Strong Middle/Senior .Net Full Stack Developer for SaaS product

C# / .NET WPF Developer – Completion of Migration of a Large Invoicing Program RAFSOFT.NET Sp. z o.o. is looking for a C# / .NET developer to complete the rewriting of a large, long-standing invoicing program to a new technology. The project involves the migration of an extensive desktop application for companies, used for invoicing, handling sales documents, contractors, records, and accounting-tax functions. The new version of the program is being created in C# / .NET, using DevExpress components. The project is already about 70% rewritten. We are looking for someone who can help bring it to completion, organize the missing elements, perform tests, and ensure the new version operates in accordance with the existing program. Scope of Work: completion of the migration of a large desktop application to C# / .NET, recreation of the functionality of the old program in the new version, maintaining as identical logic of operation, appearance, and handling as possible, working with DevExpress components, analyzing existing code and comparing the operation of the old and new versions of the program, fixing bugs, completing missing functions, and testing the application, collaborating on the final preparation of the program for deployment. Requirements: very good knowledge of C# and .NET, experience in creating desktop applications for Windows, knowledge of WPF or WinForms, experience with DevExpress or similar UI component libraries, ability to analyze a large existing project, accuracy and patience in reproducing existing functionality, ability to test one's own changes, very good ability to use AI tools supporting programming, code analysis, refactoring, and testing. Preferred: experience with legacy projects, knowledge of or previous work with Visual Basic 6.0, experience in migrating applications from older technologies to C# / .NET, knowledge of issues related to invoicing, accounting, JPK, or KSeF, experience working with large business applications. Who We Are Looking For: We are looking for a self-sufficient, precise, and technically experienced person who can enter an existing project, understand its logic, and consistently bring it to completion. In this project, it is very important not only to write new code but also to faithfully reproduce the operation of the old program — both in terms of functionality and appearance as well as handling. We also require proficiency in using AI tools in daily programming work. We are looking for someone who can use AI practically: for code analysis, bug finding, speeding up migration, creating tests, and organizing the project. About the Company: RAFSOFT.NET Sp. z o.o. is a Polish company creating software for entrepreneurs, accounting offices, and small and medium-sized enterprises. Our main product is the VAT Invoice program, supporting the daily handling of invoices, sales documents, contractors, records, and settlements in accordance with Polish regulations. We develop our own desktop applications and tools related to invoicing, accounting, KSeF, JPK, and automation of business processes. Our solutions are designed with stability, ease of use, and practical application in users' daily work in mind. Company website: www.rafsoft.net

Configuration: 1C UT 11 Address warehouse Zebra TC26 TSD Work via RDP Product scanning is performed in receiving, placement, picking documents, and other warehouse operations. Current problem: Warehouse workers operate through the Zebra TSD. When scanning, they do not always notice messages on the screen. It is necessary to implement different sound signals for different scanning results. Required functionality: Successful scanning and processing in 1C short sound signal. Barcode read by the scanner, but the product is not found in 1C another sound signal (different from successful). Error during warehouse operation incorrect cell; incorrect product; other address warehouse control errors. separate sound signal. Sounds should be played on the TSD via RDP. Preferences: use of WAV files or another reliable playback method; ability to add new types of sound messages in the future; minimal impact on the speed of TSD operation. Please specify in your response: Experience with UT 11 and address warehouses. Have you implemented similar tasks for Zebra TSD or other TSDs. Estimated cost and execution time. How the implementation of sound signals is planned.