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Hi, I’m Guillem Trujillo Ruiz, a passionate full‑stack developer who loves turning ideas into solid, scalable software. I’ve built web and mobile apps across startups and teams, led feature delivery, and embraced a pragmatic DevOps mindset. I’m currently a co‑founder at LightenUp, where we push innovative projects and showcase results at VC events. My main stack includes JavaScript, React, React Native, Terraform, and AWS, and I’m always eager to learn and share new technologies with the team. Over the years I’ve progressed from mobile to full‑stack leadership roles, including Team Lead and project leadership, while collaborating on Android apps with large user bases and complex integrations (BLE/NFC, CI/CD, and cloud deployments). I enjoy mentoring others, solving hard problems, and delivering high‑quality software with a focus on maintainability, performance, and user experience.…Hi, I’m Guillem Trujillo Ruiz, a passionate full‑stack developer who loves turning ideas into solid, scalable software. I’ve built web and mobile apps across startups and teams, led feature delivery, and embraced a pragmatic DevOps mindset. I’m currently a co‑founder at LightenUp, where we push innovative projects and showcase results at VC events. My main stack includes JavaScript, React, React Native, Terraform, and AWS, and I’m always eager to learn and share new technologies with the team. Over the years I’ve progressed from mobile to full‑stack leadership roles, including Team Lead and project leadership, while collaborating on Android apps with large user bases and complex integrations (BLE/NFC, CI/CD, and cloud deployments). I enjoy mentoring others, solving hard problems, and delivering high‑quality software with a focus on maintainability, performance, and user experience.

Guillem Trujillo Ruiz

Full Stack Developer, Web Developer, Front-End Developer, +2

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Hi, I’m Guillem Trujillo Ruiz, a passionate full‑stack developer who loves turning ideas into solid, scalable software. I’ve built web and mobile apps across startups and teams, led feature delivery, and embraced a pragmatic DevOps mindset. I’m currently a co‑founder at LightenUp, where we push innovative projects and showcase results at VC events. My main stack includes JavaScript, React, React Native, Terraform, and AWS, and I’m always eager to learn and share new technologies with the team. Over the years I’ve progressed from mobile to full‑stack leadership roles, including Team Lead and project leadership, while collaborating on Android apps with large user bases and complex integrations (BLE/NFC, CI/CD, and cloud deployments). I enjoy mentoring others, solving hard problems, and delivering high‑quality software with a focus on maintainability, performance, and user experience.…Hi, I’m Guillem Trujillo Ruiz, a passionate full‑stack developer who loves turning ideas into solid, scalable software. I’ve built web and mobile apps across startups and teams, led feature delivery, and embraced a pragmatic DevOps mindset. I’m currently a co‑founder at LightenUp, where we push innovative projects and showcase results at VC events. My main stack includes JavaScript, React, React Native, Terraform, and AWS, and I’m always eager to learn and share new technologies with the team. Over the years I’ve progressed from mobile to full‑stack leadership roles, including Team Lead and project leadership, while collaborating on Android apps with large user bases and complex integrations (BLE/NFC, CI/CD, and cloud deployments). I enjoy mentoring others, solving hard problems, and delivering high‑quality software with a focus on maintainability, performance, and user experience.

Available to hire

Hi, I’m Guillem Trujillo Ruiz, a passionate full‑stack developer who loves turning ideas into solid, scalable software. I’ve built web and mobile apps across startups and teams, led feature delivery, and embraced a pragmatic DevOps mindset. I’m currently a co‑founder at LightenUp, where we push innovative projects and showcase results at VC events. My main stack includes JavaScript, React, React Native, Terraform, and AWS, and I’m always eager to learn and share new technologies with the team.

Over the years I’ve progressed from mobile to full‑stack leadership roles, including Team Lead and project leadership, while collaborating on Android apps with large user bases and complex integrations (BLE/NFC, CI/CD, and cloud deployments). I enjoy mentoring others, solving hard problems, and delivering high‑quality software with a focus on maintainability, performance, and user experience.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Beginner

Language

Spanish; Castilian

Fluent

Catalan; Valencian

Fluent

English

Intermediate

Work Experience

Co-founder at LightingUp

June 1, 2025 - October 26, 2025

Co-founded LightingUp; MVC 25 exhibitor with excellent results.

Ninja Full-Stack Developer (Training) at Ninja Training / Formación Ninja

May 1, 2023 - Present

Completed Ninja Full-Stack Developer training; stack included NextJS, NestJS, Metabase, Bunny, DigitalOcean, PostgreSQL.

