# Marc Güell Segarra Freelance full-stack developer with over 20 years of experience, including React and React Native. Today I build software with AI coding agents. Location: Valls, Catalonia, CET. Email: marc@ondori.dev. ## Who is behind Ondori.dev? I'm Marc Güell Segarra, a freelance full-stack developer in Valls, Catalonia. I've worked in IT for over 20 years: since 2005, and independently under Ondori.dev since 2017. I used to write code by hand. Now I build everything with AI coding agents. I've done remote work for agencies. I've also worked with large companies and helped small startups. I love mountains, coffee and technology. ## Where have I worked? ### Lya2 Sistemas de Información S.L.: React Native Developer (Nov 2024 - Present) Barcelona, Spain. Since November 2024, I develop and maintain cross-platform mobile apps with React Native at Lya2. I focus on solutions that improve healthcare management for medical professionals. ### GISCE-TI, S.L.: Senior Frontend Developer (Nov 2020 - Present) Girona, Spain. Since November 2020, I create and maintain a modular, dynamic server-driven UI front-end system for the main ERP solution of GISCE-TI. ### Editorial Claret: Full Stack Developer (Apr 2018 - Present) Barcelona, Spain. Since April 2018, I develop a React Native app and its serverless infrastructure on AWS at Editorial Claret. I have also created a few of the company's static websites. ### Ondori.dev: Freelance Full-Stack Developer (Mar 2017 - Present) Valls, Catalonia. Since March 2017, I work as a freelance full-stack developer under Ondori.dev. ### We Agile You, S.L: Frontend Developer (Nov 2024 - Feb 2025) Barcelona, Spain. From November 2024 to February 2025, I was a frontend developer at We Agile You. I worked with React and TypeScript on planningpokeronline.com and other company projects, including JIRA plugins and apps. ### Scopely: Frontend Developer (Jul 2022 - Nov 2024) Los Angeles, California, United States. From July 2022 to November 2024, I was responsible for the front-end of playscrabble.com and its HTML5 game engine at Scopely. ### niikiis: Full Stack Developer (Oct 2020 - Feb 2021) Barcelona, Spain. From October 2020 to February 2021, I worked at niikiis as a React developer and built backend microservices on the AWS stack. ### Human Life Technologies, LLC: React Native Developer (Sep 2020 - Feb 2021) Massachusetts, United States. From September 2020 to February 2021, I created an iOS extension for React Native that gives the company's mobile app Caller ID features linked to their CRM. ### Opentrends: Android Architect and Team Lead (Mar 2017 - Apr 2018) Barcelona, Spain. From March 2017 to April 2018, I led the Android architecture and development team at Opentrends. ### NEXIONA: Front-end Engineer (Jan 2017 - Mar 2017) Barcelona, Spain. From January to March 2017, I was a front-end engineer of MIIMETIQ at NEXIONA. MIIMETIQ is an IoT/M2M framework designed to simplify the creation of bespoke IoT verticals. ### Moddity: Full Stack Developer (Oct 2014 - Feb 2017) Lleida, Spain. From October 2014 to February 2017, I was a full-stack developer at Moddity, part of the VIKO group. I worked on transactional mobile apps and various e-commerce services. ### Tecnocom: Cross-platform Senior Mobility Developer (Jun 2012 - Nov 2014) Tarragona, Spain. From June 2012 to November 2014, I developed mobile applications for a leading Catalan financial institution at Tecnocom. ### Getronics: IBM Mainframe z/OS Analyst Programmer (Jun 2007 - Jun 2012) Tarragona, Spain. From June 2007 to June 2012, I analyzed and developed applications with PL/I and DB2 in a banking HOST environment at Getronics. My tasks included resolving incidents, customer communication, project estimation, documentation and team supervision. ## What technologies do I use? AI Coding Agents, Claude Code, Codex, OpenCode, JavaScript, TypeScript, React, React Native, Next.js, Node.js, AWS, Vite, GitHub Actions, SEO, Styled Components, Tailwind CSS, Mobile Game Development, Supabase, Cloudflare, Lambda, DynamoDB, Cloudformation, Amplify, API Gateway, iOS, Objective-C, Android, Java, CSS, Web, S3, Cognito, MongoDB, Angular.JS, Express, Bootstrap, Cloudfront, Route53, Unity, Maven, Github Pages, Clean architecture, Jenkins, Sonarqube, Dexguard, Cordova, Ionic, Swift, Three.js, Raycast, Developer Tools. ## What have I built? ### Mulassa Tap Tap Dance (2026) Mulassa Tap Tap Dance (2026) is a free rhythm game in Catalan. You dance the Mulassa de Valls to the beat, tap GUA and PA, beat the challenge and