Hi! I’m Juan David.
You can call me “Lipez”
I’m a Software Engineer studying Systems Engineering in Bucaramanga, Colombia. I enjoy building software, making it efficient, and finding new ways to solve problems.
Currently a QC Auditor at Scale AI (more)(I audit RLHF and SFT datasets before they ship), and lead developer at CALUMET , where I rebuilt COMA, the academic platform the whole campus runs on (more)(login went from 840 ms to 29 ms, heap from 1.40 GB to 69 MB). Also built Suamox (more)(server loaders and hybrid rendering, not just a build step), a React meta-framework with SSR and file-system routing.
Work
Scale AI2024 - Present
QC Auditor since August 2025. I audit RLHF and SFT datasets before they reach the client: score each task against the rubric, write the feedback, and hold back what doesn’t meet the bar. Started in 2024 as an AI Training Specialist.
CALUMET2023 - Present
Team Project Lead at the student engineering group of my university. I lead development on COMA, the academic platform, built on a 20-year-old Java EE monolith. Reworked its permissions around a single authorization filter and one shared cache, and now lead its rebuild in Java 25 and Spring Boot 4 with a React 19 SSR frontend.
On the board since May 2024, where I set the roadmap and designed the architecture replacing the monolith.
Projects
Suamoxopen source
A React meta-framework on Vite and Hono. File-system routing with dynamic, catch-all and grouped routes, server-side loaders, and hybrid rendering across SSR, SSG and the client.
Seven npm packages: the routing Vite plugin, the core runtime that matches routes and runs loaders, the Hono adapter, head management, the client router, the CLI and the project scaffolder. Islands are next.
Eliseopen source
CALUMET’s frontend platform: a design system on Radix primitives and Tailwind, plus the utilities around it. Eight published packages covering 85 accessible UI components, forms with Zod, data tables, toasts, alerts, i18n, icons and a shared linter config.
Server Functions with AIhackathon
Function-as-a-service in the shape of AWS Lambda. Each function runs in an isolated JavaScript worker, and AI writes the deployment from a plain-language description.
I also write about what I build, over at Writing.
Wanna discuss a project or just say hi? Let’s grab a coffee