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Leandro LópezLL

Leandro López

FullStack Developer

€300/day
Barcelona, ES
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Leandro

Over 15 years of experience transforming ideas into robust digital applications and solutions. My focus is clear: building scalable systems with impeccable technical SEO and an architecture designed for high performance.

Specializing in:
  • Modern Stack:JavaScript, TypeScript, PHP, Rust.
  • Frameworks & Libraries:Expert in the WordPress ecosystem, Tauri, Lit, Next.js, React, and Astro.
  • Ownership:I actively maintain SaaS and Open Source projects, giving me a 360º view of a product's lifecycle.

What sets me apart?I am passionate about efficiency and extreme performance. Outside of my applications, I dedicate my time toquantitative analysis and the development of investment botsin low-level languages likeC++, Rust, and Python.This facet allows me to apply a logical rigor and resource optimization that I then transfer to every line of code I write for my clients.

"**I truly get involved in projects that require lateral thinking and push me to find solutions where others see limitations.**"
  • Spanish

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Ligrila
    Founder
    SOFTWARE PUBLISHING
    January 2007 - Today (19 years and 5 months)
    Barcelona, Spain
    Ligrilais the brand under which I offer freelance software development services and launch my own digital products.

    Responsibilities:

    • Design, development, and maintenance of mobile, web, and desktop applications for international clients.
    • Deployment and administration of infrastructure on AWS, Google Cloud, Azure, and Cloudflare.
    • Technical leadership and full-stack development of SaaS products, plugins, and open-source tools.

    Featured Projects:

    powCAPTCHA (2025 - Present)– Proof-of-Work based CAPTCHA focused on privacy to prevent spam and bots.

    • Designed a Proof-of-Work system that blocks bots without affecting the user experience.
    • Developed a multilingual signal and content analysis engine to accurately detect threats.
    • Ensured seamless integration using Web Components and full cross-browser compatibility.
    • Scaled infrastructure to support thousands of websites and millions of verifications.
    • Integrated Large Language Models (LLMs) for advanced text analysis and spam prediction.

    StaticSnap (2023 - Present)– Plugin that converts WordPress sites into static sites with dynamic functionality (search, forms).

    • Created in response to client needs for better SEO, faster loading times, and enhanced security.
    • Converts WordPress into a static site while preserving dynamic functionalities like search, forms, and interactivity.
    • Compatible with CI/CD workflows using GitHub, Cloudflare Pages, and other static hosting providers.
    • Enables serverless form handling and search, without relying on third-party services.
    • Designed to be extensible by developers and easy to use for non-technical users.

    Jugada SuperLiga– Mobile app, control panel, and website for the official Argentine Superliga game.
    React.js Typescript Rust AI Web Design
  • Maison
    Senior Frontend Developer
    SOFTWARE PUBLISHING
    January 2021 - Today (5 years and 5 months)
    Nueva York, United States
    • Designed and delivered enterprise-level websites using React, Astro, and WordPress, directly contributing to improved user experience and clients' online presence.
    • Increased deployment efficiency and reliability by designing and implementing CI/CD pipelines, accelerating release cycles and reducing deployment errors by 30%.
    • Managed a scalable and secure cloud infrastructure on AWS (EC2, S3, CloudFront), ensuring high availability for critical applications and optimizing content delivery.
    • Achieved a 40% or greater reduction in page load times through a comprehensive web performance and technical SEO strategy, measurably improving Core Web Vitals and search engine rankings.
    React.js Astro.js Rust Typescript React Native
  • Mocla
    Senior Full-stack Developer
    SOFTWARE PUBLISHING
    April 2017 - January 2021 (3 years and 9 months)
    Buenos Aires, Argentina
    • Led the development of web and mobile applications for large companies such as Nokia and HP.
    • Collaborated with multidisciplinary teams distributed globally.
    • Led the entire process in the creation of popular applications.
    React Native React.js Python Typescript Next.js

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Education

  • Systems Analyst
    UADER
    Analista en Sistemas Informáticos

Skill set

Categories