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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Application Engineer (Web & Cross-Platform) - **Company:** ZeroEyes, Inc. - **Location:** Conshohocken, PA, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Flutter, Computer Animation, Microsoft Windows, Application Programming Interfaces (APIs), Artificial Intelligence, Android Software Development, Apple IOS, Apple Mac Systems, C++ (Programming Language), Cloud Computing, Profiling, Software Quality, Code Review, Databases, Continuous Integration, Command-Query Responsibility Segregation (Software Development), Software Design Documents, Linux, Protocol Buffers, Graphical User Interface, Design of User Interfaces, Human-Computer Interaction, Python (Programming Language), Routing, OAuth, OpenID, Qt Modeling Language (QML), Qt (Software), RabbitMQ, Svelte, Responsive Web Design, Software Engineering, SQLite, Data Streaming, TypeScript, Management of Software Versions, Web Content Accessibility Guidelines, Web Applications, WebSocket, WebRTC, Data Logging, ReactJS, Cypress (Programming Language), Caching, Backend, Vue.js, Modularization, Material UI, Integration Tests, Playwright, Real Time Data, Build Tools, Figma, Dart, Event Sourcing, Api Design, Api Gateway, Multiplatform - **Published:** November 11, 2026 - **Apply:** https://www.careerbuilder.com/job-details/senior-application-engineer-web-cross-platform-conshohocken-pa--dea4ffb4-2bdb-48de-bb45-f7418fb20bf8 ## About the Role Software Engineering, Multiplatform/Cross-Platform, Firearms Experience, Artificial Intelligence (AI), Qt GUI (Graphical User Interface) Toolkit, Multiplatform/Cross-Platform, Software Engineering, User Interface/Experience (UI/UX), Cloud Computing, Mentoring, * 6-10+ years shipping production apps; multiple launches across web and at least one native platform. * Deep experience with Flutter (widgets, isolate usage, build/layout perf, platform channels) and Qt/QML (signals/slots, model-view, QtQuick, C++ bridges). * Strong web fundamentals (TypeScript, modern build tools, state management, routing) and familiarity with one major framework (React/Vue/Svelte). * Demonstrated UI/UX excellence: component libraries/design systems, accessibility (WCAG), responsive design, motion/animation, and design-tool fluency (Figma/Sketch). * Messaging & data: WebSockets/gRPC/Protobuf, streaming APIs, caching, offline sync; understanding of eventual consistency and conflict resolution. * Cloud-aware client engineering: practical use of pub/sub (e.g., RabbitMQ), API gateways, and auth flows; comfortable reading cloud diagrams and proposing client-side impacts. * Strong testing chops: unit, widget, and end-to-end (Flutter integration tests, Playwright/Cypress), CI pipelines, feature flagging, and analytics instrumentation. * Solid engineering practices: clean architecture, DI, modularization, performance profiling, code reviews, strong Python skills for backend services. * Clear, candid communicator; comfortable writing design docs and ADRs; proven mentoring of other engineers., * Must be authorized to work in the U.S. Ability to obtain and maintain a Public Trust or other clearance may be required. ## Description We're hiring a Senior Application Engineer who can ship beautiful, high-performance apps across web and native platforms. You'll lead UI architecture and implementation, build cross-platform clients (primarily Flutter but also possibly Qt/QML and other frameworks), and design efficient messaging and cloud integration patterns. We value people who care more about truth than winning arguments, mentor generously, and take personal responsibility for the organization's success. What you'll do * Contribute to the client application architecture for web and desktop/mobile (Windows, MacOS, Linux, iOS, Android). * Build great UIs: Design systems, component libraries, responsive layouts, accessibility, smooth animation, and state management. * Cross-platform development with Flutter/Dart and possibly other frameworks like Qt/QML (C++/QML), plus selective native interop (platform channels/FFI) where performance or hardware access demands it. * Web application engineering using a modern stack (e.g., React/Vue/Svelte, TypeScript), with SSR/CSR as appropriate and strong routing/state patterns. * High-performance messaging: architect and implement real-time data paths (WebSockets) with back-pressure, reconnection, and offline/edge sync strategies. * Cloud integration patterns: apply pragmatic designs (pub/sub, CQRS, event sourcing, circuit breaker, bulkhead) for resilient clientservice workflows. * API design & contracts: collaborate on REST schemas, versioning, and client SDKs; enforce typed contracts and compatibility. * Performance & reliability: profiling, memory/CPU/network tuning, video frame budget discipline, error handling, diagnostics, and telemetry. * Security by default: OAuth2/OIDC, secure local storage/Keychain/Keystore, code-signing, auto-update channels, and privacy-aware logging. * Mentor & multiply: run design reviews, raise code quality, and level up teammates across UI/UX, testing, and performance., * Desktop packaging & updates (MSIX/Winget, DMG/Notarization, AppImage/Snap), mobile store pipelines, and enterprise distribution (MDM). * Media-heavy or real-time apps (WebRTC, low-latency rendering, GPU-accelerated widgets). * Edge or offline-first patterns; local databases (SQLite/Isar/Realm) and sync engines. * Tauri/Electron, WebAssembly, or Rust/C++ interop for hot paths. * Observability in clients (OpenTelemetry), feature telemetry, and growth experiments (A/B, UX metrics). Values * No jerks * Be authentic * Be effective * Attention to detail * All in, all the time