©ONE VAREZ
Oscar Nevarez V26.10

Engineering leader

I lead the way digital products are conceived, built and transformed.

19.43 N / 99.13 W · Mexico City Remote · Americas · EN / ES

From the first idea to the platform that runs it: product direction, architecture and hands-on engineering, AI included. You get one person accountable for the result, from day one through every release after.

Work with me See my work
Currently shipping Nullcolor, my screen recorder for Mac and Windows.©2026

Services

Three things I'm hired for

SVC 01
AI document pipelines

Proofs of delivery, invoices, CFDIs, IDs and photos come in from phones and inboxes. Models read them, check them and route them.

You get fewer people retyping documents and faster billing.

  • OCR + LLM extraction
  • Per-document model routing
  • Exception queues for humans
SVC 02
Internal AI agents

An assistant your team asks in Slack. It answers from your own databases and APIs, with permissions and audit logs.

You get answers in seconds instead of a ticket to the data team.

  • MCP servers and tool use
  • Slack and voice interfaces
  • Evals before launch
SVC 03
Cloud and data platforms

Serverless and container platforms on AWS and GCP, written as code, plus analytics your clients can log into.

You get a platform your team can trust in production.

  • AWS · CDK · Lambda · Fargate
  • Athena · Metabase · PostgreSQL
  • Multi-tenant dashboards
REF ONV-SVC3 / 3 listed

Selected work

Running in production

Case 01Logistics

AI for a freight marketplace

ClientKamina GO · Grupo Traxión
RoleTech Lead Manager
5,000+ movements / day

Led technology for a freight marketplace and execution platform inside one of Mexico's largest logistics groups.

  • Mobile proof-of-delivery capture with OCR and AI extraction, feeding invoicing, reconciliation and payment follow-up.
  • Evidence system that reads audio, video and photos and feeds downstream systems.
  • Internal AI agent across datasets and APIs, used from Slack.
  • Multi-tenant analytics on Athena and Metabase.
Case 02Healthtech

From last-mile delivery to digital pharmacy

ClientPrixz
RoleCTO
SectorHealthtech e-commerce

Mexico's first online-only pharmacy: dark-store fulfilment, its own site and app, plus Amazon and Mercado Libre storefronts.

  • Led engineering as the company grew from a last-mile provider into a pharmacy.
  • Owned architecture, platform and hiring.
REF ONV-WRK2 / 2 listed
I also ship my own softwaremacOS · Windows

Unit data label

Nullcolor

KINETO · Compositing frame 019800:00:06:18
Nullcolor frame: exploded view of canvas, shadow, screen recording, cursor highlight, webcam overlay and auto-zoom frameCanvas backgroundDrop shadowScreen recordingCursor highlightWebcam overlayAuto-zoom frameSCREEN RECORDINGAUTO-ZOOM FRAMEWEBCAM OVERLAYCURSOR HIGHLIGHTDROP SHADOWCANVAS BACKGROUND

A native Mac and Windows app that records your screen and webcam together, with a built-in editor and 4K export. It runs on Kineto, a Rust video engine I open-sourced.

Scroll and the playhead records the frame Kineto builds, one layer per track, each wired into the final composite.

Try Nullcolor ↗
Everything I've builtonevarez.dev ↗ Kineto engineGitHub ↗ gh-cms · 179★GitHub ↗
Kineto · Rust · FFmpegConcept drawing

About

Hi, I'm Oscar.

I've written software for more than twenty years, mostly in TypeScript, Node and Python, and lately Rust for desktop apps and AI agents. I was CTO at Prixz and, most recently, Tech Lead Manager at Kamina GO, part of Grupo Traxión.

I work in Spanish and English, remotely with teams across the Americas.

TypeScriptNode.jsPythonRustAWSMCP

Contact

Tell me what you're building.

Send me a few lines about the project and where you're stuck. I reply to every message.

*ONEVAREZ*Every message gets a reply