Björn Wilmsmann - Software Architecture Consultant

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Oberhausen, Germany

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Experience

Jan 2023 - Dec 2023

1 year

Software Audit and Architecture Consulting: Portal Software

I carried out a software audit and architecture consulting for an existing portal software for infrastructure provisioning for a company that offers virtual reality environments.
Role: Mentoring and consulting
Technologies used: Java

Jan 2021 - Present

5 years 9 months

Consulting and Mentoring: eCommerce Platform for Order Processing

I supported a publishing house that offers online publications through different eCommerce business models in the redevelopment of a platform for order processing.
Role: Consulting and mentoring
Technologies used: AWS, Java, Spring Boot, Microservices

Jan 2021 - Dec 2021

1 year

Mentoring and Consulting: Updating Front-end Applications for Document Management

I advised a company that develops document management software on the migration of various front-end components to current Angular and PrimeNG versions.
I guided developers at the company with approaches and best practices for implementing this migration.
Role: Mentoring and consulting
Technologies used: Angular, PrimeNG

Jan 2020 - Dec 2024

5 years

Development and Consulting: HMI for Machine Control

For a mechanical engineering company, I am developing a new HMI for machine control.
Role: Development and consulting
Technologies used: React, Material-UI, Express, Node.js, JavaScript

Jan 2020 - Dec 2023

4 years

Author: Stratospheric - From Zero to Production with Spring Boot and AWS

Together with two other authors, I published an eBook in mid-2021 titled “Stratospheric - From Zero to Production with Spring Boot and AWS”. This eBook is a comprehensive guide for developing and deploying Spring Boot applications in AWS cloud environments.
Role: Author
Technologies used: AWS, CDK, Spring Boot, Java

Jan 2020 - Dec 2021

2 years

Development and Mentoring: Application for Capacity Planning

I supported a billing company in the healthcare sector with the implementation of an application for capacity planning.
I guided developers in using new software technologies with which this application was built.
Role: Development and Mentoring
Technologies used: Angular, TypeScript, Jasmine, Protractor, Karma, Java, Spring Boot

Jan 2019 - Dec 2019

1 year

Development and Consulting: Configurator for Variant Management (CPQ, PIM)

I supported a provider of variant management software (CPQ, PIM) in the development of a rule-based configurator.
Role: Development and Consulting
Technologies used: jQuery, Node.js, SheetJS, jQuery-csv, HTML, CSS

Jan 2018 - Dec 2019

2 years

Design and Development: Software for Construction Site Management

For a company that offers software for construction site management, I designed and developed modules for use in a mobile application.
Role: Design and Development
Technologies used: JavaScript, Ext JS, Apache Cordova

Jan 2018 - Dec 2019

2 years

Development and Quality Assurance: Application for Recording and Accounting of Benefits in Kind

For an insurance company, I developed a web-based application for recording and accounting of benefits in kind.
Role: Development and Quality Assurance
Technologies used: Java, Spring, Spring Boot, Hibernate, JUnit, Angular 2, TypeScript, Karma, Jasmine, Protractor, PostgreSQL, Docker, Amazon Web Services

Jan 2018 - Dec 2019

2 years

Mentoring and Consulting: Application for Coordinating Billing Processes

I supported a billing company in the healthcare sector with the implementation of an application for coordinating billing processes.
I guided developers in using new software technologies with which this application was built.
Role: Mentoring and Consulting
Technologies used: Angular, TypeScript, Jasmine, Protractor, Karma, Java, Spring Boot

Jan 2017 - Present

9 years 9 months

Workshops: Spring Boot / Spring Cloud

In collaboration with a provider of IT workshops, I give workshops on Spring Boot and Spring Cloud.
Role: Trainer and concept development
Technologies used: Java, Spring, Spring Boot, Spring Cloud

Jan 2017 - Dec 2018

2 years

Concept and Development: Mobile Service App

For a provider of drive technology, I designed and developed a mobile app for field service requests.
Role: Concept and development
Technologies used: Ionic, Angular 2, TypeScript, Swift, Xcode

