Sergio Xalambrí

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What I’m doing now

Updated Living in Lima, Peru

This is what has my attention these days, the update I’d give a friend I haven’t seen in a year.

Work

  • Daffy

    I’m a web developer at Daffy, a donor-advised fund that helps people give to the causes they care about, building the web app at the center of the product.

Building

  • Everything on Remix v3

    I’m rebuilding the apps I run on Remix v3 in one public monorepo: this blog, an uptime monitor, a feed reader, a multi-tenant identity provider and the site for my React Router OAuth2 Handbook.

  • The @sdxc packages

    The small libraries those apps share, built on Web Platform APIs: authentication, jobs, mail, feeds and a growing list of standards, with guides at sdxc.dev and a command line that creates and checks apps built with them.

  • Encore

    A music party card game for iPhone, iPad, Apple Watch and Mac: gather friends, reveal a card, and sing a song that fits the challenge.

Writing and speaking

  • The Remix Way

    My talk at Remix Jam 2026 in Toronto, also written up here, on building apps from small packages around shared contracts.

  • Tutorials

    Step-by-step guides to what the packages make possible, most recently a command-line tool with @sdxc/cli and an MCP server for a Remix v3 app.

Open source

  • Remix Auth and Remix Utils

    Keeping both working for the Remix and React Router apps that depend on them.

  • Remix

    Contributing to the framework and its packages as v3 takes shape.