Senior Software Engineer, Instrument Control

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. 

As part of our team, your core responsibilities will be:  

• 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. 

Qualifications 

Baseline skills/experiences/attributes: 

• 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. 

Ideally, you also have these skills/experiences/attributes (but it’s ok if you don’t!): 

• 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. 

The estimated base salary range for this role based in the United States of America is: $130,000 - $160,000. Compensation decisions are dependent on several factors including, but not limited to, level of the position, an individual’s skills, knowledge and abilities, location where the role is to be performed, internal equity, and alignment with market data. Additionally, all full-time employees are eligible for our discretionary bonus program and equity as part of the compensation package.  

Quantum-Si does not accept agency resumes. 

Quantum-Si is an E-Verify and equal opportunity employer regardless of race, color, ancestry, religion, gender, national origin, sexual orientation, age, citizenship, marital status, disability or Veteran status. All your information will be kept confidential according to EEO guidelines.