Open to opportunities · remote or relocation

Matheus Nunes Pereira

Software Engineer. From firmware to backend, from interface to app.

At Monaco.gg I build the backend and real-time fraud detection engine for carrier-billed gaming platforms across Brazilian telecom operators (Claro, Vivo, TIM). I like real-time and concurrency problems: queues, telemetry, binary protocols and hardware talking to software. I deliver end to end, from services in .NET, Go or Rust to interfaces in React or Flutter.

C# / .NETGoRust / C++TypeScriptAWS

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What I do

End-to-end software, from hardware to screen.

Embedded

Software that talks to hardware: weigh-in-motion and inductive-loop sensors over TCP and serial, with binary protocols that survive device drops.

C++20 · Qt6 · Dear ImGui · Boost.ASIO · STM32 / ESP32

Backend

Event-driven services with DDD and CQRS, queues and messaging to process fraud, quotas and telemetry in real time.

.NET 8 · Go · Python (FastAPI) · NestJS · AWS SQS/SNS

Frontend

Real-time telemetry dashboards and high-performance interfaces, using WebSockets instead of polling and WebAssembly modules.

React · SvelteKit · TypeScript · SignalR · WASM

Mobile

Offline-first apps in Flutter and React Native, with native FFI modules crunching data without dropping 60/120 fps.

Flutter · React Native · SQLite · flutter_rust_bridge

Web

High-traffic portals and WebViews distributed at scale through telecom operators, focused on SEO, Core Web Vitals and stability.

Next.js · Vue · AWS CloudFront · GTM

after hours

Games — the sidequest

A hobby: I build, study and play them. This is where the site gets its name.

C++20 · Vulkan · PS2 recompilation

Experience

Where I've been

Full CV (PDF) →

Aug 2025 — present
Software Engineer / Product Builder · Monaco.gg
I build the core backend and real-time fraud detection engine for carrier-billed gaming platforms (Claro, Vivo, TIM), with async AWS SQS/SNS worker queues and MongoDB replicas kept stable under traffic bursts.
Go · Python (FastAPI) · Next.js · SvelteKit · AWS (SQS, SNS, ECS) · MongoDB
2024 — present
Software Engineer (ongoing freelance) · Techmobi Tecnologia
Eliminated race conditions in the weigh-in-motion sensor diagnostics software (Qt6/C++20), reaching 100% field stability, and modeled 40+ domain entities in .NET 8 with DDD and CQRS.
C++20 · Qt6 · Boost.ASIO · Rust · Flutter · .NET 8 · NestJS · SignalR
Feb 2022 — Aug 2025
Full Stack / Frontend Software Engineer · Pinó
Led frontend development for enterprise portals and high-traffic apps in React, Next.js and Vue, and built React Native and Flutter apps backed by Node.js APIs on AWS.
React · Next.js · Vue · React Native · Flutter · Node.js · MySQL
2023 — 2025
Backend & Mobile Developer (freelance) · Runking
Built an offline-first sync engine (SQLite + Rust FFI) that guaranteed zero data loss during live marathons on unstable cellular networks.
Flutter · SQLite · Rust FFI · OpenTelemetry

Full CV (PDF) →

Projects

Case studies

all projects →

FEATURED · EMBEDDED

Simulator & Relay

Problem: Build and test the weighing software without depending on the physical sensors installed on the highway.
My role: Designed and built the simulator, the TCP relay and the bridge to the interface.
Key decision: Rust + Tokio to orchestrate 8+ concurrent TCP listeners, with zero-copy FFI bindings to the Flutter UI.
Result: Inductive-loop protocols emulated, 92 test cases and 1000 Hz streaming.

MOBILE

Conta Certa

Shopping list with a real-time calculator and spending cap, 100% offline: Flutter UI and a Rust core with SQLite via flutter_rust_bridge.

TOOLING / CLI

cpp-gen

Open-source Go CLI that scaffolds modern C++ projects: CMake presets, vcpkg or FetchContent, Clangd and VS Code, CLion or Neovim configs. Shipped via Homebrew and AUR.

GAMES · SIDEQUEST

Saint Seiya: The Hades — native port

Static recompilation of a PS2 game to native Linux: all 13,855 executable functions translated from MIPS R5900 to C, a Vulkan renderer and the original sound driver running on an emulated SPU2.

all projects →

My day to day

What a typical day looks like

morningBackend and anti-fraud at Monaco.ggAWS queues, real-time fraud detection and infrastructure.
afternoonWeighing systems at Techmobi (ongoing freelance)C++ and Rust talking to highway sensors, simulators and telemetry dashboards.
eveningPersonal projects, study and gamesMy Vulkan engine, the Saint Seiya PC port and my Computer Science degree.

Blog

Wins, mistakes and ideas

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Let's talk?

Open to remote roles or relocation, freelance work and collaborations in backend, systems and mobile.

contato@sidequest-lab.dev LinkedIn