Dirk Bolte - Senior Software Developer

Q: Where is Dirk based?

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

Q: What languages does Dirk speak?

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

Q: How many years of experience does Dirk have?

Dirk has at least 23 years of experience. During this time, Dirk has worked in at least 16 different roles and for 11 different companies . The average length of individual experience is 1 year and 3 months . Note that Dirk may not have shared all experience and actually has more experience.

Q: What is Dirk's latest experience?

Dirk's most recent position is Senior Software Developer at congstar .

Q: What companies has Dirk worked for in recent years?

In recent years, Dirk has worked for congstar , Anonymous Client , WorkGenius , OTTO , and JB10X .

Q: Which industries is Dirk most experienced in?

Dirk is most experienced in industries like Information Technology (IT) , Telecommunication , and Professional Services . Dirk also has some experience in Retail and Healthcare .

Q: Which business areas is Dirk most experienced in?

Dirk is most experienced in business areas like Product Development , Information Technology (IT) , and Quality Assurance (QA) . Dirk also has some experience in Project Management , Human Resources (HR) , and Operations .

Q: Which industries has Dirk worked in recently?

Dirk has recently worked in industries like Information Technology (IT) , Telecommunication , and Professional Services .

Q: Which business areas has Dirk worked in recently?

Dirk has recently worked in business areas like Information Technology (IT) , Human Resources (HR) , and Product Development .

Recommended expert

Birkenfeld, Germany

Experience

May 2024 - Present

1 year 11 months

Senior Software Developer

congstar

Mobile app backend development in the mobile network management area for end customers
Implementation of authentication methods
Converting a monolith to microservices
Operational support
Technologies: Kotlin, Quarkus, Microprofile, Jackson, MariaDB, Redis, JSON, XML, SOAP, Maven, Git, GitLab CI, Splunk, Grafana, Jenkins, Kubernetes, Helm, Terraform, Microservices

Apr 2024 - May 2024

2 months

Software Developer

Anonymous Client

Optimizing GitLab pipelines
Creating training materials around OpenID and gematik
Technologies: GitLab, GitLab CI, Java, Kotlin, TypeScript, Spring, Quarkus, Angular, Keycloak, OAuth, OpenID, gematik

Nov 2023 - Present

2 years 5 months

Technical Interview Consultant

WorkGenius

Conducting interviews with a focus on technology topics
Technologies: Java, Kotlin, various technical topics

Aug 2023 - Apr 2024

9 months

AWS/Kotlin Developer

OTTO

Fullstack development including DevOps in the product categorization area for eCommerce
Migrating from Spring Boot 2 to 3 and Vue.js 2 to 3
Database optimization
Technologies: Kotlin, Spring Boot, Microservices, MongoDB, JSON, Vue.js/TypeScript, REST, HAL, Gradle, Git, GitHub Actions, Terraform, Terragrunt, Docker, AWS, OIDC, Keycloak

Jan 2023 - Jul 2023

7 months

Lead Architect

JB10X

Web backend and frontend development for a SaaS solution in identity management and dynamic workflows
Operational support
Technologies: Java, Spring Boot, Spring Cloud, Microservices, Jackson, PostgreSQL, RabbitMQ, JSON, Vue.js, Maven, Git, GitHub Actions, Kubernetes, Docker Compose, FluxCD, OIDC, Keycloak

May 2022 - Dec 2022

8 months

Security Consultant

JB10X

Threat modeling of an existing application and advising on how to address discovered vulnerabilities
Software development
Technologies: Threat Modeling, Spring Boot, Kotlin, Java

Oct 2021 - Feb 2023

1 year 5 months

Technical Interview Consultant

expertlead

Conducting interviews with a focus on technology topics
Technologies: Java, Kotlin, various technical topics

Oct 2021 - Jan 2023

1 year 4 months

Senior Software Developer

congstar

Mobile app backend development for end-customer mobile network management
Porting a backend from Java/Spring to Kotlin/Quarkus
Operational support
Technologies: Kotlin, Java, Spring Boot, Quarkus, MicroProfile, Jackson, MariaDB, JSON, XML, SOAP, Maven, Git, Splunk, Jenkins, Kubernetes, Helm

Jul 2021 - Dec 2021

6 months

Software Developer

LANCOM

Integrating external identity providers using SAML and OIDC/OAuth2 into an existing SaaS solution for network management/IoT
Technologies: Kotlin, Spring Boot, Microservices, Angular/TypeScript, Hibernate, Jackson, PostgreSQL, JSON, XML, SAML2, OIDC/OAuth2, Keycloak, Gradle, Git, Kubernetes, Helm

