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São Paulo, Brazil

Lucas Casa Mausa

I build web products and AI agents, backed by hands-on experience running financial systems in production.

What I do

01 —

Products

Complete websites and systems, from the database to the pixel.

02 —

Applied AI

Agents and automations that do real work.

03 —

Foundation

Financial backend in production: money never doubles, data never leaks.

Work

Each project is a technical plate. Open the case to see the problem, the solution and the decisions.

Plate 01
Caller voice

CreditPulse AI

A voice agent that pre-qualifies mortgage applicants in a single conversation.

  • Python
  • FastAPI
  • WebSocket
  • AssemblyAI
  • React 19
  • TypeScript
  • Tailwind 4
  • Web Audio API
View case →
Plate 02
Your appRedis

fast-semantic-cache

A cache for AI calls: repeated questions come back in milliseconds, without paying the API again.

  • Python
  • FastAPI
  • Redis
  • Pydantic v2
  • MinHash/LSH
  • k6
  • pytest
View case →
Plate 03
React + Motion

THREADS

Concurrency and parallelism explained with animation, not slides.

  • React 19
  • Vite
  • Framer Motion
  • Zustand
  • FastAPI
  • SQLAlchemy 2
  • PostgreSQL 17
  • Docker
View case →
Plate 04Collaboration
Site + blogAdmin panel

Kiwibit

Website, blog and members area for a tech collective, built as a team.

  • Next.js 16
  • React 19
  • TypeScript
  • Tailwind 4
  • Prisma 7
  • PostgreSQL
  • NextAuth
  • Jest
View case →
Plate 05Confidential
Organizations

Plataforma financeira

A multi-organization financial platform, in production.

  • TypeScript
  • NestJS
  • Prisma
  • PostgreSQL
  • Redis
  • BullMQ
View case →
Plate 00
Visitor

Este agente

This portfolio's agent: it understands your project and returns an initial scope with a timeline.

  • Next.js
  • Vercel AI SDK
  • TypeScript
  • Zod
  • Upstash Redis
  • Resend
View case →

Lab

Experiments and studies that haven't become products yet.

  1. [01]

    gobalance ↗

    L7 load balancer in Go with a standard-library core: round-robin, least-connections, active health checks, circuit breaker and rate limiting.

    Go · Prometheus · Docker

  2. [02]

    vulnlab

    Web security lab: nine OWASP Top 10 vulnerabilities exploited hands-on, from SQL injection to SSRF.

    Python · Flask · Docker

  3. [03]

    copilot-agents ↗

    Eight custom GitHub Copilot agents for code review, security, architecture, performance and documentation.

    GitHub Copilot · Prompt engineering

LCM

About

I'm a software engineer in São Paulo. Day to day I work on financial systems in production, across backend, frontend, integrations and applied AI. That's where I learned that the interesting part of a system is what happens when something goes wrong. I bring that same care to the products I build for others.

How I work

  • Spec before code

    The problem written down, alternatives compared and risks listed before the first line.

  • Measure before deciding

    Performance, cost and behavior checked against real data, not guesswork.

  • AI with rigor

    I use AI agents every day, with review, tests and ownership of every line that ships.

Let's build something

Tell me what you need.

© 2026 Lucas Casa Mausa