Custom Software
Development of web platforms tailored to each company's needs.
- Client portals
- Internal tools
- Management systems
- Dashboards
- MVPs for startups
Joan Puig
Freelance Full Stack Developer in Barcelona
I build web applications and automations for businesses
I help SMEs and startups digitize processes with custom software, APIs, and AI.
Services
Custom software to digitize your business. Development of web platforms tailored to each company's needs.
AI & Automation
AI integration and automations to reduce manual work and improve processes.
- AI chatbots
- Document processing
- Content generation
- Workflow automation
- AI model integration
System Integration
I connect platforms and services to eliminate manual work and errors.
- REST APIs
- Payment gateways
- CRMs
- ERPs
- Tool integrations
Technical Maintenance
Deployment, stability, and continuous maintenance of applications.
- Docker
- Linux servers
- CI/CD
- Backups
- Monitoring
Experience
Full Stack Developer · 2.5 years of experience
Proferox Invest SL
Full Stack Developer
January 2025 — January 2026
- Developed a SaaS with Laravel, Next.js and Django, covering frontend, backend, payment gateway, and deployment architecture.
- Integrated AI features with OpenAI API to automate repetitive tasks and improve internal workflows.
- Set up Docker and GitHub Actions to standardize environments and automate deployments with CI/CD.
b2b.studio
Full Stack Developer
May 2023 — December 2024
- Developed a SaaS with Laravel and Vue.js, covering the entire tech stack from scratch.
- Built corporate websites and e-commerce with WordPress and WooCommerce for industrial clients.
- Implemented Docker to standardize development and production environments.
Portfolio
AI-powered budget generator SaaS
Problem
Businesses and freelancers waste time creating quotes manually.
Solution
I developed a SaaS that automatically generates budget presentations using AI, integrating Laravel, Next.js and Django.
Results
Based on the input data, the system generates a professional quote in presentation format, saving hours of manual work.
Technologies
Session Scheduler
Problem
Organizing sessions for events (therapies, workshops, classes) is time-consuming because schedules and each participant's needs must be coordinated manually.
Solution
I developed an application that automatically generates a monthly session schedule, assigning participants based on their preferences and availability. The system considers 12 constraints and 4 objectives to optimize the calendar. It was built with Next.js, Django and PostgreSQL, and uses Google's ortools library to solve the optimization problem. It includes an AI chat that allows interacting with the application via an MCP hosted in the API.
Results
The system generates nearly infinite schedule combinations with a single click, saving several hours of manual work per session.
Technologies
Lead Classificator
Problem
Small businesses and freelancers get contact-form submissions, but someone has to manually read each one, figure out what service the prospect wants, reply, and track where each lead stands. It's tedious, slow, and things fall through the cracks.
Solution
I built a full-stack automation pipeline. A visitor fills out a contact form, the submission hits an n8n webhook, and an LLM classifies the lead by service type — web development, automation, AI, or maintenance. The lead is stored in PostgreSQL, the visitor gets a confirmation email, and the team is notified on Telegram. A dashboard lets you browse, filter, and move leads through a status pipeline (new → contacted → qualified → closed). Everything is session-scoped, no signup required.
Results
Zero manual triage. A form submission turns into a classified, stored, notified, and trackable lead in seconds, without a human touching anything.
Technologies
Technologies
Frontend
Backend
DevOps
AI
Have a project in mind?
I'm available to collaborate with startups, SMEs, and teams that need to develop or improve their digital products.
Send email