share your dance. Link: https://mulassa.cat/projecte/ Technologies: Three.js, Vite, Supabase, Cloudflare, Mobile Game Development. ### Campanar de Valls LEGO (2026) Campanar de Valls LEGO (2026) is an interactive 3D model of the bell tower and church of Sant Joan de Valls, built with LEGO bricks. It has an assembly animation and export options. Link: https://github.com/mguellsegarra/campanar-de-valls-lego Technologies: TypeScript, Three.js, LDraw, 3D, Open Source. ### Menu Bar Icon Search (2026) Menu Bar Icon Search (2026) is a Raycast extension that finds and opens macOS menu bar icons, including the hidden ones. Link: https://github.com/mguellsegarra/menu-bar-icon-search Technologies: Raycast, Swift, macOS, Productivity Tools. ### CPU Load Bar (2026) CPU Load Bar (2026) is a macOS menu bar app that always shows the CPU load and the memory pressure. Link: https://github.com/mguellsegarra/cpu-load-bar-mac Technologies: Swift, macOS, Menu Bar, System Monitoring. ### Yami – Bookmark Launcher (2025) Yami (2025) is a Chrome extension that opens your bookmarks with a keyboard shortcut. It has no tracking and is open source under the MIT license. Link: https://chromewebstore.google.com/detail/jnalohicjcjdgkbahjgobeadljgmlpba Technologies: Chrome Extensions, JavaScript, HTML, CSS, Open Source, Keyboard Shortcuts, Productivity Tools. ### Activity Tracker for Mac (2024) Activity Tracker for Mac (2024) is a system tray app, built with Go, that tracks your computer activity. I made it as an alternative to macOS Screen Time. Link: https://github.com/mguellsegarra/activity-tracker-mac Technologies: Go, macOS, System Tray, Launch Agents, Activity Monitoring, Open Source, Productivity Tools. ### Highlight on Copy (2024) Highlight on Copy (2024) is a Visual Studio Code extension that briefly highlights the text you copy, so every copy gives visual feedback. Link: https://marketplace.visualstudio.com/items?itemName=mguellsegarra.highlight-on-copy Technologies: Visual Studio Code, Extension Development, JavaScript, Text Editing, Developer Tools. ### Playscrabble.com (2023) Playscrabble.com (2023) is an online Scrabble platform. I built reusable React components and libraries, drag-and-drop tile placement and sound effects, and optimized it for search engines. I used Vite for development and Next.js. Link: https://playscrabble.com Technologies: React, Vite, Next.js, GitHub Actions, SEO, TypeScript, Styled Components, Tailwind CSS. ### Kotobayama (2020) Kotobayama (2020) is an open-source word game built with React Native. You guess words while climbing a mountain. Link: https://github.com/mguellsegarra/kotobayama Technologies: React Native, JavaScript, Mobile Game Development, Word Game, GitHub. ### Niikiis (2020) Niikiis (2020) is HR management software for small businesses and companies. I worked on the full stack. Link: https://www.niikiis.com/ Technologies: AWS, Lambda, DynamoDB, Cloudformation, Amplify, API Gateway, Javascript, React. ### BetterLivingPRO (2020) BetterLivingPRO (2020) is the CRM app of a US real estate agency. I developed a React Native module for Android and iOS that adds caller ID features. Link: https://www.betterlivingre.net/ Technologies: iOS, Objective-C, Android, Java, React Native, Javascript. ### Ringotap (2019) Ringotap (2019) is a minimal pixel art game made with Unity. You tap red apples as fast as you can before they explode, which trains your reflexes. Link: https://play.google.com/store/apps/details?id=games.ondori.ringotap Technologies: Unity, Game. ### Missa de Cada Dia - App (2018) Missa de Cada Dia (2018) is a React Native app for Android and iOS. It is a reader for the daily mass, based on geolocation and language, with a subscription model. It ranked #1 in its category in Spain. Link: https://play.google.com/store/apps/details?id=cat.claret.missadecadadia Technologies: Javascript, React Native, iOS, Android, Objective-C, Java, S3, AWS, Lambda, Amplify, Cognito, DynamoDB, MongoDB, Angular, Express. ### Missa de Cada Dia - Web (2018) This is the 2018 website of the Missa de Cada Dia mobile app. It has a mass web reader, help and contact pages. Link: https://www.missadecadadia.cat Technologies: Web, Javascript, Bootstrap, CSS, React, S3, AWS, Cloudfront, Lambda, DynamoDB, API Gateway, Route53, MongoDB, Angular, Express. ### Lawliet (2017) Lawliet (2017) is a Node.js tool that finds broken links in your documentation files. Link: https://github.com/mguellsegarra/lawliet Technologies: Javascript, Node.js. ### Myopic (2017) Myopic (2017) is an Android library