Apr 2021 - Sep 2021

6 months

Principal Developer Operations Center

German Edge Cloud

Further development of a cloud management solution
Technologies: Kotlin, Spring Boot, jOOQ, PostgreSQL, JSON, Jackson, REST, HAL, Kubernetes, Helm, Terraform, cloud-init, Maven, Git

Mar 2021 - Jul 2021

5 months

Head of Security

comuny GmbH

Ensuring and advising the development team on product and operational security
Analyzing and aligning with external security and product requirements (BSI, gematik)
Technologies: Kotlin, Java, Spring Boot, Microservices, Angular/TypeScript, GCP, Hibernate, Jackson, PostgreSQL, JSON, JWT, REST, HAL, Swagger, Pact, OIDC/OAuth2, Keycloak, Android, Ionic, Gradle, GitLab-CI, Docker, Git, Threat Modeling

Mar 2021 - May 2021

3 months

Consultant

LANCOM

Evaluation and feasibility study of authentication technology options (SAML, OIDC/OAuth2) within a network management/IoT SaaS solution
Technologies: Kotlin, Spring, Microservices, Kubernetes, SAML 2.0, OIDC/OAuth2

Mar 2019 - Feb 2021

2 years

CTO / Fullstack Developer

comuny GmbH

Product design and development (backend, frontend, mobile), project and team management, and regular customer interaction
Architecture and implementation of a SaaS solution for identification and authentication (OIDC/OAuth2) with multiple microservices
Interface design and implementation
Security analysis and architecture
CI/CD
Successfully met high data protection and security requirements
Technologies: Kotlin, Java, Spring Boot, Microservices, Angular/TypeScript, GCP, Hibernate, Jackson, PostgreSQL, JSON, JWT, REST, HAL, Swagger, Pact, OIDC/OAuth2, Android, Ionic, Gradle, GitLab-CI, Docker, Git, Threat Modeling

Oct 2017 - Jul 2019

1 year 10 months

Product Owner / Fullstack Developer

LANCOM

Product Owner for two teams and coordination of multiple product owners
Feature and UX design
Fullstack development of authentication features, including interface and UI development, and end-to-end tests
Setting up a new location
Technologies: Java, Kotlin, Spring Boot, Microservices, Angular/TypeScript, Hibernate, Jackson, PostgreSQL, JSON, REST, Swagger, Gradle, Jenkins, Pact, Git

Aug 2015 - Sep 2017

2 years 2 months

Product Owner Wireless / Backend Developer

Sophos

Product Owner for five teams across three locations
Setting up a new site in India
Feature and UX design
Fullstack development of individual features, including interface design and development, for a network management/IoT SaaS
Technologies: Java, Spring, Microservices, REST, OAuth2, MongoDB, Redis, AWS, Git, Gradle, Bitbucket, Threat Modeling

Mar 2013 - Aug 2015

2 years 6 months

Senior Software Developer & Architect

Sophos

Backend development and architecture of a multi-tenant cloud application as SaaS in network management/IoT
Migrating an application from Ruby on Rails to Java/Spring
API design and development
Technologies: Java, Spring, Microservices, REST, OAuth2, Ruby on Rails, MongoDB, Redis, ElasticSearch, AWS, Wi-Fi, Git, Gradle, Bitbucket

Jan 2012 - Mar 2013

1 year 3 months

Remote

System z Firmware Architect

IBM

Architecture and development of firmware components for IBM System z in the networking area
Technical lead for a remote team in Moscow
Technologies: C++, C, Bash, Linux, RPM, SCons, CVS

Jan 2008 - Dec 2011

4 years

Team Lead / Firmware Engineer

IBM

Managing teams across multiple departments for local and distributed teams
Architecture and development of firmware components
Development of a virtualized test environment
Enhancing and maintaining critical development systems
Technologies: Groovy, Grails, Xen, C++, C, Bash, SAN, GPFS, Linux, Gradle, SCons, CVS

Mar 2003 - Dec 2007

4 years 10 months

System z Firmware Engineer

IBM

Architecture and development of firmware components for IBM System z in the networking area
Technologies: C++, C, Bash, Linux, RPM, SCons, CVS

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (22.5 years), Telecommunication (5 years), Professional Services (2.5 years), and Retail (0.5 years).

