Emerson Quijada Rafael

Full Stack Developer · Java & Spring Boot · Angular | Production Systems

Huancayo, Peru

About me

Full Stack Developer and Technical Degree holder with solid experience designing and deploying business management systems (ERP/POS) in production for real-world environments. Specialized in the Java ecosystem (Spring Boot 3.x, Java 21) and modern frontends with Angular 19 (Signals). Expert in solving complex business problems through Hexagonal Architecture, DDD, and offline-first solutions (Service Workers/IndexedDB) for high-transaction environments. Focused on delivering robust, scalable software oriented toward business results.

Work Experience

Importaciones DENRAF
Full Stack Developer

2025 - Current
Production ERP (Vercel + Digital Ocean) for a real import and retail business operating at trade fairs. Evolved from a pure Angular application into a complete Full Stack architecture with Angular 19, Spring Boot 3.5 / Java 21, PostgreSQL, and Docker Compose. Includes 10+ modules: POS, sales history, clients, inventory with financial intelligence, dashboard, reports with Excel/PDF export, gamified vendor goals, smart notification system, multi-currency (PEN/USD), QR payments, and business settings.
- Designed a Financial Intelligence engine that classifies inventory by health (Active, Slow, and Frozen Capital) and generates automatic liquidation plans to optimize cash flow.
- Implemented a Smart Notification Center that generates real-time alerts regarding sales trends, critical stock levels, and billing milestones.
- Architected the solution using Hexagonal Architecture and DDD, ensuring total decoupling between business logic (Use Cases) and infrastructure (Spring Boot, PostgreSQL).
- Developed an advanced Enterprise Configuration module with support for multi-currency (PEN/USD), tax profile management (RUC/NIT), and ticket customization.
- Implemented offline-first architecture with IndexedDB and Service Workers, guaranteeing 100% operational availability in zero-connectivity environments.
- Migrated the frontend stack to Angular 19 (Signals) and automated deployment with Docker Compose on Digital Ocean, improving operational efficiency by 40%.
Calzados La Peruanita
Full Stack Developer

2025 - 2025
Production sales and inventory system for a footwear store. End-to-end design and implementation with Angular, Spring Boot, and PostgreSQL, enabling the store to digitize its invoicing, stock control, and logistics.
- Designed the relational data model in PostgreSQL for hierarchical and scalable inventory management (product → color → size).
- Developed secure RESTful APIs with Spring Boot to orchestrate invoicing, order management, and operational reporting.
- Built a reactive and modular UI in Angular, optimizing the administrator's workflows for stock and sales control.
- Automated the Full Stack ecosystem deployment across multiple cloud environments (Render for backend, Vercel for frontend).
Alarcon Lozano Ingenieros · Lan Center Batlenet
IT Support & Network Technician

2020 - 2023
IT support roles in hardware, software, and networking that built a solid foundation in infrastructure, system diagnostics, and problem-solving — skills I now apply when designing production architectures.
- Hardware, software, and network connectivity fault diagnosis and resolution.
- Router configuration, structured cabling, and end-device management.
- Technical report writing and system backup management.

Education

CIBERTEC

2015 - 2019

Computing and Information Technology Solutions

Tipo de estudio: Technical Degree
Universidad Continental

2023 - Current

Systems and Computer Engineering

Tipo de estudio: Higher Education (7th Semester)
Mitocode
Certificación
2023 - 2023

Java 17 Backend Developer, Software Engineering

Tipo de estudio: Certification

Calificación: 19
Universidad Nacional de Ingeniería
Certificación
2019 - 2019

IT Technical Support Specialist, Information Technology

Tipo de estudio: Specialization

Calificación: 19

Projects

Zen Garden Portfolio •

Professional interactive portfolio with a minimalist 'Zen' aesthetic, designed to showcase advanced UI/UX skills and high-performance animations.

Built with Angular 19 and GSAP for smooth, high-fidelity micro-animations.Implementation of a custom 'Zen Enterprise' design system focused on clarity and minimalism.Extreme optimization for performance and accessibility (A11y).
Library Management System •

Web system for managing book loans and returns in libraries. Implemented with Spring Boot and MySQL, it allows registering books, users, and controlling loan history in real-time.

Book registration and search by title, author, or category.Loan control, returns, and late penalties.User and role management (librarian and reader).Developed with Spring Boot (backend) and MySQL.
Importaciones DEN •

Server-side rendered e-commerce built with Next.js and Tailwind CSS for an imported clothing store.

SSR e-commerce with Next.js and App RouterProduct catalog with dynamic filters and responsive designPayment gateway integration in progress

Skills

Java
Spring Boot
Angular (Signals)
PostgreSQL
HTML
CSS
JavaScript
Tailwind 4
TypeScript
Node
MySQL
Git
GitHub
Next.js
React
Docker
Docker Compose
JUnit / Mockito
REST API
JWT
DDD
Hexagonal Architecture