Cross-platform applications

Interfaces built across mobile and web, with backend context.

Sean McDonnell’s project experience includes Kotlin and Jetpack Compose, Swift and SwiftUI, Dart and Flutter, React Native, React, and backend-connected interfaces. The strongest current public engineering evidence is documented in Python, Rust, and TypeScript projects; Kotlin is also represented in confidential delivered work.

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01Implemented capabilities

Technologies used in working projects

The strongest public evidence remains backend, developer tooling, and retrieval; mobile frameworks broaden the implementation range.

Android

Kotlin & Jetpack Compose

Interface and workflow implementation, including a confidential multi-component applied-AI system connected to Python services.

Apple

Swift & SwiftUI

Native interface architecture, local data flows, utility concepts, and application prototypes across Apple platforms.

Flutter

Dart & Flutter

Cross-platform application structure, state-driven interfaces, and backend-connected project work.

React Native

JavaScript mobile interfaces

Component-based cross-platform interface work alongside broader TypeScript and React experience.

Web

React & Next.js

Operator dashboards and workflow interfaces connected to FastAPI and data services.

Product thinking

Human-centered workflows

Requirements discovery, clear states, explicit approval points, accessibility, error handling, and documentation.

02Evidence boundaries

An honest statement of depth

Substantial project experience.I have built with these languages and frameworks; they are not keyword-only résumé entries.
Published record.12 applications published on Apple’s App Store through NextEleven. No downloads, revenue, ratings, users, retention, adoption, or current availability of every application is claimed.
Lead stack stays clear.Python, Rust, and TypeScript are my strongest current public evidence; Kotlin is particularly relevant through confidential delivered work.
Role fit.This range is useful in implementation, support, integration, and product-engineering roles where problems cross client, interface, API, and backend boundaries.

Discuss the system or the engineering behind it.

For a technical role, implementation engagement, or focused engineering discussion, contact Sean directly and identify the project that brought you here.

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