Senior Desktop Engineer_AI - AQM

Join us in bringing joy to customer experience.  Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.    Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together.

We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.  Role Overview Build a high-performance, desktop screen recording platform that operates reliably at the system level across operating systems. This role focuses on deep OS integration, screen capture pipelines, performance optimization, and robust desktop architecture, with Windows as the primary platform and macOS/Linux as secondary targets.

You will work extensively with OS level APIs, managing multi-display environments, and building reliable screen capture pipelines that integrate seamlessly with browser extensions, web surfaces, and backend services.

Key Responsibilities

Application Development Design, develop, and maintain a cross-platform desktop screen recording application for Windows/Mac/Linux. Implement reliable screen capture pipelines using native OS APIs. Build robust configuration and control mechanisms suitable for enterprise deployments. Develop and maintain installers and packaging for Windows, macOS, and Linux.

Integrate the desktop application with browser extensions (Chrome/Firefox) and web interfaces for recording control and state sync. System Integration & Performance Optimize recording workflows for low CPU, memory, and disk overhead, even during long sessions. Work with Windows native APIs for screen capture, window enumeration, display detection, and system resource management.

Handle complex multi-monitor setups, DPI scaling, resolution changes, and dynamic display reconfiguration. Implement structured logging, diagnostics, and crash reporting to support observability at scale. Collaborate with backend teams to ensure reliable chunked uploads, retries, and fault tolerance during recording sessions.

Quality & Maintenance Write unit, integration, and system-level tests for critical desktop components. Debug and resolve platform-specific issues, with deep ownership of Windows-related problems. Participate actively in design reviews and code reviews, raising the bar on system reliability. Maintain clear technical documentation for installation, customer onboarding, configuration, and operational behavior.

Technical Stack Languages Rust / Go / C / C++ or other native desktop/system programming languages Platforms Windows (Primary), macOS, Linux APIs & System Interfaces Windows screen capture and graphics APIs Core Audio APIs, platform-specific screen/audio libraries OS-level windowing, display, and process APIs Integration REST APIs, WebSockets Browser extension ↔ desktop IPC mechanisms Packaging & Distribution Windows installers (MSI / EXE) macOS/Linux packaging workflows Required Qualifications 3+ years of experience in desktop application development.

Strong proficiency in at least one native/system programming language (Rust / Go / C / C++ / ElectronJS). Strong experience with Windows development and native APIs (Win32/UWP). Experience building low-level, performance-sensitive systems (screen capture, rendering, process, audio I/O or resource management). Knowledge of video and audio encoding (WebM, VP8/VP9, Opus).

Familiarity with desktop application packaging and distribution, especially on Windows/Mac. Excellent debugging skills with the ability to reason about OS-level failures and edge cases. Bonus: Audio recording, audio processing, and performance optimization knowledge. Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills.

The more inclusive we are, the better we are. Five9 is an equal opportunity employer.  View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal.   Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Five9, Inc., together with its subsidiaries, provides cloud software for contact centers in the United States and internationally. The company offers virtual contact center cloud platform that delivers a suite of applications, which enables the breadth of contact center-related customer service, sales, and marketing functions.

Its solution enables its clients to manage these customer interactions across various channels, including voice, video, chat, email, website, social media, click-to-call,...