Josh Choi

As the co-founder, I built CreatorGen, an AI-powered content-generation platform for marketers and creators producing hyper-realistic AI influencers and automated video campaigns. Backed by the Alliance Accelerator, we raised $500,000 and pitched to hundreds of investors at Demo Day. From January to August 2025, I took the product from concept to a launched full-stack SaaS.

I developed the product end-to-end—a React front end (Zustand, Tailwind, Material UI) and a Node.js, Express, and MongoDB back end—and built the AI generation pipeline by integrating OpenAI, Replicate, Fal AI, Runway ML, and ElevenLabs for AI image, video, and text-to-speech output, with media stored and served via AWS S3. I also implemented the full SaaS business layer: Stripe subscription billing, a usage-based credit system, Web3 authentication through Privy, an admin dashboard, and a content marketplace. The platform was monitored with Sentry and PostHog and deployed on Heroku.

As a lead full-stack engineer, I built the MVP and marketing site for Vers (October to December 2025), a developer infrastructure platform that lets teams branch live virtual machines—memory, processes, and sockets—like Git branches, primarily to run parallel AI-agent workloads. I took the product from zero to launch.

I developed the application end-to-end in Next.js, TypeScript, React, and PostgreSQL, building GitHub OAuth via NextAuth, organization management, role-based access control, API-key issuance, and multi-tier subscription billing. On the front end, I built two standout pieces: an in-browser web terminal emulator with Xterm.js and interactive 3D visualizations of live VM branch trees using Three.js and React Three Fiber, animated with Framer Motion and Lottie. I also shipped the marketing landing page, a blog system, and developer documentation, instrumented with PostHog analytics and covered by Playwright and Jest, all containerized with Docker.

I was contracted as the lead full-stack engineer from March 2023 to May 2024, building the product that supported Vandra's $6 million seed raise in Q1 2024. I delivered the full product surface—a consumer-facing Shopify Theme extension, a Shopify Checkout extension, a merchant portal, and an internal admin portal—primarily in React, Python, and PostgreSQL, against the Shopify API.

I also engineered the data and ML layer behind Vandra's core value: a data pipeline feeding H2O machine learning models that generated AI-driven discounting decisions in real time. To support it, I built a suite of microservices that automated order syncing, calculated merchant performance analytics, and managed the ML pipelines, giving merchants clear visibility into how dynamic discounting moved conversion and revenue.

I was contracted as a senior React developer from October 2022 to January 2023 on REITIUM, a platform built to make private real estate investing simple, secure, and accessible to everyday investors. As part of a small agile team, I developed the consumer-facing investment portal in Next.js, React, TypeScript, Redux, and Tailwind CSS.

I built the core member experience—email authentication, the investor dashboard, a marketplace for browsing and committing to private real estate and fixed-income deals, and a portfolio view for tracking holdings—wiring the front-end to back-end services through REST APIs and MongoDB. The result was a polished, trustworthy investing experience that let individuals discover, evaluate, and invest in offerings that were previously hard to access.