We are currently looking for an experienced UiPath Custom Activity Developer for a 2-month contractual engagement. This opportunity is ideal for professionals with deep expertise in building advanced UiPath activity packages and designing robust, reusable components within the automation ecosystem. Role Overview: The selected candidate will be responsible for developing custom UiPath activities and WPF/XAML-based designers, working extensively with Windows Workflow Foundation, and ensuring high-performance, maintainable code using C#/.NET. Key Responsibilities: Design and implement UiPath Activity Libraries using Windows Workflow Foundation Develop WPF/XAML-based activity designers with advanced UI controls Handle payload serialization using Json.NET Configure metadata (IRegisterMetadata, UITypeEditor, TypeConverter) Manage property exposure via InArgument / OutArgument Required Skills: Minimum 4 years of hands-on experience in C#/.NET (4+) Proven experience in creating custom UiPath activity packages Strong understanding of generics, reflection, and serialization Experience with REST API modeling and object mapping Knowledge of workflow metadata and UI property extensions Preferred Qualifications: Experience with NuGet packaging and versioning Familiarity with unit testing tools for workflows (e.g., XamlTest) Exposure to CI/CD pipelines for automation solutions Contract Duration: 2 Months Start Date: Immediate To Apply / Refer: Please share your profile at Hr@centelli.com