Joachim is available for hire
Hire JoachimJoachim Kuhn
Verified Expert in Engineering
Software Developer
Location
Neu-Isenburg, Hessen, Germany
Toptal Member Since
May 27, 2021
Joachim is a passionate C# programmer who likes working with SQL Server databases for data analysis, creating libraries (DLLs) or WinForms applications for solving complex problems, and using SQL directly or Entity Framework for data operations. Joachim has more than 20 years of experience.
Availability
Part-time
Preferred Environment
Windows, Visual Studio, C#.NET WinForms, C#.NET
The most amazing...
...thing I've developed is accounting and order processing software.
Work Experience
Senior Developer
2018 - PRESENT
Freelance
- Developed and extended a large number of C# libraries and WinForms programs to calculate asset ratings and maintain asset data for a rating agency.
- Used Jira Kanban boards for project tracking, Confluence for documentation, and TFS and Git as a versioning system.
- Created a new rating algorithm for awards ranking. Migrated quote retrieval to Azure Functions.
Technologies: C#, Kanban, C#.NET WinForms
Senior Developer
2010 - 2018
Freelance
- Migrated accounting and order processing software from C++ and MFC to C#, implementing continuous development and improvement.
- Added functionality to comply with GDPR. Implemented E-Bilanz (Taxonomy 6.0 and 6.1) for online submission of balance sheet.
- Evaluated the complex structure of XBRL and created routines to read and process the elements.
Technologies: C#.NET WinForms
Senior Consultant
2017 - 2017
Freelance
- Created a basic and detailed concept for the implementation of SharePoint as an audit-proof document repository for a German bank.
- Created Excel files for migrating legacy data to SharePoint via REST API.
- Created PowerShell scripts for fast provisioning of new website collections.
- Trained all personnel in handling SharePoint lists and libraries.
Technologies: SharePoint
Senior Developer
2016 - 2016
Freelance
- Implemented a CapEx portal with SharePoint 2010 and InfoPath 2010 using Nintex Workflow for the approval process.
- Analyzed the paper-based process and designed an online process.
- Created and filled SharePoint lists to configure the approval process with Nintex Workflow.
Technologies: SharePoint, InfoPath, Nintex Workflow
Senior Developer
2015 - 2015
Freelance
- Created a C# application for metadata management of decor and image data.
- Provided lists in SharePoint and filled by C# app for metadata search.
- Implemented queue processing with RabbitMQ for worldwide image data transfer.
Technologies: C#, RabbitMQ
Application Developer
1996 - 2015
Freelance
- Created and extended accounting and order processing software with C++ and MFC.
- Implemented an EDI interface for submission of orders to distributors and receiving delivery status updates and invoices.
- Applied additions according to customer requirements for webshop data and reportings.
Technologies: C++, Microsoft Foundation Class (MFC) Library, Microsoft Foundation Classes (MFC)
Senior Developer
2012 - 2012
Freelance
- Created a risk appraisal solution in SharePoint 2010 with InfoPath 2010.
- Analyzed workflows for implementation as an online solution.
- Created custom workflow activities with C# and used them in SharePoint 2010 workflow for the risk appraisal approval.
Technologies: SharePoint, InfoPath
Senior Developer
2010 - 2010
Freelance
- Built a webshop based on osCommerce, creating import routines in C# to transfer orders into order processing software.
- Created an export routine to transfer shipping data to DHL software (Easylog).
- Optimized the shipping process with scanner and barcode processing for delivery status.
Technologies: C#, osCommerce
Experience
Accounting and Order Processing Software
Developed C# programs to maintain the accounting system, post to the accounts, maintain articles, create offers, order confirmations, delivery notes, and invoices, and create all statutory reports. Used ERIC API to submit advance VAT return and balance sheet.
CapEx Portal
A SharePoint-based portal for the acquisition of investment applications. I created several lists to control the workflows and avoid modifying the workflow when approving managers changed. The form to enter the data was implemented with InfoPath and the workflow with Nintex.
WinForms App and Libraries for Asset Management and Rating Calculation
A C#-based application for maintaining asset data, such as issuer or prices, and libraries for calculating the monthly rating. A large amount of data from providers is imported every month through SSIS packages. I added the import of new important indicators (ESG and SRI), optimized the database, and created a new tool for ad-hoc data analysis.
Portal as Audit-proof Document Store
A SharePoint-based portal to store documents of a German bank. I created all necessary concepts, websites, libraries, and templates for every department and documentation area. I created the system documentation and trained all employees to use the portal. For migration of existing data, I created VBA macros in Excel to use the REST API of SharePoint.
Approval Portals
SharePoint-based approval portals for vacation, travel, and CapEx. Analyzed the paper-based forms and approval processes, and then I created InfoPath forms and control lists for approval with Nintex Workflow.
App for Image Metadata
A C# program to enter and update metadata (classification) of decor and image files. This data was uploaded to SharePoint for metadata search. Another C# program used RabbitMQ to transfer decor and images to other offices worldwide for surface production.
Migration of a DOS-based Environment to WinForms
I replaced the complete DOS-based application environment for order processing with my accounting and order processing software, implemented the data transfer from osCommerce into the order processing system, created a module to transfer the shipping data to DHL Easylog, and made tracking data available for the shipped orders.
Skills
Languages
C#.NET, C#, T-SQL (Transact-SQL), SQL, Excel VBA
Frameworks
.NET, .NET Core
Libraries/APIs
Windows Forms (WinForms), LINQ, Entity Framework
Tools
C#.NET WinForms, Visual Studio, Hyper-V, RabbitMQ
Storage
Microsoft SQL Server, SQL Server Integration Services (SSIS), Azure SQL, Azure Websites
Paradigms
ETL, DevOps, Kanban, Anomaly Detection, Microservices
Platforms
Windows, Windows Server, Windows Server 2008, Windows Server 2012, osCommerce, Azure, Azure IaaS, Azure Functions, Azure Event Hubs
Other
Finance, Programming, Organization, XBRL, Neural Networks, Deep Learning, Classification, Azure Storage, Azure Service Bus
Industry Expertise
Accounting
Education
1984 - 1987
State-certified Computer Scientist in Business Informatics
Akademie für Datenverarbeitung - Böblingen, Germany
Certifications
AUGUST 2021 - AUGUST 2022
Microsoft Certified: Azure Developer Associate
Microsoft
JULY 2021 - PRESENT
Microsoft Certified: Azure Fundamentals
Microsoft
MAY 2020 - PRESENT
Machine Learning
Stanford University | via Coursera
MAY 2015 - PRESENT
MCSA Windows Server 2012/R2
Microsoft
MAY 2008 - PRESENT
MCITP Windows Server 2008
Microsoft
MARCH 2008 - PRESENT
MCITP SQL Server 2005
Microsoft
NOVEMBER 2002 - PRESENT
MCDBA SQL Server 2000
Microsoft
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