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Designs and maintains data models for Toss’s commerce, ads, payments, growth, and business domains, ensuring reliable, standardized data for analytics and product development using SQL, Python, and Hadoop.
Build and maintain scalable data pipelines and infrastructure to support Toss’s fintech products and analytics needs.
Designs and operates scalable data pipelines (ingestion, streaming, batch) for real-time user behavior analytics, enabling targeting, recommendations, and performance tracking in a fintech platform. Core techs: Spark, Kafka, Flink, Airflow, and distributed storage (HBase, Cassandra).
Build and optimize real-time data pipelines for Toss Securities, using Kafka, Flink, and OLAP systems to process high-volume financial transactions instantly.
Leads end-to-end AI/ML product development at a fintech bank, defining user-facing features, collaborating with data scientists and engineers, and driving business impact through experiments and metrics.
Leads UX strategy for Toss Securities, defining core investment-product problems and driving user-centric design across the team to scale trust and experience alongside business growth.
Leads hardware quality for Toss’s payment terminals, defining tests, auditing global manufacturing partners, and driving root-cause fixes to hit yield and reliability targets.
Develops and optimizes Android-based payment terminal software, collaborating with hardware/firmware teams to resolve system-level issues (framework, HAL, native layers) and ensure real-world device stability from development to post-production.
Designs and executes QA tests for Android-based payment terminals, focusing on hardware-software integration, test automation, and field issue analysis to ensure release quality and improve testing processes.
Build and maintain Kubernetes-based cloud-native infrastructure at a leading Korean fintech company, automating deployments and improving developer experience.
Build and refine CI/CD pipelines and Kubernetes-based infrastructure for Toss Securities, focusing on developer experience and robust monitoring to enable rapid, safe deployments.
Build and maintain Kubernetes-based cloud-native platforms to enable fast, safe deployments and resilient operations for Toss’s offline payment ecosystem.
Build and maintain cloud-native infrastructure on AWS EKS to enable fast, secure deployments for insurance products using Kubernetes, Terraform, and observability tools.
Build and refine Kubernetes-based CI/CD pipelines and observability tooling to help Toss developers deploy and debug services at scale.
Support the CEO of a fintech company by managing schedules, prioritizing meetings, and coordinating communication to ensure strategic decisions are made efficiently.
Build cross-platform POS and payment kiosk apps in React/TypeScript, integrating with hardware and backend systems to modernize offline retail.
Builds and optimizes React/TypeScript-based web services for Toss’s fintech apps, focusing on performance, scalability, and seamless user experiences while collaborating with cross-functional teams in a matrix structure.
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.
Conducts global user research for Toss, designing and running interviews and studies to uncover cultural insights and shape fintech product experiences across markets.
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