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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.
Owns the core account-opening, KYC, and deposit/withdrawal experience for Toss Securities in Japan, turning regulatory constraints into user-centric product solutions.
Owns the US equity product for Japanese users, researching pain points, defining problems, and iterating on features to deliver intuitive investing experiences while navigating Japan’s regulatory landscape.
ML Engineer at Toss builds and deploys recommendation, search, and AI models across fintech and ecommerce to optimize product exposure, CTR, and user experience using PyTorch, Spark, and Kubernetes.
Build and operate ML/LLM platforms for a Korean neobank, focusing on stable, scalable, and secure model training, deployment, and serving using tools like MLflow, Kubeflow, Triton, and vLLM.
Builds and operates a machine-learning platform for a securities app, focusing on LLM serving, gateway systems, and MLOps tooling in Kubernetes.
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-based automation platforms at a fintech securities company, using TypeScript, NestJS, and distributed systems tools to streamline customer and internal services.
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.
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.
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.
Leads the product vision and strategy for Toss Pay’s offline payment innovations, collaborating with cross-functional teams to drive expansion, merchant tools, and customer experiences.
Owns fintech products that simplify tax and income management for millions of users, turning complex regulations into intuitive experiences.
Owns fintech products like payments, lending, or ads at Toss, setting goals, running experiments, and iterating to improve user outcomes and business metrics.
Owns the lifecycle of Toss’s ad products, from defining KPIs and business models to launching features, analyzing performance, and iterating with stakeholders.
Owns core commerce features like ads, order flow, search, and promotions for Toss Shopping, a fast-growing B2C ecommerce platform.
Leads global fintech product development for Toss, defining strategy, metrics, and cross-country growth initiatives while driving data-driven experiments to achieve product-market fit in expanding markets.
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