.NET Developer

About the job .NET DeveloperLocation: Neenah, WI (Onsite 5 days a week)Duration: 4-5 month contractAbout the RoleWe're looking for a Senior .NET / WPF Developer to join an onsite team building and enhancing a laboratory information management and instrument integration system. You'll own the development of a complex desktop application spanning instrument communication, data processing workflows, and reporting - working directly with engineering, product, and QA stakeholders in an Agile environment. If you thrive in device-connected, data-intensive environments and enjoy solving real-world integration challenges, this role is worth a close look.Key ResponsibilitiesApplication Development (approx. 80%)Design and develop a WPF-based desktop application using a modular, scalable architectureBuild and enhance workflows supporting lab data capture, calibration, measurement, review, and reportingImplement multithreading and async programming patterns for real-time instrument interaction and responsive UI behaviorDevelop data access, offline data handling, synchronization, and upload capabilitiesEnable data export, reporting, and printing functionalitiesDevice & Instrument Integration (approx. 20%) Implement device integration frameworks for multiple laboratory instruments and peripheral devicesDevelop device management and configuration modules, including health checks, status monitoring, thresholds, and communication settingsHandle serial communication and device connectivity using COM protocols, device APIs, and SDKsCollaboration & Quality Partner with engineering, product, and QA teams on architecture, testing strategy, and deployment planningPerform end-to-end validation, integration testing, and issue resolution across device and application workflowsQualifications Required 5-8 years of software development experienceStrong proficiency in WPF and desktop UI developmentSolid experience with C# and .NET Core / .NET FrameworkHands-on experience with serial communication and COM port-based integrationsStrong understanding of multithreading and async programming using Task and async/awaitExperience integrating hardware devices through APIs, SDKs, or communication protocolsKnowledge of database access technologies such as ADO.NET or ORMsExperience with modular application architecture and desktop application designStrong problem-solving and debugging skills in device-connected environmentsPreferred Experience with laboratory systems, scientific instruments, or embedded device integrationsFamiliarity with LIMS workflows, sample/result handling, or regulated lab environmentsKnowledge of NI libraries or equivalent integration frameworksExperience with installer creation and deployment packagingExposure to offline-first applications and sync mechanisms Fluid thanks you for your interest in this opportunity. However, only candidates with the required qualifications will be contacted. Fluid adheres to the principles of equal employment opportunity and affirmative action. We welcome and encourage diversity in our workplace. Candidates must be eligible to work in the United States.