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Senior Software Engineer, Windows/Desktop Applications - Osaka, Japan

Speechify - Remote - Remote - posted 2025-12-02

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Speechify is a text-to-speech platform used by over 50 million people to convert PDFs, books, Google Docs, news articles, and websites into audio. The company was named Chrome Extension of the Year by Google and received Apple's 2025 Design Award for Inclusivity. With ~200 employees distributed globally and no physical office, Speechify operates a fully remote engineering culture. You will lead the design, architecture, and development of native Windows desktop applications using Windows App SDK, WinUI, C#, XAML, and C++ as needed. Your responsibilities include defining and enforcing best practices for Windows desktop development across the codebase—covering code architecture, performance, memory usage, responsive UI, cross-version compatibility (Windows 10/11+), and maintainability. A key focus area is accessibility: you will integrate and validate support for Windows accessibility APIs (Microsoft UI Automation), ensure proper UI controls, focus management, keyboard navigation, screen-reader support, and usability for users with disabilities. You'll collaborate closely with product designers, UX researchers, QA, and other stakeholders to shape feature planning, UI/UX architecture, and the long-term Windows platform roadmap. You will own the full lifecycle of features from conception through design, implementation, testing, release, and maintenance, ensuring quality, reliability, and consistency. You'll identify, diagnose, and resolve complex bugs, performance bottlenecks, memory leaks, rendering issues, and compatibility problems, proposing robust architectural solutions. Required qualifications include 3+ years of Windows desktop application development with Windows App SDK, WinUI, C#, and XAML (plus ideally native Windows code experience). You need deep understanding of Windows application architecture, including interop between managed (.NET) and native code. You must have a proven track record shipping production-quality desktop applications emphasizing reliability, performance, scalability, and maintainability. Strong experience with Windows accessibility APIs and dedication to inclusive software is essential. You should have excellent software engineering fundamentals, experience leading technical design and mentoring engineers, strong communication skills, and a user-centric mindset. Preferred qualifications include experience with automated UI testing, performance optimization for desktop apps, localization/globalization, telemetry and analytics, CI/CD workflows for desktop applications, and demonstrated ability to own feature areas long-term.

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