Joshua Companion
Mobile & Full-Stack Engineer with 6+ production React Native apps shipped to iOS and Android. From health tech and clinical trials to fintech and AI — I build, own, and ship mobile products end-to-end.
Featured Projects
A selection of applications I've architected and developed, from React Native mobile apps to AI-powered platforms.
HubaVet
React Native telemedicine app with real-time WebRTC video consultations, monorepo architecture, and OTA updates for veterinary care.
SF Study - Parent Hub
React Native clinical research app with phase-gated task management, session recording, and a Next.js admin dashboard for researchers.
Olympus AI
React Native fitness tracking app with Arduino hardware integration, AWS backend with GraphQL API, and real-time workout data syncing.
Penny
React Native subscription tracking app with Plaid integration, email alerts for price changes, and automated duplicate charge detection.
StoryHero
React Native mobile app using AI to create personalized bedtime stories for children with custom characters and AI-generated illustrations.
Cardtoplease
React Native + web app that turns photos into AI-generated greeting cards with OTA updates, Stripe payments, and a credits-based model.
iBorrowed Marketplace
React Native marketplace app with geolocation-based item discovery, push notifications, and in-app messaging.
PouncerAI
Chrome extension leveraging AI technology to automate Upwork proposal generation, serving thousands of active users with 99%+ uptime.
Pouncer Profile Optimizer
AI-powered Upwork profile analyzer that helps 1,000+ freelancers boost rankings and win more jobs.
Volcon 3D Configurator
Interactive 3D vehicle builder that improved conversion by 25% and eliminated $160k in licensing costs.
Volcon Website
Complete digital presence for electric vehicle company, including website, mobile app backend, and Stripe payment integration.
Betweened
Social media platform focused on educational and age-appropriate content for tweens with AI-powered content moderation.
Work Experience
A journey through my professional experience, leading teams and building impactful products across diverse industries.
Full Stack Engineer
Building the platform behind AutoHDR, an automated real estate photography editing tool. Full-stack development across web and backend with AI-powered image processing pipelines.
Key Achievements:
- •Built end-to-end ML inference pipeline with containerized model serving on AWS
- •Managed cloud infrastructure migration from GCP to AWS (S3, EC2, Kubernetes)
- •Full-stack development across Next.js frontend and Python backend
- •Contributing to Chrome extension serving 5,000+ active users
Technologies:
Lead Mobile & Full Stack Engineer
Led development of 6+ React Native + Expo mobile applications shipped to both App Store and Google Play. Built apps spanning health tech (HubaVet telemedicine, D-Fusion clinical trials), fintech (Penny subscription tracker), AI (StoryHero, Olympus AI), and marketplace (iBorrowed). Owned the full mobile lifecycle from architecture to deployment.
Key Achievements:
- •Shipped 6+ React Native + Expo apps to App Store and Google Play across health, fintech, and AI domains
- •Built HubaVet telemedicine app with real-time WebRTC video consultations and appointment scheduling
- •Developed D-Fusion clinical research app + Next.js admin dashboard for researchers to review recordings and export reports
- •Built Olympus AI fitness tracking app with Arduino hardware integration, GraphQL via AWS Amplify, and DynamoDB backend
- •Architected monorepo with Turbo modules sharing code between React Native mobile and Next.js web
- •Implemented OTA updates, React Navigation, and push notifications across all mobile apps
Technologies:
Lead Engineer
Led development of PouncerAI, an AI-powered Chrome extension for automated Upwork proposal generation serving thousands of active users. Drove architecture decisions, feature development, and product growth.
Key Achievements:
- •Led migration from Plasmo to custom Chrome Extension architecture for improved performance
- •Built real-time feature toggle system with granular user segmentation
- •Designed AI-powered content generation pipeline using OpenAI API
- •Architected seamless browser integration with robust error handling
- •Established development workflows enabling rapid feature iteration
Technologies:
Senior Front-End Engineer
Sole developer responsible for creating and maintaining the complete Volcon website, digital presence, and mobile application backend infrastructure.
Key Achievements:
- •Engineered backend infrastructure for Volcon mobile application
- •Integrated Stripe payment processing for vehicle preorders
- •Led technology adoption initiatives improving productivity by 40%
- •Optimized website performance and user experience
- •Established development best practices and coding standards
Technologies:
About Me
Passionate about building scalable applications that solve real problems and enhance user experiences.
I'm a Mobile & Full-Stack Engineer with 4+ years shipping production React Native apps across iOS and Android. I've built and launched 6+ React Native + Expo apps to both app stores, spanning health tech, fintech, AI, and e-commerce.
My expertise spans the full mobile stack — React Navigation, OTA updates, push notifications, GraphQL and REST APIs, real-time features like WebRTC video and WebSockets, state management (Zustand, MobX, Redux), and local storage (MMKV, AsyncStorage). I've worked across monorepo architectures with Turbo modules, CI/CD pipelines with EAS Build, and testing with Jest and Maestro.
Based in Austin, Texas, I thrive as the go-to mobile developer on a team — taking ownership, driving architecture decisions, and shipping features that delight users on every platform.
Mobile
State & Storage
Frontend
Backend & APIs
Testing & DevOps
AI & Tools
Get In Touch
I'm always interested in discussing new opportunities, collaborating on innovative projects, or simply connecting with fellow developers.