Matias Sieff

    I build the systems your business needs.

    I understand how your business works, find what can be improved, and build a simple solution that helps your team work better.

    13+ years of experience
    80+ projects shipped
    Available worldwide
    Matias Sieff, independent software engineer
    Available

    Have a question about your project or about me?

    I'll answer right now

    Quick questions:

    Can you build a mobile app?
    How do we get started?
    What does it cost?

    How I can help

    Software for the work you actually need to get done.

    You do not need to have the technical answer. Start with what is difficult today, and we’ll work out a practical next step.

    01

    A new product

    Have an idea? We’ll define a useful first version, build it and learn from real users.

    02

    A system for your business

    Make an important part of your business easier to manage, for your team or your customers.

    03

    An internal tool

    Replace spreadsheets and repetitive work with a simple system your team can actually use.

    04

    Technical support

    Get experienced help with a difficult decision or bring an existing product back on track.

    Selected work

    A few things I’ve helped build.

    A few examples of products I have helped build. The work is always different, but I start the same way: understand the people and the problem first.

    Sports / B2B
    Adopted by clubs

    World Padel Rating

    I work across the product: backend, club management platforms, the player app and new features. My role has grown into full-product ownership as the platform continues to evolve.

    View project
    Entertainment / Consumer
    +100k downloads

    Ricardo Arjona’s Official App

    I was involved from the beginning, building the native Android app and coordinating with iOS, backend and design. It offered premium content, music and exclusive experiences, and evolved for more than six years.

    View project
    Construction / Enterprise
    Multi-country rollout

    CrewCenter · Hilti Group

    The work started with a technical review of an existing Android product. After the recommendations were well received, I helped implement them, collaborate with the international team and keep improving the product.

    View project
    Fintech
    2M users

    Lemon Cash

    I worked on the home experience and security features such as multi-factor authentication, device checks, liveness verification and video password recovery.

    View project

    How I work

    A simple way to move from problem to product.

    01

    Talk it through

    You tell me what is happening. I ask questions, listen and help clarify the real need.

    02

    Plan the right first version

    We agree on what to build, how we’ll approach it, how long it should take and what it costs.

    03

    Build and launch

    I do the work and keep you informed with regular, understandable updates.

    04

    Keep improving

    After launch, we use what we learn to decide what deserves attention next.

    About Matias

    One experienced person who can see the whole picture and do the work.

    I’m Matias, a software engineer from Patagonia, Argentina. I’ve spent 13+ years working on more than 80 products for founders, companies and teams around the world.

    Learn more about me

    Real experience, direct collaboration

    You work directly with me: from understanding the need to launching and continuing to improve the system.

    What would you like to improve?

    Tell me what is happening, what you would like to change, or what you are thinking about building. We can start there.

    Start a conversation