I'm Manuel Castillejo,
a Software Engineer & CTO based in Spain.

I'm Manuel Castillejo,
a Software Engineer & CTO based in Spain.

Im Manuel
Im Manuel
Im Manuel

Latest Projects

My vision

From engineering scalable platforms to shaping product vision, I lead with curiosity, precision, and a passion for building digital products that make a real impact.

Combining technology, philosophy and lean methodologies

Creating products to amplify human capabilities

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Years of Experience

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Years of Experience

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Years of Experience

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Successful Projects

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Successful Projects

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Successful Projects

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Awards Winning

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Awards Winning

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Awards Winning

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Experience

2025– Now

CTO

UNSENT

Led the development of an AI-driven platform for emotional processing and digital storytelling, architecting a secure, scalable environment that integrates private LLMs, advanced emotional mapping, and immersive user experiences.

2025– Now

CTO

UNSENT

Led the development of an AI-driven platform for emotional processing and digital storytelling, architecting a secure, scalable environment that integrates private LLMs, advanced emotional mapping, and immersive user experiences.

2025– Now

CTO

UNSENT

Led the development of an AI-driven platform for emotional processing and digital storytelling, architecting a secure, scalable environment that integrates private LLMs, advanced emotional mapping, and immersive user experiences.

2024– 2025

CTO

CoNest

Chief of Technology for CoNest a startup focused in the creation of a sustainable environment of coliving between student and seniors. My work was to build a scalable digital environment that could give support to both parts.

2024– 2025

CTO

CoNest

Chief of Technology for CoNest a startup focused in the creation of a sustainable environment of coliving between student and seniors. My work was to build a scalable digital environment that could give support to both parts.

2024– 2025

CTO

CoNest

Chief of Technology for CoNest a startup focused in the creation of a sustainable environment of coliving between student and seniors. My work was to build a scalable digital environment that could give support to both parts.

2020-Now

Software Engineering Student

ETSII

Developed advanced skills in full-stack development, database management, AI integration, and agile methodologies through academic projects and real-world applications, with a focus on building scalable, user-centered digital solutions.

2020-Now

Software Engineering Student

ETSII

Developed advanced skills in full-stack development, database management, AI integration, and agile methodologies through academic projects and real-world applications, with a focus on building scalable, user-centered digital solutions.

2020-Now

Software Engineering Student

ETSII

Developed advanced skills in full-stack development, database management, AI integration, and agile methodologies through academic projects and real-world applications, with a focus on building scalable, user-centered digital solutions.

2022-2023

Game Developer

Freelance

Designed and developed interactive experiences combining engaging gameplay mechanics, storytelling, and immersive visuals, delivering custom games from concept to deployment for diverse clients and platforms.

2022-2023

Game Developer

Freelance

Designed and developed interactive experiences combining engaging gameplay mechanics, storytelling, and immersive visuals, delivering custom games from concept to deployment for diverse clients and platforms.

2022-2023

Game Developer

Freelance

Designed and developed interactive experiences combining engaging gameplay mechanics, storytelling, and immersive visuals, delivering custom games from concept to deployment for diverse clients and platforms.

2021-2022

Junior Software Developer

ETSII

Built and maintained web applications for research and educational projects, integrating front-end interfaces with back-end services and databases, while applying agile practices and ensuring usability for academic stakeholders.

2021-2022

Junior Software Developer

ETSII

Built and maintained web applications for research and educational projects, integrating front-end interfaces with back-end services and databases, while applying agile practices and ensuring usability for academic stakeholders.

2021-2022

Junior Software Developer

ETSII

Built and maintained web applications for research and educational projects, integrating front-end interfaces with back-end services and databases, while applying agile practices and ensuring usability for academic stakeholders.

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My Services

CTO

I lead the technological vision and strategy of the company, ensuring that every technical decision aligns with business goals. I oversee software architecture, infrastructure scalability, security standards, and the integration of emerging technologies such as AI, automation, and cloud solutions. I build and guide high-performance development teams, foster innovation, and ensure that technology becomes a driver of efficiency, growth, and competitive advantage.

