NexusAI — Agente de Inteligencia Política
by: Tomás Ospina.
Overview
An AI-powered intelligence dashboard for Colombian politics. It ingests RSS feeds from national media, enriches them through Perplexity and Claude, and presents the result as niche analysis, narrative reports and disinformation flags — all behind an authenticated backend that keeps the provider API keys server-side.
Problem & Solution
The obvious way to build this — call the model straight from the browser — leaks your
API keys to every visitor. NexusAI puts an Express proxy in front of every provider:
the frontend talks only to /api/*, the backend holds the credentials, and each route is
wrapped in JWT auth, rate limiting and Helmet headers. A credit system in SQLite bounds
what any single account can spend.
Technical Specifications
| Item | Detail |
| ————- | ——————————————————– |
| Runtime | Node.js 18+, Express |
| Providers | Claude API, Perplexity API, RSS feed ingestion |
| Storage | SQLite via better-sqlite3 — users, credits, cached data |
| Security | JWT (jsonwebtoken), bcryptjs, Helmet, express-rate-limit, CORS locked to the production origin |
| Frontend | Vanilla JS modules — feeds, charts, reports, notifications, assistant |
My Role & Key Contributions
- Designed the proxy architecture that keeps every provider key off the client.
- Built the auth layer (JWT + bcrypt) and the per-user credit accounting.
- Wrote the feed ingestion and the analysis modules: niche detection, disinformation checks, chart generation and report export.
What I Learned
Rate limiting and credits are not an afterthought when the backend pays per token — they are part of the architecture. Putting them in from the first route was cheaper than retrofitting them later.
🔒 Private repository — happy to walk through the code on request.