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Owns and improves performance ad products for a 21M-user marketplace, balancing ad revenue with user experience and ML-driven optimization.
Research and mitigate AI-specific threats like prompt injection and LLM agent attacks, automate security testing with tools like promptfoo and garak, and embed security into AI feature design.
Security Engineer focused on detecting, analyzing, and responding to security incidents across customer and internal office environments, improving detection systems, and ensuring compliance with regulations to maintain trust in Daangn’s e-commerce services.
Builds and optimizes large-scale ad-serving systems handling billions of daily requests using microservices, real-time bidding, and ML-driven targeting for a 19M-user marketplace.
Build backend services for Carrot Real Estate, designing APIs and data pipelines to deliver accurate property listings and automate peer-to-peer transactions.
Builds and evolves the backend for ‘나의 당근’, a personalized hub that surfaces next actions using Server Driven UI and connects user activity across Carrot’s services.
Builds and maintains backend systems for a hyper-local community platform, focusing on scalable server architecture, AI-driven recommendations, and seamless integration of neighborhood services like classifieds, events, and trust-based interactions.
Builds and scales Carrot’s identity platform handling millions of logins daily using Go, gRPC, and Kubernetes while balancing security, privacy, and user experience.
Builds scalable GraphQL APIs and event-driven services for a local tutoring marketplace, optimizing traffic and microservice integrations.
Builds and improves frontend features for a local community platform using React, TypeScript, and streaming SSR to connect neighbors via interest-based groups and events.
Builds and improves frontend features for chat, notifications, and user engagement flows in a hyper-local ecommerce platform.
Build and maintain high-quality iOS apps for Carrot Market’s local-commerce platform using SwiftUI, RxSwift, and modular architecture.
Build and improve ML models for personalized recommendations and ad targeting at a Korean local-commerce platform, using deep learning and LLM techniques.
Builds and serves ML models to personalize search results for a local-commerce app, using NLP, graph-based ranking, and real-time inference.
Build and maintain ML infrastructure—LLM routers, metadata systems, and model-serving pipelines—so product teams can ship AI features faster and more reliably.
Contract-based B2B content designer on Karrot (Danggn Market)'s ad sales team in Seoul: designs key visuals, banners, illustrations/infographics, newsletters, LinkedIn/CRM assets, and event materials that promote its expert-mode ad products, collaborating closely with B2B marketers and sales managers using Figma and Adobe tools.
Builds frontend features for Local Jobs, integrating AI to create new user experiences and designing monetization flows that encourage payments.
Builds and optimizes Daangn’s home feed system (35M+ users) by designing scalable backend infrastructure, running A/B tests, and leveraging AI to improve content serving, personalization, and experimentation speed using Go, Kafka, and Kubernetes.
Android engineer at Daangn building and operating features for a large-scale C2C marketplace app used by millions, spanning UI development, client platform SDKs, developer tooling, and app performance monitoring using Kotlin, Jetpack Compose, and AI tools.
This is an Android engineering internship at Daangn, where the intern will contribute to core features like chat and home feeds using Kotlin, Jetpack Compose, and AI-assisted development tools. The role involves collaborating with product teams to improve app performance, stability, and user experience.
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