SYSTEM PROGRAMMER — FULL-STACK DEVELOPER
I keep enterprise ERP systems running in ADVPL and Microsoft SQL Server, and extend them into Next.js, Angular and Kotlin applications people actually enjoy using.
I'm a system programmer at Multitecnica Industrial, where most of the codebase predates me by twenty years and none of the SLAs care about that. My job is making legacy ERP logic and modern web tooling agree on the same source of truth — customizing TOTVS Protheus in ADVPL on one side, and shipping Next.js, Angular and NestJS applications on the other.
Before that, at Alghorit Tecnologia, I worked across native Android with Kotlin and Jetpack Compose, cross-platform mobile, and real-time backend systems — including a custom SFU server for an industrial field-communication platform. I care about the same thing in every stack: does the interface tell the truth about what the system is actually doing.
Education
B.Sc. in Computer Science — UNA University Center
Feb 2022 – Dec 2025 · Algorithms & Data Structures, Optimization, Computer Theory, Complexity Analysis, Operating Systems, Programming Languages, Software Engineering, AI.
Sep 2025 — PresentCurrent
Multitecnica Industrial S.A
Enterprise software for ERP customization, process automation and systems integration.
Build and maintain TOTVS Protheus customizations in ADVPL — reports, business rules, integrations and automated workflows. Optimize SQL Server queries and ship internal web apps in Next.js, Angular and NestJS that extend the ERP into the browser.
Oct 2024 — Sep 2025
Alghorit Tecnologia Ltda
Web, backend and mobile applications for enterprise clients.
Built and maintained applications in Angular, TypeScript, NestJS, Kotlin and Jetpack Compose — shipping features, integrating REST APIs and improving performance across the stack.
Apr 2023 — Oct 2024
Alghorit Tecnologia Ltda
Native Android applications focused on modern, user-friendly mobile experiences.
Developed and maintained Kotlin + Jetpack Compose apps with SQLite persistence, working in an Agile team through feature builds, bug fixes and REST API integration.
Apr 2022 — Dec 2022
Intersete Telecom
Technical support and network infrastructure for residential and business customers.
Diagnosed connectivity issues over remote support and configured fiber and wireless network equipment — the ground floor for a career built on making infrastructure reliable.
Production landing page for a clothing store, built in Next.js. Pulls the latest Instagram posts live via the Instagram Graph API and real customer reviews via the Google Places API, cutting manual content upkeep to zero.
Real-time monitoring dashboard for laboratory shifts, running on wall-mounted TVs. Auto-scrolling queues, visual indicators and audible alerts flag newly received samples the moment they land.
Cross-platform client app shipped to both the App Store and Google Play. Built and maintained new features, fixes and performance improvements across a single Ionic + Angular codebase.
Industrial communication platform for field operations — real-time messaging, digital checklists and radio comms over a custom SFU (Selective Forwarding Unit) server.
Languages
Frontend
Backend
ERP & Enterprise
Data
Real-Time
Tools & Practice
Portuguese
Native
English
Professional working proficiency
OPEN TO NEW OPPORTUNITIES
© 2026 Marconi Maciel Guimaraes Junior.
Built with Next.js & Tailwind CSS.