2026
30–35s → 3–5s cold
Financial Analytics API
Retail pricing intelligence over ClickHouse — 30–35s per query down to 3–5s cold and under 2s warm, built from the schema up.
.NET 10ClickHouseC#Redis
Projects
Things I've built
Production systems from Mobility Global and Visa, and the side projects where I try things out.
01/At work
2026
30+ engineers · 3 apps live · 10+ coming
Multi-Team Frontend Platform
Module Federation shell, shared BFF and contract packages, and the CI gates that keep several teams from breaking each other.
Module FederationRspackFastifyAuth0
2022–2025
20M+ requests a month
Visa Card Eligibility Service
Real-time eligibility and benefit redemption APIs — .NET Core and Spring Boot microservices at production scale.
.NET CoreSpring BootC#Java
2022–2025
99.99% uptime redemption pipeline
Visa Digital Benefits Platform
Benefits orchestration for issuers — real-time activation, tier rules, and banking integrations on Spring Boot.
Spring BootJava 17IBM DB2REST APIs
2022–2025
40% faster page loads
Visa Click to Pay
Streamlined cardholder checkout — migrated from a Backbone/jQuery front end to Next.js and React (40% faster page loads).
ReactTypeScriptBackbone.jsSpring Boot
2024
4–5 → 2–3 months
GenAI Contract Assistant
RAG over legal negotiation playbooks: ~90% top-3 retrieval in UAT, B2B contract cycle time down 40–50%.
PythonLangChainOpenAI APIRAG
02/Side projects and experiments
- Real-Time Collaborative EditorYjs + Monaco over Socket.IO with append-only Postgres log, snapshots, and Clerk-secured relay.React 19 · Yjs · Monaco
- Mobile Events Social PlatformExpo + Firebase vertical slice for IRL-first social — messaging, events schema discipline, and TestFlight playbooks (archived).React Native · Expo · Firebase
- 2020–21First MERN Stack (Memorial Platform)First production MERN — dual dev servers locally, one origin behind NGINX in prod.React · Express · MongoDB
- 2022Team MERN Exam Workflow CapstoneCOVID-era clinical UI capstone — displayPatient, exam tables, and serious Redux monorepo practice.React · Redux · Express
- Public API Course DashboardTypeScript BFF + CRA client — aggregation, rate limits, and API-native filters vs app-tier filtering.TypeScript · React · Express
- 2019MasterPlan (Course Matching)Tag overlap + prereq checks — explainable matching before frameworks or LLMs.JavaScript · Algorithms
- 2022macOS Wallpaper PickerDesktop automation — download full-res photos and apply as macOS wallpaper.Swift · SwiftUI · macOS
- Expo React Native ExperimentsCamera, routing, and 3D spikes before the archived Firebase social codebase.React Native · Expo · Three.js
- Perpetual GemsAngular SSR + Express lead capture — trust-heavy local service UX at perpetual-gems.vercel.app.Angular · TypeScript · Express
- Astro + Bun Landing TemplateResale-ready marketing shell — one data file for copy, theme toggle, SEO, and e2e on preview.Astro · Bun · TypeScript
- Browser Music VisualizerWavesurfer + Web Audio in the browser — Goose for scaffolding, manual work on the audio graph.React · Vite · Wavesurfer.js
- Gemini AI Backend (SSE)Managed Gemini + SSE streaming, deterministic matching math, and Firebase-backed chat context (experiment A of two).Gemini · Fastify · Redis
- Self-Hosted 13B LLM InferencevLLM on a GPU pod — WebSocket spike, batch generate() chunked for UX, and why experiment A’s SSE pattern should have been reused (experiment B).vLLM · FastAPI · Python
- Personal Website (current)danielastudillo.io — Next 16, 20+ MDX posts, highlights and projects pages, Apple-inspired design.Next.js · TypeScript · Tailwind CSS
- Personal Website v3 (archive)v3.danielastudillo.io — editorial Next 16 design, kept as a live archive.Next.js · TypeScript · Tailwind CSS
- Personal Website (Next v2 subdomain)v2.danielastudillo.io — intermediate Next deploy between Gatsby v1 and the later editorial v3.Next.js · React · Vercel
- Personal Website v1 (Gatsby)v1.danielastudillo.io — Gatsby + GraphQL time capsule.Gatsby.js · GraphQL · React
- Roguelike GameROT.js roguelike with Vite — dungeon combat prototype inspired by Binding of Isaac.ROT.js · Vite.js · JavaScript