OG

Omar Garcia

7+ Years Experience

Senior Full Stack Software Engineer

Barcelona, Spain
Contact
Profile & Philosophy

I like to turn complex problems into simple solutions with a continuous curiosity for new tools and services to simplify workflows and elevate the end result. I am especially excited about the application of AI tools in software engineering, embracing them fully yet with sound engineering caution.

Even though colleagues frequently commend my sharp eye for detail and design precision, I feel most energized solving tough challenges in the back-end. I work extensively with Ruby on Rails, Node.js, Elixir, .NET, and Python, complemented by rich cross-platform and modern front-end experience across React, Flutter, Vue, and Angular.

Outside my primary engineering engagements, I actively architect autonomous Telegram bots and custom Python APIs. My core strengths are thoroughness, rapid deep-focus execution, and technical versatility.

7+ Years of Professional Experience
Deep Backend & Distributed Systems Focus
Curated AI Integration & RAG Architectures
Cross-Platform Mobile & Modern Web Mastery
Tech Stack & Core Competencies

Backend & Systems

Ruby on RailsNode.js / Express / NestElixir & PhoenixC# / Microsoft .NETPython (Django, Flask, FastAPI)GraphQL & REST APIsMicroservices & Background Workers (Oban/Sidekiq)

Frontend & Mobile

React / Next.jsFlutter & DartReact NativeVue.js / NuxtAngularTypeScript & JavaScriptTailwind CSSSvelte / SvelteKit

Cloud, Data & DevOps

PostgreSQLMySQLFirebase / FirestoreAWS Cloud ServicesMicrosoft AzureDocker & ContainerizationPrisma ORMContentful CMSShopify / Saleor E-Commerce

AI & Pragmatic Engineering

LLM Integration & Prompt PipelinesRAG (Retrieval-Augmented Generation)AI-assisted Development (Claude Code, Copilot, Roo)Automated Bot Architecture
Professional Experience & Selected Projects

Full Stack Developer

Prototyp Stockholm AB(prototyp.se)
August 2019 – Present
Barcelona, Spain

Key member of cross-functional engineering teams building ambitious enterprise platforms, startups, and mobile applications from concept to production.

Featured Client Engagements & Production Systems

Global NGO Fundraising Eco-System & E-Commerce

Enterprise Web & FinTech
Full Stack Developer•4+ years (ongoing)

Long-term full-stack engineering of high-scale fundraising and donation platforms integrating e-commerce, CRM, and recurring payments for humanitarian operations.

  • Architected and maintained multi-currency donation funnels handling high transactional spikes during emergency campaigns.
  • Engineered seamless CRM and e-commerce integrations synchronizing thousands of donor records securely.
  • Developed cross-stack features using Ruby on Rails, Node.js, React, Elixir, and TypeScript deployed to AWS and Heroku.
Ruby on RailsNode.jsReact.jsElixirTypeScriptAWSHerokuShopify

Youth Sports Mental Health & AI Coaching Mobile App

Mobile & Applied AI
Mobile & AI App Developer

Cross-platform mobile application dedicated to mental health awareness, emotional resilience, and psychological conditioning for youth athletes.

  • Built intelligent conversational interfaces with curated LLM chats adhering to strict safety and privacy standards.
  • Engineered Retrieval-Augmented Generation (RAG) pipelines for contextual mental health resources and AI reporting.
  • Crafted polished, highly engaging UI using Flutter with real-time sync backed by Firestore and Google Cloud.
FlutterDartFirestoreGoogle CloudLLMsRAGAI Workflows

Global Development Educational Platform

Interactive Web & Mobile App
Full Stack Developer

Interactive educational tool empowering global citizens and students to dismantle systematic misconceptions about world development through data testing.

  • Built responsive web and mobile experiences utilizing Elixir/Phoenix backend services with Vue.js.
  • Implemented dynamic content delivery pipelines with Contentful headless CMS for rapid curriculum iteration.
  • Delivered fast, accessible design patterns using Tailwind CSS and Nuxt.
ElixirPhoenix FrameworkVue.jsNuxtContentful CMSTailwind CSSPostgreSQL

Nordic Financial Market Data Platform

Enterprise FinTech
Full Stack Developer

Large-scale enterprise financial web application (10,000+ development hours) delivering real-time and historical financial market intelligence, fund indexes, and analysis.

  • Engineered mission-critical market data visualization and calculation modules complying with strict banking standards.
  • Developed backend micro-endpoints using Microsoft .NET and C# integrated with Azure infrastructure.
  • Built complex financial data tables and interactive charts in Angular backed by Contentful CMS.
.NETC#AngularContentful CMSMicrosoft AzureSQL Server

Circular Economy & Waste Management Platform

SaaS & Marketplace
Full Stack Developer

Sweden’s leading circular marketplace connecting businesses and consumers with sustainable waste management and recycling contractors.

  • Built real-time interactive quote-matching and bidding features using Phoenix LiveView and Elixir OTP.
  • Implemented fault-tolerant async background jobs and dispatch queues using Oban and PostgreSQL.
  • Crafted performant, responsive views styled with Tailwind CSS.
ElixirPhoenix FrameworkLiveViewVue.jsPostgreSQLTailwind CSSOTPOban

B2C Construction & Renovation Marketplace

Startup Marketplace
Full Stack Developer (Lead Sidekick)

Modern digital platform transforming home renovations by connecting residential owners with verified contractors, project scoping, and escrow milestones.

  • Partnered with Tech Lead as the primary hands-on developer to take the platform from initial concept to commercial launch.
  • Developed reactive server-rendered UI using Ruby on Rails, Stimulus.js, Hotwire, and PostgreSQL.
  • Set up reproducible containerized development and deployment workflows using Docker.
Ruby on RailsPostgreSQLStimulus.jsHotwireDockerTailwind CSS
Independent Projects & Tools

Autonomous Telegram Bots & Modular Automation APIs

Independent Engineering
Creator & Backend Architect•Ongoing

Suite of autonomous Telegram bots and standalone microservice APIs built for high availability, task automation, and real-time alert triggers.

  • Designed asynchronous Python APIs using FastAPI and the Telegram Bot API.
  • Implemented automated webhook handlers, rate-limiting safeguards, and resilient persistent scheduling.
  • Packaged and orchestrated services with Docker for lightweight hosting.
PythonFastAPITelegram APIDockerAsyncIOREST APIs
Academic Education

Bachelor's Degree in Informatics Engineering

Barcelona, Spain
Software Engineering Specialization
Universitat Politècnica de Catalunya (UPC)