Theodore S.

I’m a Master’s in Computer Science candidate (graduating Dec 2025) with a 100% 5-star Upwork record. I build production-ready cross-platform mobile and web apps. What I build • React Native / Expo apps (iOS & Android) with auth, payments, push notifications, offline sync, analytics • MVP and Production React / Next.js full stack web apps with complex business logic • AI features: in-app chatbots, retrieval-augmented generation (RAG) over documents, voice agents with coherent text-to-speech, content moderation, and lightweight on-device ML flows • Store delivery: TestFlight / App Store / Play Console setup, versioning, CI/CD Selected work • Privacy Calling App — Privacy focused calling app for Upwork client with authentication, real time calling, contact management, and advanced security features (TestFlight and EAS Build for Android)-- currently in testing for the client. Project delivered significantly ahead of schedule and under budget. • Mental Atlas — AI-powered learning app (TestFlight and EAS Build for Android) with integrated chatbot, RAG, and voice agent; full-stack build with in-app payments and friends feature • Vivid Vocab — language-learning app published on the App Store (in-app monetization) • EdTech platform — in development, competing with Canvas/Blackboard (multi-role, assignments, grading) • ML project — predictive models for career analysis (feature engineering + evaluation) • Delivered a $1,300 client project 30% ahead of schedule Credibility • 6 clients, 100% job completion, all 5★ reviews • MS in Computer Science (completing Dec 2025); focus on ML & distributed systems Typical pricing - Hourly: $28 - Fixed: estimate how many hours it will take and multiply by $28 Process - I make sure we have a well defined spec - I build the spec accurately, keeping you in the loop and delivering early or on time - I take feedback and iterate until the scope defined in the spec is completed - if it’s an MVP, the website is live or your build is on TestFlight or on Android. If it’s a production app, it’s on the App Store and/or the Play Store I look forward to working with you!