Sebastian Arrieta Villarreal

Full-Stack Software Engineer

/about

I'm a full-stack software engineer passionate about building elegant, scalable solutions to complex problems. I specialize in modern web technologies, domain-driven architecture, and shipping products that matter. With expertise spanning backend systems, frontend experiences, and cloud infrastructure, I help teams move fast without sacrificing code quality.

Recently, I've led engineering at stealth startups building NFC authentication platforms and fractional property investment systems. I'm particularly interested in clean code, type-safe systems, real-time collaboration, and creating great developer experiences. Relevant coursework includes Object-Oriented Programming, Web Application Development, Database Design, Cybersecurity, Software Architecture, and Algorithms.

/experience

Software Developer

Disruptica

Leading full-stack development across multiple product initiatives

  • HeliFlite: Led helicopter booking platform development, designing backend API, web admin dashboard, and React Native mobile apps across three repositories. Implemented Authorize.Net payment processing with tokenization for secure mobile flows.
  • Fraktion: Built fractional real estate investment MVP using Laravel 12, Inertia.js, and React 19. Designed comprehensive deal wizard managing invitations, document signing, KYC verification, and payment workflows. Implemented real-time collaboration using Laravel Reverb WebSockets.
  • Stealth NFC Authentication Platform: Led team of 3 developers building product owner authentication system using NFC technology. Architected TypeScript monorepo with 1,450+ API files and 640+ components using domain-driven design principles. Led Prisma-to-Drizzle ORM migration improving type safety and performance. Engineered Shopify integration with real-time order sync and storefront API. Designed production GCP infrastructure with Terraform IaC (Cloud Run, Cloud SQL, Memorystore).
  • Monitor: Building full-stack time tracking and contractor management platform (Laravel 13, React 19). Manages contractor timesheets, SOW budgets, time logs, and feedback workflows. Features calendar-based entry, real-time budget tracking, and AI code feedback integration.
  • Ladybug: Developed AI-powered code review feedback tool (Next.js, TypeScript, Claude API). Analyzes code changes and provides actionable feedback. Distributed system with web dashboard, worker process for analysis, and organization management with team invitations.
NestJS · Next.js · React · React Native · Laravel · TypeScript · Drizzle ORM · PostgreSQL · Redis · GCP · Terraform · Shopify API · Authorize.Net · Claude API

Software Engineer Intern

PRAGMA
7 mos
  • Reduced API response times by 98% (10s → 200ms) through performance optimization and caching improvements
  • Improved build times by 95% (10min → 30s), dramatically accelerating development cycles
  • Developed and maintained features for a platform serving 1,000+ monthly active users
  • Migrated serverless functions from AWS Lambda to AWS SAM, streamlining deployment via Azure Pipelines
  • Designed scalable notification delivery workflow using AWS Lambda, API Gateway, SNS, and Firebase Cloud Messaging
React · AWS Lambda · AWS SAM · Azure Pipelines · Firebase · API Gateway · SNS

Software Engineer Intern

Universidad de Cartagena
7 mos
  • Developed web-based booking system improving workflow efficiency for the university's planning department
Laravel · MySQL

Independent Contractor

Freelance
  • Built waste separation app for Colombian Ministry of Environment enabling citizens to categorize and manage recyclable materials
  • Developed school food tracking system for Colombia's PAE program monitoring meal distribution to low-income students
  • Created cadastral property management application for San Pablo enabling government documentation and valuations
  • Built React-based property registry system (Catastro) for municipalities with property search and government workflows
  • Developed Angular-based school food program manager (PaeGOB) with attendance tracking and PDF reporting
React · Angular · TypeScript · Flutter · Firebase · Docker · Azure Pipelines

/speaking

Building Digital Products at Lightspeed: How AI Agents Transformed Our Compliance Implementation

2025

Talk about leveraging AI agents to accelerate digital product development and streamline compliance workflows. Discusses practical approaches to integrating AI agents into product architecture and achieving rapid implementation timelines.

/technical skills

Languages

TypeScript, JavaScript, PHP, Python, Go, SQL

Frontend

React, Next.js, Angular, Astro, React Native, TanStack Query

Backend

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

Databases

PostgreSQL, MySQL, MongoDB, Redis, Prisma, Drizzle ORM

Cloud & Infrastructure

GCP, AWS, Docker, Terraform, GitHub Actions, Azure Pipelines, Firebase

Methodologies

Domain-Driven Design, Test-Driven Development, RESTful APIs, Clean Architecture

/education

University of Cartagena

Bachelor of Computer Engineering

April 2019 — December 2024 · GPA: 4.5/5

Relevant coursework: Object-Oriented Programming, Web Application Development, Database Design, Cybersecurity, Software Architecture Design, Algorithms and Data Structures, Artificial Intelligence

/contact

Email me at sarrietav.dev@gmail.com, connect on LinkedIn, or find my open source work on GitHub.