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Freelance C# Winforms Developer Jobs (NOW HIRING)

Cohu

Principal SW Engineer

San Diego, CA · On-site

$138K - $186K/yr

Design, develop, test, and integrate machine control software using C++ and C# in a Visual Studio ... WinForms, or Qt); ability to build effective diagnostics and recovery workflows. * Build and ...

New

Leidos

Software Engineer

San Diego, CA · On-site

$69K - $125K/yr

Working knowledge of C/C++ for hardware-focused or embedded applications. * Proven experience with ... Experience developing desktop GUI applications (e.g., WPF, WinForms). * Familiarity with Git-based ...

Leidos

Software Engineer

San Diego, CA

$69K - $125K/yr

Working knowledge of C/C++ for hardware-focused or embedded applications. * Proven experience with ... Experience developing desktop GUI applications (e.g., WPF, WinForms). * Familiarity with Git-based ...

Cohu

Principal SW Engineer

San Diego, CA · On-site

$138K - $186K/yr

Design, develop, test, and integrate machine control software using C++ and C# in a Visual Studio ... WinForms, or Qt); ability to build effective diagnostics and recovery workflows. * Build and ...

New

Cohu

Senior Software Engineer

San Diego, CA · On-site

$125K - $165K/yr

Design, develop, test, and integrate machine control software using C++ and C# in a Visual Studio ... WinForms, or Qt); ability to build effective diagnostics and recovery workflows. * Build and ...

Cohu

Senior Software Engineer

San Diego, CA

$125K - $165K/yr

Design, develop, test, and integrate machine control software using C++ and C# in a Visual Studio ... WinForms, or Qt); ability to build effective diagnostics and recovery workflows. * Build and ...

Hyundai Autoever America

MES Engineer III

Savannah, GA · On-site

$79K - $112K/yr

MES Engineer III Location: Savannah, GA Company Overview Hyundai AutoEver America (HAEA) , the ... WinForms, ASP.NET, HTML5, AJAX, IIS, Windows Server, SQL, and Visual Studio. * Technical Skills:

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Freelance C Winforms Developer information

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How much do freelance c# winforms developer jobs pay per hour?

As of Aug 12, 2026, the average hourly pay for freelance c# winforms developer in the United States is $22.97, according to ZipRecruiter salary data. Most workers in this role earn between $18.75 and $18.75 per hour, depending on experience, location, and employer.

What are some common challenges faced by freelance C# WinForms developers when working with clients remotely?

Freelance C# WinForms developers often encounter challenges such as clarifying client requirements and addressing legacy code in existing applications. Communication can be more complex when collaborating remotely, so it's important to establish clear project milestones and maintain regular updates. Additionally, ensuring compatibility across different Windows environments and handling deployment issues can require extra attention. Building strong client relationships and setting clear expectations from the start can help mitigate these challenges.

What is a freelance C# WinForms developer?

A Freelance C# Winforms Developer is a software professional who specializes in building desktop applications using the Windows Forms (WinForms) framework with the C# programming language. They work independently, providing their services to clients on a project-by-project basis rather than being employed by a single company. Their main responsibilities include designing, coding, testing, and maintaining Windows-based applications, often focusing on user interface design and functionality. Freelance developers typically manage their own schedules, clients, and project scopes.

What is the difference between Freelance C# Winforms Developer vs Freelance WPF Developer?

AspectFreelance C# Winforms DeveloperFreelance WPF Developer
Required SkillsProficiency in C#, Winforms, UI designProficiency in C#, WPF, XAML, UI/UX design
Work EnvironmentDesktop application development for WindowsDesktop application development with advanced UI features
Industry UsageBusiness tools, legacy systemsModern desktop apps, rich interfaces
CertificationsNone specific, general C#/.NET knowledgeSame as Winforms, plus XAML expertise

While both roles involve C# development for desktop applications, Winforms developers focus on traditional Windows Forms interfaces, often for legacy or business systems. WPF developers work on modern, visually rich applications using XAML. The choice depends on project requirements and UI complexity.

What are the key skills and qualifications needed to thrive as a freelance C# WinForms developer?

To excel as a Freelance C# WinForms Developer, you need strong proficiency in C#, .NET Framework, and experience designing and maintaining Windows Forms applications, typically backed by a degree in computer science or equivalent experience. Familiarity with Visual Studio, version control systems like Git, and knowledge of databases such as SQL Server are commonly required technical tools. Excellent problem-solving skills, self-motivation, and effective communication are crucial soft skills for managing client expectations and delivering quality solutions independently. These competencies are essential to create efficient, user-friendly applications and maintain successful client relationships in a competitive freelance environment.
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What cities are hiring for Freelance C# Winforms Developer jobs? Cities with the most Freelance C# Winforms Developer job openings:
What are the most commonly searched types of C# Winforms Developer jobs? The most popular types of C# Winforms Developer jobs are:
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Freelance C Winforms Developer jobs near you
Infographic showing various Freelance C# Winforms Developer job openings in the United States as of August 2026, with employment types broken down into 80% Full Time, 3% Part Time, and 17% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution, with an average salary of $47,772 per year, or $23 per hour.

