Manuel Kübler-Senior Full-Stack Developer & IT Trainer
Check rate
Experience
.NET Developer, SAP Business One Consultant
Own Projects
- DTO class generator: In-house development of a tool for the automatic generation of classes, functions, and methods for use in .NET Core projects based on SAP Business One Service Layer metadata
- E-invoice import add-on: Development of a SAP Business One add-on / coresuite module for the automated import of ZUGFeRD e-invoices as incoming invoices – with configurable mapping to flexibly control the import logic across four mapping types (DIRECT, SQL, FIXED, EXPR). The add-on is available as a licensed product for SAP Business One customers.
Stack: SAP Business One, SAP Business One Service Layer, coresuite Country Package, C#
Instructor & Course Author
cmt GmbH
- PostgreSQL Basics & Advanced (2025/2026)
- React for Advanced Users (2024/2025): React, Redux Toolkit, GraphQL, TailwindCSS, Vite, Vitest, Cypress, TypeScript
- Laravel Compact Course (2025): PHP, Laravel, MySQL, PHPUnit, Docker — developed example project TaskFlow
- Nx Compact Course (2025): Nx, TypeScript
- Git Basics Course (2025): Git, GitHub, GitLab, CI/CD, Docker
- ASP.NET Introduction (2025): ASP.NET Core MVC, Web API, Blazor, Razor Pages, ASP.NET Core Identity
- Vue.js Basic Course (2023/2024): Vue.js, Pinia, Vite, Vitest, Cypress, TypeScript
- React Basics (2022): React, Vite, Vitest, TypeScript
- In each case, development of example projects, training materials incl. exercises, and course delivery
SAP Business One Consultant
Magnetbau Schramme GmbH & Co. KG
- SAP Business One Service Layer: installation & configuration incl. table allowlist, column allowlist, and permissions
- Customizing SAP Business One & beas Manufacturing
- SQL queries for reports & alerts
- Import/export interfaces for production & warehouse data
Stack: SAP Business One, C#, SQL, coresuite Country Package
Full-Stack Developer
Spedition Stahmer
- Porting of an Excel workbook to a warehouse management web application for putaway, picking, and inventory
Stack: Laravel, React, Redux Toolkit, Material UI
Full-Stack Developer
SMF GmbH
- Administration interface for the Monheim Pass
Stack: Spring Boot in the backend and Vue.js, Vuetify, Jest, Cypress & Storybook in the frontend
SAP Business One Consultant, Full-Stack Developer
Alfred Galke GmbH
- SAP Business One Service Layer: installation & configuration including Table Allowlist, Column Allowlist, and permissions
- Authorization concept in SAP Business One
- E-invoicing (ZUGFeRD): creation & configuration of e-invoices with coresuite Designer
- Document check: development of a coresuite Customize rule for automated checking of SAP Business One documents based on a SQL-based rule catalog (CTEs)
- Multi-level batch tracking: SQL query for all movements of a batch
- Warehouse management (transfer): development of a web application with Vue 3, Quasar, and TypeScript for transferring batch-managed items on warehouse locations in SAP Business One — with real-time connection via the SAP Business One Service Layer
Stack: SAP Business One, SAP Business One Service Layer, C#, SQL, coresuite Country Package, Vue 3, Quasar, TypeScript
SAP Business One Consultant
WKN Datentechnik GmbH
- E-invoicing (ZUGFeRD): creation & configuration of e-invoices with coresuite Designer
- Billing assistant: development of a coresuite Customize rule for assisted billing in SAP Business One
- Delivery – create devices in IT-Man: development of a coresuite Customize rule for the automated transfer of serial-number-managed devices and PCs/servers from SAP B1 delivery notes into an external IT management database (IT-Man)
- Import incoming invoices via import template: development of a coresuite Customize rule for CSV-based import of incoming invoices into SAP Business One — with configurable import templates per vendor, file selection dialog, and automatic creation of invoice drafts
Stack: SAP Business One, C#, SQL, coresuite Country Package
.NET Developer, Full-Stack Developer
TRENDline GmbH & Co. KG
- Dispo Online: development of an online platform (Laravel, Angular, NgRx) for providing and booking passenger counting jobs by external employees, as well as a desktop application (C#, Entity Framework, DevExpress) for internal order processing and preparing data for the portal
Stack: Laravel, Angular, NgRx, C#, Entity Framework, DevExpress
SAP Business One Consultant
Polyfoam Kautschuk GmbH
- SAP Business One Service Layer: installation & configuration including Table Allowlist, Column Allowlist, and permissions
- Calculation module: Windows application connected to SAP Business One via the Service Layer (SQL queries, bills of materials, quotes) for calculating customer-specific requests
- Multi-stage production module: coresuite Customize rule for creating multiple production orders
- Production labels: layout for SAP Business One
Stack: SAP Business One including Service Layer, C#, SQL, DevExpress, coresuite Country Package
IT Specialist for Application Development
Wrede GmbH Softwarekonzepte
Full-Stack Developer
Various Web Clients
- Booking platform for rehearsal rooms: Laravel, Vue.js, TypeScript
- Administration software: Laravel, Angular, TypeScript, NgRx, TailwindCSS, Laravel Sanctum
- Intranet application: Node.js, React, Next.js
- Payment package for PayPal & Payrexx in Laravel (TIVITA GmbH, Mannheim)
- Order management with Laravel & sevDesk integration (ella-Verlag, Düsseldorf)
