of a message queue that prioritizes urgent payloads."

System Design and API Architecture

Our platform handles billions of messages daily, making system architecture a critical evaluation area. You must demonstrate that you can design resilient, distributed systems that scale horizontally.

Be ready to go over:

• Real-time communication protocols – Designing systems around WebSockets, polling, and long-lived connections.
• Scalability and caching – Implementing caching layers, database sharding, and load balancing to handle massive traffic spikes.
• Fault tolerance and recovery – Ensuring high availability, designing failover mechanisms, and managing data consistency across regions.
• Advanced concepts (less common) – Designing multi-tenant architectures, managing connection pooling at scale, and implementing backpressure handling in pub/sub systems.

Example questions or scenarios:

• "Design a presence tracking system that monitors the online/offline status of 50 million active users in real time."
• "Architect a global chat history storage service that guarantees low-latency reads while maintaining strict data privacy compliance."

Core Language Proficiency (Python/Go)

We expect our engineers to have a deep command of their primary programming languages. Whether you are building core services or writing developer content, your language-specific knowledge must be highly advanced.

Be ready to go over:

• Concurrency models – Understanding how your chosen language handles multi-threading, multi-processing, and async routines.
• Memory management – Optimizing memory allocation, understanding garbage collection, and preventing leaks in long-running processes.
• Standard libraries and frameworks – Leveraging the best tools within your language ecosystem to write efficient and idiomatic code.
• Advanced concepts (less common) – Profiling CPU bottlenecks, optimizing interpreter performance, and writing custom extensions for performance-critical paths.

Example questions or scenarios:

• "Explain how the Python Global Interpreter Lock (GIL) impacts multi-threaded applications, and how you would design around it for a CPU-bound task."
• "Optimize a high-throughput data parsing script to minimize memory overhead and execution time."

As a Software Engineer at Sendbird, your day-to-day work will directly impact our global developer community and the millions of end-users who rely on our technology. You will be responsible for designing, developing, and maintaining high-performance messaging infrastructure and developer tools.

• Design and build scalable APIs: You will architect and implement robust, secure, and low-latency APIs that power real-time chat, voice, and video communication across various platforms.
• Develop developer-centric content and SDKs: If you are in a Content Engineer or SDK-focused role, you will create sample applications, starter kits, and integration guides to make our platform incredibly easy for external developers to adopt.
• Collaborate across teams: You will work closely with product managers, platform managers, and business analysts to define product requirements, evaluate technical feasibility, and align engineering efforts with business metrics.
• Optimize system performance: You will continuously monitor, profile, and optimize our distributed systems to handle massive concurrency, reduce latency, and improve resource utilization.
• Maintain engineering excellence: You will participate in code reviews, write comprehensive automated tests, and contribute to our internal documentation to maintain high standards of code quality and system reliability.