Looking for a job

Daniel Choi

@danieluser46

I build production AI products, scalable cloud services, and full-stack applications from architecture through delivery.

United States

Message

What I'm looking for

I'm looking to build production AI products and scalable full-stack systems where I can own architecture, improve delivery standards, and mentor engineers.

I'm building AI products at Sigma AI, where I own frontend and backend architecture across React, TypeScript, Next.js, Node.js, Python, AWS, and GCP. I've built an AI sales assistant that automates CRM updates and follow-up sequences, along with LangChain and Hugging Face NLP pipelines for document processing.

Previously at Olive AI, I built healthcare automation platforms connecting fragmented systems across 900 hospitals. I led a monolith-to-AWS-microservices migration using Lambda, SQS, and API Gateway, built synchronization pipelines for EMR, EHR, and payer portals, and led React-based operational tooling.

My experience also includes Google Now backend services serving millions of daily users, where I reduced NLP processing latency by 25%, and Toptal engagements spanning Rails, Node.js, React, Next.js, AWS, chatbots, payments, and AI-powered video products. I focus on clean code, tested systems, and clear communication while mentoring engineers on architecture and delivery standards.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer | Tech Lead

Current

Sigma AI

Nov 2023 - Present (2 years 9 months)

Own frontend and backend architecture for AI products using React, TypeScript, Next.js, Node.js, and Python on AWS and GCP. Implemented micro frontend architecture and built an AI sales assistant that automates CRM updates and follow-up sequences.

React TypeScript Next.js Node Python AWS GCP Hugging Face GraphQL REST APIs CI CD

Senior Software Engineer

Olive AI

Jul 2020 - Sep 2023 (3 years 2 months)

Built and maintained the AI and RPA platform for healthcare automation. Led migration of a monolithic backend to AWS microservices and built data synchronization pipelines across EMR, EHR, and payer portal integrations.

AWS Lambda API Gateway Python React TypeScript Webpack Terraform CloudFormation Microservices RPA Platforms Healthcare

Full Stack Software Developer

Toptal

Aug 2016 - Mar 2020 (3 years 7 months)

Delivered full stack work across multiple client engagements, including building backend services with Ruby on Rails and Node.js, migrating legacy AngularJS to React/Next.js, and developing frontend features for an AI-powered video creation platform.

Ruby on Rails Node.Js Development React Next.js AngularJS Python AWS Database Optimization Chatbot Development

Software Engineer III (L4)

Google

Aug 2013 - Jun 2016 (2 years 10 months)

Contributed to Google Now backend services for voice recognition, predictive search, and personalized notifications. Reduced latency by 25% through optimizing NLP processing and integrated services with Google Cloud Platform.

C Python NLP Google Cloud Platform Machine Learning Performance Optimization