Björn Gerdau - Full Stack Developer and Solution Architect

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Titz, Germany

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Experience

Mar 2025 - Apr 2025

2 months

Fullstack Developer

The Coach AI

Implemented the frontend and backend of a chat application for an AI startup
Used Go and Dart
Technologies: gRPC, Flutter, Terraform (IaC)
CI/CD via GitHub, deployment on Google Cloud Run

Jul 2024 - Jan 2025

7 months

Fullstack Developer

ITZBund

Greenfield development of a cloud-native fullstack application for federal budget financial accounting
Backend: highly reliable microservice architecture, millions of Kafka messages, XSD validation
Frontend: strictly accessible portal experience with React and KoliBri, mockups via Figma
Languages: Go, TypeScript
Technologies: Kafka, Docker, React, PostgreSQL, XSD, XML, AWS S3, OpenTelemetry
CI/CD: Azure DevOps
Deployment: Azure, OpenShift, Kubernetes

Apr 2024 - Jul 2024

4 months

DevOps Engineer

BWI

Developed a PoC for a cloud-native IoT hub with Eclipse Hono and an MQTT data ingestion pipeline
Implemented a highly available Eclipse Hono deployment, Kafka topics for data analysis
Developed a Go tool to simulate IoT devices
CI/CD: GitLab, ArgoCD
Deployment: Helm, Kubernetes

Jul 2023 - Jun 2024

1 year

DevOps Engineer

Particulate GmbH

Developed a scalable infrastructure PoC as an addition to the existing platform backend
IaC in the StackIT cloud via Terraform
Generated and reviewed an OpenAPI documentation using AI tooling in mid 2024
Technologies: StackIT, Terraform, PostgreSQL, OpenAPI, GitHub Copilot
CI/CD: GitHub Actions
Deployment: StackIT, Helm, Kubernetes

Apr 2021 - Dec 2023

2 years 9 months

Backend Developer

Bayer

Designed and integrated a platform-wide authentication concept
Designed and implemented an asynchronous, event-driven architecture and data mesh concepts
Optimized the GitLab CI/CD pipeline and migrated from GitLab to GitHub (~600 repositories)
Services as serverless microservices (AWS Lambda) with Go and Python, orchestration via Terraform and AWS CDK
Supported DevOps in the third year: provided GitHub Actions, maintained central infrastructure
Technologies: AWS (API Gateway, DocumentDB, DynamoDB, Lambda, RDS, S3, SNS, SQS, Kinesis, CDK, IAM, EC2), Docker, GraphQL, Terraform, Terratest, Angular, Renovate
CI/CD: GitHub Actions, GitLab
Deployment: AWS, Helm, Kubernetes

Mar 2020 - Mar 2021

1 year 1 month

Fullstack Developer

Bank11

Design and development of an MVP for a car subscription platform
Backend: Go microservices, AWS EKS, MSK, S3, CloudFront, Lambda@Edge, SNS, Snowflake-PostgreSQL
Frontend: Angular, deployment via AWS S3 and CloudFront, thumbnailing via Lambda@Edge
CI/CD: GitLab CI with unit, integration, and system tests
Collaboration in a Scrum team, presenting conceptual and architectural discussions

Feb 2018 - Mar 2018

2 months

Embedded Developer

Maenken Systems

Led software development of the TimeCube IoT hardware prototype (ESP32, NFC)
Completed on-controller software, bug fixes, plugin implementation for OrangeHRM
Languages: C++ (Arduino), PHP
Technologies: RTOS, bare-metal deployment

Dec 2017 - Dec 2017

1 month

Germany

Research Assistant

Hochschule Bonn-Rhein-Sieg

Further development of a ray tracer based on C++ and CUDA
Presentation at EuroVR

Nov 2017 - Oct 2019

2 years

Java Backend Developer

Rewe Digital GmbH

Further development and optimization of an existing Java microservice architecture in GCP Kubernetes
Integration with external system APIs (SOAP, Wildfly)
Implementation of a tour escalation to relieve the route planning team
CI/CD: Jenkins with unit, integration, and system tests
Documentation via OpenAPI and Swagger
Languages: Java 8-11, Kotlin
Technologies: Docker, GCP, Hibernate, Hystrix, JPA, Kafka, Maven, Gradle, MySQL, PostgreSQL, MongoDB, SOAP, Spring Boot, jUnit, Vue.js, Keycloak
Workflow: Scrum, Kanban

Nov 2016 - Oct 2017

1 year

Hybrid

Backend Developer

toom Baumarkt GmbH

Agile development of the online platform and Click & Collect PoC
Further development of hybrid Java and Go microservices with REST API
Automation using Bamboo and Handlebars templates via Google's V8
Languages: Go, Java 8, JavaScript
Technologies: Docker, jUnit, Spock, Kafka, Selenium
Deployment: bare-metal, Docker Swarm
Workflow: Scrum

Oct 2016 - Dec 2025

9 years 3 months

Developer and Solution Architect

Bookitup GmbH

Consulting on service architecture, API design, service infrastructure
QA work and support during implementation
Heterogeneous microservice architecture with Spring Boot and Quarkus, Kafka event bus
Frontend: migrating from Thymeleaf to React, Webpack to Create React App, deployment via CloudFront/S3
Integration of Intercom and HubSpot
CI/CD: Jenkins and GitLab CI, HA Docker Swarm cluster
Migration to cloud-native AWS and Kubernetes since 2024
Languages: Java 8-17, JavaScript
Technologies: Docker, Hibernate, JPA, Kafka, Maven, MySQL, MongoDB, React, AWS (RDS, MSK, CloudFront, S3, EC2, Lambda, IAM), CloudFormation, JasperReports

