Currently working at Banco Santander as a Full-Stack Developer in one of the most demanding environments of my career. I contribute to internal banking platforms and core initiatives across multiple teams, improving business tools and digital experiences for internal clients and employees. 2 years consecutives of excellents performance ratings.
Hello!
My name is Juan Jesús Sedano Calderón, and I am a Full-Stack Developer currently working at Santander, one of the most demanding and high-impact environments in my professional career. I have 4 years of experience delivering digital solutions in banking and enterprise contexts, with a strong focus on quality, scalability, and business value.
My journey has been shaped by agile teams, complex technical ecosystems, and high-responsibility projects where reliability and continuous improvement are essential. I enjoy collaborating across teams, and building products that have a clear impact on users and business goals.
💻
My Skills
Frontend
Angular 16+
TypeScript
JavaScript
HTML
CSS
Tailwind CSS
Sass
Flexbox
Responsive Design
Microfrontends
Storybook
Stencil
Backend & Data
NestJS
REST APIs
PostgresSQL
TypeORM
MongoDB
Swagger
Postman
Npm
Microservices
Git
GitHub
CI/CD with GitHub Actions
Quality, AI & Collaboration
Unit Testing
Jest
TS-Mockito
AI-assisted development
Code agents
Devin
Figma
English
Agile
Scrum
Browser DevTools
Professional Experience
Worked for Santander as an external consultant, developing business applications with Angular, NestJS, and microfrontend architecture. This role led directly to my internal position at the bank.
First professional experience in the sector, where I worked with React, Jinja2, HTML, CSS, and Storybook on hotel booking engines and marketing websites for hotel chains.
My education
Higher National Certificate in Web Application Development (DAW)(2020 - 2022)
Subjects
- Database fundamentals
- Computer systems
- Programming
- Markup languages
- Vocational guidance and work placement preparation
- Development environments
- Server deployment
- Web development in client-side environments
- Web development in server-side environments
- Web interface design
Udemy Training
- Layouts (flexbox - CSS Grid)
- Advanced CSS + Sass & Mixins
- NPM packages
- First steps with React.js
Angular 12 & Node Bootcamp (272 hours - In-person)
- Component interaction and services
- Reactive forms & validators
- Routing, modules & lazy loading
- Dynamic view management
- RxJS
- APIs & microservices (Node.js)
- Best practices & agile methodologies, introduction to Scrum
Free training - IMFE (Málaga)
- Digital skills: Information security area
- Creating blogs and websites with WordPress
- Tourism English
My projects
La Cafetería
Built from scratch using Sass and Gulp, with a clean and responsive layout designed for a real café brand experience.
My Portfolio
Built from scratch using HTML, CSS, and JavaScript, with animations, responsive layouts, and validated contact forms.
jNotes
A note-taking app built with React, including search, creation, and organization features for an efficient daily workflow.
Airbnb Demo
A responsive landing page inspired by Airbnb, built with Flexbox and a small interactive JavaScript slider for image switching.
Furniture Store
A responsive storefront built with HTML and CSS, using Flexbox & CSS Grid for layout, galleries, navigation, and forms.
