What I build | Stavros Pachoundakis [Stavros.](/)/[Projects](/projects)/[What I build](/brands)/[About](/about) Human/Agent Based in Montréal ================= What I build: mobile apps, AI products and the systems behind them. From the first screen to the App Store: native and cross-platform apps, AI inside the product, and the code and design systems that keep them running. [[![](/reels/DayWfroSnrM.webp)](/reels/DayWfroSnrM-preview.mp4)](projects.local.html)People using the apps**200M+**Companies built for**30+**Mobile stacks**5**Webby Awards**2** The need, what I built, and the result.The need, what I built, and the result. ------------------------------------------------------------------------------------------ Four things I build, each with a real example and the facts behind it. ![](/brands/higgsfield.svg) ### Mobile apps The need Apps that millions of people open every day, on iOS and Android. What I built I lead mobile teams from the first architecture to the store release, with one shared design system across every app of a brand. * iOS and Android * Webby Awards The result **2** Webby Awards : 2 Webby Awards : 24 Mobile stacks I build in ![](/brands/replit.svg) ### Security and sign-in The need Sign-in, payments and accounts that pass a security review, built to WCAG 2.2 AA. What I built I build passkey and FIDO2/WebAuthn sign-in, Okta and OAuth2 flows, remote deposit capture and Apple Pay with PCI tokenization, on iOS and Android. * FIDO2/WebAuthn * Remote deposit capture * Okta The result **2** sign-in standards, OAuth2, OIDC and FIDO2 : 12 Platforms, iOS and Android : 2 Sign-in standards ![](/brands/huggle.svg) ### Shared code and design systems The need One codebase for logic and one design system, instead of two of everything. What I built I share the domain and data code between iOS and Android with Kotlin Multiplatform, about 80% of it on one large app, and build white-label design systems that launch a new brand in weeks. * Kotlin Multiplatform * Design systems The result **80%** shared code, iOS and Android : 80% Shared code : 1 Month to a first white-label release ![](/brands/tripo.webp) ### AI inside apps The need AI features that ship inside real apps, with a clean API behind them. What I built I build AI-ready design systems with Figma MCP, MCP-ready APIs, on-device recommendations and classification with Core ML and TensorFlow Lite, and LangGraph multi-agent systems with RAG, with an evaluation gate before every model change. * Figma MCP * Core ML * TensorFlow Lite * LangGraph * RAG * MCP servers The result **2** on-device ML frameworks : 2 On-device frameworks : 75+ People using an agent system I built The numbers ----------- Facts from my work history. Based in Montréal. ### The workAcross all roles People using the apps I worked on : 200M+ Companies built for : 30+ Webby Awards : 2 MCP tools on this site : 11 ### DeliveryRecent roles Code shared between iOS and Android, about : 80% Test coverage in a SwiftUI modernization, at least : 80% Month to a first white-label release, about : 1 People using an agent system I built, over : 75+ Platforms per shared Kotlin Multiplatform core : 2 ### ReachPlatforms and places Mobile stacks : 5 Sign-in standards : 3 AI runtimes, cloud and on-device : 4 On-device AI frameworks : 2 Languages : 3 : 200M+ people use the apps I worked on : 30+ companies built for : 5 mobile stacks I build in : 2 Webby Awards **80%**shared code Who I build for ---------------- Apps people rely on every day, with AI inside that they can trust. 200M+ people use the apps I worked on, all built to WCAG 2.2 AA. * iOS and Android * Flutter and React Native * Kotlin Multiplatform * Accessibility, WCAG 2.2 AA * On-device AI * Design systems ### What I build with * Cross-platform stacks**3** * Native platforms**2** * Cloud AI platforms**2** * Agent framework, LangGraph**1** * Evaluation gate per model change**1** Counted from the stacks and standards I ship with. More screens from the workMore screens from the work ---------------------------------------------------- Three screens from apps I have worked on. [[![](/reels/Dd9N_S8SgCV.webp)](/reels/Dd9N_S8SgCV-preview.mp4)Flight status**Realtime**](projects.local.html)[[![](/reels/Dcz6R_aS0Av.webp)](/reels/Dcz6R_aS0Av-preview.mp4)Doors and amenities**Theming**](projects.local.html)[[![](/reels/DcpulL0y4SH.webp)](/reels/DcpulL0y4SH-preview.mp4)Portfolio**Data**](projects.local.html) SpecialtiesSpecialties ---------------------- * **Real time**Live flight tracking with Live Activities and Dynamic Island, plus Apple Wallet boarding passes. * **Offline-first apps**Sync that survives dropped connections, with conflict resolution. * **Bluetooth and devices**Bluetooth Mesh and BLE for emergency lighting and inventory systems. * **Payments**Apple Pay with PCI tokenization, and remote deposit capture. * **Accessibility**WCAG 2.2 AA across iOS and Android, with VoiceOver, TalkBack and Dynamic Type. * **Testing and releases**Automated UI tests, CI/CD pipelines and production monitoring. How I workHow I work ---------------------- 1. *01***Brief**You tell me the product, the users and what has to ship first. 2. *02***Plan**You and I agree the architecture, the platforms and what to share between them. 3. *03***Build**I build and review every step with the team, with tests and monitoring from the start. 4. *04***Ship and support**The app goes live through CI/CD, and telemetry shows how it behaves in production. Included as standardIncluded as standard ---------------------------------------- * WCAG 2.2 AA accessibility**Included** * Automated tests and CI/CD**Included** * Monitoring and telemetry**Included** * Shared Kotlin Multiplatform modules**Negotiable** * On-device AI (Core ML, TensorFlow Lite)**Negotiable** PricingPricing -------------- Shared on request, after a first call about scope. A single engineer or a small team, depending on the project. [Ask for a quote](https://stavrospachoundakis.com/contact) Start a project I'm building a mobile app for my customers, and want it live this month / next month / I'm flexible. Opens the contact page with your brief filled in. Send to Stavros ↗ Prefer to write? [Use the contact page](https://stavrospachoundakis.com/contact) · Based in Montréal, working with teams anywhere · All the work is on [Projects](/projects) [GitHub](https://github.com/stavroschios)[LinkedIn](https://linkedin.com/in/stavrospachoundakis)[Contact](https://stavrospachoundakis.com/contact)[Privacy](/privacy)[Developers](/developers)