Practical scalability
I design decoupled components ready to evolve with traffic, team size, and product complexity.
FullStack Software Engineer · Backend & Architecture
Hi, I am José Manuel Serrano Crespo
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
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.
I design decoupled components ready to evolve with traffic, team size, and product complexity.
I optimize query paths, latency, and throughput based on metrics that affect end-user experience.
Code review standards and automation ensure reliable releases in shorter cycles.
Experience
Each role strengthened my approach to architecture, performance, and internal product development with strong operational impact.
2025 - Present
IQUO Digital
2023 - 2024
Administración Santa Lucía
2023
Root Heim Company
Projects
Solutions designed to solve real operational problems, improve decision-making, and scale without technical friction.
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.
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.
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.
Skills
Hands-on expertise in backend engineering, modern frontend, and continuous delivery practices for production-ready software.
Contact
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.
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