Open to side projects & collaborations

Alan
Teixidó.

Software Engineer — Fullstack Backend Frontend Mobile

Backend APIs, React & Next.js frontends, and cross-platform mobile apps — built to production standard. Based in Barcelona.

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Years engineering

Tech stacks

Languages spoken

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Profile

About me

Fullstack software engineer with strong focus on both backend development and frontend — building .NET APIs, React & Next.js interfaces, and React Native mobile apps. I care about the full picture: clean architecture on the server, polished UI on the client, and reliable delivery pipelines in between.

Barcelona, Spain
teixido.alan@gmail.com

Currently building with .NET & React Native at Plain Concepts

Language proficiency

Catalan Native

Spanish Native

English C1 — Advanced

French Basic

Career

Experience

Plain Concepts

2025 — Present

Software Engineer — Fullstack

Remote · Barcelona, Spain

.NET (C#) React Native TypeScript PostgreSQL Azure DevOps Firebase Docker CQRS

Designed scalable REST APIs following CQRS patterns within a Clean Architecture codebase
Built versioned API contracts (v1) backed by integration and end-to-end test coverage
Developed full-featured React Native screens, navigation flows, and reusable component library consumed across iOS and Android
Integrated frontend views with backend APIs through typed service layers, handling auth flows and real-time data updates
Built and maintained Azure DevOps CI/CD pipelines to streamline Android and iOS release workflows
Led migration to Firebase App Distribution with Crashlytics for real-time crash reporting and Analytics for usage insights
Designed and optimized relational schemas using PostgreSQL and Entity Framework Core, focusing on query performance and data integrity

Quantion

Oct 2024 — Mar 2025

Backend Developer (.NET) — Internship

Barcelona, Spain

.NET (C#) REST APIs Azure DevOps Git

Shipped backend features in .NET (C#) within a live production codebase from day one
Built and validated REST API endpoints with automated test coverage to ensure reliability
Refactored legacy code applying Clean Code principles and established architectural patterns
Contributed to iterative delivery cycles within a cross-functional Scrum team

SJAS Summer Camp

Jul — Aug 2024

Camp Counselor

Lucerne, Switzerland

Led international groups in structured outdoor and team-based activities
Strengthened leadership, communication, and cross-cultural teamwork skills

CamperXpress

May — Jul 2022

Sales Representative & Web Developer

Barcelona, Spain

Managed sales pipeline and client support for a growing business
Developed and maintained the company website

Pista Cero Informática

Jun 2021 — Apr 2022

Hardware Technician

Barcelona, Spain

Assembled, repaired, and upgraded computer systems
Assisted with server maintenance and infrastructure support
Provided technical support to end users

Engineering

Selected work

Backend API Systems

Scalable backend APIs built with modern architecture patterns, focused on maintainability, performance, and clean design.

.NET (C#) CQRS REST APIs API Versioning

Designed and implemented structured API architectures
Worked with versioned endpoints and backward compatibility
Applied integration and contract testing for stability

Frontend & Mobile UI

Cross-platform mobile apps and web frontends with a focus on component architecture, responsive design, and smooth UX.

React Native React Vue.js TypeScript CSS3 Expo

Built React Native screens and reusable component libraries for iOS and Android
Developed responsive web interfaces with React and Vue.js
Implemented navigation flows, auth screens, and real-time data views
Integrated frontend layers with REST APIs through typed service layers

Database & System Design

Relational database design and backend architecture with emphasis on scalability, data integrity, and long-term maintainability.

PostgreSQL Entity Framework Core Docker

Designed relational data models for scalable systems
Implemented structured backend data access layers
Improved system architecture for performance and maintainability

Fullstack — UI to Database

End-to-end training management platform: Vue.js frontend, Node.js REST API, and PostgreSQL — designed and built from scratch.

Vue.js HTML5 CSS3 JavaScript Node.js REST API PostgreSQL

Built responsive Vue.js UI with reusable components, routing, and state management
Designed and styled layouts with HTML5 and CSS3 from scratch
Built a Node.js REST API with controllers, middleware, and route structure
Designed relational data models and connected them end-to-end from UI to DB

Stack

Technical skills

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Backend & Architecture

.NET (C#) ASP.NET Core REST APIs CQRS API Versioning Clean Architecture

Frontend

Next.js React Vue.js TypeScript JavaScript HTML5 CSS3 Tailwind CSS

Mobile

React Native Expo Firebase Android iOS

DevOps & Cloud

Azure DevOps Docker Git CI/CD Pipelines

Databases

PostgreSQL Entity Framework Core SQL

Other Languages

Kotlin Python PyInstaller

Monitoring & Analytics

Firebase Analytics Crashlytics App Insights

What's Next

Looking forward

"I want to build systems that don't just execute logic — but that make software genuinely smarter."

I'm especially interested in the intersection between software engineering and AI — exploring how modern backend systems can integrate intelligent capabilities in a reliable and production-ready way. The same engineering principles apply: clean design, testability, and systems that hold up under real-world conditions.

AI & Machine Learning

Understanding ML fundamentals and how to apply them meaningfully within backend systems.

Language Models & APIs

Exploring how language models can be integrated into production APIs in a practical, reliable way.

Intelligent Backend Systems

Designing APIs and services that incorporate AI capabilities without sacrificing reliability.

Data-driven backends

Building systems that process, expose, and act on data in smarter, more adaptive ways.

Continuous learning

Staying sharp through side projects, technical reading, and hands-on experimentation.

Alan
Teixidó.

About me

Experience

Projects

Pokédex App

Crypto Tracker

Minesweeper

AutoTech Demo

BarberStyle BCN

ProTactics