About Me
Hello, I'm César Leiva, a Chilean living in Portugal.
frontend
backend
database
tools
My Services
I offer comprehensive development services to help bring your ideas to life. From concept to deployment, I've got you covered with cutting-edge technologies and best practices.
Frontend Development
Modern, responsive web applications built with React, Next.js, and TypeScript. Focus on user experience, performance optimization, and clean, maintainable code.
Technologies:
Key Features:
- Responsive Design
- Performance Optimization
- TypeScript Integration
- Modern UI/UX
Backend Development
Scalable server-side applications with Node.js and Express.js. Secure authentication, database design, and API development.
Technologies:
Key Features:
- RESTful APIs
- Database Design
- Authentication & Security
- Scalable Architecture
Full Stack Solutions
End-to-end web application development from database design to deployment. Specialized in TypeScript ecosystem and modern development practices.
Technologies:
Key Features:
- End-to-end Development
- Database Integration
- API Development
- Production Deployment
Database Design
Efficient database modeling and optimization using PostgreSQL, MongoDB, and Prisma ORM. Focus on performance and scalability.
Technologies:
Key Features:
- Schema Design
- Query Optimization
- Data Migration
- Performance Tuning
API Integration
Seamless integration with third-party services including payment systems, cloud storage, communication APIs, and more.
Technologies:
Key Features:
- Payment Integration
- Cloud Services
- Communication APIs
- Custom Integrations
Deployment & DevOps
Production-ready deployment solutions using modern platforms and containerization. Focus on reliability and scalability.
Technologies:
Key Features:
- Production Deployment
- Container Management
- Version Control
- Server Configuration
My Process
Discovery
Understanding your needs, goals, and project requirements through detailed consultation.
Planning
Creating a comprehensive project plan with timelines, milestones, and technical specifications.
Development
Building your solution using best practices, clean code, and regular progress updates.
Delivery
Testing, deployment, and ongoing support to ensure your project succeeds long-term.
Ready to Start Your Project?
Let's discuss your ideas and create something amazing together. I'm here to help you turn your vision into reality.
My Projects
Here are some of the projects I've worked on. Each one represents a unique challenge and learning experience in my development journey.
CO2 Emissions Calculator - CITEVE
Advanced carbon footprint calculation system for industrial emissions with role-based access control, PDF reports with charts, and comprehensive industry-wide emission tracking.
Budget Management System - Home-Tec
Comprehensive budget system with metrics, customizable PDF generation, product placement in modifiable structures (houses/rooms), multi-level user roles for sales teams.
Municipal Agenda - Pegadas Guimarães
Complete activity management system connected to Google Calendar for Guimarães Municipality, featuring team management, requests, external events, and schedule blocking.
File Management SaaS - FlyFiles
SaaS platform for file administration with expirable sharing links, permanent file management with client access, and customizable file structure system per client.
WhatsApp Business Management
Multi-account WhatsApp Business management system using Cloud API for marketing messaging, automated responses, client management, and marketing portfolio administration.
2FA Authenticator Mobile App
Mobile application for two-factor authentication connections, providing secure authentication for various systems and platforms.
Interested in working together? Let's create something amazing!
Trusted by Industry Leaders
I've had the privilege to work with some of the most innovative companies in the tech industry, delivering high-quality solutions and exceeding expectations.
What Clients Say
Excellent work on our CO2 emissions calculator. The system handles complex industrial data with precision and the PDF reports are exactly what we needed.
The budget management system transformed our sales process. The customizable structures and multi-level access control work perfectly for our team.
Our municipal agenda system integrates seamlessly with Google Calendar. The team management features have improved our workflow significantly.
Get In Touch
Ready to bring your ideas to life? Let's discuss your project and create something amazing together. I'm always excited to work on new challenges.