Sergio Medina
I buildAI automation systemsPassionate full-stack developer with 7+ years of experience building scalable web applications and AI-powered solutions. Specialized in React, Node.js, and modern cloud technologies.
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About Me
Get to know me better
I am a developer focused on practical solutions that combine automation, artificial intelligence and modern web technologies. My work centers on helping businesses increase revenue, reduce operational costs and save time through custom systems that improve outreach, sales processes and internal workflows.
My Approach: I believe in writing clean, maintainable code that scales. I'm a strong advocate for test-driven development and continuous integration. My experience spans from startups to enterprise companies, giving me a unique perspective on different development methodologies and best practices.
What I Do: I specialize in building full-stack applications using React, Next.js, and Node.js. Recently, I've been focusing on integrating AI capabilities into web applications, leveraging technologies like OpenAI's GPT models and TensorFlow. I'm also experienced in cloud infrastructure, particularly AWS and Vercel.
When I'm not coding, you can find me contributing to open-source projects, writing technical blog posts, or mentoring aspiring developers. I'm always excited to learn new technologies and share knowledge with the community.
Work Experience
My professional journey
AI Solutions & Automation Freelancer
Sergio Medina - AI Automation Systems
•freelanceFounded and operate a freelance consultancy specialising in AI-driven outreach and automation solutions. One flagship service is the “Deep Personalization Cold Outreach System”, which automates data collection, hyper-personalised content generation, and scaled messaging for lead-engagement optimisation, leveraged in AI.
Education
My academic background
Bachelor’s Degree in Data Science and Artificial Intelligence
Universidad Politécnica de Madrid
Computer Science
Achievements & Honors
- ▸Awarded Honors in Databases I
IB Diploma
International Baccalaureate
Science and Mathematics
Achievements & Honors
- ▸7/7 Mathematics Analysis and Approaches HL
- ▸7/7 Physics HL
- ▸7/7 Chemistry SL
Featured Projects
Some of my best work
Cold Email Outreach Tool/SaaS (Work in progress)
Platform that automates cold outreach at scale with personalized sequencing and lead management to boost replies and conversions.
Skills & Expertise
A comprehensive overview of my technical proficiencies and tools I work with daily
Ai Ml
3Ai Tools
1Backend
8Cloud
4Database
4Design
2Devops
5Frontend
8Mobile
2Soft Skills
6Testing
2Tools
1Certifications
Professional credentials and certifications
September 27, 2025
CERTIFICATE
for
Cambridge English: B2 First (FCE)
Internationally recognized certification demonstrating upper-intermediate proficiency in English.
Cambridge English
Services
What I can do for you
Featured Services
Full-Stack Web Development
Build modern, scalable web applications from concept to deployment using cutting-edge technologies.
I specialize in building complete web applications using the latest technologies and best practices. From responsive frontend interfaces to robust backend APIs and database design, I handle every aspect of your web application development needs.
Key Features:
- Responsive, mobile-first design
- RESTful API development
- Database design and optimization
- User authentication and authorization
- Real-time features with WebSockets
- Payment integration (Stripe, PayPal)
- SEO optimization
- Performance optimization
- Comprehensive testing suite
- Deployment and DevOps setup
Pricing
Pricing varies based on project complexity, features, and timeline. Contact for detailed quote.
Timeline
4-12 weeks depending on scope
Technical Consulting & Architecture
Expert guidance on technology strategy, architecture decisions, and best practices for your projects.
Get expert advice on your technology decisions, system architecture, and development strategy. I help companies make informed technical decisions that align with their business goals.
Key Features:
- System architecture review
- Technology stack recommendations
- Code review and quality assessment
- Performance optimization strategies
- Scalability planning
- Security audit
- DevOps workflow optimization
- Team training and mentorship
- Migration planning
- Best practices implementation
Pricing
Hourly rate for consulting sessions. Package deals available for ongoing engagements.
Timeline
Flexible, based on consulting needs
All Services
API Development & Integration
Design and build robust RESTful and GraphQL APIs with comprehensive documentation.
- RESTful API design and development
- GraphQL API implementation
- API documentation (Swagger/OpenAPI)
Pricing based on API complexity and number of endpoints.
⏱️ 3-8 weeks
E-Commerce Solutions
Build complete e-commerce platforms with payment processing, inventory management, and analytics.
- Product catalog management
- Shopping cart functionality
- Payment gateway integration
Custom pricing based on features and scale. Includes initial setup and training.
⏱️ 6-12 weeks
Performance Optimization
Speed up your web applications and improve user experience through comprehensive optimization.
- Performance audit
- Frontend optimization
- Backend optimization
Fixed price for audit and optimization based on application size.
⏱️ 2-4 weeks
Get In Touch
Wherever you are in the world, let's work together on your next project.
, 
& ☕, by Sergio Medina.