Senior Software Engineer & Tech Lead · Ruby on Rails, data & AI
$ whoami
luiz-ximenes - senior software engineer & tech lead
$ cat skills.txt
Ruby on Rails · Python · PostgreSQL · Redis · OCR · NLP · ML · Docker
Selected Work
A focused set of projects chosen for technical depth, product judgment, and execution range.
B2B SaaS · GovTech
Processes 64M+ Brazilian company records (CNPJs) monthly
A tax-focused SaaS platform integrating SERPRO, Receita Federal, SPC, Serasa, and Brazilian court systems, designed for high availability and large-scale fiscal data analysis.
GovTech
Auto-generates compliant procurement artifacts under Brazil's Law 14.133
A web platform that orchestrates the public-procurement planning lifecycle, automatically generating Terms of Reference, preliminary technical studies, and risk maps in compliance with Brazilian Law 14.133.
GovTech · Data
Cut query time from 13s to ~150ms (~98% reduction) with Apache Solr
An advanced search engine and data backbone (LISA) that scrapes, normalizes, and indexes contracts, public tenders, court rulings (TCU/AGU), and Comprasnet data to power planning and analysis at scale.
Data & AI
Processed and indexed 1.2M+ pages across nationwide land-records projects
An OCR and NLP pipeline for large-scale document extraction, classification, and indexing, built to digitize and index over 1.2 million pages of INCRA land records across multiple Brazilian states.
HealthTech · IoT
Real-time vital-sign ingestion with ~200ms average latency
A connected-health platform that ingests and analyzes vital signs from smartwatch PPG + ECG sensors in real time, enabling 24/7 preventive monitoring for elderly, pregnant, and high-risk users.
Smart City · IoT
Brings digital advertising and free public internet to small Brazilian cities
A smart-city solution pairing LED advertising panels with free public Wi-Fi hotspots, remotely managed to deliver municipal announcements, local ads, and digital inclusion to underserved towns.
Writing
A curated list of published essays, not a feed.
Architecting a fiscal-data platform that processes 64 million companies a month
The engineering behind consolidating data on 64M Brazilian companies monthly: idempotency, backpressure, and an alert layer at ~99% availability and p95 ~200ms.
Cutting public-procurement search from 13 seconds to 150 milliseconds
Why the slow path was a modeling problem, not a hardware one: moving retrieval to Apache Solr and designing the index around the user cut query time by ~98%.
Contact
Senior software engineer and tech lead specialized in Ruby on Rails and data-intensive, AI-driven systems. Open to remote roles (international & Brazil), technical leadership, and consulting. Advanced English, with international experience through an exchange program in Australia.