Software Engineer, AI Agent

Sendbird is seeking a Senior Software Engineer, AI Agent to lead core initiatives across our AI Agent platform. This role is central to scaling Sendbird’s vision for proactive, intelligent agent-based customer engagement.

You’ll own complex projects end-to-end—from scoping and architecture to implementation and delivery. You’ll act as a technical mentor, push innovation in agent orchestration, and bringdeep experience in AI/ML and LLM-based systems. The ideal candidate combines technical fluency with a builder’s mindset, bringing AI-powered experiences to life for customers at scale.

What You'll Do

• Technical Leadership
  • Design and lead implementation of core agent features, from advanced RAG pipelines to multi-step tool use.
  • Establish best practices for prompt engineering, agent orchestration, and observability, and testing.
• Agent Platform Development
  • Drive architectural decisions for building a scalable and fault-tolerant AI agent platform. 
  • Focus on developing core AI/ML agent logic and orchestration, ensuring that the intelligence layer powering our agents is robust and extensible.
  • Build and optimize supporting systems and pipelines that improve agent capabilities and performance (evaluation, observability, classification, etc.).
  • Take ownership of the full development lifecycle, ensuring our systems are performant, reliable, and secure.
• Prompt Engineering & Experimentation
  • Lead the development and evaluation of prompt strategies for diverse customer use cases, including designing A/B testing and automated regression pipelines.
  • Optimize agent performance by improving retrieval logic, embedding models, and enhancing RAG pipelines.
  • Stay on the cutting edge of AI research and apply new techniques to improve our platform.
• Mentorship & Collaboration
  • Guide junior engineers and interns through code reviews and technical planning.
  • Work cross-functionally with PMs, designers, and sales engineers to translate customer needs into technical solutions.

Who You Are

• 3+ years of software engineering experience, with AI/ML or backend system ownership.
• Deep expertise in Python, with a track record of building and scaling production systems.
• Strong system design and software architecture skills, with experience in distributed systems and cloud-native deployments (e.g. AWS, GCP).
• Hands-on experience with LLM APIs and agentic frameworks (e.g., LangChain, LangGraph, etc).
• Strong English proficiency, with the ability to read and write effectively.

Extra helpful if you have

• Prior work with real-time or conversational interfaces.
• Experience with vector databases, search technologies, or large-scale data processing.
• Contributions to open-source LLM or AI tooling ecosystems
• Native-level English fluency.

Our KR benefits include (but are not limited to):

• Silicon Valley's equity program (1-year cliff) 
• Hybrid work policy, flexible work hours
• Be Your Best Self: 3.9 million won (prorated by start date) for expenses ranging from professional development classes and training, to personality assessments, to gym memberships, to books, to fitness classes, to mental health services, to massages
• Learn a Language benefit - up to 3.6 million won per year towards language lessons 
• Monthly team building cost
• Partial support for commuting costs
• Free parking at the Seolleung office
• Group insurance support that covers employees, spouses, and children
• Medical checkup support, including MRI and genetic testing - for the employee and one family member
• Seven additional paid holidays in addition to annual leave (Boost leave, Birthday leave, etc.)
• Unlimited snack bar filled with snacks, beverages, and instant noodles every day
• 12-week paid parental leave support (available for both mothers and fathers)
• Other support programs for congratulations and condolences

Flexible Work Policy

We offer a flexible work schedule at Sendbird.  We also value collaboration and relationship building.  With those values in mind, we require all employees to gather with their team in the office three days per week as a minimum.  Some of our roles require a more frequent in-office schedule.  Please work with your manager to understand the office time requirements for your position.

What diversity and inclusion mean to us

There is no such thing as a perfect candidate and the best employees come from a wide range of backgrounds, experiences, and skill sets. Sendbird is a place where everyone can learn and grow. We respect, promote, and encourage diversity for equal employment opportunities and encourage you to apply if this role excites you.

About Sendbird

Combining omnichannel AI and battle-tested, award-winning communication APIs, Sendbird enables businesses to build AI agents and meaningful customer connections at scale. 

Trusted by 4,000+ leading apps—including DoorDash, Match Group, Noom, and Yahoo Sports—Sendbird powers over 7 billion conversations every month, offering exceptional reliability, security, and compliance that meet enterprise-level demands.

Headquartered in California, Sendbird is backed by ICONIQ, SoftBank, Tiger Global, Y Combinator, and other reputable investors.