Freelancer profile translated to English.
Back to original languageAbout Jiajun
I am a Fullstack developer specializing in creating modern, fast, and scalable web applications that help businesses grow and digitize.
I primarily work with **React, Angular, Java (Spring Boot), and Node.js**, developing complete solutions: from attractive interfaces to secure and efficient APIs.
I have worked on real projects where I have developed:
- Authentication systems with JWT and role control (ADMIN/USER)
- Complete online stores with cart, favorites, and product management
- Custom administration panels
- Integrations with databases and complex business logic
How can I help you?
- Development of complete web applications (frontend + backend)
- Creation of online stores and custom platforms
- Secure and scalable REST APIs
- Optimization and improvement of existing projects
- Modern landing pages focused on conversion
I focus on offering practical, well-structured, and production-ready solutions. I don't just develop; I also think about how your product can function better and scale.
If you have an idea or need to improve your current project, let's talk.
Spanish
Native or bilingual
Chinese
Native or bilingual
English
Basic
Can work on-site
Barcelona (up to 50km)
Experience
- Fundación EsplaiFull Stack Java Developer BootcampTECHMay 2024 - August 2024 (3 months)Barcelona, SpainFull Stack Java Bootcamp focused on the development of web applications with Java and Spring Boot.Experience in creating REST APIs, managing business logic, and data persistence.Knowledge in frontend with JavaScript and React for the development of dynamic interfaces.
- Virtual doingVideo Game DeveloperJanuary 2024 - June 2024 (5 months)Barcelona, SpainCollaboration with the team on the interactivity of the story and visual scenarios of the video game. Programming the video game code, using C# programming languages and developing quality code with C#, well-structured, facilitating understanding for future changes or modifications. 2D and/or 3D graphics programming with Blender. Design of the game's interface, menu, and interactions.
- Virtual doingProgramador de videojuegosJanuary 2024 - June 2024 (5 months)Colaboración con el equipo en la interactividad de la historia y los escenarios visuales del videojuego. Programación del código del videojuego, utilizando lenguajes de programación c# y desarrollo códigos de calidad con c#, bien estructurados, que faciliten la comprensión para futuros cambios o modificaciones. Programación gráfica en 2D y/o 3D con Blender Diseño de interfaz, menú e interacciones del videojuego
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Education
- Higher Level Training Cycle in Web Application DevelopmentCampus net2024CFGS de desarrollo de aplicaciones web
- Cybersecurity courseThe Power2025
Certifications
- Microsoft Certified: Azure FundamentalsMicrosoft2024