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# Senior Software Engineer

- **Company:** Lumilens Inc.
- **Location:** San Jose, CA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Microsoft Windows, Software Applications, Unit Testing, Bash Shell, C Sharp (Programming Language), Network Sockets, Concurrent Computing, Continuous Integration, Software Debugging, Dependency Injection, Document-Oriented Databases, IEEE-488, Github, Hardware Design, Hardware Interface Design, Python (Programming Language), Windows Presentation Foundation, MongoDB, Model View ViewModel, Object-Oriented Software Development, Windows PowerShell, Mstest, Remote Infrastructure Management, Serial Communications, Software Engineering, Test Execution Engine, Management of Software Versions, Multithreading, Test Scripts, Git, Xunit, Pytest, Deployment Automation, Industrial Software
- **Published:** July 19, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=b9a9b9ce4fd3eeb3

## About the Role

* 5+ years of C#/.NET - experience with GUI (WPF or similar framework), MVVM, async/await, thread safety, and class library design
 * Strong command of concurrent programming - designing thread-safe systems, avoiding race conditions, and reasoning about execution across multiple threads and processes
 * Experience with .NET 8 or later
 * 3+ years of Python - OOP, pytest, abstraction-driven design
 * Solid understanding of clean architecture - separation of concerns, dependency inversion, dependency injection, and testability
 * MongoDB or similar document database - data modeling, querying, and managing test results at scale
 * Analytical mindset - proven ability to break down complex multi-component failures, trace issues across process boundaries, and design reliable solutions under ambiguity
 * Ability to debug remotely without direct debugger access - diagnosing issues via logs, traces, and telemetry

Infrastructure & Tooling

 * Git & CI/CD fluency - GitHub Actions, artifact pipelines, versioning strategies, and automated deployment to remote Windows machines
 * Bash and/or PowerShell scripting for automation, remote management, and deployment
 * Systems-level thinking

Nice to Have

 * Experience with test and measurement instruments (oscilloscopes, spectrum analyzers, power meters)
 * Experience with Unit Tests: xUnit, MSTest, etc.
 * Knowledge of optical communications, photonics, or transceiver technology
 * Python.net experience
 * Familiarity with hardware interfaces - serial communication, TCP sockets, low-level protocols and interfaces (I2C, GPIB), and instrument communication standards (SCPI, VISA)
 * Familiarity with factory/manufacturing software or MES integration

## Description

What You Will Work On

 * C# / .NET desktop application - Advanced manufacturing software for optical transceiver testing. A GUI application built with MVVM architecture, featuring multi-threaded test execution, instrument resource management, and RPC services.
 * Hardware integration - Writing drivers and control code for laboratory equipment, managing parallel test execution and handling complex locking across instruments.
 * Python test scripts & libraries - Our manufacturing software draws the best from both worlds. You will have the opportunity to integrate complex testing functionality based on Python code embedded natively into the .NET application.
 * Manufacturing scale - You will be developing software that runs on manufacturing lines, producing thousands of units daily.


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