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Software Engineer at Woori America Bank building and modernizing C#/.NET 8 and RESTful backend services across enterprise banking. I’ve shipped APIs to support large-scale loan and internet banking workflows, reduced decision latency dramatically, and built AI-assisted operational tools using RAG over internal documentation and incident history. Previously, I contributed front-end features with React and Stripe integrations, and in research I designed and evaluated LLM-powered pipelines and deployed real-time inference on AWS. I’m also a former founder/product lead who built a two-sided marketplace and secured early funding through accelerator programs.…Software Engineer at Woori America Bank building and modernizing C#/.NET 8 and RESTful backend services across enterprise banking. I’ve shipped APIs to support large-scale loan and internet banking workflows, reduced decision latency dramatically, and built AI-assisted operational tools using RAG over internal documentation and incident history. Previously, I contributed front-end features with React and Stripe integrations, and in research I designed and evaluated LLM-powered pipelines and deployed real-time inference on AWS. I’m also a former founder/product lead who built a two-sided marketplace and secured early funding through accelerator programs.

Yubin Seo (Theodora)

Software Engineer, Back-End Developer, Front-End Developer, +3

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Software Engineer at Woori America Bank building and modernizing C#/.NET 8 and RESTful backend services across enterprise banking. I’ve shipped APIs to support large-scale loan and internet banking workflows, reduced decision latency dramatically, and built AI-assisted operational tools using RAG over internal documentation and incident history. Previously, I contributed front-end features with React and Stripe integrations, and in research I designed and evaluated LLM-powered pipelines and deployed real-time inference on AWS. I’m also a former founder/product lead who built a two-sided marketplace and secured early funding through accelerator programs.…Software Engineer at Woori America Bank building and modernizing C#/.NET 8 and RESTful backend services across enterprise banking. I’ve shipped APIs to support large-scale loan and internet banking workflows, reduced decision latency dramatically, and built AI-assisted operational tools using RAG over internal documentation and incident history. Previously, I contributed front-end features with React and Stripe integrations, and in research I designed and evaluated LLM-powered pipelines and deployed real-time inference on AWS. I’m also a former founder/product lead who built a two-sided marketplace and secured early funding through accelerator programs.

Available to hire

Software Engineer at Woori America Bank building and modernizing C#/.NET 8 and RESTful backend services across enterprise banking. I’ve shipped APIs to support large-scale loan and internet banking workflows, reduced decision latency dramatically, and built AI-assisted operational tools using RAG over internal documentation and incident history.

Previously, I contributed front-end features with React and Stripe integrations, and in research I designed and evaluated LLM-powered pipelines and deployed real-time inference on AWS. I’m also a former founder/product lead who built a two-sided marketplace and secured early funding through accelerator programs.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Beginner

Language

Javanese

Intermediate

Work Experience

Research Assistant (Part Time) at Crackd.ai – Computational Design Lab

July 1, 2025 - December 1, 2025

Designed an LLM humor generation pipeline by refining prompts and cultural/contextual cues based on prior research. Built and publicly launched a React/PostgreSQL LLM caption generator with real-time user feedback. Evaluated 1,000+ LLM-generated responses with 50+ beta participants across cultural relevance, humor quality, and audience fit. Deployed real-time LLM inference on AWS with Python, reducing median response latency by 40% via model-serving and request optimization.

Research Assistant, Part Time at Crackd.ai – Computational Design Lab

July 1, 2025 - December 31, 2025

Designed an LLM humor generation pipeline, iterating on prompts and cultural/contextual cues to improve humor quality based on prior research. Built and publicly launched a React/PostgreSQL LLM caption generator with real-time user feedback. Evaluated 1,000+ LLM-generated responses with 50+ beta participants across cultural relevance, humor quality, and audience fit. Deployed real-time LLM inference on AWS using Python, reducing median response latency by 40% via model serving and request optimization.

Software Engineer at Woori America Bank

September 1, 2023 - Present

Shipped a C#/.NET 8 MVC loan service across 100+ branches, integrating Experian, Equifax, and TransUnion and cutting decision time from 18 minutes to 7 seconds while reducing manual reviews by 38%. Implemented 20+ Fiserv RESTful API endpoints for large-scale Internet Banking modernization, collaborating with vendor engineers to resolve schema and integration issues. Built a Python/FastAPI incident triage assistant using RAG over ~500 internal runbooks and 3 years of historical incidents to replace manual keyword search during on-call triage. Reverse engineered undocumented legacy payment workflows using AI-assisted code analysis to produce an initial API contract and dependency documentation. Remediated 100+ critical vulnerabilities across banking applications to support Coverity Level 1 security compliance.

Front-End Engineer Intern at Hippolabs, Inc.

May 1, 2022 - January 31, 2023

Rebuilt a desktop marketplace into a responsive React.js application, contributing to a 2× increase in user engagement. Integrated Stripe payment APIs and implemented checkout flows for online transactions. Developed admin features for menu management, geolocation, and image uploads to streamline admin workflows. Debugged RESTful API integrations and optimized image loading, reducing mobile page load time by ~35%.

Founder & Product Lead at Personal Shopper

October 1, 2020 - April 30, 2021

Built a two-sided shopper–influencer marketplace and defined the product roadmap, transaction flow, and monetization model. Managed Agile sprints, prioritized features, and presented performance metrics to stakeholders with end-to-end product ownership. Secured $50K in competitive government and university venture funding through startup accelerator programs.