Senior Product Engineer.
Full-Stack + AI
Gustavo Saiani
Currently building and operating sponda.capital solo.
Senior Product Engineer.
Full-Stack + AI
Currently building and operating sponda.capital solo.
Experience
Delivered core features of the open-source BI platform used by 90,000+ organizations including enterprise and government clients. Improved application performance as the company grew revenues ten-fold. Revitalized public-facing projects through SEO and LLM optimization, contributing to growth from 30k to 90k customers.
Led development of a greenfield React application enabling real-time package tracking, now supporting over 1 billion parcel deliveries annually. Elevated code coverage from 0% to 70%, reducing bugs by 70%. Assembled and managed a team of React developers.
Helped drive over $200M in annual revenue building a Freelancer Profile app serving 7,000+ freelancers across 140+ countries. Built public-facing pages with SSR, achieving $4 per-visit revenues. Implemented A/B testing and personalization during 20% YoY company growth.
Designed and launched a real estate marketplace MVP using React and Elixir. Raised $1M in seed funding and facilitated the sale of dozens of properties in its first months of operation.
Projects
sponda.capital
Fundamental analysis for value investors: inflation-adjusted indicators (PE10, PFCF10), screening, and side-by-side comparison across ~23k listed companies. Designed, built, and operated solo. CI with sharded e2e, Docker, nginx, multi-layer caching.
plau.design
In-house font marketplace for a Brazilian type foundry: catalog, checkout, licensing, and delivery. Stripe abroad, Mercado Pago cards with installments and Pix in Brazil. A portal where designers and foundries set their own prices, coupons, and launch tiers, upload fonts, and track sales and royalties. Portuguese, English, and Spanish.
ai-tech-support.gustavosaiani.com
Live AI support agent: a router hands off to specialist agents, which answer from a ChromaDB knowledge base over tool calls, streamed token by token. Semantic caching, per-customer rate limiting, and per-request cost and token accounting. Capstone of a 15-module AI engineering curriculum built for portfolio over credentials.
doingit.online
Minimalist task and time tracker. Type a task name and start the clock.
poe.ma
Value investment partnership. 339% cumulative returns from Jan 2017 to Jun 2026, outperforming the Brazilian stock index by 1.8x.
noralab.com.br
AI for healthcare professionals: a WhatsApp agent that books real appointments through Google Calendar, plus clinical note-taking tools. Built and shipped with a team of three.
Skills