--- title: 'Software Engineer, AI Agent at Sendbird' canonical: 'https://feeny.ai/job/software-engineer-ai-agent-sendbird-seoul-zecachtgchw3' type: 'job' last_seen: '2026-09-13' --- # Software Engineer, AI Agent at Sendbird - **Company:** Sendbird - **Location:** Seoul, South Korea - **Posted:** 2026-02-02 - **Last confirmed live:** 2026-09-13 - **Apply:** https://sendbird.com/careers?gh_jid=8395379002 ## Job description The Company Sendbird is on a mission to build the AI workforce of tomorrow. For over a decade, we built the infrastructure behind conversations—chat, voice, video, messaging APIs—and became the #1 CPaaS platform for in-app communications. 4,000+ brands trust us. 7 billion messages flow through our platform every month. 300 million monthly active users. We powered conversations for DoorDash, Match Group, Noom, Yahoo Sports, Rakuten, and thousands of others. We were good at what we did. Really good. We also saw it early: AI would fundamentally reshape how businesses talk to customers. The infrastructure we'd spent a decade building would become commoditized. The value would move up the stack—into intelligence, into experience, into outcomes. We had a choice: protect what we built, or reinvent ourselves. We chose reinvention. In December 2024, we made the full strategic pivot to AI-first customer experience. By February 2025, we'd launched our AI agent for enterprise CX—built on a decade of conversation data, now with intelligence on top. And in November 2025, we rebranded to Delight.ai. The name says it all. AI's real promise isn't efficiency or cost savings. It's giving customers back something they lost—the feeling of being truly understood and cared for. Not satisfied. Delighted. The Product Delight.ai is the AI concierge for customer experience. Most AI agents forget you the moment the conversation ends. Ours doesn't. Delight.ai builds memory over time, learns preferences, and connects context across every channel—chat, SMS, email, voice, WhatsApp—without losing the thread. We're building AI that makes customers feel understood, seen, and remembered. ## The Role You'll own end-to-end delivery of core AI agent capabilities, from architecture to production, driving excellence across orchestration, prompt engineering, and platform scalability. You'll mentor the engineers around you and set the standard for AI-native development. This role is built for someone who moves fast, thinks in systems, and uses AI to ship at a pace that surprises people. You might be this person if: - You've owned a system that broke in production, made it better, and still think about why it broke. - You use agentic tools like Claude Code or Codex as a core part of your dev workflow, not as a novelty. - You enjoy mentoring junior engineers not because it's expected, but because you genuinely care about how they grow. - You've shipped LLM-powered features into production and have strong views on where prompt engineering ends and architecture begins. - You've led technical planning in a cross-functional setting and can hold your own in a room with PMs, designers, and engineers at once. You need to have: - 3+ years of software engineering experience with direct ownership of AI/ML or backend systems in production. - Deep Python expertise with a proven track record of building and scaling reliable, performant systems. - Hands-on experience with LLM APIs. - Strong system design and architecture skills, including distributed systems and cloud-native deployments on AWS or GCP. - Strong English proficiency. You can communicate complex technical ideas clearly in writing and in conversation. What you'll actually do: - Design and implement core agent features including advanced RAG pipelines, multi-step tool use, and agent orchestration logic. - Drive architectural decisions for the AI agent platform with a focus on fault tolerance, scalability, and extensibility. - Build and optimize evaluation, observability, and classification pipelines that improve agent performance over time. - Lead prompt engineering strategy for diverse customer use cases, including designing A/B testing and automated regression pipelines. - Improve retrieval logic and embedding models to push RAG pipeline performance further. - Monitor AI research and actively bring relevant techniques into production systems, using agentic CLIs and automation tooling to accelerate iteration cycles. - Guide junior engineers and interns through code reviews, architectural discussions, and technical planning. - Partner with PMs, designers, and sales engineers to translate real customer needs into well-scoped technical solutions. Added Value: - Prior experience with real-time or conversational interfaces. - Hands-on experience with agentic frameworks such as LangChain or LangGraph. - Familiarity 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. ## Why Sendbird We're not adding AI to a legacy product. We rebuilt from the ground up with a decade of proprietary conversation data that most AI companies would kill for. The people here are moving with urgency because the opportunity is real and the window is now. If you want to own something that matters and see it ship to millions of users, this is the place. ## About Sendbird ## Company Overview - **One-liner**: Sendbird provides the communication infrastructure and AI agents that power branded customer experiences for enterprises, processing over 7 billion conversations monthly. - **Entity Type**: Private (Series-stage undisclosed; total funding $220M+ across 9 rounds) - **Headquarters**: San Mateo, California, United States - **Founded**: 2013 - **Founders**: Alonso Garzon (Co-Founder & CEO) — other co-founders are not publicly identified in recent sources. ## Core Business - **Primary industry**: Customer