Hire Top Freelance
Web Developers
in Barcelona

👋 Hi there, I’m a senior software engineer with over +8 years of experience. I can help you write cleaner code, focus on design patterns, and follow best practices to get quality results fast. I particularly enjoy discussing: * TypeScript * JavaScript * Node * React * GraphQL * NextJS, Astro and Gatsby * Twig * CSS/SCSS * WordPress I’ve been praised for going the extra mile and take pride in delivering neat code that is optimized for maximum readability and scalability. I live for the expression of someone who's been struggling with an issue for hours until the solution finally clicks. I'm a big fan of open source and teamwork. That's why I work on open platforms like [Netlify][1] for my side projects and I offer discounted fees for students who are just starting out. My passions, besides programming, are playing the guitar, playing football and training for my next marathon. 💰 Money-back guaranteed: just let me know if you're not happy with the session and your money stays with you. [1]: https://github.com/netlify/netlify-cms/pull/3412

WebNext.jsMobile App DevelopmentAstro.jsHTML/CSSJavaScriptTypeScriptGraphQLHTML5CSSFlutterDartWebpackiOSAndroidLeadershipNode.jsjQueryGitWordPressSymfonyWeb DevelopmentPHPReactMentoringInterview PreparationGatsby

I've been coding professionally for 15 years, the last 5 as a cofounder and director of a team of engineers that grew from 2 to 15+ people. I am passionate about programming and enjoy helping other developers, both junior and senior, improve their skills. I have mentored developers that now work at places like Google or Tesla. My experience range is full stack, with a preference for Python, C++ and JavaScript, but I have used many other technologies too. I have a PhD in Bioinformatics, and two degrees in Mathematics and Computer Science. Algorithms, math, competitive programming and biomedicine are other passions of mine, and I'd be glad to help you in those fields too.

WebBioinformaticsGo (Golang)Interview PreparationSystem DesignProblem solving skillsData ScienceData structureComputer ScienceCompetitive ProgrammingEntrepreneurshipSoftware DesignSoftware ArchitectureVue.jsHaskellAlgorithmLinuxBashKubernetesCDockerRustJavaScriptMachine LearningFull StackC++DjangoPython

I deliver high-quality software with **Node.js, Nest.js, React, Next.js, JavaScript & TypeScript, PHP, ElasticSearch, MySQL**, and more. Also have experience with performance hacks, payment systems, microfrontends, PWAs, integrations, system design & DDD. 💡 Discover more about my professional journey and contributions: [https://kalabro.tech/](https://kalabro.tech/)

WebNestJSNext.jsJavaScriptTestingMonitoringGitSoftware ArchitectureCI/CDPHPReactDrupalElasticsearchNode.js