Software Engineer (C# / Desktop Systems)

TEKsystems•Vista, CA

3d•Hybrid

About The Position

This role is for a Software Engineer specializing in C# and Desktop Systems, with two openings available. The position is hybrid, located in Vista, CA, with a schedule of 2 days onsite and 3 days remote. It is a contract role with strong long-term potential. The engineer will work on sophisticated Windows desktop software that powers advanced inspection and imaging systems used globally in high-impact environments, focusing on software that interacts with sensors, devices, and complex systems, rather than web development. The team is expanding due to growing product demand and a large, complex codebase, seeking engineers who appreciate depth, longevity, and technical challenges.

Requirements

8+ years overall software development experience
4+ years of C# in production environments supporting products or devices (not web apps)
Strong understanding of object-oriented design and navigating complex codebases
Experience with desktop or client-server applications on Windows
Solid troubleshooting and debugging skills
Familiarity with Agile, TDD, and continuous integration
Ability to produce clear technical documentation
Bachelor’s degree in Computer Science or equivalent experience

Nice To Haves

Multithreading and real-time systems experience
Image processing or computer vision exposure (e.g., OpenCV)
Messaging systems (e.g., RabbitMQ or similar)
Embedded systems, RTOS, or PLC integration
Security-focused software development
Experience refactoring large, legacy systems
Familiarity with WPF / Prism
Algorithm development or strong math/engineering foundation
Interest in AI/ML-enabled tooling or workflows

Responsibilities

Maintain and enhance large-scale Windows desktop applications written primarily in C#
Develop software that interfaces with embedded systems, sensors, PLCs, and hardware devices
Support both new product development and sustainment of existing systems with millions of lines of code
Analyze failures, debug complex issues, and implement durable fixes in a mature codebase
Collaborate daily with Electrical Engineers, Mechanical Engineers, and Scientists
Build and improve services, simulators, diagnostics, and tooling
Contribute to algorithm-driven features involving imaging, signal processing, and data analysis
Participate in Agile workflows: daily standups, backlog-driven work, code reviews, CI, and TDD