JAVIER
CASAHUAMAN

Systems Engineer // Fullstack Dev

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Who I Am

Bridging the gap
between logic &
imagination.

I am a Systems Engineer obsessed with performance and a Fullstack Developer in love with aesthetics.

My approach combines rigorous architectural patterns with fluid, reactive interfaces. I don't just build websites; I engineer immersive digital ecosystems that scale.

3+

Years Exp.

30+

Projects Shipped

Featured Projects

Explore my latest projects

Ecommerce TechShop

Ecommerce TechShop

Online store specializing in computer hardware, peripherals, and components. Includes user and administration panel, and product/order management.

Next.jsTypescriptPostgreSQLTailwind
Inventory Manager

Inventory Manager

The system allows CRUD operations, authentication, report generation, notifications, an administration panel, and more.

.NETEFDockerSQL Server
Ecommerce Keyist

Ecommerce Keyist

E-commerce website with shopping cart, search filter, administration panel, authentication.

JavaSpring BootAngularMySQL
Room Reservation System

Room Reservation System

Web application for room booking control with workflow to create pre-contract room quotes, user authentication controlled by the administrator.

.NETEFDockerSQL Server
Portfolio v1

Portfolio v1

Previous version of the personal portfolio.

Next.jsReactThree.jsTailwind
Light Curve

Tech Arsenal

Powered by modern engineering

Node.js
.NET
Java
Spring Boot
Angular
React
Next.js
Nest.js
TypeScript
JavaScript
HTML5
CSS3
Tailwind
Docker
AWS
SQL SERVER
MySQL
PostgreSQL
Python
Three.js
Framer
GSAP
Git
GitHub
Node.js
.NET
Java
Spring Boot
Angular
React
Next.js
Nest.js
TypeScript
JavaScript
HTML5
CSS3
Tailwind
Docker
AWS
SQL SERVER
MySQL
PostgreSQL
Python
Three.js
Framer
GSAP
Git
GitHub
Node.js
.NET
Java
Spring Boot
Angular
React
Next.js
Nest.js
TypeScript
JavaScript
HTML5
CSS3
Tailwind
Docker
AWS
SQL SERVER
MySQL
PostgreSQL
Python
Three.js
Framer
GSAP
Git
GitHub

Career Timeline

present

Analyst Developer

@ SOFTLIX

Development of software solutions using Node.js with TypeScript on the backend and React with Next.js on the frontend, optimizing performance and SEO.
Implementation of scalable RESTful APIs with a modular architecture and separation of duties principles.
Development of authentication and authorization systems with JWT and OAuth 2.0, including role-based access control.
Application of a microservices-based architecture, enabling module decoupling and independent deployments.
Implementation of CI/CD pipelines to automate build, testing, and deployment processes.
Integration with AWS S3 for secure file storage using signed URLs.
Node.jsNext.jsNest.jsReactTypeScriptPostgreSQLTailwindCSS
2025 - 2026

FullStack Developer

@ HELPDESK ALL SERVICES

Development and maintenance of software solutions within an ERP system used by companies in Peru, implementing functional improvements and optimizing processes to increase operational efficiency.
Leading the development of the 'Room Reservation Management' web system for the CIP (Peruvian College of Engineers), using .NET Core 8 MVC.
  1. Implementation of user, role, and permission management with ASP.NET Identity, ensuring access control and system security.
  2. Development of secure RESTful APIs, including authentication, validation, and structured exception handling.
  3. Configured SMTP services for automated email notifications and alerts to users, improving system communication.
  4. Implemented report generation in Excel/PDF using Rotativa and deployment on Ubuntu servers using Docker.
.NET CoreASP.NET MVCDockerUbuntuIdentitySQL Server
2024 - 2025

Fullstack Developer

@ FREELANCE

E-commerce
Implementation of a versioned RESTful API, following HTTP best practices, using DTOs, and employing semantic endpoint management.
Development of an authentication and authorization system using Spring Security + JWT, including role-based access control and endpoint protection.
Configuration of custom filters for JWT validation, stateless session management, and password encryption with BCrypt.
Implementation of reactive programming with Spring WebFlux to optimize queries and improve scalability.
Automatic API documentation using Swagger and execution of unit tests with JUnit and Mockito to ensure quality and business logic.
Inventory Management System
Development of a robust backend using .NET Core and ASP.NET MVC, implementing layer architecture and SOLID principles.
Implementation of a secure RESTful API for managing products, categories, suppliers, and stock movements, following HTTP standards and using typed responses.
Development of business logic in the service layer for minimum stock control, expiration date validation, and automatic replenishment alerts.
Use of Entity Framework Core with optimized LINQ, applying eager loading and projections to improve query performance.
AngularSpring BootMySQL.NET CorePythonSQL Server
2023 - 2024

Junior Developer

@ IMFUNDO KAHLE

Development of interactive applications using HTML, CSS, and JavaScript, increasing user experience by 20%.
Participation in the design of relational databases and ER models, resulting in a 25% improvement in query times.
Adoption of agile methodologies (Scrum) and documentation of processes to simplify onboarding of new developers.
Utilization of Git and GitHub for version control, efficiently managing collaborative development.
HTMLCSSJavaScriptSQL ServerGitScrum
Get in Touch

Let's build something legendary.

I'm always open to discussing new projects, creative ideas or opportunities to be part of your visions.

Based in

Lima, Peru

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Designed & Built by Javier Casahuaman