GAAbout Guillermo
I'm a Software developer working with a team of experienced professionals to deliver high-quality, scalable software solutions. We specialise in building SaaS platforms, web and mobile apps, and automation tools that help businesses grow.
Currently, we collaborate with two high-impact platforms operating across Europe:
– HelloFlatmate, a full-featured real estate rental system with booking, payments, digital contracts, support tools and landlord dashboards.
– Viaje Seguro, a rideshare and van rental platform with smart trip planning, user matching, fleet management and QR-based boarding.
Our strength lies in combining clean architecture, product strategy and user experience design to create reliable, fast, and intuitive digital tools.
Whether you need to build a custom platform from scratch or improve an existing system, we can help you transform your idea into a solution that works — and scales.
💬 Looking for a trusted technical partner to build your next digital product? Let’s connect.
Spanish
Native or bilingual
English
Conversational
French
Conversational
Can work on-site
Geneva (up to 50km)
Experience
- HelloflatmateSoftware Developer – Real Estate & Property Management PlatformAugust 2024 - Today (1 year and 10 months)Valencia, SpainI’m currently leading the development and ongoing improvement of a complete real estate platform for room rentals in Valencia. The system allows tenants to view rooms, book online, sign digital contracts, pay monthly rent and utilities, and request maintenance or cleaning services—all from a single web app.Administrators manage tenants, properties, support tickets, income reports, and digital documentation through a powerful dashboard. Property owners have their own panel to track earnings, tenant activity, and invoices in real-time.The platform includes chat systems (support and maintenance), automated notifications, digital signature integration, payment gateway (RedSys), and custom admin tools.I continue working with the company as a freelance developer, ensuring growth, stability and ongoing feature improvements.Technologies: Next.js, Node.js, PostgreSQL, Tailwind CSS, Stripe, RedSys, Socket.IO
- Viaje SeguroBuilt a smart rideshare & van rental platform: trip planning, fleet booking & real-time matchingJanuary 2025 - Today (1 year and 5 months)Valencia, SpainI’m currently leading the development of a smart rideshare and vehicle rental platform that works as an alternative to BlaBlaCar. Users can request trips, join existing ones, or offer their own using personal cars or company-owned vans.The system empowers passengers to plan custom trips and uses matching logic to connect them with available drivers or trips. Administrators manage a fleet of cars and vans (with or without drivers), rentals, payments, and logistics through a central dashboard.The platform features user dashboards, booking flows, trip status tracking, integrated chat systems, QR-based boarding validation, and automated trip generation based on user preferences.I remain actively involved as a freelance contributor, optimizing and maintaining the system as it scales.Technologies: Next.js, NestJS, PostgreSQL, Tailwind CSS, Socket.IO, Stripe
Recommendations
Be the first to recommend Guillermo
Help this freelancer shine by sharing your experience working together.
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- Full Stack Web DeveloperSoy Henry2022🎓 Full Stack Web Developer – Henry Bootcamp I completed an intensive full-time training program at Henry, a renowned coding bootcamp focused on real-world, project-based learning. Over +800 hours of hands-on coding, I developed full stack web applications using modern technologies and agile methodologies. 💻 Technical Stack: Frontend: HTML, CSS, JavaScript, React, Redux Backend: Node.js, Express, Sequelize Database: PostgreSQL Tools: Git, GitHub, Trello, Slack Testing: Jest Methodologies: Agile & Scrum 🚀 What I built: A fully functional SPA (Single Page Application) using React, Redux, Node.js, and PostgreSQL A group final project simulating a real company environment with teamwork, planning, and code reviews End-to-end features: database design, API development, UI/UX, deployment 🤝 Soft Skills developed: Teamwork and communication Problem-solving under pressure Time management in fast-paced environments Daily collaboration using agile practices (SCRUM, pair programming)