Alejandro Trejo
Alejandro Trejo

Frontend Developer

Open to offers · Member since 21 Jul 2026
Message
Location
Tenerife, Spain
Desired salary
Unspecified
Work preference
Remote Only / Full Time, Part Time, Contract, Freelance
Experience level
Mid

About

Professional summary

I am a Frontend Developer with 4+ years of experience building scalable web and mobile applications for distributed teams across Latin America and the US.

I specialize in Angular, React, Ionic, and Capacitor, with strong experience in micro frontends, modular architecture, and state management using NgRx, SignalStore, and Redux.

I have contributed to production systems where performance and maintainability were critical, helping reduce load times by up to 80% and improving Lighthouse scores from 50 to 90.

I also have hands-on experience with UI development using Tailwind CSS, PrimeNG, and Storybook, as well as testing with Karma, Jasmine, Jest, and React Testing Library.

In addition to frontend work, I have built backend foundations with Node.js, NestJS, Prisma, PostgreSQL, JWT, and RBAC for a SaaS product, giving me a strong full-stack perspective.

I am looking to contribute to high-impact frontend roles where architecture, technical quality, testing, and user experience are key to the product.

Skills

32 capabilities

Tech stack & tools

Working toolkit

Application Hosting

Collaboration

Development

Experience

Career history

Founder & Full-Stack Developer RacerLab

Designing and building an automotive workshop management SaaS platform. Defined product and technical foundations through PRD/TRD documentation, ERD, system architecture, and deployment strategy. Built backend foundations with Node.js, NestJS, Prisma, and Supabase PostgreSQL, including schema migrations, health checks, Swagger/OpenAPI documentation, and modular domain boundaries. Implemented authentication and role-based access control with Argon2, JWT, guards, decorators, and protected user-management endpoints.

Frontend Developer Rebel Quest Interactive

Contributed to a 7 micro frontend architecture using Angular and React with Webpack Module Federation. Reduced load times by 50% through modern standards and signals-based reactivity. Built modern UIs with Tailwind CSS and PrimeNG, documented components with Storybook, and supported distributed development using Docker and AI-assisted tools.

Freelance Frontend Consultant (part-time) Digitalmente Studio

Led frontend consulting for a digital agency over 4 years, owning architecture and delivery of multiple client projects across web and mobile platforms. Built a mobile app with Ionic and Angular for condominium visitor management with real-time Firebase push notifications. Used AI-assisted development tools to accelerate delivery and optimize solutions.

Frontend Developer Beartrack

Developed the frontend for a new version of a multi-company logistics product and an app integrated with PrestaShop. Used Angular 18 for modular development focused on performance and scalability.

Frontend Developer CRSoporte

Built web and mobile interfaces for medical staff and merchants using Angular 16/17 and Signals. Centralized state management with NgRx and implemented efficient pagination, reducing load times by 80% and improving Lighthouse performance from 50 to 90 for a logistics app.

Frontend Developer Repsa Logistic

Developed new features for a mobile and web vehicle inspection app. Refactored code and consolidated redundant API calls into optimized single requests, reducing load times by 50%. Integrated Ionic QR reader functionality for inspection order data retrieval.

Education

Learning history

IUTCM

Associate Degree in Computer Science, Computer Science

Associate degree focused on computer science.

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