Freelancer profile translated to English.
Back to original languageAbout César
👋 Hi! I'm César — a full-stack developer with 7+ years of experience building modern web applications, and 3+ years specializing in blockchain technologies.
I’ve developed and deployed production-ready dapps on Solana, IOTA, and EVM-compatible chains like Polygon, using robust back ends (Node.js, Express, SQL) and dynamic front ends (React, Next.js, SvelteKit). My code is clean, scalable, and always user-focused.
Recently, I’ve expanded into the intersection of Web3 and extended reality (XR), delivering interactive 3D experiences using Three.js and WebGL. I’ve already completed real projects in this space and continue to deepen my skills in spatial UI, real-time rendering, and user interaction. I bring solid Web3 expertise with a creative mindset to explore new frontiers.
If you're looking for someone experienced, reliable, and driven to keep learning — let’s build something meaningful.
Always learning, always shipping. 🚀
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👋 Hello! I am César, a full-stack developer with over 7 years of experience creating modern web applications and over 3 years specializing in blockchain technologies.
I have developed and launched production-ready dapps on Solana, IOTA, and EVM-compatible chains like Polygon, combining robust backends (Node.js, Express, SQL) with dynamic frontends (React, Next.js, SvelteKit).
My code is clean, scalable, and always user-focused.
Recently, I have expanded my profile towards the intersection of Web3 and extended reality (XR), creating interactive 3D experiences with Three.js and WebGL. I have already completed real projects in this area and continue to deepen my knowledge in spatial interfaces, real-time rendering, and advanced interaction. I bring a solid foundation in Web3 with a creative mindset focused on exploring new territories.
If you are looking for someone with experience, reliability, and a desire to keep learning, let's build something meaningful.
Always learning, always building. 🚀
Spanish
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- 3DforscienceThree.js DeveloperSOFTWARE PUBLISHINGApril 2025 - May 2025 (1 month)Madrid, SpainDevelopment of a web page with a 3D object developed with Next.js, Three.js, Fiber and Drei. The project showcases a 3D animated cell rendered in real-time using WebGL. It features subtle interactivity based on mouse movement, layered transparency effects, and cinematic lighting inspired by biomedical rendering.The goal is to explore high-fidelity 3D storytelling on the web — lightweight, immersive, and responsive.---Development of a web page with a 3D object using Next.js, Three.js, Fiber, and Drei. The project features an animated 3D cell rendered in real-time using WebGL. It incorporates subtle mouse-movement-based interactivity, layered transparency effects, and cinematic lighting inspired by biomedical visualization.The goal is to explore new forms of high-fidelity 3D storytelling on the web: lightweight, immersive, and adaptable to any device.
- Boxfish Studio SLSenior Web3 DeveloperSOFTWARE PUBLISHINGApril 2022 - April 2025 (3 years)Madrid, SpainBoxfish Studio is a technology start-up specializing in Web3 applications. As a Full-Stack Web3 Developer, my responsibilities included:- Building web apps using React with Next.js and Svelte with SvelteKit for the front-end, and Node.js for the back-end.- Leading the development of a Solana-based project, using Next.js and Node.js with Express. I was in charge of building and maintaining APIs, managing databases, and handling migrations and schema updates.- Developing apps for IOTA with SvelteKit and React on the front-end, and Node.js with Prisma on the back-end.- Collaborating with cross-functional teams, using Agile methodologies to deliver robust, scalable, and user-focused applications.I contributed both independently and as part of a team, and gained experience leading small teams to deliver production-ready Web3 products. My role demanded technical versatility, proactive problem-solving, and effective communication across all stages of the project lifecycle.---Boxfish Studio is a technology start-up specializing in Web3 application development. As a Full-Stack Web3 Developer, my responsibilities included:- Developing web applications with React (Next.js) and Svelte (SvelteKit) for the front-end, and Node.js for the back-end.- I led a Solana-based project, using Next.js and Node.js with Express, responsible for APIs, database management, migrations, and schema adjustments.- Developing apps for IOTA with SvelteKit and React on the front-end, and Node.js with Prisma on the back-end.- Collaborating with multidisciplinary teams using agile methodologies to deliver robust, scalable, and user-centric applications.I participated in both individual and team developments, and led small initiatives to production delivery. The role required technical versatility, problem-solving autonomy, and effective communication throughout all development phases.