Jan 2017 - Dec 2017

1 year

Development: eCommerce / PIM Solutions

For a provider of eCommerce / Product Information Management (PIM) systems, I implemented microservice-based solutions that extend existing applications and add new functionality.
Role: Development
Technologies used: Java, Docker, Spring, Spring Boot, Spring Integration, Apache POI, Mockito, REST Assured, RabbitMQ, JavaScript, JSON Schema, Hybris

Jan 2017 - Dec 2017

1 year

Concept and Development: Search Solution for Variant Management (CPQ, PIM)

For a provider of variant management software (CPQ, PIM), I designed and developed a search solution based on Elasticsearch.
Role: Concept and development
Technologies used: Java, Elasticsearch, Spring, Spring Boot, JUnit, Mockito, REST Assured

Jan 2017 - Dec 2017

1 year

Mentoring and Consulting: Software for Sales Systems (POS)

I advised a provider of sales system software (POS) in the logistics industry on choosing new front-end technologies and on quality assurance in software development (testing, continuous deployment).
Role: Mentoring, quality assurance and consulting
Technologies used: Angular 2, TypeScript, AngularJS, Jasmine, Protractor, Karma

Jan 2016 - Dec 2019

4 years

Mentoring, Consulting, and Development: Software for Logistics and Compliance Management

I advised a software provider for logistics and compliance management on improving quality assurance processes in software development (testing, database migration, continuous deployment).
Role: mentoring, quality assurance, and development
Technologies used: Java, Spring, JPA, JUnit, Mockito, Flyway, Spring Batch, Angular 2, TypeScript, Cucumber, Docker

Jan 2016 - Dec 2017

2 years

Doctor Information Systems

I supported a provider of doctor information systems in reviewing and refactoring the software architecture used there for developing application modules.
I improved the framework used to develop the customer's different products in terms of maintainability and reliability.
Role: architecture and development
Technologies used: JavaScript, AngularJS, Jasmine, Karma, TypeScript

Jan 2016 - Dec 2016

1 year

Serialization Solution

For a company offering scalable serialization solutions, I developed user-friendly interfaces and improved the user experience of the existing application.
Role: design and development
Technologies used: Java, Spring, JPA, Vaadin

Jan 2015 - Dec 2016

2 years

Mentoring and Development: Software for Public Administration

I was involved in developing the next product version at a provider of software for public administration.
At the same time, I trained the in-house developers in different frontend technologies - mainly AngularJS and JavaScript - and how they work together with Java backend applications.
Role: mentoring and development
Technologies used: Java, Spring, Hibernate, JavaScript, AngularJS, Lucene, Solr

Jan 2015 - Dec 2015

1 year

ERP System for eCommerce Applications

For a US eCommerce company in the clothing industry, I developed a web-based ERP solution to manage and process inbound and outbound goods, inventory, and individual stock levels for different products, locations, and sales channels.
Role: architecture, development, and design
Technologies used: Java, Spring Web MVC, Spring Boot, JavaScript, AngularJS

Jan 2014 - Present

12 years 9 months

ZenQuery

ZenQuery is an Enterprise Backend as a Service.
ZenQuery provides you with an instant REST API for your SQL queries. Anything that can be expressed by SELECT * FROM ... ZenQuery turns into a conveniently accessible API.
Role: Entrepreneur, Developer, Product Designer
Selection of technologies used: Java, Spring Web MVC, JavaScript, AngularJS, PostgreSQL, various database connections, Heroku

Jan 2014 - Dec 2017

4 years

Controlling application for analyzing receivables and payables

For a renowned consulting company in the controlling sector, I developed a web application that can be used to carry out working capital and cash flow analyses.
The application visualizes results using various dynamically generated charts and allows flexible Excel data import and export.
Role: Development and design
Selection of technologies used: Java, Spring Web MVC, JavaScript, AngularJS, NVD3, D3.js, Chart.js, Excel interfaces (import / export), PostgreSQL

