Joan Leon

Co-Founder

Caldes de Malavella, Catalonia, Spain25 yrs 8 mos experience

Highly StableAI Enabled

Key Highlights

Google Developer Expert in Web Technologies
Founder of PerfReviews, enhancing web performance
Recognized leader in the Spanish-speaking web performance community

Stackforce AI infers this person is a Web Performance Specialist with a strong focus on AI-driven solutions in the tech industry.

Contact

Skills

Core Skills

Artificial Intelligence (ai)Product Development

Other Skills

React.jsWeb PerformanceImage OptimizationCSSJavaScriptHTML5SASSCSS3GitGitHubSVGPostCSSWeb DesignHTMLjQuery

About

I help businesses grow through speed by turning site performance into a competitive advantage, higher conversions, and better customer satisfaction. As a Web Performance Consultant at nucliweb, I combine deep expertise in frontend, CSS, and JavaScript with a focus on measurable business impact. I’m a Google Developer Expert in Web Technologies and Cloudinary Ambassador, recognized in the Spanish-speaking community as a reference in web performance. Through consulting, training, and knowledge-sharing at joanleon.dev, I help companies achieve faster, more reliable, and high-performing websites.

Experience

25 yrs 8 mos

Total Experience

4 yrs 4 mos

Average Tenure

Current Experience

Toniagent

AI Product Engineer

Mar 2026 – Present · 2 mos · Barcelona, Catalonia, Spain · Remote

ToniAgent is a virtual agent platform for healthcare centers that automates patient interactions, reduces operational costs, and gives staff back their time.
As an AI Product Engineer, I work across the product to design and ship AI-driven capabilities, from agent workflows and model integrations to client-facing features. I also focus on performance and reliability, optimizing system latency, AI pipelines, and user experience to ensure fast, seamless interactions for both patients and healthcare staff.
I help make integrations with client systems simple, robust, and scalable so ToniAgent can fit naturally into healthcare operations.

Artificial Intelligence (AI)Product Development

Google developers group

Google Developers Group (GDG) Girona Lead Community Organizer

Jul 2025 – Present · 10 mos · Girona, Catalonia, Spain

Perfreviews

Founder and Web Performance Artisan

Mar 2021 – Present · 5 yrs 2 mos · Spain

Adevinta spain

Staff Frontend Engineer

May 2019 – Jul 2025 · 6 yrs 2 mos · Barcelona Area, Spain · Remote

Google developer experts

Google Developer Expert in Web Technologies and Performance

Mar 2019 – Present · 7 yrs 2 mos

Schibsted spain

2 roles

Developer Advocate & Training Manager

Promoted

Jun 2016 – Mar 2019 · 2 yrs 9 mos

Frontend Domain Expert

Apr 2015 – May 2016 · 1 yr 1 mo

Infojobs

Lead UI Developer

Jun 2014 – Apr 2015 · 10 mos · Barcelona

Telefónica i+d

Freelance

Oct 2013 – May 2014 · 7 mos · Barcelona

Escuela it

3 roles

Docente

Sep 2013 – Oct 2013 · 1 mo

Colaboración como docente en Curso de Desarrollo de Aplicaciones en Firefox OS
http://escuela.it/cursos/curso-introductorio-al-desarrollo-de-aplicaciones-en-firefox-os/

Docente

Aug 2013 – Aug 2013 · 0 mo

Colaboración como docente en Curso de Iniciación al desarrollo Web
http://escuela.it/cursos/curso-gratuito-de-iniciacion-al-desarrollo-web/

Docente

Apr 2013 – Apr 2013 · 0 mo

Colaboración como docente en el curso de HTML5 & CSS3
http://escuela.it/cursos/html-css/

Nucliweb.net

Freelance

Mar 2007 – Oct 2013 · 6 yrs 7 mos · Palafrugell

Diseño web, maquetación HTML5+CSS3+Javascript, Responsive Web Design (diseño adaptable), adaptación de sites a smartphones, Flash interactivo, aplicaciones de escritorio sobre Adobe AIR, adaptación de Flash a iPad e iniciandome en Unity3D y soluciones en aplicaciones para smartphones y tablets