Portrait of Omar Garcia Rios

Omar Garcia Rios

Full Stack Software Engineer

Barcelona, Spain
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I’m a full-stack engineer in Barcelona with 7+ years of professional experience building web platforms, backend services, and mobile apps. At Prototyp I’ve built products for clients in fundraising, education, finance, and applied AI.

I’m especially drawn to backend engineering and complex integrations, with a close eye for the interface people actually use.

Education

Bachelor's Degree in Informatics Engineering

2015 – 2019
Software Engineering Specialization
Universitat Politècnica de Catalunya (UPC) · Barcelona, Spain

Languages

Spanish
Native
Catalan
Full Professional Proficiency
English
Professional Working Proficiency

Technical expertise

Backend & Systems
  • Ruby on Rails
  • Node.js / Express / NestJS
  • Elixir & Phoenix
  • C# / Microsoft .NET
  • Python (Django, Flask, FastAPI)
Frontend & Mobile
  • React / Next.js
  • Flutter & Dart
  • React Native
  • Vue.js / Nuxt
  • TypeScript & JavaScript
Cloud, Data & DevOps
  • PostgreSQL
  • Firebase / Firestore
  • AWS Cloud Services
  • Google Cloud
  • Microsoft Azure
  • Docker & Containerization
Applied AI
  • LLM Integration & Prompt Pipelines
  • Agentic Development (Claude Code, Codex, Copilot), custom skills & rules

Experience & selected work

Full Stack Developer · Prototyp Stockholm AB

August 2019 – Present

Building web platforms, backend services, and mobile applications in cross-functional teams, from concept to production.

Client projects delivered through Prototyp Stockholm AB.

UNICEF — Fundraising & donation platforms

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Full Stack Developer · 3 years

Long-term development of donation platforms connecting fundraising, e-commerce, donor records, and recurring payments.

Integrated the donation platforms with Salesforce for donor records, Saleor for e-commerce, Adyen for payments, and Contentful for content.

Node.js · React.js · TypeScript · Salesforce

Technical details for UNICEF
  • Built and maintained donation and recurring-giving flows across the platform.
  • Developed features across Node.js, React, and TypeScript services hosted on Heroku, with image storage on AWS S3.

Stack: Node.js · React.js · TypeScript · Salesforce · Saleor · Adyen · Contentful CMS · Heroku · AWS S3

PlayWellMinds — Mental health & AI coaching app

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Mobile & AI App Developer

A Flutter app, live on the App Store, supporting youth athletes with mental health resources and AI-assisted coaching.

Built an AI coaching chat that draws on each user’s in-app data and follows the app’s coaching guidelines.

Flutter · Dart · BLoC · Firebase

Technical details for PlayWellMinds
  • Added AI-generated reports, using the Vercel AI SDK with Claude and Gemini models for both chat and reports.
  • Built the Flutter interface with real-time synchronization through Firestore.

Stack: Flutter · Dart · BLoC · Firebase · Google Cloud · TypeScript · Vercel AI SDK · Claude · Gemini · Contentful CMS

Gapminder — World development education

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Full Stack Developer

An interactive web learning tool that helps people test their understanding of world development.

Helped build the quiz engine, the Elixir/Phoenix backend API, and the Vue.js frontend.

Elixir · Phoenix Framework · Vue.js · Nuxt

Technical details for Gapminder
  • Worked on the Contentful integration that lets editors update quiz content without code changes.

Stack: Elixir · Phoenix Framework · Vue.js · Nuxt · Contentful CMS · Tailwind CSS · PostgreSQL

More client work

Handelsbanken Marknadsinformation — Financial market data

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Full Stack Developer · 2 years

A financial platform for real-time and historical market data, fund indexes, and analysis, built with .NET and Angular.

Technical details for Handelsbanken Marknadsinformation
  • Built financial charts and data tables in Angular for market data and fund information.
  • Developed backend endpoints in C# and .NET running on Microsoft Azure.

Stack: .NET · C# · Angular · Contentful CMS · Microsoft Azure · FTP

Recycla.se — Recycling marketplace

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Full Stack Developer

A Swedish marketplace connecting businesses and consumers with recycling contractors, with live quote matching and bidding.

Technical details for Recycla.se
  • Worked mainly on the back office, built with Phoenix LiveView.
  • Built push notification features and background jobs with Oban.

Stack: Elixir · Phoenix Framework · LiveView · PostgreSQL · Tailwind CSS · Oban

Ireno — Home renovation marketplace

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Full Stack Developer

A home renovation marketplace built with Rails and Hotwire.

Technical details for Ireno
  • Built the main customer flow, including contract generation and an e-signature integration.
  • Developed server-rendered UI with Ruby on Rails, Stimulus.js, Hotwire, and PostgreSQL.
  • Set up reproducible containerized development and deployment workflows using Docker.

Stack: Ruby on Rails · PostgreSQL · Stimulus.js · Hotwire · Docker · Tailwind CSS

Independent projects

Tohab — tasks & habits

Source code

Creator & Full Stack Developer

A mobile task and habit journal that works offline and syncs to a self-hosted backend.

Tohab Today view with scheduled tasks and a habit summary
Tohab quick capture parsing a date, time, priority and project from plain text
Tohab habit detail with streak stats and a 12-week heatmap
Technical details for Tohab — tasks & habits
  • Built an installable SvelteKit app with local data in RxDB and synchronization through Hono and PostgreSQL.
  • Added natural-language task capture, recurring tasks, and habit streaks that account for schedules and pauses.
  • Made every change undoable with an activity history, and added Web Push reminders, a calendar feed, JSON backups, and Todoist import.

Stack: SvelteKit · TypeScript · RxDB · Hono · Drizzle · PostgreSQL · Docker

EBA — headless CMS backups

Creator & Full Stack Developer

A Contentful app that backs up a space’s content and assets on a schedule to the customer’s own Google Drive.

EBA backups page listing encrypted backup files with download and restore actions
EBA backup settings with a daily schedule and automatic cleanup limits
EBA restore dialog previewing an archive and choosing a destination environment
Technical details for EBA — headless CMS backups
  • Built the Contentful app in React with a NestJS API for configuring and restoring backups.
  • Encrypted backups before upload, so customer content never stays on our servers.
  • Ran daily and weekly backups on BullMQ queues, with email alerts and Stripe billing.

Stack: React · TypeScript · NestJS · Prisma · PostgreSQL · Redis · BullMQ · Stripe

Maxims Reminder

Source code

Creator

A personal reminder tool that turns maxims saved in Notion into Telegram reminders and generated wallpapers.

Maxims Reminder wallpaper with the quote: We suffer more often in imagination than in reality.
Technical details for Maxims Reminder
  • Built a Python job that reads the selected maxim from a Notion database, posts it to Telegram, and generates a wallpaper.
  • Scheduled the job to run every two hours with Docker Compose.

Stack: Python · Notion API · Telegram Bot API · Docker Compose · cron

Other automations

Creator · 2023 – 2025

Small self-hosted experiments that bring class availability alerts and voice-note transcriptions to Telegram.

Technical details for Other automations
  • Wrote a Python job that checks a class’s capacity every five minutes and alerts on Telegram when a spot opens.
  • Built a Go bot that transcribes voice notes with Whisper.

Stack: Go · Python · Telegram Bot API · OpenAI API · Docker · cron