Software Engineer

Samuel Leiton Navarrete

Software Engineer · Backend · Full-Stack · AI Developer

Costa Rica Remote

Email
samuel.leiton.n@gmail.com

GitHub
github.com/samleinav

Website
samleinav.github.io

Ver versión en español

Professional Summary

Software Engineer with 6+ years of professional experience (2019-2026) working as an independent developer, focused on backend systems, SaaS platforms, APIs, and AI-powered solutions. Strong background in scalable architectures, modular systems, AI agents, RAG pipelines, and business-critical applications used in real production environments.

Professional Experience

Freelance Software Engineer (Backend / Full-Stack / AI)

2019 - Present

Design, development, and maintenance of complex web systems with a strong emphasis on backend architecture, business logic, and integrations.

Key Responsibilities

  • • Design and development of REST APIs
  • • SaaS multi-tenant architectures
  • • Full-stack development with backend focus
  • • Integration of AI, agents, and RAG systems
  • • Automation of critical business processes and reporting

Selected Projects

Educational Enrollment Systems (MEP)

  • • Web-based student enrollment platforms
  • • Insurance policy (INS) verification
  • • Generation of official reports and PDF documents
  • • Academic period, grade, group, and enrollment state management
  • • Support for real administrative and regulatory workflows

AI Agents and RAG Chat Systems

  • • Development of conversational AI agents
  • • Implementation of Retrieval-Augmented Generation (RAG)
  • • Semantic search, embeddings, and context management
  • • API-based integration with internal systems

SaaS Platforms

  • • Design and implementation of scalable SaaS products
  • • Modular and extensible architecture
  • • User management, permissions, and multi-tenancy
  • • External integrations and automation

SkitSaaS - Modular SaaS Application Platform

  • • Modular SaaS platform built with Next.js
  • • Reusable and extensible architecture
  • • API-driven backend
  • • Foundation for customized SaaS products

Technical Skills

Languages

C#, TypeScript, JavaScript, PHP

Backend

.NET / ASP.NET, Laravel, Node.js, Express

Frontend

Next.js, HTML / CSS, Tailwind CSS

Databases

MySQL, PostgreSQL, SQL Server, MongoDB

AI and Automation

AI Agents, RAG, MCP, model integration and pipelines

Infrastructure and Development

REST APIs, SaaS multi-tenant systems, Docker, Git, Linux

Industries

  • • Education systems and administration
  • • SaaS platforms
  • • Business automation
  • • Applied AI and intelligent agents

Languages

  • • Spanish: Native
  • • English: Basic