· TURNING IDEAS INTO PRODUCTS ·
* MAKER / TECH
* MAKER / TECH
* MAKER / TECH
* MAKER / TECH
* MAKER / TECH
* MAKER / TECH
* MAKER / TECH
* MAKER / TECH
Hi, I'm Santiago!
Full Stack Web & Mobile Developer
Zentia
A personal finance app designed to replace uncertainty with a clear view of your money.
Overview
Zentia started with a simple frustration: none of the personal finance apps I tried felt like something I genuinely wanted to use every day. They could track numbers, but the experience often felt cluttered, unintuitive or unnecessarily complicated. I wanted to create something more modern — simple, intuitive and fast — where recording a transaction takes seconds and opening the app gives you a clear picture of where you stand.
For me, tracking money isn't only about storing transactions. It is how financial awareness is built: understanding what you spend, what you earn, what you have left and what is coming next. Zentia was my attempt to turn that habit into a clearer and more enjoyable everyday experience.
Project facts
Freelance websites. Different industries, different constraints.
Since 2021, I have worked directly with clients across construction, tourism, fitness, marketing and education. The brief is rarely complete at the beginning. My job is to uncover what the business needs to communicate, turn it into a clear digital experience and carry the work through feedback, responsive implementation, deployment and domain launch.
Five projects, from initial brief to final launch.
Mimos para el Alma
Yoga · Studio & online platformA comprehensive digital presence for a holistic wellness and yoga space. The website combines an elegant, calm aesthetic with a private online platform, allowing members to access recorded classes, guided meditations, and exclusive content from anywhere.
Visit websiteSeiko
Fitness equipment · Product websiteA modern product showcase and leasing platform for a premium fitness equipment brand. The website highlights their catalog of cardio, strength, and wellness machines through immersive imagery and smooth animations, while guiding gym owners through a clear rental process.
Visit websiteMucho Marketing
Marketing · Agency websiteA bold, conversion-focused website for a marketing agency, designed to communicate its personality, services and value quickly. I organised the content into a clear journey, combining strong visual direction with focused calls to action and a responsive experience across devices.
Visit websiteThe Spider Calisthenics
Fitness · Calisthenics websiteA modern website for a calisthenics business, designed to present its training offer, programmes, facilities and community in a way that works for both prospective and existing members.
Visit websiteImesco
Construction · Corporate websiteA complete website for a sustainable construction company specialising in steel framing and modular buildings. I organised a complex service offering into clear paths for each construction system, added project galleries and detailed answers to high-intent customer questions, and created direct enquiry routes throughout the experience.
Visit websiteWhat I build. What I use.
What I build.
What I use.
My work spans websites, mobile applications and the services behind them. These are the technologies and tools I use to bring those experiences together.
Web development
JavaScript · TypeScript · React · Next.js · Tailwind CSS · VercelI build responsive websites and web interfaces, translating client requirements into clear layouts, reusable components and working interactions.
Mobile development
React Native · Expo · EAS · TestFlight · App Store ConnectI build mobile applications with React Native and Expo, working across interface design, implementation, testing on a physical device and release. Zentia was my first app published on the iOS App Store.
Data & integrations
Supabase · PostgreSQL · React Query · RevenueCatI use Supabase for authentication, databases and backend services, React Query to manage server data in the interface, and RevenueCat for in-app subscriptions.
AI-assisted development
ChatGPT · Antigravity · Cursor · Claude · GeminiI use AI to refine ideas, explore approaches, build, debug and iterate, transforming ideas into products through rapid prototyping. While these tools multiply my output, I remain responsible for the product decisions, the implementation, and the final result.
Across my projects, I use Git and GitHub for version control.
A non-traditional path into product building.
My path into technology wasn't planned. My background was in accounting, but during the COVID pandemic in 2021, I started learning HTML out of curiosity. HTML led to CSS, then JavaScript, React and Next.js. I followed the conventional self-taught path: online courses, documentation, tutorials and many small projects built from scratch.
In 2024, I started using Cursor and AI-assisted development tools. They didn't replace the foundations I had learned, they changed the speed and scale of what I could build. I moved from creating websites to building complete web and mobile applications.
What excites me most about AI isn't simply writing code faster. It is the possibility of exploring more ambitious ideas, discovering new solutions and turning something imagined into something people can actually use.
LET'S WORK TOGETHER.
I'm currently looking for an opportunity where I can contribute to a team across frontend, full-stack development, and digital experiences.
I bring initiative, adaptability, and hands-on experience turning requirements and ideas into working solutions. If you think my profile could be a good fit for your team, I'd be glad to hear from you.