Freelancer profile translated to English.
Back to original languageAbout Sergio
Full Stack Software Developer and Technological Solutions Architect
FreelanceFull Stack Developerspecializing inReact, Next.js, React Native, NestJS, Node.js, TypeScript, and PostgreSQL**. I have led and developed web and mobile projects from scratch, covering everything from microservice architectures to serverless solutions on **AWSand deployments withDockerand **Kubernetes**.
I regularly work withVite, Tailwind CSS, TanStack Query, Prisma, Zustand**, and tools like **ExpoorFirebasefor mobile apps. I also have experience in workflow automation,CI/CDwith **GitHub Actions**, and managing cloud environments like **Railway, Vercel, Render**, or **Azure**.
I have developed complete administration panels, employee time tracking and mental health mobile apps, SEO-optimized landing pages, and multi-component platforms like Mudepo (sports management). I focus on scalable, efficient, and user-centric solutions.
🔍 Key Technologies:React · Next.js · React Native · NestJS · Node.js · TypeScript · PostgreSQL · Prisma · Zustand · TanStack Query · Docker · AWS · Vite · Tailwind · CI/CD · Firebase · Expo · MongoDB
If you are looking for someone who combines speed, clean code, and product vision, I will be happy to help you take your project to the next level.
Spanish
Native or bilingual
English
Conversational
Remote only
Primarily works remotely
Experience
- Idiomas PrincipadoCorporate Landing Page DevelopmentEDUCATION AND E-LEARNINGJuly 2025 - August 2025 (1 month)Plasencia, SpainI designed and developed amodern landing pageaimed at attracting students for the Idiomas Principado English academy. The project included:*Clear structurewith sections for Home, Services, Announcements Board, and Photo Gallery.
- Development withNext.jsto ensureperformanceand **SEO**.
- Color palette and typographyadapted to the academy's identity**, conveying **trustand **professionalism**.
- Contact page optimized for **lead generation**, linked to their social media.
- Announcements Boardintegrated with my own Blogs service**, using **SSR(Server Side Rendering) to optimize the website's **SEO**.
The result is alightweight**, **responsivewebsiteready to growin the future with new functionalities like online booking integration or an internal intranet.. - MindsAPPMinds / MindaraSPORTSFebruary 2025 - Today (1 year and 6 months)Plasencia, Spain🧠 Minds / Mindara – Mental Load Assessment Platform for Fitness CoachesProject Description:Minds (and its version for health centers, Mindara) is a platform developed for fitness coaches to monitor and analyze the mental load of their athletes. The system allows for user management, scheduling and recording validated psychological tests (such as RPE, WELLNESS, POMS, or CCMDE), and generating reports with key metrics for tracking athletes' mental state.The tool is designed to facilitate decision-making and prevent situations of mental overload or fatigue, combining a scientific approach with an accessible interface for sports professionals.Technologies Used:Frontend (Dashboard): React, NextJS, TypeScript, TailwindCSSMobile App (athletes): React Native (Expo)Backend: NestJS, PrismaDatabase: PostgreSQLDevOps: VPS, Dokploy, Docker, cloud environment deploymentOthers: JWT authentication system, PDF generation, role control (coaches, supervised users)Role in the Project:Within the startup, I took on CTO responsibilities, leading the project's technical architecture and making key decisions about technologies and development strategy. Additionally, I actively participated in the platform's development, building both the dashboard for fitness coaches and the mobile app for end-users, ensuring seamless integration between backend and frontend. I also coordinated the product's evolution based on user feedback and business vision.
- Data5Mudepo. Sports Competition ManagementSPORTSOctober 2024 - Today (1 year and 10 months)Burgos, SpainMudepo is a comprehensive platform for sports competition management, designed with a focus on efficiency, usability, and scalability. The solution includes an administration dashboard, an app for players, and an app for referees, covering everything from tournament organization to the digitalization of match reports.Technology:
- Frontend: React with Vite, Tailwind CSS, and TypeScript.
- Backend: NestJS with Prisma and MongoDB database.
- Infrastructure: Deployed on AWS.
- Authentication and Security: JWT for authentication and permission management.
- Optimization and Performance: Efficient API with caching and database load reduction strategies.
Featured Functionality:- Competition administration with team, calendar, and penalty management.
- Digitalization of reports for referees, streamlining real-time data recording.
- Platform for players, where they can check statistics and results.
- Scalability and expansion, with plans to include more sports disciplines in the future.
Mudepo is constantly evolving to improve sports management with advanced technology.
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Education
- Cross-Platform Application Development, Computer Programming, Specific ApplicationsIES Valle del Jerte2020Desarrollo de Aplicaciones Multiplataforma, Programación informática, aplicaciones específicas