Alejandro Navarro

I build scalable and secure web applications for real business needs

Full Stack Software Engineer focused on backend systems, APIs, cloud delivery, and security-aware engineering.

Book a conversation View Portfolio

Projects

Case Studies

Real-world projects across web applications, internal systems, and e-commerce with focus on architecture, scalability, and security.

Internal System 2026

Muebles JYN Control

Internal system to run furniture business operations: projects, clients, progress logs, payments, files, and key dates.

  • Next.js
  • React
  • Tailwind CSS
  • Prisma
View project
E-commerce / Catalog 2026

Muebles San Francisco JYN: corporate site + admin catalog

Bilingual corporate website with a manageable product catalog and private admin panel for categories and items.

  • Next.js 15
  • React 19
  • TypeScript
  • Tailwind CSS v4
View project
Commercial Landing 2026

Pinceles y Acrilico: nail studio landing page

Single-page static website designed to showcase services and portfolio while converting visits into WhatsApp bookings.

  • Astro 5
  • Tailwind CSS v4
  • TypeScript
  • Vite
View project
E-commerce 2026

Costa Rica furniture e-commerce with admin panel

Furniture online store with public shopping experience, customer account area, and admin panel for orders, payments, products, and inventory.

  • Next.js 16
  • React 19
  • TypeScript
  • Prisma
View project
Productivity 2026

Timora: work-day tracking and reporting

Web app to track work days, calculate payments including overtime, manage project templates, and export reports.

  • Next.js 15
  • React 19
  • TypeScript
  • Tailwind CSS v4
View project
View all projects

Engineering Notes

Articles

Technical notes on Full Stack development, backend architecture, and applied security in real projects.

View all articles
5 min read

Performance and clarity go together

A fast site isn't a technical whim: it reduces friction and builds trust.

Read article
04

How I Can Help

Work areas

Full Stack web applications for real operations

I design and implement complete web applications with frontend, backend, and database, prioritizing maintainability and long-term evolution.

APIs and backend for critical workflows

I build backend services with validation, role-based access, clear business rules, and reliable third-party integrations.

Architecture and quality for growing products

I work with modular architecture, clean coding standards, CI/CD workflows, and technical decisions that reduce long-term debt.

Security applied from day one

I integrate validation, access control, session handling, and OWASP-aligned secure defaults into core product flows.

05

Soluciones

How I execute

Architecture before implementation

Principle

Good design decisions reduce long-term technical debt.

Risk avoided

Jumping straight into code often creates coupling, scope drift, and expensive refactors.

Execution approach

I define domain boundaries, data flow, integration contracts, and stack decisions before implementation starts.

Expected outcome

More stable systems, faster iteration cycles, and safer feature growth over time.

Backend and APIs with explicit business rules

Principle

Critical logic should live in the server layer, not UI assumptions.

Risk avoided

Without strict validation and contracts, inconsistency appears across clients, services, and data stores.

Execution approach

I centralize business rules in services/use-cases, validate payloads, and protect actions with role-aware authorization.

Expected outcome

Reliable flows, fewer production defects, and better technical traceability.

Security integrated into delivery

Principle

Security works best when embedded in design and implementation.

Risk avoided

If security is postponed, controls are expensive to retrofit and risks remain hidden longer.

Execution approach

I apply input validation, access control, secure session handling, baseline hardening, and risk review in key flows.

Expected outcome

More robust systems, reduced attack surface, and stronger operational confidence.

06

How I Work

Technical process
01

Technical discovery

I review context, business goals, constraints, and risks before selecting architecture or tools.

02

Solution design

I define architecture, stack, scope, and delivery roadmap based on impact, complexity, and operational priorities.

03

Implementation

I implement by modules with quality gates, validations, and secure-by-default principles, delivering usable increments.

04

Delivery and evolution

I deliver documentation, operational recommendations, and a clear next-step plan to scale safely.