Hi, I'm Hugo.
Software engineer at CESAR, in Campo Grande, Brazil. I build web apps and infrastructure at work, side projects at home, and I brew beer.
Brewing
In the brewery · updated Oct 20
See everything on tap →- ABV
- 5.3%
- IBU
- 18
- OG
- 1.044
- FG
- 1.004
Day 9 of 20 · ready Nov 2
Medals
Software I wrote for it
- openbrew-playgroundRecipe editor that solves malt, hop and water targets.
- brewfather-mcpLets an AI assistant read my batches.
- refractometer-readerReads a refractometer scale from a photo.
- ibt-exporterThermometer readings into Prometheus.
- brewfather-fermentation-notificationBrewfather fermentation notifications via ntfy.
- tubing-oxygen-permeability-calculatorEstimates oxygen ingress through beer lines.
Projects
Most of these started because I needed them.
A reselling platform for game servers. Local HTTP caching cuts install times, deduplicating filesystems pack more servers per node, and servers migrate between nodes with minimal downtime.
- Game servers
A browser-based cache simulator for computer architecture classes, with Valgrind-based tooling to trace real programs as input. Published as CacheLab at IEEE Frontiers in Education 2025.
- Low-level
Report handling for Counter-Strike servers. When a player is reported, the match demo is downloaded, rendered to video and attached to the report, so admins review footage instead of guessing.
- Counter-Strike
- cs2-radar-matching
Aligns CS2 radar images using homography.
- Counter-Strike
- Computer vision
- csgo-pipeline
Event ingestion for CS:GO servers over UDP and Redis.
- Counter-Strike
- vip-admin-2
Subscriptions synced to every server.
- Counter-Strike
- payment-system
One billing API for MercadoPago, PayPal and in-game items.
- Counter-Strike
- csgo-sessions
Player session statistics for CS:GO servers.
- Counter-Strike
- fps-booster
SourceMod plugin that mutes distant gunfire for higher FPS.
- Counter-Strike
- aws-gaming
Self-hosted game server control plane on ECS.
- Game servers
- Cloud
- aws-spot-gaming
Game servers on EC2 spot instances with AWS CDK.
- Game servers
- Cloud
- minecraft-aws-server-control-panel-frontend
On-demand Minecraft servers with a small control panel.
- Minecraft
- Cloud
- minecraft-autoreplanter
Spigot plugin that replants crops as you harvest.
- Minecraft
- minecraft-itemsorter
Sorts chests using item frames and signs.
- Minecraft
- twitch-clip-downloader
Backs up every clip of a channel, with metadata.
- Twitch
- twitch-game-predictor
Guesses the game on stream from video frames.
- Twitch
- Computer vision
- surfExtractor
SURF features from microscope images, for WEKA.
- Computer vision
- polenDetector
Segments pollen grains in raw microscope images.
- Computer vision
- tomasulo-simulator
Step-by-step Tomasulo algorithm in the browser.
- Low-level
- chip-8
Tiny CHIP-8 emulator that decodes with regular expressions.
- Low-level
- firefly-cli
gh-style command line for Firefly III finances.
- Home
- drawer-planner
Plans Gridfinity bins for a drawer.
- Home
- cloudex-usage
Claude Code and Codex limits in the GNOME panel.
- Home
- brejas
Tap list for friends, read from Brewfather.
- Brewing
- Private repo
- openbrew-playground
Recipe editor that solves malt, hop and water targets.
- Brewing
- Private repo
- brewfather-mcp
Lets an AI assistant read my batches.
- Brewing
- Private repo
- refractometer-reader
Reads a refractometer scale from a photo.
- Brewing
- Computer vision
- ibt-exporter
Thermometer readings into Prometheus.
- Brewing
- brewfather-fermentation-notification
Brewfather fermentation notifications via ntfy.
- Brewing
- tubing-oxygen-permeability-calculator
Estimates oxygen ingress through beer lines.
- Brewing
Stack
What I reach for most.
TypeScript
React
Next.js
Tailwind CSS
PHP
Laravel
AWS
Terraform
Docker
PostgreSQL
Redis
Python
Work
Software Engineer
at CESAR
2022 – now
Fullstack development on client projects, with Ember.js and Ruby on Rails, and React and Java.
Fullstack Developer
at Tokenlab · started as intern
2021 – 2022
Frontend in Angular and React, backend in NestJS and Serverless, and the AWS infrastructure for internal projects.
Fullstack & Infrastructure Engineer
Independent
2017 – 2021
Ran a network of public Counter-Strike: Global Offensive servers end to end: three bare-metal machines, the software around them, payments, player support and finances.
What I built and ran
Education
- B.Eng. Computer Engineering · UFMS
Extension project: built the ordering and logistics system for Mercado Escola.
- Computer Engineering · UCDB
Undergraduate research scholarship (PIBIC) in computer vision. Transferred to UFMS.
Papers
- CacheLab: Enhancing Memory Hierarchy Learning Through Interactive Exploration
Hugo Jeller Ferreira, Vinícius Shinohara, Gregório Koslinksi, Liana Duenha
IEEE Frontiers in Education Conference (FIE), 2025
- Histogramas de Palavras Visuais com Atributos de Cor, Forma e Textura para Contagem de Polens
Hugo Jeller Ferreira, Hemerson Pistori
Undergraduate research (PIBIC), UCDB, 2014