You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Daniel Castelló YusteDC

Daniel Castelló Yuste

Web and Cross-Platform Application Developer

€360/day
Valencia, ES
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Daniel

Computer Engineer focused on Architecture, Applied AI, and Automation. I am transitioning towards Solution/Technical Architect roles, and my strength lies in translating business objectives into robust, scalable, and measurable systems (cost, reliability, performance, and maintainability).

I have experience building software and platforms where the value is not in 'shipping features,' but in good system design: architecture, data, integrations, contracts, observability, and operation. I am comfortable moving between strategic vision and technical execution when needed.

My specialty: optimizing processes and reducing operational friction by combining well-thought-out architecture + automation + AI only when it brings real value.

- End-to-end architectures (backend, integrations, data, and product-oriented frontend).
- API design and contracts (versioning, standards, governance).
- Asynchronous / event-driven systems (queues, workers, background processing).
- Observability and reliability (logs, metrics, traces), performance, and scalability.
- Automation with workflows (n8n, webhooks) and integration with business tools (CRM, forms, messaging, email).
- CI/CD and deployments with a focus on speed, security, and stability.

Although my focus converges towards architecture + automation, I am interested in development when it serves as a lever to reduce technical debt, improve quality, and accelerate growth.

Additionally, I work as a voice actor and dubbing artist, which reinforces a key skill in architecture: communicating technical decisions clearly, aligning stakeholders, and explaining trade-offs without noise.

🎯 Professional Goal: Evolve into a Solution/Technical Architect designing solutions that scale with control, reduce technical debt, and automate operations measurably.

🧰 Usual Stack: Node.js (NestJS), Python (FastAPI), TypeScript/JavaScript, Angular/Nuxt, PostgreSQL/MySQL, Redis, RabbitMQ, Celery, Docker, Linux, CI/CD, n8n.
  • Spanish

    Native or bilingual

  • English

    Conversational

  • Catalan

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • CastelloDaniel
    Solution Architect | Technical Architect | AI & Automation
    TECH
    January 2026 - Today (7 months)
    Valencia, Spain
    I act as a Solution Architect | Technical Architect | AI & Automation with strategic vision, helping companies and startups translate business objectives into robust, scalable, and sustainable technological solutions.

    I participate in roadmapping, risk assessment, and decision-making that impacts growth, costs, and execution capacity. I design architectures with evolution in mind: progressive scalability, technical debt reduction, and alignment between product, technology, and business.

    💡 I understand technology as a strategic lever: good architecture accelerates delivery, reduces operational friction, and allows for confident growth.

    🔧 How I add value

    - Definition of technological strategy and trade-offs (cost, risk, time-to-market).
    - End-to-end architecture design (backend, frontend, integrations, data).
    - REST APIs: contracts, versioning, standards, and governance.
    - Performance, scalability, availability, and reliability (observability: logging/monitoring/tracing).
    - Asynchronous / event-driven architectures: queues, workers, background processing.
    - CI/CD and deployment automation.
    - Technical coordination with stakeholders and teams (criteria, scope, dependencies).

    🚀 My approach

    - Technology in service of business.
    - Structural simplicity.
    - Decisions with real impact.
    - Maintainable and evolvable architectures.

    🧰 Usual Technologies
    Node.js (NestJS, AdonisJS), PHP (Laravel, Spiral), Python (FastAPI, Django), TypeScript/JavaScript, Nuxt.js, Angular, PostgreSQL/MySQL, Redis, RabbitMQ, Celery, Docker, CI/CD, n8n, Linux.
    Python javascript PHP Node.js PostgreSQL
  • Daniel Castelló
    Dubbing and Voice Over | Voice Over (ES/CAT/VAL)
    ENTERTAINMENT AND LEISURE
    January 2026 - Today (7 months)
    Valencia, Spain
    Voice for projects by brands, creators, and companies. I provide voice-over and dubbing with a professional focus: natural interpretation, good diction, rhythm, and intention, adapting the tone to the objective of the content (informative, commercial, emotional, or narrative).

    I work in: neutral Spanish / Castilian Spanish, Catalan, and Valencian.
    Services: commercial and corporate voice-over, narration, digital content, e-learning/presentations, character and fiction dubbing, and pieces for social media and audiovisual content.
    📩 If you need a clear, approachable, and adaptable voice, write to me and I'll propose a tone/style approach based on your piece.
    dubbing dubbing actor Voice Over voice actor
  • CastelloDaniel
    Software Developer
    TECH
    January 2014 - December 2025 (11 years and 11 months)
    Moncada, Spain
    I work as a Software Developer, helping companies and startups turn ideas into robust, scalable, and sustainable digital products.

    I don't just 'code.' I get involved in understanding the problem, proposing a realistic technical solution, and making decisions that avoid unnecessary debt and allow the product to evolve without breaking.

    💡 I believe good engineering is what simplifies, automates, and accelerates business with confidence. That's why I work with a product mindset, focusing on code quality, performance, and maintainability from day one.

    🔧 How I add value

    - Product-oriented backend and frontend development.
    - Implementation of clean architectures and preparation for scaling.
    - Building clear, well-structured, and easy-to-maintain APIs.
    - Automation of deployments and processes to reduce friction and errors.
    - Direct and effective communication with technical and non-technical profiles.

    🚀 My approach

    - Less unnecessary complexity, more real impact.
    - Technical decisions aligned with business objectives.
    - Readable and maintainable code for current and future teams.
    - Fluid collaboration, technical judgment, and responsibility.

    🧰 Usual Technologies
    Node.js (NestJS, AdonisJS), PHP (Laravel, Spiral), Python (FastAPI, Django), JavaScript, TypeScript, Nuxt.js, Angular, PostgreSQL, MySQL, Redis, RabbitMQ, Celery, Octane, Docker, CI/CD, Git, Gitea, Linux, SOLID principles, automation, performance, and scalability.
    Nuxt.js NestJs Git Laravel Node.js

Recommendations

Be the first to recommend Daniel

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • Computer Engineering
    Universitat Politècnica de València
    2016
    Ingeniería Informática, Computer Engineering
  • Master's Degree in Corporate Networks and Systems Integration
    Universitat Politècnica de València
    2013
    Máster en Redes Corporativas e Integración de Sistemas, System, Networking, and LAN/WAN Management/Manager

Skill set

Categories