experience / Communication Platform as a Service (CPaaS) / AI customer service software - **Target customers**: B2B — mid-market to enterprise (4,000+ brands including DoorDash, Match Group, Noom, Yahoo Sports, Hinge, JustEat) - **Mission**: “Power every meaningful conversation in the world — whether human to human, or human to AI.” ## Products & Services - **Sendbird Communication Suite (APIs)**: A set of APIs and SDKs for in-app chat, voice/video calls, and omnichannel messaging (SMS, WhatsApp, email). Includes real-time chat, voice & video, and push notifications. Enterprise-grade security and compliance. - **delight.ai**: A branded AI concierge that uses AI agents to automate customer support, resolve issues, and seamlessly hand off to human agents when needed. Designed to be conversational, useful, empathetic, and authentic. ## Market Standing - **Valuation**: Not disclosed (last reported funding round was a $165M Series C in 2021 at an estimated $1B+ valuation, but current valuation is not publicly confirmed) - **Key Metric**: Total funding — $220M+ raised; Annual revenue — approximately $30M (LinkedIn estimate for 2024/2025) - **Notable Investors**: ICONIQ Capital, SoftBank Vision Fund 2, Tiger Global Management, Y Combinator - **Growth Signals**: - Headcount of 236 employees (+6.1% YoY as of mid-2025) - Powers 7 billion+ conversations per month across 300M+ monthly active users - Trusted by 4,000+ leading brands - Expanded AI agent offering (delight.ai) and released public roadmap to become an AI-native organization - Active job postings increased +7.1% YoY (15 open roles as of mid-2025) ## Competitive Advantages - **Enterprise-grade infrastructure**: 99.9%+ uptime, <40ms latency, SOC 2 Type II, HIPAA, GDPR, and ISO 27001 certified. - **Global scale**: Supports 6+ billion users worldwide with deployments across 10+ countries. - **AI-native pivot**: Built a full AI agent product (delight.ai) on top of its existing messaging infrastructure, giving it a unique position between CPaaS and AI customer service. - **Deep integrations**: Seamless handoff between AI and human agents, omnichannel unification, and white-glove implementation support. ## Strategic Focus - **AI Workforce of tomorrow**: Sendbird is aggressively building out AI agent capabilities, aiming to let businesses deploy an “AI workforce as big as their ambition.” - **Agent-to-Agent (A2A) future**: The company envisions a world where AI agents connect businesses and individuals directly, reducing human cognitive load. - **Internal AI adoption**: The CEO has turned the entire company into an AI-native organization, with employees building internal tools (CRM, automation) using AI — tracked on an internal platform called “Automators.” - **Growth markets**: Expanding enterprise sales in EMEA and India, and investing in product-led growth for its AI offerings. ## Why Work Here - **Culture**: “Four rules. Zero corporate.” — values include Endless Tenacity, Customers First, Drive Velocity, Always Raise the Bar, High-Agency & Exothermic Leadership, Own Collective Outcomes, Global Citizenship. - **Remote/Hybrid/Office**: Hybrid — offices in San Mateo (CA), Seoul (South Korea), Singapore, and London. Some roles are remote (US-based). Engineering hubs in Seoul and San Mateo. - **Engineering culture**: Strong emphasis on building fast, experimenting with AI, and not waiting for permission. AI tooling is paid for by the company and encouraged in everyday work. - **Perks**: Not detailed in search results, but the careers page promotes “everything you need to do your best work and feel your best.” ## Sources 1. [sendbird.com/about](https://sendbird.com/about) — Company overview, funding, mission, offices, investors 2. [sendbird.com/careers](https://sendbird.com/careers) — Current open roles, values, global offices 3. [sendbird.com/careers/inside-the-build](https://sendbird.com/careers/inside-the-build) — Culture details, AI-native philosophy, employee testimonials 4. [linkedin.com/company/sendbird](https://www.linkedin.com/company/sendbird) — Headcount, revenue estimate, employee growth, executive list, job trends 5. [sendbird.com/learn/what-is-sendbird](https://sendbird.com/learn/what-is-sendbird) — Product descriptions, AI agents, enterprise features ## Other roles at Sendbird - [Sales Development Representative](https://feeny.ai/job/sales-development-representative-sendbird-san-mateo-california-q6nzz9hfbffr) — San Mateo California, United States - [Head of Marketing Operations (Director)](https://feeny.ai/job/head-of-marketing-operations-director-sendbird-san-mateo-california-5t629136zfyv) — San Mateo California, United States - [Security Engineer](https://feeny.ai/job/security-engineer-sendbird-seoul-qzzagfprkcds) — Seoul, South Korea - [Contract Technical Writer](https://feeny.ai/job/contract-technical-writer-sendbird-seoul-7zhfpvse37da) — Seoul, South Korea - [Enterprise Security Engineer](https://feeny.ai/job/enterprise-security-engineer-sendbird-san-mateo-california-31wgwabp562c) — San Mateo California, United States - [Head of Information Security](https://feeny.ai/job/head-of-information-security-sendbird-san-mateo-california-x3qf6pg05dpq) — San Mateo California, United States - [AI Agent Engineer, Intern](https://feeny.ai/job/ai-agent-engineer-intern-sendbird-seoul-mdrby9f58fcn) — Seoul, South Korea - [Machine Learning Engineer](https://feeny.ai/job/machine-learning-engineer-sendbird-seoul-d29c5twkh29a) — Seoul, South Korea - [Forward Deployed Product Manager](https://feeny.ai/job/forward-deployed-product-manager-sendbird-san-mateo-california-jserps076vvn) — San Mateo California, United States - [Software Engineer, AI Agent](https://feeny.ai/job/software-engineer-ai-agent-hex-technologies-san-francisco-ts8pab2zg5yh) — San Francisco, CA