Ulises Rosas

Full-Stack Engineer

MAXPRO

Jul 2020 - Present • 6 yrs 1 mo

Fitness platform: web admin, push notification service, and iOS/Android app. Stack: TypeScript, Ionic, Node.js, n8n, Bluetooth, Sentry, CI/CD - Owned the iOS/Android app and Bluetooth device data capture end to end, contributing across the full lifecycle from requirements to store release. - Reduced end to end release time from 8 weeks to 3 weeks across 14 releases in 12 months by adopting automation, streamlined deployments, and AI assisted workflows. - Grew monthly active users from 4,400 to 5,000 (+10%) with AI personalized in app recommendations, measured by higher plays and consumption of recommended content. - Built a model agnostic recommendation layer in n8n, decoupled from the app, integrating Gemini 2.5, GPT-4.1-mini, and Deepseek. - Introduced Sentry plus stronger QA standards and continuous deployment protocols, driving error detection and resolution from user reported to near immediate.

Co-founder & Chief Technology Officer

Sahuaro Labs LLC

Jan 2015 - Present • 11 yrs 7 mos

Co-founded a boutique remote software studio delivering full-stack, mobile, and web products for U.S. and LATAM startups. Hands-on engineer across the full SDLC while leading distributed, cross-functional teams (designers, mobile and web developers). - Led delivery of 5 end to end client products, 4 on time and within budget and scope; the 5th shipped after an unplanned scope expansion. - Shortened typical feature release cycles from 1-3 months to 3-4 weeks by introducing mentorship, code reviews, and shared architectures across teams. - Cut production defects 50% and release cycle time 20% across 3 client products over a 12 month window, standardizing error tracking, CI/CD, and automated deployment tooling. - Increased client revenue and active users while lowering infrastructure costs through continuous integration/deployment, automated releases, and in house analytics. - Improved user retention by building in app messaging and supporting marketing campaign tooling.

Mobile Engineer

JoeCo Ltd

May 2024 - Mar 2025 • 10 mos

IoT companion app tied to a host device (max 10 concurrent users). Stack: TypeScript, MQTT, GitHub Actions, E2E Testing, Sentry - Reduced crashes 50% and improved MQTT reliability 65%, validated across 10 concurrent sessions at the host device limit. - Handled high throughput MQTT traffic (10-15 packets/sec) with background processing and queue based delivery. - Built 3 automated tests for repetitive tasks such as packet validation, plus 1 end to end suite, cutting total test time 40%. - Automated publishing with GitHub Actions, reducing release time from 1 hr to 15 min. - Shipped to the Apple App Store and Google Play; the app serves 50+ active users, each paired to a distributed device.