Giyeon Kim

AX Engineer

Sep 2025 - Present

Rapport Labs / Queenit - AX Team, Seoul, South Korea

Built and operate a TypeScript-based AI agent using OpenAI Agents SDK to automate CX-seller inquiry workflows, currently covering approximately 50% of total inquiry volume.
Designed the workflow around human-in-the-loop review, operational logging, and explicit success/failure/out-of-scope tracking to support safe production use.
Built Raku, a Slack-native agent platform that lets employees invoke Claude Agent SDK, Codex SDK, and custom agents through Slack app mentions and chat streaming interfaces.
Scaled Raku across a 300-person organization, supporting roughly 1,000-2,000 daily agent calls across cron agents, personal agents, custom agents, and live artifacts.
Built a deployment platform that lets non-engineering teams ship AI-assisted Next.js apps and cron jobs with automated build, preview, production deployment, secrets, logs, rollback, domains, and monitoring.
Enabled 35 internal deployments and supported Raku adoption discussions with two companies as an FDE-style technical owner.

Backend Engineer

Feb 2022 - Sep 2025

Rapport Labs / Queenit / 8dogam - Backend Engineering, Seoul, South Korea

Built backend and infrastructure for 8dogam, a new food e-commerce business from Rapport Labs, using Kotlin, Spring Boot, AWS, GitHub Actions, and Argo CD.
Provided end-to-end engineering support during the early stage of the business, covering infrastructure, backend services, and frontend deployment as the sole backend/infrastructure owner for roughly the first eight months.
Designed and operated AWS infrastructure using ECS, EKS, EC2, RDS, S3, CloudFront, and Lambda@Edge.
Improved back-office product search by introducing ClickHouse for complex operational search workloads that were difficult to support with the existing Elasticsearch-based flow.
Reduced coupling across multiple microservices by providing a ClickHouse-backed repository abstraction compatible with familiar JPA Repository and Querydsl-style usage.
Integrated with an RDS CDC pipeline based on Debezium, Kafka, ClickHouse Kafka Connect, and ClickHouse, removing previous product-selection limits caused by slow or constrained search queries.

Server Platform Engineer

Aug 2020 - Feb 2022

Viva Republica (Toss) - Server Platform Team, Seoul, South Korea

Managed API Gateway capabilities for routing and authentication/authorization across Toss services.
Improved API Gateway developer experience by enabling self-service configuration through an internal tool that generated Spring Cloud Gateway-compatible YAML.
Automated gateway change verification, canary rollout, and blue-green deployment so service teams could release gateway changes without waiting on manual platform-team deployment requests.
Related public talk on Toss API Gateway: YouTube
Built a zero-trust communication environment inside production Kubernetes clusters using Istio mTLS, AuthorizationPolicy, PeerAuthentication, and Sidecar resources.
Improved Kafka-to-Elasticsearch service log ingestion performance by replacing or tuning JVM-heavy Logstash-based components and optimizing Elasticsearch field indexing strategy.

Backend Engineer

Oct 2018 - Aug 2020

Hyperconnect - Azar / Hakuna, Seoul, South Korea

Developed Azar API features for user matching quality, including user feature collection and A/B test segment integration into product behavior.
Implemented quest features such as daily missions and attendance checks using Java 8, Spring Boot 2.0, AWS Aurora RDS MySQL, and ElastiCache.
Designed and implemented a high-availability architecture for Azar's stateful STOMP server using Redis Cluster as a persistence layer and NATS as a STOMP-compatible message broker.
Implemented Hakuna direct messaging features, including message send/receive flows, read status, and notifications in a Scala/Akka-based backend environment.

Professional Summary