Thiago Cerqueira · Teagar Company
Custom software built to survive production.
I'm Thiago Cerqueira, also known as Teagar. At Teagar Company I design and build web systems, integrations and AI-powered automation for businesses ready to replace spreadsheets, rework and manual processes with reliable software.
Open for new projectsFeira de Santana, Brazil · working 100% remotely
- 100+
- public repositories on GitHub
- 2,200+
- contributions in the last 12 months
- 3
- in-house products in development
What Teagar Company delivers
From diagnosis to deployment. Every delivery has a scope, acceptance criteria and evidence — not just a pretty screen.
Custom software
Web systems, internal portals and dashboards shaped around how your team actually works, with permissions, audit trails and clean data.
- Web systems and portals
- Dashboards and reports
- Multi-tenant and RBAC
Process automation
Repetitive work, gone: data entry, reconciliations, notifications and reports that today depend on someone copying and pasting.
- n8n and Make workflows
- Webhooks and queues
- Scheduled jobs
Integrations and APIs
Connecting ERPs, CRMs, payment providers, messaging and spreadsheets — with error handling, idempotency and logs.
- REST APIs
- ERP, CRM and payments
- Data synchronization
Applied AI and agents
Assistants, MCP servers and multi-agent workflows wired into your systems, with clear limits on cost, access and privacy.
- MCP servers
- Agents and orchestration
- LLM integration
Websites and digital presence
Company sites, landing pages and showcases that are fast, accessible and bilingual, ready for search and for conversion.
- Landing pages
- Technical SEO
- WCAG AA accessibility
Technical consulting
Bottleneck mapping, architecture reviews and an evolution plan for teams and companies that already run software.
- Technical assessment
- Architecture and infra
- Evolution roadmap
Selected work
Teagar Company's own products, systems in development and open-source projects. Some code is private; the thinking is here.
- In development
- Live
- Open source
-
Gartrol
A local-first control plane for human and multi-agent work. Cards act as contracts (what, why and how to confirm), with claims, leases, evidence, auditable costs and model routing by complexity. This site was planned and delivered inside it.
- TypeScript
- MCP
- API
- CLI
Private code
-
Teagarden
A desktop environment for multi-agent development: workspaces, paned terminals, missions and orchestration of coding agents, with session persistence and restore.
- Rust
- Desktop
- Terminals
- Agents
Private code
-
Egogero Condominium
Pedestrian and vehicle access control for residential buildings through single-use, time-boxed invitations. Multi-tenant, role-based access (provider, manager, resident, front desk), OIDC with PKCE, MFA, outbox and immutable audit log.
- TypeScript
- Fastify
- React
- PostgreSQL
-
Teagar showcases
Two showcases built on the Teagar Company design system: an editorial fashion store and a responsive online menu. Static, accessible and published on GitHub Pages.
- HTML
- CSS
- JavaScript
- Design system
-
Crawl Online
A cross-platform mod that adds native online multiplayer to Crawl with a host-authoritative model: every player runs and renders their own copy of the game, kept in sync over the network.
- C#
- Networking
- Modding
-
Craftônica: Robotics Lab
An educational electronics mod for Minecraft: wires, power sources, resistors, LEDs and a multimeter as blocks, backed by a DC circuit solver that is independent from the game engine.
- Java
- Forge
- Simulation
-
Multi-agent tutorials
Two MVPs documented step by step — a ticket dashboard and a service monitor — built by coding agents working in parallel, with cards, tests, screenshots and handoffs.
- TypeScript
- React
- MCP
- Agents
-
Linux tooling
Everyday utilities released as open source: a DaVinci Resolve video converter (on the AUR), a visual GPU profile switcher for Intel/NVIDIA laptops and a safe disk-space cleaner for Arch Linux.
- Shell
- Python
- Arch Linux
-
Systems Programming track
Open teaching material with 21 modules: logic, PHP, MySQL, HTML/CSS, JavaScript, REST APIs, MVC and Laravel. Each module has 20 progressive exercises, a capstone challenge and an answer key on a separate branch.
- PHP
- MySQL
- JavaScript
- Laravel
Open-source contributions
My code, reviewed and merged by maintainers of other people's projects.
A Wayland desktop shell with about 12k GitHub stars. Two of my plugins are part of its official community plugin repository.
-
OmniRoute Quota
A bar widget and panel showing the remaining quota of every account configured in OmniRoute, with reset countdowns and seven-day local usage. The collector reads storage read-only and never exposes tokens to the UI.
- Luau
- JavaScript
- Node.js
- SQLite
-
Niri Workspace Preview
An interactive widget that draws proportional maps of every Niri workspace from IPC metadata alone, preserving column and stack geometry, with per-monitor scoping.
- Luau
- Niri IPC
How a project moves
No black box. You always know what is being built, why, and how to confirm it is done.
Diagnosis
A conversation to understand the process, the bottleneck and what success means for your business.
Proposal
Fixed scope, timeline, investment and written acceptance criteria — before a single line of code.
Build
Short, verifiable deliveries with demos, tests and a record of every decision.
Operate
Deployment, monitoring, documentation and support so the system keeps standing after handoff.
Software engineer, founder and teacher
My focus is back-end, real-time systems and applied AI.
I'm Thiago Cerqueira — Teagar online. I've been publishing open-source code since 2021 and turned that work into Teagar Company, a technology company focused on custom software, integrations and automation for businesses in Feira de Santana, across Bahia and anywhere remotely.
Today I build tools that coordinate coding agents with the same rigor as a human team: clear contracts, delivery evidence and costs under control.
I also teach. I maintain an open Systems Programming track and believe that explaining well is part of building well.
- Based in
- Feira de Santana, Brazil
- Engagement
- 100% remote, Brazil and abroad
- Languages
- Portuguese and English
- Focus
- Back-end, real-time, applied AI
Tools of the trade
Languages
- TypeScript
- JavaScript
- Python
- PHP
- C#
- Rust
- Java
- Lua
- SQL
- Bash
Back-end and data
- Node.js
- Fastify
- Laravel
- ASP.NET Core
- FastAPI
- PostgreSQL
- MySQL
- SQLite
Front-end
- React
- Next.js
- Vite
- Semantic HTML
- Modern CSS
Infra and automation
- Docker
- Caddy
- Linux
- GitHub Actions
- n8n
- Make
- Webhooks
AI
- MCP
- Coding agents
- OpenAI-compatible APIs
- Claude
Grab a cup of tea and let's talk about your project.
Got a stuck process? Let's unblock it.
Tell me in a few lines what you need. The form opens your email client with the message ready — nothing is stored on this site.
Or write directly to
contato@teagar.com.br