Jeremy Callahan

AI Engineering · Mobile & Web Apps · QA Automation

Engineering performance, crafting aesthetic details. Building production mobile apps and AI solutions that scale.

Services

Three ways I help clients ship with confidence

AI Consulting

Forward Deployed Engineer

  • Computer vision: YOLOv8, CoreML, on-device inference
  • Agentic & voice AI integrations
  • Rapid AI-orchestrated delivery

Web & Mobile

Apps & Platforms

  • iOS, Android & cross-platform (Swift, React Native, Capacitor)
  • Web apps, Firebase backends & CI/CD
  • 0-to-1 products & enterprise launches

QA & Test Automation

Manual & Automated Testing

  • Test planning, manual QA & release management
  • Appium, Selenium, XCUITest & Espresso
  • CI/CD: GitHub Actions, AWS Device Farm
View Code Watch Tutorials

Featured Work

Recent projects across AI, mobile, and enterprise

CyR.U.S. AI skincare assistant app

e.l.f. Cosmetics · CyR.U.S.

AI Vision & Voice Skincare Assistant

Built an accessibility-first iOS app that identifies skincare products via a custom YOLOv8n model deployed with CoreML, plus voice-controlled navigation for visually impaired users.

  • YOLOv8
  • CoreML
  • SwiftUI
  • Computer Vision
  • 21-day build

Wellth

Agentic Voice AI in HIPAA Environment

Integrated Crescendo's agentic voice platform into customer service workflows with 99%+ accuracy, serving 200k+ daily active members.

  • Voice AI
  • HIPAA
  • Crescendo

Thrive

AI Coaching App, iOS & Android

Shipped a subscription-based AI coaching app in 34 days with personalized AI-generated coaching and RevenueCat payment integration.

  • iOS
  • AI Coaching
  • RevenueCat
  • 34-day launch

Golf BPM

0-to-1 Mobile & Web Product

First technical hire. Architected iOS, Android, web, and Firebase/GCP backend from scratch. Built community of 21k newsletter subscribers.

  • Firebase
  • GCP
  • iOS
  • Android

Linqto

Fintech Platform at Scale

Led engineering & QA strategy for a private equity investment platform. CI/CD with GitHub Actions, 92% iOS and 89% Android test coverage.

  • Fintech
  • CI/CD
  • Appium
  • API Platform

Sharpen

iOS Development & QA Automation

Built and tested the Sharpen mobile app with end-to-end QA automation across iOS and Android platforms using Selenium and AWS Device Farm.

  • iOS
  • Android
  • AWS
  • Selenium

AMEX

Enterprise Mobile, Technical Lead

Led development and launch of 6+ mobile apps for Fortune 500 clients including Safeway loyalty, Universal Orlando guest experience, and American Express prototypes.

  • iOS
  • Android
  • UX Prototyping
  • Team Lead

Portfolio

Golf BPM

Thrive

Sharpen

Linqto

Brain Body

Wellth

Rank Makers

Safeway

Universal Orlando

About Jeremy


I'm a product-minded engineer who takes ideas from prototype to production across AI, mobile, web, and quality engineering.

I combine hands-on development with design, UX, and product thinking. That rare mix means I can scope a project, build the MVP, and make sure it actually ships.

Recent work includes computer vision apps (YOLOv8 + CoreML), agentic voice AI in HIPAA environments, and 30+ mobile apps for brands like Safeway, Universal Orlando, and American Express.

I use AI-native workflows to compress timelines, launching products in weeks that traditionally take months, without sacrificing architecture or quality.

Flawless Lighthouse scores. Perfect SEO and 100% Agent-Ready.

Traditional SEO gets you indexed. Modern engineering makes you readable to the next generation of AI search and agentic web scrapers.

We hit straight 100s across Performance, Accessibility, Best Practices, and SEO and lock in a perfect 3/3 on Agentic Browsing. If your current build isn't optimized for both human visitors and AI agents, it's already obsolete.

Lighthouse report showing 100 scores for Performance, Accessibility, Best Practices, and SEO, plus 3/3 Agentic Browsing

What Clients Say

Jeremy helped us deliver our mobile Classhoppers experience on time and on budget. There is never any guesswork about scope, cost, or delivery. He communicates clearly and is highly recommended.
Iris Melendez , Founder, Class Hoppers
Working with Jeremy was a breeze for helping create my App to my exact specifications. He helped me make it better than I could have imagined. Their knowledge in the industry makes it so easy on the inventor.
Katherine Foehr , Founder, Property Manager Pro
Thanks for your timely guidance and support throughout this project. I learned a lot from you. Thanks again for your contribution to the success of the team.
Vishnu Kanagal , Lead Android Developer, IBM
It was a pleasure having you on the project. We brought you in at a critical juncture and greatly appreciate your contributions in a short span of time.
Aleena Narayana , Project Lead, IBM

Contact

Schedule a call to discuss your AI prototype, App, Web or Automation project.