Principal SW Engineer

Cohu

San Diego, CA • On-site

$138K - $186K/yr

Full-time

Posted 2 days ago

New

Job description


Cohu is a global supplier of semiconductor test and automation equipment. In this role you will build and sustain software that controls complex electro-mechanical test handlers used in high-volume semiconductor manufacturing.
Position Summary
Design and develop proprietary Windows desktop application and framework software for control machines, automation systems, and complex electro-mechanical platforms - including motion controllers, I/O systems, sensors, machine vision systems, robotics, and barcode readers. This role spans full lifecycle development-from architecture and design through integration, deployment, and customer support-focused on uptime, safety, and predictable behavior.
This position is ideal for engineers who enjoy building large software systems that interact with sophisticated industrial equipment.
Essential Functions / Responsibilities
  • Design, develop, test, and integrate machine control software using C++ and C# in a Visual Studio environment.
  • Develop automation software using object-oriented design principles and software design patterns.
  • Integrate motion controllers, I/O systems, machine vision, robotics, sensors, barcode readers, and other industrial devices through vendor-provided Windows APIs and SDKs.
  • Drive system architecture, interface definitions, and software design reviews; establish patterns that scale across product variants.
  • Own customer escalation response: troubleshoot issues using logs, instrumentation, and on-equipment debugging; deliver corrective actions and prevention plans.
  • Partner with Manufacturing and Field Service to resolve production-line and installed-base issues, restore system uptime, and improve reliability.
  • Build verification strategies that push failure detection upstream (simulation, automated system tests, regression suites) and reduce re-occurrence.
  • Interface with customers and cross-functional teams (EE/ME/Test/Apps) to align requirements, integration plans, and release readiness.
  • Mentor engineers through code reviews, design feedback, and technical coaching.

Required Qualifications
  • Bachelor's or Master's degree in Computer Engineering, Software Engineering, Computer Science, Electrical Engineering, or a related field.
  • 15+ years of professional software engineering experience, including substantial work on automation, machine control, or complex electro-mechanical systems.
  • Expert C/C++ skills with object-oriented design (OOD) and design patterns; ability to write maintainable, testable, production-quality code.
  • Strong experience developing on Windows desktop applications using Visual Studio; familiarity with C# for tooling, diagnostics, or UI is preferred.
  • Experience developing multithreaded software and event-driven software.
  • Experience integrating external hardware using Windows APIs, SDKs, or communication libraries.
  • Proficiency with version control and collaborative development workflows (Git preferred): code reviews, branching strategies, and disciplined change management.
  • Demonstrated ability to troubleshoot and resolve field issues, including root-cause analysis and implementing corrective/preventive actions.
  • Strong written and verbal communication skills; comfortable presenting designs and status to technical and non-technical stakeholders.

Relevant Domain Experience (Any of the Following)
  • Semiconductor equipment, test handlers, ATE integration, or factory automation environments.
  • Comparable experience in industrial automation, robotics, medical devices, or high-volume product engineering with electro-mechanical systems.
  • Preferred / Additional Skills (Highly Beneficial for Test Handler Software)
  • State machine development, event-driven software architecture, machine sequencing, hardware integration through vendor API, motion control APIs, machine vision integration.
  • Hardware/software integration experience (MCU/SoC peripherals, serial buses, timing/latency considerations) and familiarity with common interfaces (RS-232/RS-485, USB, Ethernet, TCP/IP, CAN, I2C, SPI).
  • UI development experience for operator/service tools (WPF, WinForms, or Qt); ability to build effective diagnostics and recovery workflows.
  • Build and release tooling: CI/CD pipelines (e.g., Jenkins), automated test execution, packaging/deployment, and traceable release documentation.
  • Experience with factory/equipment communication standards such as SECS/GEM and related SEMI standards (e.g., E5/E30/E37/HSMS) and/or equipment performance tracking.
  • Experience with simulation or hardware abstraction techniques that enable development and testing before hardware availability.
  • Scripting and data analysis for troubleshooting (e.g., Python) and familiarity with issue tracking (e.g., Jira).
  • Understanding of machine safety concepts: interlocks, e-stops, safe-state design, and failure modes; exposure to functional safety standards (e.g., ISO 13849) is a plus.

What Success Looks Like
  • You deliver reliable software that maintains throughput and uptime in production environments.
  • You design scalable software architectures used across multiple products.
  • You reduce escalation frequency by improving diagnosability and recovery behavior.
  • You improve development velocity through pragmatic architecture, automation, and strong engineering hygiene.
  • You mentor engineers and elevate software engineering standards across the organization.
  • You collaborate effectively across disciplines and communicate trade-offs clearly

Job Conditions / Additional Information
Occasional domestic and international travel may be required (approximately 10%).
Work involves extended periods at a computer workstation and may include time in manufacturing areas or at customer sites when supporting escalations.
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About Cohu

Sourced by ZipRecruiter

Industry

Software development

Company size

1,001 - 5,000 Employees

Headquarters location

Poway, CA, US

Year founded

1947

Social media

Twitter

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