Graphic design

CTO

I lead the technological vision and strategy of the company, ensuring that every technical decision aligns with business goals. I oversee software architecture, infrastructure scalability, security standards, and the integration of emerging technologies such as AI, automation, and cloud solutions. I build and guide high-performance development teams, foster innovation, and ensure that technology becomes a driver of efficiency, growth, and competitive advantage.

Graphic design

CTO

I lead the technological vision and strategy of the company, ensuring that every technical decision aligns with business goals. I oversee software architecture, infrastructure scalability, security standards, and the integration of emerging technologies such as AI, automation, and cloud solutions. I build and guide high-performance development teams, foster innovation, and ensure that technology becomes a driver of efficiency, growth, and competitive advantage.

Graphic design

Project Manager

I plan, execute, and deliver projects with precision, ensuring that timelines, budgets, and quality standards are consistently met. I coordinate cross-functional teams, manage risks proactively, and maintain transparent communication with stakeholders. My approach blends agile methodologies with lean principles, ensuring adaptability, efficiency, and measurable results throughout the project lifecycle.

A man with long hair is working on a computer.

Project Manager

I plan, execute, and deliver projects with precision, ensuring that timelines, budgets, and quality standards are consistently met. I coordinate cross-functional teams, manage risks proactively, and maintain transparent communication with stakeholders. My approach blends agile methodologies with lean principles, ensuring adaptability, efficiency, and measurable results throughout the project lifecycle.

A man with long hair is working on a computer.

Project Manager

I plan, execute, and deliver projects with precision, ensuring that timelines, budgets, and quality standards are consistently met. I coordinate cross-functional teams, manage risks proactively, and maintain transparent communication with stakeholders. My approach blends agile methodologies with lean principles, ensuring adaptability, efficiency, and measurable results throughout the project lifecycle.

A man with long hair is working on a computer.

BPM

I analyze, design, and optimize business processes to reduce inefficiencies and improve operational performance. I implement process automation where possible, ensuring seamless integration between departments and tools. My focus is on creating standardized, scalable workflows that enhance productivity, ensure compliance, and free up resources for high-value activities.

Abstract illustration of a network of connected icons

BPM

I analyze, design, and optimize business processes to reduce inefficiencies and improve operational performance. I implement process automation where possible, ensuring seamless integration between departments and tools. My focus is on creating standardized, scalable workflows that enhance productivity, ensure compliance, and free up resources for high-value activities.

Abstract illustration of a network of connected icons

BPM

I analyze, design, and optimize business processes to reduce inefficiencies and improve operational performance. I implement process automation where possible, ensuring seamless integration between departments and tools. My focus is on creating standardized, scalable workflows that enhance productivity, ensure compliance, and free up resources for high-value activities.

Abstract illustration of a network of connected icons

Consultant

I provide expert guidance tailored to the company’s specific challenges and goals. I conduct in-depth assessments of technology, operations, and strategy, then deliver actionable recommendations. My consulting style is practical and results-oriented, helping the company make informed decisions, embrace innovation, and implement solutions that generate sustainable growth and measurable ROI.

Abstract dark blue and brown waves

Consultant

I provide expert guidance tailored to the company’s specific challenges and goals. I conduct in-depth assessments of technology, operations, and strategy, then deliver actionable recommendations. My consulting style is practical and results-oriented, helping the company make informed decisions, embrace innovation, and implement solutions that generate sustainable growth and measurable ROI.

Abstract dark blue and brown waves

Consultant

I provide expert guidance tailored to the company’s specific challenges and goals. I conduct in-depth assessments of technology, operations, and strategy, then deliver actionable recommendations. My consulting style is practical and results-oriented, helping the company make informed decisions, embrace innovation, and implement solutions that generate sustainable growth and measurable ROI.

Abstract dark blue and brown waves

Framer developer

A Framer developer specializes in building interactive and visually stunning digital experiences using Framer, a powerful design and prototyping tool. Combining creative design principles with advanced coding skills, they craft responsive websites, animations, and prototypes that bring ideas to life. With a focus on seamless interactions and performance, Framer developers bridge the gap between design and development, enabling teams to iterate quickly and deliver polished, user-centric products.

