emerson lopes

senior software engineer · são paulo, brazil

i build software for the people buying and selling homes, and the agents who guide them. mostly react and react native on the front, node and a federated graph underneath. lately that means real‑time collaboration and the ai features in a crm.

my side projects have one user each: the music player on my phone, the dictation tool at my desk, the bot in my discord server. when a tool i rely on breaks, i send the fix upstream instead of working around it.

• tuna

  an offline-first android music player. every track you play is cached in full, so offline playback needs no download step, and eviction never touches liked songs, playlists, or the queue.

• win-text-inject

  a rust crate that delivers text into the focused windows app and restores the clipboard only after the target has actually read it, so slow apps stop receiving your previous clipboard.

• four ways to break a five-line cmd script

  a duplicate /d flag in fnm's cmd hook, and why the obvious fixes all fail: parentheses, setlocal, and goto each break batch in a different way.
• retries make chat messages twins

  a mobile client on a bad network will send your mutation twice. idempotency keys are the boring, correct fix, and the details are where the work is.
• the corruption came from the search

  an unreproducible corruption bug in openplc editor, and what happens when a decorated html string becomes an element's identity.