Senior Software Engineer, Instrument Control

Quantum-Si Incorporated • Branford, CT

68d • $130,000 - $160,000

About The Position

We are looking for an experienced and ambitious instrument control software engineer to join our instrument software team. We're developing a next-generation system built on a modern, tiered architecture using .NET C# on Linux. Hardware components are integrated through standard communication protocols and emphasize orchestration over low-level control. The system also includes capabilities for cloud connectivity, secure software updates, and performance monitoring. Note: While some responsibilities involve supporting our current product line, the primary focus is on delivering the new platform.

Requirements

• Bachelor's degree in Computer Science, Electrical Engineering or a related discipline.
• 5+ years of experience delivering production software in C#.
• Proficiency with Linux.
• Proven ability to design multithreaded systems, state machines, and robust error handling for real-world hardware.
• Strong testing discipline and practical debugging skills across process boundaries and I/O layers.
• Demonstrated ability to design scalable software architectures and produce clear, comprehensive technical documentation.
• Excellent collaboration and communication with cross functional engineering teams.

Nice To Haves

• Experience with hardware communication and device integration (e.g., serial/RS-485, I2C, command-response patterns, timeouts/retries).
• Experience shipping desktop UIs (preferably Avalonia or similar MVVM frameworks) and instrument/operator workflows.
• CI/CD for multiprocess systems, containerization, and artifact management.
• Python scripting for automation and control logic.
• C++ experience to support the existing product line.

Responsibilities

• Design, develop, and maintain services and libraries for a tiered instrument control architecture on Linux using .NET (C#), with an emphasis on reliability, safety, and clear separation of concerns.
• Build a modern UI for instrument operation, status, alerts, calibration, and service workflows; contribute reusable components and MVVM patterns.
• Integrate cloud connectivity for data transfer, configuration, logs, fleet health, and remote diagnostics.
• Capture and query metrics and logs to drive observability, performance tuning, and field reliability.
• Create hardware simulators, fakes, and automated integration tests to enable CI for device workflows without physical hardware.
• Improve operational excellence via health checks, watchdogs, software updates, safety interlocks, failure-mode handling, and on-instrument diagnostics.
• Provide targeted sustaining support for the existing product line (triage, small fixes, backports) while prioritizing new-platform delivery.
• Document software designs, code, and processes for clarity and maintainability.
• Collaborate across engineering, data science, and image analysis teams to translate complex requirements into well-integrated solutions.

Benefits

• Discretionary bonus program
• Equity as part of the compensation package

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Industry: Publishing Industries
• Education Level: Bachelor's degree
• Number of Employees: 101-250 employees