Logan – Python, Typescript, AI agent development, experts in Lemon.io

Logan

From South Korea (UTC+9)flag

Full-stack Web Developer|Middle
Back-end Web Developer|Middle
Front-end Web Developer|Senior

Logan – Python, Typescript, AI agent development

Logan is a Senior Frontend Engineer with strong full-stack and product experience and 10+ years of working with startups, specializing in React, TypeScript, and end-to-end product development. He has built and launched products from the ground up, combining strong frontend expertise with experience across Python, backend development, AWS, and AI/LLM technologies. Logan demonstrates strong product ownership, clear communication, and a practical approach to engineering decisions. He is particularly well suited for greenfield and founder-facing projects where adaptability and user experience are key.

10 years of commercial experience in
AI
Healthcare
Renewable energy
Software development
Financial asset management
Main technologies
Python
10 years
Typescript
10 years
AI agent development
1 year
React
6 years
AWS
6 years
Additional skills
MongoDB
Node.js
Redis
Vue.js
GCP
Flask
PHP
LangGraph
LLM
MLOps
Direct hire
Possible
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Experience Highlights

Senior Software Engineer
Jan 2026 - Sep 20267 months
Project Overview

Live solar generation forecasting platform providing day-ahead forecasts for utility-scale CAISO solar plants and benchmarking predictions against CAISO’s own forecasts.

Project gallery:
Portfolio example for Americast (Open Source Project) by Logan, Senior Software Engineer
Responsibilities:
  • Built and deployed the forecasting platform end-to-end, from data processing and model development through production delivery;
  • Developed day-ahead solar generation forecasting models using LightGBM and HRRR weather data;
  • Built an automated pipeline to generate and publish daily forecasts for utility-scale solar plants;
  • Implemented performance benchmarking against CAISO’s own generation forecasts;
  • Developed a public web application for visualizing and comparing forecast results.
Project Tech stack:
LightGBM
Senior Software Engineer
Jan 2026 - Sep 20267 months
Project Overview

AI-powered financial research platform that uses SEC filings to analyze companies and generate interactive company relationship graphs.

Project gallery:
Portfolio example for DingRC (Open Source Project) by Logan, Senior Software Engineer
Portfolio example for DingRC (Open Source Project) by Logan, Senior Software Engineer
Responsibilities:
  • Built the product end-to-end, from architecture and implementation through deployment;
  • Developed a RAG-powered financial analysis agent using LangGraph, Mem0, and SEC filing data;
  • Built the FastAPI backend and React frontend for interactive financial analysis and company relationship visualization.
Project Tech stack:
RAG
FastAPI
React
LangGraph
Python
LLM
Typescript
Senior Software Engineer
Jan 2023 - Sep 20237 months
Project Overview

AI-powered microbiome health platform providing at-home gut health testing and personalized insights based on scientific research.

Project gallery:
Portfolio example for Jona by Logan, Senior Software Engineer
Responsibilities:
  • Engineered MLOps infrastructure on AWS, integrating laboratory data with proprietary AI models to generate personalized health reports;
  • Architected and implemented the end-to-end technology stack for the microbiome health MVP as a founding engineer, spanning frontend applications, APIs, databases, and cloud infrastructure.
Project Tech stack:
AWS
CloudWatch
ElastiCache
MongoDB
Node.js
Python
React
Redis
Typescript
Senior Full-Stack Engineer
Oct 2019 - Oct 20212 years
Project Overview

Browser-based live streaming and recording platform enabling content creators to host guests, customize broadcasts, and stream across multiple social platforms.

Project gallery:
Portfolio example for Melon by Logan, Full Stack Engineer
Responsibilities:
  • Led development and UI design of the browser-based live streaming platform;
  • Delivered high-throughput, real-time video products using WebRTC, HLS, and RTMP;
  • Designed and built greenfield products for streamers and content creators.
Project Tech stack:
PHP
Vue.js
WebRTC
Founder & Senior Software Engineer
Dec 2017 - Sep 20191 year 8 months
Project Overview

Livestreaming education platform enabling independent teachers to host real-time remote classes and build online learning communities.

Project gallery:
Portfolio example for Homeroom by Logan, Founder
Responsibilities:
  • Built the livestreaming education platform end-to-end;
  • Grew and supported a learning community of 50+ teachers and 400+ students.
Project Tech stack:
Nginx
JavaScript
React

Education

2015
Computer Science, Philosophy, and Psychology
Bachelor of Arts

Languages

Korean
Pre-intermediate
English
Advanced

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