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Santiago Agustin Ramirez MindelSA

Santiago Agustin Ramirez Mindel

Backend Developer specialized in APIs, SaaS and so

€350/day
Barcelona, ES
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Santiago Agustin

🎯 Backend & SaaS Developer specialized in fast and scalable solutions
I am Santiago Ramírez, a freelance developer based in Barcelona and founder of Quickstack.pro.
I help startups, agencies, and companies build and implement robust backend solutions that connect, automate, and scale.
✔️ Development of efficient and secure RESTful APIs (Python + FastAPI)
✔️ Creation of production-ready custom SaaS platforms
✔️ Dashboards and admin panels for data visualization and management
✔️ System Integration → Stripe, CRM, internal tools
✔️ Deployment and maintenance → Vercel, CI/CD, complete documentation
Results-oriented work, clear deliveries, and post-launch support.
If you need to bring your idea to production or improve your current backend, I can help you.
📬 Available for freelance projects, agency collaborations, or temporary contracts.
  • Spanish

    Native or bilingual

  • English

    Fluent

  • Italian

    Fluent

Can work on-site
Barcelona (up to 50km)

Experience

  • Quickstack.pro
    Freelance Backend Developer & SaaS Solutions Architect
    SOFTWARE PUBLISHING
    December 2024 - Today (1 year and 6 months)
    Madrid, Spain
    Comprehensive development of backend and SaaS solutions for clients and startups in Europe.
    • Design and construction of scalable architectures using FastAPI, PostgreSQL, and cloud systems (Vercel, Docker).
    • Creation of custom SaaS platforms for user management, subscriptions, dashboards, and secure APIs.
    • Development of ClientPortal, a private platform for creative agencies that optimizes project delivery, manages client feedback, and enhances professional image.
    • Integration of automated workflows for continuous deployment (CI/CD) with GitHub Actions.
    • Focus on end-user experience to reduce support costs and facilitate adoption.
    Currently offering flexible solutions for startups, agencies, and businesses across Europe looking to scale their digital operations.
    Back-End development PostgreSQL SaaS Architecture & Development API Security & Authentication Next.js Basic React Vercel GitHub Actions Cloud Deployment UX Focused Development
  • Quickstack.pro
    Freelance Backend Developer | SaaS & API Solutions
    SOFTWARE PUBLISHING
    March 2024 - Today (2 years and 3 months)
    Barcelona, Spain
    Comprehensive development of a SaaS solution for internal process automation in medium-sized companies.
    🔹 Design and construction of a scalable backend with Python (FastAPI) and PostgreSQL, ensuring speed and security.
    🔹 Implementation of a public RESTful API for clients to easily integrate the service into their own platforms.
    🔹 Development of a web Dashboard (Next.js + Vercel) for managing users, subscriptions, and real-time reports.
    🔹 Integration of payment system via Stripe API to automate user sign-ups and renewals.
    🔹 Automatic deployment to production environments using Vercel + GitHub Actions for CI/CD.
    🔹 Complete technical documentation + post-launch support to ensure service continuity.
    Result → SaaS platform operational in production with real users, allowing the client company to save +60% of time on administrative tasks.
    Currently offering similar services for startups, agencies, and companies in Europe seeking custom backend or SaaS solutions.
    Python PostgreSQL API Connections Next.js / Basic React Vercel GitHub Actions
  • Quickstack.pro
    Freelance Backend Developer — QuoteBuilder Web App
    SOFTWARE PUBLISHING
    December 2023 - March 2024 (3 months)
    Barcelona, Spain
    Comprehensive development of QuoteBuilder, a web application for generating real-time custom quotes.
    • Design and development of the backend using Python (FastAPI) for dynamic quote generation logic.
    • Data modeling in PostgreSQL for managing templates, pricing rules, and clients.
    • Development of an administration panel for managing templates and users with restricted access.
    • Integration with a lightweight frontend for quick quote visualization and export.
    • Implementation of automatic deployment to production using Vercel + GitHub Actions.
    • Result → Reduced quote creation time from 40 minutes to less than 5 minutes, significantly increasing sales closing rates.
    Back-End development Database Design API Development & Integration Front-End Development Cloud Deployment Process Automation Client Communication & Agile Iteration

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Education

  • IT Automation with Python
    Google / Coursera
    2025
    Automatización de tareas, desarrollo de scripts, gestión de sistemas, uso de APIs.

Skill set

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