FullStack Software Engineer · Backend & Architecture

Hi, I am José Manuel Serrano Crespo

I design robust productsthat scale with the business, never against it.

Software engineer with 2+ years of full-stack experience, focused on backend architecture and performance. I connect technical decisions with business impact: lower technical debt, faster APIs, and more reliable operations.

About me

Building software with an architecture-first mindset

I specialize in backend systems and software architecture. I enjoy working at the product core: business domain understanding, sustainable engineering decisions, and reliable delivery flows.

I do more than ship features. I improve complete systems: reducing technical debt, automating critical operations, and improving API and database performance to support growth without friction.

Practical scalability

I design decoupled components ready to evolve with traffic, team size, and product complexity.

Measurable performance

I optimize query paths, latency, and throughput based on metrics that affect end-user experience.

Delivery quality

Code review standards and automation ensure reliable releases in shorter cycles.

Education

  • Software Development and Management Engineering
  • Associate Degree in Multiplatform Software Development

Languages

  • Spanish (native)
  • English (intermediate)

Location

Mexico

Experience

Experience focused on outcomes

Each role strengthened my approach to architecture, performance, and internal product development with strong operational impact.

2025 - Present

Backend Developer

IQUO Digital

  • Reduced technical debt in critical backend services.
  • Designed scalable architectures for new business modules.
  • Optimized MongoDB queries to improve response times.
  • Enhanced REST API performance and drove engineering best practices through code reviews.

2023 - 2024

FullStack Developer

Administración Santa Lucía

  • Built a complete administrative platform with Java, Spring Boot, and PostgreSQL.
  • Automated critical workflows to reduce repetitive manual operations.
  • Implemented financial reporting modules for operational decision-making.
  • Trained end users to accelerate system adoption.

2023

FullStack Developer

Root Heim Company

  • Built a gym management system using PHP, MySQL, and JavaScript.
  • Implemented MVC architecture to improve maintainability.
  • Delivered user, payment, and attendance modules for daily operations.

Projects

Projects with product and architecture focus

Solutions designed to solve real operational problems, improve decision-making, and scale without technical friction.

01

Devstagram

Developers didn't have their own space to share technical work with real interaction. Devstagram solves that: a full-stack social platform built with Laravel and Livewire where devs post images, comment, like, and follow each other. Every like and comment interaction is fully reactive, no page reloads. The result is a complete platform with a personalized feed, profile management, image uploads, and a follower system running on a solid Docker-based architecture.

Laravel 10PHP 8.1Livewire 3Tailwind CSSMySQLDocker
02

TaskManager

Managing projects as a team requires more than task lists: it needs roles, statuses, notes, and an authentication flow that does not compromise security. TaskManager is a decoupled REST API built with Node.js, Express, and TypeScript on MongoDB that covers the full cycle. It supports registration with email confirmation, password recovery, long-lived JWTs, and a data model where each project has tasks with five possible statuses, per-task notes, and a team with role-based permissions.

Node.jsExpressTypeScriptMongoDBJWTNodemailer
03

Trackly

Subscriptions pile up quietly and most people have no idea how much they are actually spending. Trackly tackles that with a full SaaS for recurring expense management, built on a decoupled architecture: a Next.js 16 App Router frontend with a secure BFF layer, and a NestJS 11 backend on PostgreSQL with Prisma. Features include a financial dashboard with monthly and yearly views, category-level analytics, payment method CRUD, and an automatic reminder system driven by BullMQ and Redis job queues. Secure auth via httpOnly cookies with persistent sessions.

Next.js 16TypeScriptNestJS 11PostgreSQLPrismaBullMQRedis

Skills

Technical stack

Hands-on expertise in backend engineering, modern frontend, and continuous delivery practices for production-ready software.

Backend

  • Node.js
    Node.js
  • Express
    Express
  • Java
    Java
  • Spring Boot
    Spring Boot
  • PHP
    PHP
  • Laravel
    Laravel
  • MongoDB
    MongoDB
  • PostgreSQL
    PostgreSQL
  • MySQL
    MySQL

Frontend

  • React
    React
  • Next.js
    Next.js
  • TypeScript
    TypeScript
  • Tailwind CSS
    Tailwind CSS
  • Astro
    Astro

DevOps & Tools

  • Docker
    Docker
  • Git
    Git
  • GitHub
    GitHub
  • Prisma
    Prisma
  • Redis
    Redis

Contact

Let us build something that truly scales

If you need a technical profile with product mindset, architecture depth, and delivery focus, I am ready to contribute.

Open to remote or hybrid FullStack/Backend opportunities.

Send email