Information Technology

Telecommunication

Professional Services

Retail

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Product Development (20 years), Information Technology (17 years), Quality Assurance (4.5 years), Project Management (4 years), Human Resources (3.5 years), and Operations (1.5 years).

Product Development

Information Technology

Quality Assurance

Project Management

Human Resources

Operations

Summary

Backend developer with frontend experience
Kotlin/Java, Spring/Quarkus, Angular/Vue.js, SQL/NoSQL, Cloud
21 years of professional development experience in international and distributed teams
12 years of team leadership and project management experience
10 years in cloud and security, authentication/authorization
5 years certified Product Owner

Skills

Programming:

Java (>10 Years) ++++
Kotlin (7 Years) ++++
Spring (9 Years) +++
Quarkus (3 Years) +++
C/c++ (6 Years) +++
Groovy (4 Years) ++
Ruby On Rails (2 Years) ++
Typescript (4 Years) ++
Angular, Ionic (2 Years) ++
Vue.js (1 Year) ++
Android (1 Year) ++

Technologies:

Spring, Quarkus, Microprofile, Hibernate, Jackson, Rest, Hal, Swagger, Junit, Assertj, Pact, Selenium, Json, Jwt, Xml, Gradle, Maven, Make

Infrastructure:

Postgresql (6 Years) ++
Mariadb/mysql (5 Years) ++
Mongodb (5 Years) ++
Redis (3 Years) ++
Docker, Kubernetes, Helm (3 Years) ++
Gcp (1 Year) ++
Elasticsearch (4 Years) +
Aws (5 Years) +

Network:

Tcp/ip, Udp ++++
Wi-fi, Lan, Vlan ++++
Dns, Dhcp ++

Project Management:

Agile, Scrum, Kanban (11 Years) ++++
Product Owner (5 Years) ++++
Safe (5 Years) ++

Other:

Linux (21 Years) ++++
Git (11 Years) ++++
Tdd, Clean Code ++++
Oauth2, Oidc (6 Years) ++++
Keycloak (2 Years) +++
Security +++
Macos, Windows +++
Intellij, Eclipse +++
Jira, Confluence, Bitbucket +++
Gitlab, Github +++
Gitlab Ci, Github Actions, Jenkins +++
Ux Design (4 Years) ++

Languages

German

Native

English

Advanced

Education

Oct 2000 - Sep 2003

Berufsakademie Stuttgart

Diploma Engineer, Information Technology – Network and Software Engineering · Information Technology – Network and Software Engineering · Stuttgart, Germany · 1,3

Oct 1991 - Jul 1999

Wilhelm-Busch-Gymnasium Stadthagen

High School Diploma · Stadthagen, Germany · 1,7

Certifications & licenses

Certified Product Owner

Profile

Created

September 2023

Last Update

June 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Dirk based?

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

What languages does Dirk speak?

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

How many years of experience does Dirk have?

Dirk has at least 23 years of experience. During this time, Dirk has worked in at least 16 different roles and for 11 different companies. The average length of individual experience is 1 year and 3 months. Note that Dirk may not have shared all experience and actually has more experience.

What roles would Dirk be best suited for?

Based on recent experience, Dirk would be well-suited for roles such as: Senior Software Developer, Software Developer, Technical Interview Consultant.

What is Dirk's latest experience?

Dirk's most recent position is Senior Software Developer at congstar.

What companies has Dirk worked for in recent years?

In recent years, Dirk has worked for congstar, Anonymous Client, WorkGenius, OTTO, and JB10X.

Which industries is Dirk most experienced in?

Dirk is most experienced in industries like Information Technology (IT), Telecommunication, and Professional Services. Dirk also has some experience in Retail and Healthcare.

Which business areas is Dirk most experienced in?

Dirk is most experienced in business areas like Product Development, Information Technology (IT), and Quality Assurance (QA). Dirk also has some experience in Project Management, Human Resources (HR), and Operations.

Which industries has Dirk worked in recently?

Dirk has recently worked in industries like Information Technology (IT), Telecommunication, and Professional Services.

Which business areas has Dirk worked in recently?

Dirk has recently worked in business areas like Information Technology (IT), Human Resources (HR), and Product Development.

What is Dirk's education?

Dirk holds a Bachelor in Information Technology – Network and Software Engineering from Berufsakademie Stuttgart.

Does Dirk have any certificates?

Dirk has 1 certificate: Certified Product Owner.

What is the availability of Dirk?

Dirk is immediately available part-time for suitable projects.

What is the rate of Dirk?

Dirk's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.