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Senior Software Engineer, Windows/Desktop Applications - Lille, France

speechify

Backend Full-time Permanent Lille, France

Job details

Not specified Salary
Lille, France Eligibility
Senior Experience
Full-time Employment

About this role

Role overview A senior engineering role focused on a Windows desktop reading application used by millions of people worldwide. The product converts written content, such as documents, articles, and books, into audio to help users read faster and learn more easily. You will act as a technical lead within a fully distributed engineering organization, shaping the Windows platform end to end.

Responsibilities - Own the design, architecture, and development of native Windows applications using Windows App SDK, WinUI, C#, XAML, and C++ where appropriate - Define and uphold engineering standards covering code structure, performance, memory usage, responsive UI, cross-version compatibility on Windows 10 and 11, and long-term maintainability - Lead accessibility work by integrating Microsoft UI Automation and similar frameworks, ensuring screen reader, focus management, and keyboard navigation work reliably - Collaborate with product designers, UX researchers, and QA on roadmap planning, UI architecture, and feature design - Take features through the full lifecycle from concept and design to implementation, testing, release, and ongoing maintenance - Investigate and resolve complex bugs, performance bottlenecks, memory leaks, rendering problems, and compatibility issues

Requirements - Three or more years building Windows desktop applications with Windows App SDK or WinUI, C#, and XAML, plus comfort with native Windows code such as C++, Win32, WinRT, or COM - Deep understanding of Windows application architecture and managed-to-native interop via .NET - History of shipping production-grade desktop software with a focus on reliability and scalability - Practical experience with Windows accessibility APIs and a commitment to inclusive design - Strong fundamentals in object-oriented design, design patterns, data structures, algorithms, memory management, and asynchronous programming - Demonstrated ability to lead technical design, mentor engineers, run code reviews, and make architecture-level decisions - Clear communication skills and a user-centric mindset

Nice to have - Automated UI testing experience across unit, integration, and end-to-end layers - Performance tuning work on startup time, high-DPI rendering, and responsiveness under load - Localization, globalization, and right-to-left UI support experience - Familiarity with telemetry, crash reporting, logging, and error monitoring in desktop applications - Experience shaping CI/CD workflows and release pipelines for desktop software

Benefits and work setup - High-impact role shaping architecture for a product used by millions - Collaborative, flat engineering culture with strong decision-making autonomy - Pathway into broader technical leadership, including tech lead or architect tracks - Flexible, fully remote work arrangement with end-to-end ownership of features - Salary range for France-based candidates: 30,000–100,000 USD per year, plus bonus and equity, depending on experience

Skills detected in the listing

C#C++Stakeholder Management
Detected Sep 2, 2026
Last verified Sep 2, 2026
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