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

Speechify; Lille; Sur place; EUR 50 000 - 70 000; Plein temps

Avantages offerts par ce poste

High-impact role

Collaborative engineering culture

Opportunities for leadership

Flexibility and autonomy

Purpose-driven mission

Résumé du poste

Speechify is seeking a talented developer to lead the design and development of native Windows desktop applications. You will work with Windows App SDK, WinUI, and C#, focusing on building high-quality, accessible software. You’ll collaborate closely with product designers and take ownership of the full development lifecycle.

Join us to shape the future of our Windows products and influence millions of users. This role offers flexibility, autonomy, and opportunities to mentor others, making a real impact in a diverse and inclusive environment.

Qualifications

• 3+ years in Windows desktop application development using Windows App SDK, WinUI, C#, and XAML.
• Deep understanding of Windows application architecture and interop between managed and native code.
• Proven track record in designing, building, and shipping production-quality applications.

Responsabilités

• Lead the design and development of native Windows desktop applications.
• Define best practices for code architecture, performance, and usability.
• Drive accessibility efforts and ensure compliance with relevant frameworks.

Connaissances

Windows desktop application development

C#

XAML

C++

WinUI

Accessibility API experience

Software engineering fundamentals

Mentoring skills

Communication skills

Outils

Testing frameworks

Description du poste

What You'll Do

• Lead the design, architecture, and development of native Windows desktop applications using Windows App SDK, WinUI (or related UI frameworks), C#, XAML, and — when needed — C++.
• Define and enforce best‑practices for Windows desktop development across the codebase: code architecture, performance, memory usage, responsive UI, cross‑version compatibility (Windows 10/11+), and maintainability.
• Drive accessibility efforts: integrate and validate support for accessibility APIs (e.g. Microsoft UI Automation or other relevant Windows accessibility frameworks), ensure UI controls, focus management, keyboard navigation, screen‑reader support, and usability for users with disabilities.
• Collaborate closely with product designers, UX researchers, QA, and other stakeholders to shape feature planning, UI/UX architecture, and long‑term roadmap for the Windows platform.
• Take ownership of full lifecycle of features: conception → design → implementation → testing → release → maintenance. Ensure quality, reliability, and consistency across releases.
• Identify, diagnose, and resolve complex bugs, performance bottlenecks, memory leaks, rendering issues, or compatibility problems — and propose robust architectural or design solutions.

Qualifications

Required

• 3+ years in Windows desktop application development using Windows App SDK, WinUI (or similar), C#, XAML — and ideally additional experience with native Windows code (C++, Win32/WinRT/COM).
• Deep understanding of Windows application architecture, including interop between managed code (.NET) and native code.
• Proven track record of designing, building, and shipping production‑quality desktop applications, with an emphasis on reliability, performance, scalability, and maintainability.
• Strong experience with accessibility APIs on Windows (e.g. Microsoft UI Automation or similar), and a dedication to building accessible and inclusive software.
• Excellent software engineering fundamentals: OOP, design patterns, data structures, algorithms, memory management, multi‑threading or asynchronous programming (where relevant).
• Experience leading technical design, mentoring other engineers, conducting code reviews, and making architecture‑level decisions.
• Strong communication skills; ability to articulate tradeoffs, collaborate with cross‑functional teams, and drive consensus.
• A user‑centric mindset: focus on building polished, intuitive, and accessible experiences for end users.

Preferred / Bonus

• Experience with writing automated tests for UI — unit tests, integration tests, UI automation tests; familiarity with relevant testing frameworks.
• Experience with performance optimization for desktop apps (memory usage, startup time, rendering performance, high‑DPI support, responsiveness under load).
• Experience with localization/globalization, right‑to‑left UI support, internationalization, accessibility for multiple regions.
• Familiarity with telemetry, analytics, crash reporting, logging, and error monitoring in desktop applications.
• Previous experience in shaping CI/CD workflows, release pipelines, and deployment strategies for desktop applications.
• Demonstrated ability to take ownership of feature areas or modules and drive them long‑term, including maintenance, refactoring, and technical debt management.

Benefits

• A high‑impact role: you will define architecture, shape the future of our Windows product, and directly influence what millions of users see and experience.
• A collaborative, flat‑structure engineering culture — you are not just a coder, but a builder and a decision‑maker.
• Opportunities to lead — mentor others, steer technical direction, and grow into broader technical leadership (e.g. Tech Lead, Architect).
• Flexibility, autonomy, and responsibility: you define how to solve problems, own features end‑to‑end, and contribute to long‑term product vision.
• A purpose‑driven mission: building software that’s reliable, accessible, and user‑centered — making a real difference for people.

Equal Opportunity Statement

Speechify is committed to a diverse and inclusive workplace. Speechify does not discriminate on the basis of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or other legally protected status.