- Inventory management system with Laravel (Ballon-Mueller Diffusion GmbH, Herznach CH)
- Request portal for processing travel requests with Laravel & WordPress (DNDS GmbH, Bergheim)
- Partner portal with Laravel & WordPress (UrbanOffers, Vienna)
SAP Business One Consultant
L.W.C. Michelsen GmbH
- SAP Business One Service Layer: installation & configuration including table allowlist, column allowlist, and permissions
- EDI interface: import/export of ORDERS, DESADV, INVOIC, IFTMIN from SAP Business One
- E-invoicing (ZUGFeRD): creation & configuration of e-invoices with coresuite Designer
- DATEV export: development of a Windows application for the automated preparation and export of DATEV-relevant postings from SAP Business One into DATEV format (C#, SQL, DevExpress)
- SEPA generator: development of a Windows application for the automated creation of SEPA payment files from SAP Business One data and direct transfer to the bank (C#, SQL, DevExpress)
- Shopware integration: automated transfer of orders, items, and customers
- MDE logistics: Android app (Xamarin & MAUI) for picking, goods receipt, and stock transfers
- WMS integration: automatic synchronization of inventory levels between SAP Business One and the freight forwarder
- Commission accounting: development of a Windows service for the automatic calculation of commissions, creation of commission reports, and automatic sending and creation of the related incoming invoices in SAP Business One (C#, SQL, SharpShooter Reports)
- Reports: creation of various SQL-based reports and analyses in SAP Business One (SQL, SharpShooter Reports, Crystal Reports)
- Layout adjustments: adaptation and creation of sales and purchase documents in SAP Business One (coresuite Country Package, Crystal Reports)
Stack: SAP Business One, C#, SQL, coresuite Country Package
Freelance Full-Stack Developer & IT-Trainer
Self-employed
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Education, Food and Beverage, Manufacturing, Transportation, and Government and Administration.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Logistics, Operations, Accounting, Finance, and Supply Chain Management.
Summary
Hello, my name is Manuel Kübler. I am a freelance full-stack developer and IT trainer with over 12 years of project experience. My focus is on developing modern web applications with React, Vue.js, Angular, Laravel, and Node.js, as well as designing and running intensive training courses for software companies and universities. In addition, I have deep knowledge in SAP Business One development with C# and in the coresuite Country Package (coresuite Designer, coresuite Customize, coresuite Enterprise Search). I stand out through a structured, quality-conscious way of working, personal responsibility, and reliability.
Skills
C#
Php
Javascript
Typescript
Sql
Java
React
Vue.Js
Laravel
Node.Js
Angular
Entity Framework
Apollo Graphql
Nest.Js
Nx
Quarkus / Spring Boot
Storybook
Css
Bootstrap
Tailwind Css
Material Ui
Vuetify
Devexpress
Sap Business One
Sap B1 Service Layer
Coresuite Country Package
Edi
Beas
Git
Jira
Visual Studio / Vs Code
Vite
Intellij & Phpstorm
Docker / Ci-Cd
Xamarin
Claude
Chatgpt
Jest
Cypress
Vitest
React Testing Library
Phpunit
Nunit / Xunit
Junit
Languages
Education
FH Südwestfalen
Master of Science · Applied Computer Science
FH Südwestfalen
Bachelor of Science · Applied Computer Science · 2.5
VoiceIn GmbH
Training as an IT Specialist in Application Development · Application Development · Rottenburg am Neckar, Germany
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Manuel is based in Iserlohn, Germany and can operate in on-site, hybrid, and remote work models.
Manuel speaks the following languages: German (Native), English (Intermediate).
Manuel has at least 14 years of experience. During this time, Manuel has worked in at least 8 different roles and for 13 different companies. The average length of individual experience is 1 year and 1 month. Note that Manuel may not have shared all experience and actually has more experience.
Based on recent experience, Manuel would be well-suited for roles such as: .NET Developer, SAP Business One Consultant, Instructor & Course Author, SAP Business One Consultant.
Manuel's most recent position is .NET Developer, SAP Business One Consultant at Own Projects.
In recent years, Manuel has worked for Own Projects, cmt GmbH, Magnetbau Schramme GmbH & Co. KG, Spedition Stahmer, and SMF GmbH.
Manuel is most experienced in industries like Information Technology, Education, and Food and Beverage. Manuel also has some experience in Manufacturing, Transportation, and Government and Administration.
Manuel is most experienced in business areas like Information Technology, Logistics, and Operations. Manuel also has some experience in Accounting, Finance, and Supply Chain Management.
Manuel has recently worked in industries like Information Technology, Education, and Food and Beverage.
Manuel has recently worked in business areas like Information Technology, Logistics, and Operations.
Manuel holds a Master in Applied Computer Science from FH Südwestfalen and a Bachelor in Applied Computer Science from FH Südwestfalen.
Manuel is immediately available part-time for suitable projects.
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Calculated based on our freelancers’ daily rates as of 25 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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