that replaces the app switcher thumbnail with a blur or a custom image overlay. Link: https://github.com/mguellsegarra/myopic-app-switcher Technologies: Android, Java, Maven. ### Caixabank (2017) Worked as a solution analyst for CaixaBank's mobility architecture SDK for Android platform. The SDK is used in the top #1 banking app in Spanish markets. Security auditor (APK reverse engineering). Link: https://play.google.com/store/apps/details?id=es.lacaixa.mobile.android.newwapicon&hl=en Technologies: Android, Clean architecture, Java, Node.js, Jenkins, Sonarqube, Dexguard. ### Personal blog (2016) My own personal blog where I share my thoughts from time to time. Link: https://mguellsegarra.github.io Technologies: Web, Javascript, Github Pages, Hexo.io, Jamstack. ### Pudahuel (2015) Santiago de Chile's airport app. Check flight information and subscribe for notifications. QR reader and parking information. Link: https://play.google.com/store/apps/details?id=com.massiva.nuevopudahuel Technologies: Android, iOS, Java, Objective-C, Node.js, Angular, Javascript, MongoDB, Express, Web. ### MySEAT (2015) MySEAT connected Car project. Using car data for different driving metrics, graphics, tips, and more Link: https://youtu.be/DfMuIt4ar8I Technologies: Android, Java. ### Abaxis VueScan (2015) An app-based solution to veterinary diagnostics, operating right from your iOS mobile device. Abaxis is an American medical technology company from Mountain View, California. Link: https://apps.apple.com/es/app/vetscan-vue/id1103175806 Technologies: Web, Angular, CSS, iOS, Objective-C. ### Animalear (2015) eCommerce app with veterinary products. Tinder like application for your pets with geolocation and push notifications. Integrated chat. Admin site Link: https://animalear.com/b/app-para-gatos-perros-mascotas Technologies: Web, Angular, CSS, Node.js, iOS, Android, Java, Objective-C, MongoDB, Express. ### GProvincia (2015) Touristic app where you can consult a large number of places of interest in the Tarragona province, as well as daily offers in shops, services, bars, restaurants… Link: https://studi7.com/projecte/app-gprovincia/ Technologies: Cordova, iOS, Ionic, Javascript, Objective-C. ### Pans & Company (2015) Mobile app for customer loyalty through offers and discounts for the restaurant chain Link: https://play.google.com/store/apps/details?id=es.eatout.panscompany&hl=en Technologies: Android, iOS, Java, Objective-C. ### CocaCola (2014) CocaCola's promocodes landing page. Link: https://www.cocacola.es/es/music/ Technologies: Web, PHP, CSS. ### Imprify (2014) Application for creating photo albums, prints and photo collages. Simply, easy to use and with a lovely result. Link: https://www.bebesymas.com/compras-para-bebes-y-ninos/lo-hemos-probado-imprify-sencilla-aplicacion-para-crear-albumes-fotograficos Technologies: Android, iOS, Java, Objective-C. ### Loodi (2014) Mobile app for scheduling and making appointments for padel matches Link: https://www.loodi.es/ Technologies: Android, Java. ### Marketing4eCommerce (2014) RSS-like reader app for the company news feed Link: https://marketing4ecommerce.net/ Technologies: Android, Java. ### ABA English (2014) English learning course app. Featured by Apple in 2014. Google Play best of 2016: 'Best self help app'. Top #5 Apple AppStore. Link: https://play.google.com/store/apps/details?id=com.abaenglish.videoclass&hl=en Technologies: Android, iOS, Java, Objective-C. ### Butifarra (2014) Traditional catalan card game named botifarra. First multiplayer game of its kind in the AppStore, for iPhone and iPad. Reached top #1 in Cards category. In-app purchases and ads. Link: https://apps.apple.com/es/app/butifarra/id878102130?l=ca Technologies: iOS, Game, Objective-C. ### DiceRoll (2013) An easy implementation of a Telegram bot for rolling the dice made with Node.js. Link: https://github.com/mguellsegarra/diceroll_telegram_bot Technologies: Javascript, Node.js, Bot. ## How can I help with your project? I help projects get built with AI. I spent about 18 years building software without it. Now I use that experience to work faster and with more confidence in the result. I build web apps, mobile apps and backend services with coding agents. If you have a project in mind, email me with what you need and when you need it. I work remotely, and I am available from UTC to UTC+8. ## How can you contact me? Email: marc@ondori.dev - [GitHub](https://github.com/mguellsegarra) - [LinkedIn](https://www.linkedin.com/in/mguellsegarra/) - [X](https://x.com/mguellsegarra)