Team Lead at Prestalo

May 1, 2023 - October 26, 2025

Started as Full-Stack and advanced to Team Lead; performed data analysis as part of the role.

Full-Stack Developer at Grupo ICA

November 1, 2021 - October 26, 2025

Worked on Android apps, Kotlin (MVVM), Unit Testing, and SOLID; CI/CD using Jenkins, GitLab & Fastlane; printed labels with Zebra devices; BLE read/write communications.

Full-Stack Developer at Qontinuum Plus

April 1, 2019 - October 26, 2025

Maintained Android apps (Q Tag_V, QTag_C); worked with NFC Mifare and DESFire chips.

Team Lead at Computr abajo SL

March 1, 2018 - October 26, 2025

Started as Mobile dev, then Full-Stack and Team Lead/PM; Android apps had 300K+ unique users/day and 4.4 stars on Google Play.

Backend Developer at Dorna Sports

April 1, 2015 - October 26, 2025

Maintenance and improvement of MotoGP website.

Full-Stack Developer at Zitro Lab

April 1, 2015 - October 26, 2025

Internal applications (Web and Android); video game ‘BET’ (Android) and interconnected Bingo across autonomous communities; rooted devices with custom launcher.

Co-founder at LightenUp

June 1, 2025 - October 26, 2025

Co-founded LightenUp; participated as MVC 25 exhibitor with excellent results. Stack: JavaScript, React, React-Native, Terraform and AWS.

Full-Stack Developer at Grupo ICA

November 1, 2021 - October 26, 2025

Developed Android apps; Kotlin with MVVM; Unit Testing; CI/CD using Jenkins, GitLab & Flutter; used Zebra devices to print labels.

Full-Stack Developer at Qontinuum Plus

April 1, 2019 - October 26, 2025

Maintained Android apps (Q Tag_V, QTag_C); interacted with NFC Mifare and DESFire chips.

Backend Developer at Dorna Sports

April 1, 2015 - October 26, 2025

Maintained and improved MotoGP website.

Full-Stack Developer at Zitro Lab

April 1, 2015 - October 26, 2025

Internal applications (Web and Android). Video game ‘BET’ (Android); interconnected Bingo across multiple autonomous communities. Used rooted devices with customized launcher.

Co-founder at LightenUp

June 1, 2025 - June 1, 2025

M VC 25 exhibitor with excellent results. Stack: JS, React, React-Native, Terraform and AWS.

Full-Stack Developer at Freelancer

May 1, 2023 - October 28, 2025

May 2023 – Currently: freelancing as a Full-Stack Developer. Stack includes NextJS, NestJS, Metabase, Bunny, Digital Ocean, PostgreSQL.

Team Lead at Prestalo

May 1, 2023 - May 1, 2023

Started as Full-Stack and then became Team Lead. Also some Data Analysis. Stack: NextJS, NestJS, Kubernetes, Digital Ocean, MySQL.

Full-Stack Developer at Grupo ICA

November 1, 2021 - November 1, 2021

Some Android apps, written in Kotlin using MVVM, Unit Testing and SOLID. CI/CD using Jenkins, GitLab & Fastlane. Used Zebra devices to print labels. Communication with BLE devices (read & write). Stack: .NET Core(2.2), Kotlin, Java, Jenkins.

Full-Stack Developer at Qontinuum Plus

April 1, 2019 - April 1, 2019

Maintenance of the company's Android apps (QTag_V, QTag_C). Interact with NFC MIFARE and DESFire chips. Stack: C#, .Net, Java, SQL Server.

Team Lead at Computr abajo SL

March 1, 2018 - March 1, 2018

Started as Mobile dev, then became Full-Stack and then Team Lead/PM. Android apps had more than 300K unique users/day, and 4.4 stars on Google Play (CompuTrabajo y BestJobs). Stack: Java, Kotlin, C#, .Net, Nagios, SQL Server.

Backend Developer at Dorna Sports

April 1, 2015 - April 1, 2015

Maintenance and improving MotoGP website. Stack: PHP 5.3, MySQL.

Full-Stack Developer at Zitr o Lab

April 1, 2015 - April 1, 2015

Internal applications (Web and Android). Video game ‘BET’ (Android), an interconnected Bingo in multiple autonomous communities. Using rooted devices with custom launcher. Stack: PHP 5.3, MySQL, Java.