marc@velmer :~$ whoami

Marc Velmer.

I engineer software.

I'm a lifelong learner, a relentless tinkerer, and a backend hacker at heart. I never outgrew the habit of taking things apart just to understand how they work. Now I get to do that professionally.

About Me

Born and raised in Barcelona, I've been obsessed with computers for as long as I can remember — self-taught first, then formally through Computer Engineering.

I started in web development, moved into SaaS at scale, and now work in Web3 and decentralized infrastructure. Along the way I've spent a lot of time on data-heavy systems — moving, modeling, and making sense of large volumes of it.

I care about tech and economics in equal measure: half backend engineer, half long-term investor, fully curious.

Marc Velmer

Where I've Worked

Lead Engineer  @ Vocdoni

  • Worked on the backend and architecture behind a cryptography-based voting system designed to store election processes onchain
  • As lead developer coordinated the web3 SDK design to simplify integration for applications built on top of the protocol
  • Focused on backend reliability, integration points, and productization of decentralized voting infrastructure

What I've Studied

  • Computer Engineering

    Universitat Politècnica de Catalunya  • Barcelona, Spain

    Studied the foundations of computing — architecture, systems, data structures, and databases — building the base I still rely on, and where I found my direction toward software and data.

  • Secondary Education

    Deutsche Schule Barcelona  • Barcelona, Spain

    At the German School of Barcelona I picked up an early love of science and computing — and the chance to learn German.

    I also won two Jugend forscht prizes for a team project called “Program for the Visualization of Equilibrium Chemical Reactions”:

    • Second prize in the Computer Science category at the Nordrhein-Westfalen state competition in 2006
    • First prize in the Computer Science category at the Iberian Peninsula regional competition in 2005, plus a special prize for a two-week internship at the Jülich research center

  • Languages

    Spanish 100%
    Catalan 100%
    English 95%
    German 90%

Some Things I've Built

  • Featured Project

    Vocdoni

    Vocdoni is a voting solution that uses cryptography and stores voting processes onchain, enabling secure, verifiable, and transparent digital elections.

    At Vocdoni, I have been designing and coordinating the Web3 architecture through the SDK, integrating backend services with a ready-to-use library for production voting flows.

    • Web3
    • SDK
    • Cryptography
    • Onchain Voting
    GitHub External Link
    Vocdoni

  • Featured Project

    Aragon DAO

    Aragon DAO is a protocol for building and managing decentralized organizations with onchain governance. I was involved in the design of the new protocol and SDK, helping shape the developer experience around the core Aragon stack.

    The work focused on defining how applications connect to the protocol, so builders could integrate governance features through a ready-to-use SDK instead of assembling everything from scratch.

    • Web3
    • Protocol Design
    • SDK
    • Onchain Apps
    GitHub External Link
    Aragon DAO

  • Featured Project

    FC Barcelona Socis App

    FC Barcelona needed to solve a fragmented digital member experience where different services lived in different apps with disconnected backends. That architecture made cross-service features harder to deliver and created friction for members trying to manage everything from one place.

    As backend developer, I implemented a PHP/Laravel gateway backend that unified multiple internal FC Barcelona systems into one integration layer, powering the Socis app with consolidated, reliable data.

    • PHP
    • Laravel
    • API Gateway
    • Microservices
    • REST
    External Link
    FC Barcelona Socis App

  • Featured Project

    Observatori de Salut

    For the Ajuntament de Barcelona, we turned high-volume public-health CSV data into structured, explorable insight — automating ingestion pipelines in PHP and generating charts, geospatial maps, and statistical summaries for fast, consistent publishing.

    • PHP
    • Data Pipelines
    • Data Modeling
    • Statistics
    External Link
    Observatori de Salut

Other Noteworthy Projects

  • Folder

    Aragon ERH

    A multi-tenant HR SaaS platform (Société Générale, Indigo, others). From Econocom’s Development Excellence Center, I built backend services focused on reliability, integrations, and handling each client’s data and configuration cleanly.

    • PHP
    • REST
    • SaaS
    • CMS
    External Link
  • Folder

    Nuvol

    We rebuilt Nuvol’s platform to modernize a digital newspaper’s cultural section and streamline editorial work. The core challenge was data: migrating a massive article-and-photo catalog, restructuring it, and designing a new database for consistency and growth — plus migrating the user base and subscription billing without disruption.

    • PHP
    • WordPress
    • Content Migration
    • Data Modeling
    External Link
  • Folder

    Exploitative Poker Strategy

    A data-analysis project turning raw poker hand histories into strategy. I built the pipeline to collect and organize opponent data, visualized tendencies in a web app, and used expected-value statistics to define exploitative play, testing it through simulation.

    • Statistics
    • Simulation
    • Data Management
    • Data Extraction
    External Link

What's Next?

Get In Touch

I’m currently open to new opportunities. If you’d like to discuss a role or collaboration, send me a message and I’ll get back to you by email.