~/davidzas $ whoami

I build apps
people love.

David Tobar — Senior Full Stack Engineer & AI Systems Architect. 14+ years shipping for web, cloud, and the App Store. Lately: production AI agent systems with Claude.

14+ yrs AWS · GCP · Azure Claude — advanced iOS · React · Node
01 / babybee — the story

Baby care,
age-aware.

A daily-care companion that computes what matters today from the baby's exact adjusted age — for sleep-deprived parents logging one-handed in the dark.

01 / babybee — the craft
  • One-tap logging in under five seconds
  • Live Activities + watchOS companion
  • Partner sync with push notifications
  • Swift Charts growth analytics
01 / babybee — the stack

Quietly
excellent.

SwiftSwiftUIwatchOSFirebaseStoreKit 2
BabyBee app screenshot
02 / beetransfer — the story

Every pixel,
bit-identical.

Photo and video transfer at full original quality — SHA-256 verified end to end, no recompression, no silent downsampling. P2P nearby, cloud everywhere else.

02 / beetransfer — the craft
  • Per-file SHA-256 integrity, verified on arrival
  • Auto-routing: MultipeerConnectivity or cloud
  • ProRAW, ProRes, and Live Photos intact
  • Share extension + widgets
02 / beetransfer — the stack

Trust,
engineered.

SwiftSwiftUIMultipeerConnectivitySupabaseCryptoKit
BeeTransfer app screenshot
03 / mobeelity — the story

¿Puedo circular
hoy?

One glance answers whether your plate can drive today under Colombia’s rotating Pico y Placa restrictions — with a push alert before you reach the car.

03 / mobeelity — the craft
  • Instant per-plate verdict, Spanish-first
  • Push alerts before restriction windows
  • Bucaramanga + Bogotá rules, always current
  • Admin dashboard keeping rules fresh
03 / mobeelity — the stack

Simple face,
sharp engine.

SwiftSwiftUISupabaseNext.js
Mobeelity app screenshot
~/davidzas $ cat skills.md

Lately: teaching agents to ship.

The last year has been production AI agent systems — multi-agent orchestration, RAG pipelines grounded in proprietary data, and agentic apps deployed to AWS and GCP. Built on 14 years of full-stack engineering across education, e-commerce, and enterprise.

Claude (Anthropic) — advancedMulti-agent orchestrationRAG pipelinesAI workflow automationAWS · GCP · AzureReact · Angular · TypeScriptNode.js · C#/.NETSwift · SwiftUIMongoDB · PostgreSQL
~/davidzas $ git log --experience

14 years of commits.

  1. 2022 — now
    Senior SWE & AI Systems Architect @ Cresteo

    Production AI agent systems on AWS/GCP with Claude, OpenAI, Gemini. Led a 6-person team; shipped Telus Marketplace features at 98% client satisfaction.

  2. 2022 — 2023
    Senior Software Engineer @ Imagine Learning

    Micro-frontends lifting engagement 30%; high-priority bugs down 50%.

  3. 2021 — 2022
    Senior Software Engineer @ Optic Power

    Real-time gaming data APIs; user base up 40%, retention up 35%.

  4. 2020 — 2021
    Senior Software Engineer @ FullStack Labs

    GoDaddy marketing platforms; engagement and revenue up 20%.

  5. 2017 — 2022
    Google Cloud Technical Leader @ Davinci Technologies

    Cloud infrastructure for banking and oil on GCP/AWS; 99.9% uptime, 30% cost savings.

  6. 2016 — 2017
    Systems Professional @ Telebucaramanga Movistar

    Led iOS/Android app direction; drove digital transformation.

  7. 2015 — 2016
    Web Developer @ G&J Corporation

    Built an iOS/Android app connecting soccer players for matches.

  8. 2013 — 2015
    CTO & Co-Founder @ Cofreelancers

    Led engineering as co-founder; client satisfaction up 50%.

  9. 2012 — 2013
    Developer @ Systemico

    Built Likeparrot, an embeddable web chat on XMPP.