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Build and deploy AI models (LLM, RAG, multimodal) to automate commerce tasks like seller evaluation and product search at Toss’s ecommerce unit.
Build, train, and evaluate in-house large language models to replace costly commercial LLMs for Toss’s services, focusing on Korean language and domain-specific capabilities.
Build and operate the AI platform that lets teams at Toss rapidly experiment with and deploy LLM-based systems like RAG and Agents, focusing on retrieval, generation, and vector search components.
Build cross-platform POS and payment kiosk apps in React/TypeScript, integrating with hardware and backend systems to modernize offline retail.
Senior frontend developer building tax and income services for Toss’s fintech ecosystem using React, TypeScript, and Next.js.
Builds and maintains Toss’s design system and UI components using React, TypeScript, and animation libraries to ensure consistent, high-performance user experiences across all services.
Designs and operates data-center infrastructure (network, servers, storage, power, space) for Toss Securities, focusing on stability, automation, and standardization.
Build and own iOS features for Toss’s super-app, including payments, banking, and insurance, using Swift, Combine, and modular architecture.
Owns the core account-opening, KYC, and deposit/withdrawal experience for Toss Securities in Japan, turning regulatory constraints into user-centric product solutions.
Designs and builds backend services for AI-driven banking products, focusing on scalable ML model serving and robust server architecture in a microservices environment.
Builds and deploys AI/ML systems for banking services like fraud detection, lending models, and LLM-based agents in a high-traffic, regulated environment.
Design and build a zero-trust VPN and network-access controls; implement cross-platform clients and reverse-tunnel infrastructure while analyzing traffic for anomalies.
Build and maintain Node.js/Nest.js backend services and automation tools to streamline TossPlace’s terminal lifecycle and logistics operations using TypeScript, MySQL, and React.
Build and maintain Node.js services for a leading fintech platform, handling payments, banking, and financial infrastructure.
Develops payment software for offline terminals, integrating with card processors and security standards like EMV and Apple Pay across Android, Windows, Linux, and RTOS environments.
Owns internal banking platforms that support loan, deposit, and card teams, designing admin systems and automating workflows to boost productivity for Toss Bank’s staff.
Designs and builds shared infrastructure like authentication, finance, and risk systems that power Toss’s products and teams.
Own the Facepay platform that powers facial-recognition payments across stores, offices, and apps, coordinating hardware integrations, partner requirements, and end-to-end delivery.
Owns Toss’s global identity, KYC, account, and membership platforms that underpin all country-specific products, aligning stakeholders and driving shared infrastructure for fintech services.
Designs intuitive UX/UI for Toss Place’s offline payment solutions, visiting stores to solve real-world merchant and customer pain points.
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