- Mnemo ConsultingFullStack Web DeveloperSOFTWARE PUBLISHINGJune 2020 - November 2021 (1 year and 5 months)Madrid, SpainMnemo is a technology consulting company offering digital transformation services. As a Full-Stack Web Developer, my main responsibilities included:- Developing web applications using Vue.js 2.0 and Angular 6 for the front-end, and Python for the back-end.- Ensuring high-quality standards by testing Angular-based apps with tools like Karma and Jasmine.- Working with a banking client to build internal apps to manage requests, improving workflow and efficiency.- Gaining experience with cloud deployment using Google Cloud Platform.- Implementing state management, data tables, MVC communication, and web security to ensure scalability and maintainability.At Mnemo, I took ownership of the entire web development cycle — from requirements gathering to deployment. I applied strong front-end and back-end skills, as well as cloud knowledge, to deliver reliable and scalable software. I worked independently, met deadlines, and focused on delivering quality solutions.---Mnemo is a technology consulting company offering digital transformation services. As a Full-Stack Developer, my main responsibilities included:- Developing web applications with Vue.js 2.0 and Angular 6 on the front-end, and Python on the back-end.- Ensuring high-quality standards through testing with tools like Karma and Jasmine.- Developing internal applications for a client in the banking sector, improving operational efficiency.- Gaining experience in cloud application deployment using Google Cloud Platform.- Implementing state management, data tables, MVC communication, and web security to ensure scalable and maintainable applications.During my time at Mnemo, I took responsibility for the entire development cycle, from requirements gathering to production deployment. I combined technical skills in front-end, back-end, and cloud computing to deliver reliable solutions, meeting deadlines and quality standards autonomously.
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Education
- Master on Industry 4.0UNIR - International University of La Rioja2022UNIR is a private university in Spain offering a wide range of undergraduate and postgraduate degrees. I completed a Master’s degree in Industry 4.0, a specialization in Industrial Engineering focused on emerging technologies for the digital transformation of industry. During this program, I gained knowledge and practical understanding of key technologies shaping the future of industrial systems: - Internet of Things (IoT) - Blockchain - Artificial Intelligence (AI) - Big Data - Robotics - 3D Printing - Cloud Computing - Cybersecurity The master’s degree provided both technical and strategic perspectives on how to integrate these technologies into industrial environments. --- UNIR es una universidad privada en España que ofrece una amplia variedad de titulaciones de grado y posgrado. Realicé un máster en Industria 4.0, una especialización dentro de la Ingeniería Industrial centrada en las tecnologías emergentes para la transformación digital del sector. Durante el máster, adquirí conocimientos y comprensión práctica sobre las principales tecnologías que están revolucionando la industria: - Internet de las Cosas (IoT) - Blockchain - Inteligencia Artificial (IA) - Big Data - Robótica - Impresión 3D - Computación en la Nube - Ciberseguridad El programa ofrecía una visión tanto técnica como estratégica sobre cómo aplicar estas tecnologías en entornos industriales reales.
- Bachelor of Science in Computer EngineeringUAH - University of Alcalá2019University of Alcalá is a public university in Spain offering a wide range of undergraduate and postgraduate degrees. I completed a Bachelor’s degree in Computer Engineering, a specialization in Computer Science focused on the design and development of software and systems. During my studies, I acquired solid theoretical and practical knowledge in areas such as: - Programming and software development - Data structures and algorithms - Computer architecture and operating systems - Networks, communications, and databases - Artificial intelligence and machine learning - Computer security and cryptography The program also emphasized hands-on experience through practical projects and fostered skills in problem-solving, critical thinking, and technical communication — essential for a successful career in computer engineering. --- La Universidad de Alcalá es una universidad pública en España que ofrece una amplia oferta de grados y posgrados. Cursé el Grado en Ingeniería Informática, una especialización centrada en el diseño, desarrollo y gestión de software y sistemas informáticos. Durante mis estudios, adquirí conocimientos teóricos y prácticos en áreas como: - Programación y desarrollo de software - Estructuras de datos y algoritmos - Arquitectura de ordenadores y sistemas operativos - Redes, comunicaciones y bases de datos - Inteligencia artificial y aprendizaje automático - Seguridad informática y criptografía El grado también incluía proyectos prácticos y desarrollo de habilidades clave como la resolución de problemas, el pensamiento crítico y la comunicación técnica, fundamentales para el ejercicio profesional en la ingeniería informática.
Certifications
- Master’s Degree in Industry 4.0UNIR – International University of La Rioja2023
- Bachelor’s Degree in Computer EngineeringUniversity of Alcalá2021