Looking for a job

Miguel Calmater

@miguelcalmater

Senior Mobile & Full Stack Engineer at Speake Brasil who shipped a platform to 1,300+ users and delivered 40+ Flutter apps.

Brazil

Message

At Speake Brasil, I made and implemented every technical decision as the platform grew to 1,300+ users. I built its Java 21 and Spring Boot backend and Next.js, React, and TypeScript web app, and led the engineering team and technical roadmap.

At Cecum, I delivered 40+ Flutter apps for 10+ companies, from Figma UX/UI through release and support. I also designed a modular app architecture and built a business management app with offline-first sync, supported by a Python and FastAPI backend.

Experience

Work history, roles, and key accomplishments

Chief Technology Officer

Speake Brasil

Jul 2025 - Nov 2026 (1 year 4 months)

Owned every technical decision for the platform, growing it to 1,300+ users. Built the platform on Java 21 / Spring Boot 3 backend and Next.js / React / TypeScript web app, integrated payments with Stripe and Apple in-app purchases, and led the engineering team.

Java Spring Boot Next.js React TypeScript PostgreSQL Redis Keycloak Docker Stripe Apple IAP S3 Jenkins OpenTelemetry

Senior Software Engineer

Kinyx Tecnologia

Aug 2024 - Apr 2026 (1 year 8 months)

Built a restaurant management system end to end as the sole developer, covering ordering, payments, and ERP integration. Also built a sales and management app with offline-first sync and designed a reusable component library.

Flutter Dart Mobile Desktop Offline First ERP Integration Component Libraries Atomic Design Design Systems

Software Engineer

Cecum

Jan 2023 - Feb 2026 (3 years 1 month)

Delivered 40+ Flutter apps for 10+ companies, owning every stage from Figma design to release and support. Designed a modular micro-frontend-style architecture and built a business management app with offline-first sync, plus backend in Python (FastAPI).

Flutter Dart Python fastAPI Pydantic Peewee MySQL SQL Server Figma Offline First Web Scraping Micro Frontend Architecture

Software Developer

Supersys Tecnologia

Feb 2021 - Dec 2023 (2 years 10 months)

Full stack developer for internal products, owning analysis, development, testing, and maintenance. Reduced critical production incidents through continuous improvements and adoption of TDD and Clean Code.

Flutter Python Test Driven Development Clean Code