Welcome to my GitHub profile! I am a Systems Engineer and a passionate Full-time Freelancer specializing in Fullstack web development and cross-platform mobile apps.

I focus on building scalable web applications with React / Next.js and shipping iOS and Android apps with React Native (Expo). From the frontend to the API and the database, I deliver high-quality, maintainable code.

As of March 2026, I have signed a contract to dedicate 100% of my professional time to a new project and team.

Because of this commitment, I am no longer accepting freelance work, consulting, or full-time opportunities at this time.

I want to sincerely thank all the clients, collaborators, and the Upwork community who trusted me with their projects during my freelancing years. Those experiences played a major role in shaping my skills as an engineer and problem solver.

My GitHub will continue to reflect my technical work, experiments, and projects, but I am currently focused on building within this new long-term engagement.

Thank you to everyone who has been part of the journey. 🚀

I am a Top Rated Freelancer with a 100% Job Success Score on Upwork. This represents hundreds of hours of high-quality delivery, satisfied clients, and consistent 5-star reviews.

Why clients choose me:

• 🏆 Top Rated: Part of the top 10% of freelancers on Upwork.
• ✅ 100% Job Success: Perfect track record with every client.
• ⭐ Reliability: Clear communication and deadlines are my priority.

I currently maintain an active roster of clients through Upwork and direct contracts. However, I am always open to hearing about exciting new projects.

If you have a clear vision or a challenging problem that requires an expert in Fullstack (React / Next.js / Node) or Mobile (React Native / Expo), please reach out. If I am fully booked, I will let you know immediately, but I always make time to discuss potential future collaborations.

I work with a robust set of technologies to bring ideas to life:

Databases:

Frontend & Backend:

DevOps & Tools:

Mobile (iOS & Android):

Styling:

When I'm not coding, you can find me:

• 🏃‍♂️ Running: I enjoy morning runs to clear my mind.
• ⚡ Harry Potter Fan: My favorite book and movie series.
• 🎸 Music Lover: I'm into Soft, Hard, and Indie Rock.
  • Current rotation: The Strokes, Tame Impala, Cage the Elephant, Arctic Monkeys.

Ready to start a project? Contact me directly:

• Email: arivalladares2.0@gmail.com
• Resume: View Resume