Jun 2014 - Oct 2016

2 years 5 months

Working Student PHP and Java

Steep GmbH

Radiation protection and dosimetry management SaaS
2nd and 3rd level support with PHP5
Data model design and software redesign with Java and Spring Boot
Consulting and implementing new features, debugging, database administration (MySQL, MSSQL)
Frontend design for Java application, API programming, migration scripts
Methods: Scrum, Waterfall

Jan 2014 - Mar 2014

3 months

Germany

App and Web Developer

Peter Ulrich Werbung GmbH

Implementing a shop for custom stamps based on an existing framework
AJAX interface for stamp designs without reloading, IE7 compatible

Jun 2013 - Jun 2013

1 month

Android Developer

Peter Ulrich Werbung GmbH

Porting an iOS app to Android with an XML interface for dynamic data fetching
Facebook and Google Maps integration

Jun 2011 - Feb 2014

2 years 9 months

App and Web Developer

Bildpunktschmiede GmbH

Developing and porting the Test Tones app (iOS and Android) for audio device settings (AirPlay)
Storefinder: integration of international dealer search with Google Maps in MODx CMS, database update 2012
Sierra Delta: integration of voucher and flight booking in MODx CMS, responsive design

Dec 2010 - Dec 2010

1 month

Android Developer

Nuromedia

Implementation of the Android version of a Xmas iCard app with OpenGL-based rendering, server integration

Jun 2010 - Jul 2010

2 months

Android Developer

Nuromedia

Development of two puzzle games based on an existing language trainer framework

Industry experience

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

Experienced in Information Technology, Retail, Pharmaceutical, Healthcare, Government and Administration, and Automotive.

Information Technology

Retail

Pharmaceutical

Healthcare

Government and Administration

Automotive

Business area experience

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

Experienced in Information Technology, Product Development, Quality Assurance, Customer Service, Operations, and Accounting.

Information Technology

Product Development

Quality Assurance

Customer Service

Operations

Accounting

Skills

Programming Languages & Frameworks

Java, Gradle, Groovy, Hibernate, Hystrix, Java 17, Jpa, Junit, Kotlin, Maven, Spock, Spring, Spring Boot
Javascript, Angular, Jquery, Node.Js, React, Redux, Vue.Js 2
Babel, Css, Scss, Webpack 4
Cakephp, Composer, Drupal, Php, Phpunit
C++, Go / Golang, Soap (Clients), Ios, Android, Graphql

Concepts & Methods

Ci / Cd, Devops, Kanban, Microservices, Team Leadership, Responsive Web Design, Scrum

Build, Deployment & Platforms

Atlassian Stack (Jira, Confluence, Etc.), Git, Github Actions, Gitlab / Gitlab Ci, Gradle, Jenkins, Makefile, Maven, Svn

Persistence

Apache Solr, Dynamodb, Elasticsearch, Kafka, Mongodb, Mssql / Sql Server, Mysql, Postgresql

Software Testing

Junit, Mockito, Pitest, Selenium, Sonarqube

Languages

German

Native

English

Advanced

Education

Oct 2011 - Jun 2017

Bonn-Rhein-Sieg University of Applied Sciences

B.Sc. Media Informatics · Media Informatics · Sankt Augustin, Germany

Oct 2008 - Jun 2011

Adolf-Kolping-Berufskolleg

Degree as an Information Technology Assistant with Fachabitur · Information Technology Assistant with Fachabitur · Kerpen, Germany

Certifications & licenses

AWS

Oracle

Statistics

Experience

Total positions 17

Experience in Information Technology 12 y

Avg length 1 y 4 m

Longest experience 9 y 2 m

Global experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Fullstack Developer, DevOps Engineer, Backend Developer

Main industries Information Technology, Retail, Pharmaceutical

Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Highest degree Bachelor

Certifications earned 5

Profile

Member since

February 2026

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Frequently asked questions

Have questions? Find more information here.

Björn is based in Titz, Germany and can operate in on-site, hybrid, and remote work models.

Björn speaks the following languages: German (Native), English (Advanced).

Björn has at least 14 years of experience. During this time, Björn has worked in at least 10 different roles and for 15 different companies. The average length of individual experience is 1 year and 10 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: Fullstack Developer, DevOps Engineer, Backend Developer.

Björn's most recent position is Fullstack Developer at The Coach AI.

In recent years, Björn has worked for The Coach AI, ITZBund, BWI, Particulate GmbH, and Bayer.

Björn is most experienced in industries like Information Technology, Retail, and Pharmaceutical. Björn also has some experience in Healthcare, Automotive, and Banking and Finance.

Björn is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Björn also has some experience in Customer Service, Operations, and Accounting.

Björn has recently worked in industries like Information Technology, Pharmaceutical, and Government and Administration.

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

Björn holds a Bachelor in Media Informatics from Bonn-Rhein-Sieg University of Applied Sciences.

Björn has 5 certificates. Among them, these include: AWS Certified Solution Architect Associate, AWS Certified Developer Associate, Oracle Certified Professional, and Java SE 8 Programmer.

The availability of Björn needs to be confirmed.

Daily rate distribution

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<€640 €640-800 €800-960 €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

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Daily rate avg. 900 €

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 26 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.