Jan 2014 - Dec 2015

2 years

Freshcard

Freshcard is a digital business card distribution platform. Freshcard allows you to easily connect and exchange contact information with business contacts.
The web application allows you to manage your contact details and create your individual business card layout in the browser (using HTML5 and SVG).
The accompanying iPhone app lets you connect with people right when you meet them.
Role: Entrepreneur, CTO, Developer, Product Designer. Apart from product design and development, my task as CTO was to coordinate a team of developers, designers, and service providers to make sure new product versions were delivered on time and with the right quality.
Selection of technologies used: Java, Spring Web MVC, JavaScript, AngularJS, Fabric.js, SVG, PostgreSQL, iOS, Swift, Multipeer Connectivity, vCard, Heroku

Jan 2013 - Dec 2014

2 years

MemoEasy

Missed appointments are a major problem for many companies. MemoEasy solves this problem by allowing companies to manage their appointments online and letting customers receive a reminder by SMS or email in time before an appointment.
Role: Entrepreneur, CTO, Developer, Designer
Selection of technologies used: Ruby on Rails, PostgreSQL, Twilio, Heroku

Jan 2011 - Dec 2015

5 years

Applications for applying for and processing consumer and business loans

For an international bank, together in a team of 6 developers, I developed various enterprise web applications through which merchants as well as end customers can apply for loans.
These applications also handle the further processing of applications and customer contacts.
Through a service-oriented architecture, numerous backend systems are connected, for example core banking systems and risk assessment systems.
Role: Development and design
Selection of technologies used: Java, Spring, Hibernate, SOAP, WebSphere, JMS, Socket Services, Oracle Database, Lucene

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Manufacturing, Healthcare, Media and Entertainment, Banking and Finance, and Transportation.

Information Technology

Manufacturing

Healthcare

Media and Entertainment

Banking and Finance

Transportation

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, Quality Assurance, Business Intelligence, Finance, and Accounting.

Information Technology

Product Development

Quality Assurance

Business Intelligence

Finance

Accounting

Languages

German

Native

English

Native

Dutch

Advanced

Spanish

Intermediate

French

Intermediate

Statistics

Experience

Total positions 25

Experience in Information Technology 13.5 y

Avg length 3 y

Longest experience 12 y 8 m

Expertise

Recent roles Software Audit and Architecture Consulting: Portal Software, Consulting and Mentoring: eCommerce Platform for Order Processing, Mentoring and Consulting: Updating Front-end Applications for Document Management

Main industries Information Technology, Manufacturing, Healthcare

Main business areas Information Technology, Product Development, Quality Assurance

Profile

Member since

July 2025

Last update

August 2026

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Frequently asked questions

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Björn is based in Oberhausen, Germany and prefers 100% remote projects.

Björn speaks the following languages: German (Native), English (Native), Dutch (Advanced), Spanish (Intermediate), French (Intermediate).

Björn has at least 16 years of experience. During this time, Björn has worked in at least 25 different roles. The average length of individual experience is 1 year and 8 months. Note that Björn may not have shared all experience and actually has more experience.

Based on recent experience, Björn would be well-suited for roles such as: Software Audit and Architecture Consulting: Portal Software, Consulting and Mentoring: eCommerce Platform for Order Processing, Mentoring and Consulting: Updating Front-end Applications for Document Management.

Björn's most recent position is Software Audit and Architecture Consulting: Portal Software.

Björn is most experienced in industries like Information Technology, Manufacturing, and Healthcare. Björn also has some experience in Media and Entertainment, Banking and Finance, and Transportation.

Björn is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Björn also has some experience in Business Intelligence, Finance, and Accounting.

Björn has recently worked in industries like Information Technology, Media and Entertainment, and Manufacturing.

Björn has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.

Björn is immediately available part-time for suitable projects.

Daily rate distribution

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<€640 €640-720 €800-880 €960+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

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Daily rate avg. 895 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

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Median rate 960 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.