Abstract dark blue and brown waves

Awards & Achievements

1st Place & Cybersecurity Prize

Startup Weekend

I co-created an innovative mobile app that uses AI-driven natural language processing to interpret and respond to the behavioral signals, habits, and needs of pets. The project combined animal care expertise with advanced conversational AI to give pet owners actionable insights and personalized recommendations, strengthening the human-animal bond

1st Place

Scopely Game Jam

I created high-quality, optimized 3D assets that brought the game’s world and characters to life under tight time constraints. I collaborated closely with designers, developers, and artists to ensure visual coherence, gameplay integration, and performance optimization across platforms. My work balanced creativity with technical precision, contributing directly to the immersive experience that secured the project’s victory in the competition.

Best Project

Youth Hackathon

I developed a platform that enables discreet, secure, and anonymous communication in sensitive contexts using end-to-end encryption and privacy-focused design principles. The solution integrated intuitive UX with robust backend architecture, ensuring both accessibility and data protection.

University of Seville

Software Engineer English Degree

I developed a comprehensive understanding of core computing disciplines—from programming, algorithms, and data structures to systems architecture and discrete mathematics. I mastered software engineering methodologies including requirements engineering, system design, testing, and configuration management, while also gaining insights into emerging areas like AI, modelling, simulation, and visualization

University of Lund

Ethics on AI

I deepened my understanding of the ethical complexities that AI brings to modern societies. I examined algorithmic bias and surveillance, explored how AI influences democratic processes, reflected critically on the notion of artificial consciousness, and confronted questions of responsibility and control in autonomous systems.

Frequently Asked Questions

What kind of clients do you typically work with?

I work with a wide range of clients, from startups and small businesses to creative professionals and established brands. Whether you're launching something new or want direction to make your product scalable through technology.

How long does a typical project take?

Timelines vary depending on the project’s complexity, but most scalable applications take between 4–10 weeks from initial architecture to deployment. I’ll provide a detailed roadmap and milestones after our first technical consultation.

What is your pricing structure?

Pricing is based on the scope and complexity of the project. After discussing your goals, I’ll send you a custom quote with clear deliverables and milestones.

Can you scale or rebuild my existing platform?

Absolutely. I can assess your current platform’s architecture, identify bottlenecks, and either optimize or fully rebuild it to ensure scalability, security, and long-term maintainability while minimizing downtime.

Do you offer ongoing support after launch?

Yes. I offer ongoing maintenance, performance monitoring, feature updates, and technical support packages to ensure your platform remains secure, efficient, and aligned with your evolving needs after launch.

What kind of clients do you typically work with?

I work with a wide range of clients, from startups and small businesses to creative professionals and established brands. Whether you're launching something new or want direction to make your product scalable through technology.

How long does a typical project take?

Timelines vary depending on the project’s complexity, but most scalable applications take between 4–10 weeks from initial architecture to deployment. I’ll provide a detailed roadmap and milestones after our first technical consultation.

What is your pricing structure?

Pricing is based on the scope and complexity of the project. After discussing your goals, I’ll send you a custom quote with clear deliverables and milestones.

Can you scale or rebuild my existing platform?

Absolutely. I can assess your current platform’s architecture, identify bottlenecks, and either optimize or fully rebuild it to ensure scalability, security, and long-term maintainability while minimizing downtime.

Do you offer ongoing support after launch?

Yes. I offer ongoing maintenance, performance monitoring, feature updates, and technical support packages to ensure your platform remains secure, efficient, and aligned with your evolving needs after launch.

What kind of clients do you typically work with?

I work with a wide range of clients, from startups and small businesses to creative professionals and established brands. Whether you're launching something new or want direction to make your product scalable through technology.

How long does a typical project take?

Timelines vary depending on the project’s complexity, but most scalable applications take between 4–10 weeks from initial architecture to deployment. I’ll provide a detailed roadmap and milestones after our first technical consultation.

What is your pricing structure?

Pricing is based on the scope and complexity of the project. After discussing your goals, I’ll send you a custom quote with clear deliverables and milestones.

Can you scale or rebuild my existing platform?

Absolutely. I can assess your current platform’s architecture, identify bottlenecks, and either optimize or fully rebuild it to ensure scalability, security, and long-term maintainability while minimizing downtime.

Do you offer ongoing support after launch?

Yes. I offer ongoing maintenance, performance monitoring, feature updates, and technical support packages to ensure your platform remains secure, efficient, and aligned with your evolving needs after launch.

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