SOFTWARE ENGINEER
I am a Software Engineer building Android, backend and enterprise applications with Kotlin, TypeScript and modern engineering practices. From enterprise ERPs to scalable web and mobile platforms, I focus on creating reliable software that delivers real business impact.
I'm a Software Engineer working across Android, backend and enterprise systems. At Multitecnica Industrial, I build and maintain software around TOTVS Protheus, ADVPL and Microsoft SQL Server while developing modern applications with Next.js, Angular and NestJS. Most of the codebase predates me by twenty years, and none of the SLAs care about that.
Before that, at Alghorit Tecnologia, I built native Android applications with Kotlin and Jetpack Compose, applying Clean Architecture, SOLID and automated testing. I also worked across backend systems and CI/CD, designing GitLab pipelines with Docker, as well as real-time communication systems using a custom WebRTC SFU server for an industrial field-communication platform.
I enjoy working across different layers of a system — from business logic and databases to APIs, mobile interfaces and deployment pipelines. Whatever the stack, I care about building software that is reliable, maintainable and honest 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, business process automation, systems integration and internal web applications.
Extend TOTVS Protheus with custom integrations and ship internal web apps in Next.js, Angular and NestJS. Optimized SQL Server queries for up to an 84% performance gain, and led the company's migration from SVN to Git — setting up the collaboration workflow now used by 15+ developers across internal and partner teams.
Oct 2024 — Sep 2025
Alghorit Tecnologia Ltda
Android, backend and web applications for enterprise clients, delivering scalable software across multiple platforms.
Built scalable Android apps in Kotlin and Jetpack Compose following Clean Architecture and SOLID, plus backend services in NestJS and frontend apps in Angular — all backed by automated tests. Designed GitLab CI/CD pipelines with Docker that cut build times by up to 67%.
Apr 2023 — Oct 2024
Alghorit Tecnologia Ltda
Native Android applications focused on modern, reliable and user-friendly mobile experiences.
Maintained native Android apps and led the migration of legacy XML layouts to Jetpack Compose. Implemented REST APIs and applied dependency injection with Hilt and Koin to improve scalability and maintainability.
Apr 2022 — Dec 2022
Intersete Telecom
Technical support and network infrastructure maintenance for residential and business customers.
Diagnosed and resolved connectivity issues for 20+ customers daily, keeping downtime to a minimum. Configured routers and fiber optic equipment, and supported field technicians on incident resolution.
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. Visual indicators and audible alerts flag newly received samples the moment they land, cutting response times for sample analyses.
Cross-platform client app developed and published 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 and radio features built on a custom WebRTC SFU (Selective Forwarding Unit) server.
Languages
Android
Frontend
Backend
Testing
Database
Architecture & Principles
DevOps & Infrastructure
ERP & Enterprise Systems
Real-Time Communication
Methodologies
Portuguese
Native
English
Upper Intermediate
OPEN TO NEW OPPORTUNITIES
© 2026 Marconi Maciel Guimaraes Junior.
Built with Next.js & Tailwind CSS.