I will build your custom web app or API with scalable clean architecture

S
santiagolopez24
S
santiagolopez24
Santiago L
build your custom web app or API with scalable clean architecture
Full Screen
build your custom web app or API with scalable clean architecture
Full Screen
build your custom web app or API with scalable clean architecturebuild your custom web app or API with scalable clean architecture

About this gig

Have an idea but don't know where to start? Let's build it together!


We transform business ideas into production-ready software from MVPs and internal tools to full-scale web applications and APIs.


With a development team with extensive experience in Node.js, .NET, Spring Boot, React, and Python, we create fast, easy-to-maintain systems that are ready to adapt to the growth of your business.


What I deliver:

  • Custom web applications (frontend + backend)
  • RESTful APIs and microservices architecture
  • Database design and optimization (PostgreSQL, MongoDB, MySQL, Oracle) - Third-party integrations (Stripe, Twilio, Google, AWS, etc.)
  • Clean Code, SOLID principles, and modern design patterns


Powered by DoubleS Software Solutions I personally lead every project to ensure quality communication and technical excellence. Our team of senior developers accelerates delivery while maintaining code standards.


Perfect for:

  • Startups building their MVP
  • Companies automating internal processes
  • Businesses needing custom integrations
  • Teams requiring technical co-founders or CTO-level guidance


Not sure about scope or cost? Message me I offer free 15-min consultations to align on your needs

  • Programming language

    • C#

  • Expertise

    • Algorithms & Data structures
    • Debugging
    • Security
    • Design
    • Databases

  • Frontend framework

    • React.js
    • Bootstrap
    • Tailwind CSS
    • Next.js
    • Angular

  • Backend framework

    • Spring
    • Node.js
    • Flask
    • Next.js
    • Other

Get to know Santiago L

Santiago L
  • FromColombia
  • Member sinceJul 2025
  • Avg. response time1 hour

  • Languages

    Spanish, English
Fullstack Developer experienced in NodeJs, Spring Boot, .NET, Java, C#, Python, React, and Angular. I focus on building scalable, clean, and maintainable solutions, applying clean architecture, SOLID principles, and clean code practices. Skilled in relational and NoSQL databases, SAP B1 integrations, and effective collaboration within multidisciplinary teams, ensuring organized and efficient project delivery

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