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 , 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 , and Quality Assurance . Dirk also has some experience in Project Management , Human Resources , and Operations .

Q: Which industries has Dirk worked in recently?

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

Q: Which business areas has Dirk worked in recently?

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

Recommended expert

Birkenfeld, Germany

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Experience

May 2024 - Present

2 years 2 months

Senior Software Developer

congstar

Mobile app backend development for end-customer mobile management
Implementation of authentication methods
Conversion of a monolith into 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

Optimization of GitLab pipelines
Creation of training materials in the context of OpenID and gematik
Technologies: GitLab, GitLab CI, Java, Kotlin, TypeScript, Spring, Quarkus, Angular, Keycloak, OAuth, OpenID, gematik

Nov 2023 - Present

2 years 8 months

Technical Interview Consultant

WorkGenius

Conducting interviews focusing on technology topics
Technologies: Java, Kotlin, various technical topics

Aug 2023 - Apr 2024

9 months

AWS/Kotlin Developer

OTTO

Full-stack development including DevOps in product categorization for e-commerce
Migration 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 back-end and front-end 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 consulting on addressing identified 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 in mobile network management for end customers
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

Integration of 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 development on product and operational security
Analysis and alignment 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 technology options in the field of authentication (SAML, OIDC/OAuth2) within a SaaS solution for network management/IoT
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) as well as project and team management and regular customer contact
Architecture and implementation of a SaaS solution for identification and authentication (OIDC/OAuth2) with multiple microservices
API/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 functions including API and UI development as well as 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 location in India
Feature and UX design
Fullstack development of individual features including API design and development for a SaaS solution in network management/IoT
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 the field of network management/IoT
Migration of 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

Firmware Architect System z

IBM

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

Jan 2008 - Dec 2011

4 years

Team Lead / Firmware Developer

IBM

Led teams across multiple departments, both local and distributed
Architecture and development of firmware components
Development of a virtualized testing environment
Further development and maintenance of critical development systems
Technologies: Groovy, Grails, Xen, C++, C, Bash, SAN, GPFS, Linux, Gradle, SCons, CVS

Mar 2003 - Dec 2007

4 years 10 months

Firmware Developer System z

IBM

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

Industry Experience

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

Experienced in Information Technology, Telecommunication, Professional Services, and Retail.

Information Technology

Telecommunication

Professional Services

Retail

Business Area Experience

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

Experienced in Product Development, Information Technology, Quality Assurance, Human Resources, Project Management, and Operations.

Product Development

Information Technology

Quality Assurance

Human Resources

Project Management

Operations

Summary

Backend developer with front-end 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 as a 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) +

Networking:

Tcp/Ip, Udp ++++
Wi-Fi, Lan, Vlan ++++
Dns, Dhcp ++

Project Management:

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

Others:

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

Stuttgart Cooperative State University

Diploma in Engineering, specializing in Information Technology – Network and Software Engineering · Information Technology – Network and Software Engineering · Stuttgart, Germany · 1.3

Oct 1991 - Jul 1999

Wilhelm Busch High School, Stadthagen

Abitur · Stadthagen, Germany · 1.7

Certifications & licenses

Certified Product Owner

Statistics

Experience

Total positions 19

Experience in Information Technology 23 y

Avg length 1 y 6 m

Longest experience 4 y 9 m

Expertise

Recent roles Senior Software Developer, Software Developer, Technical Interview Consultant

Main industries Information Technology, Telecommunication, Professional Services

Main business areas Product Development, Information Technology, Quality Assurance

Qualifications

Highest degree Bachelor

Certifications earned 1

Profile

Created

September 2023

Last Update

June 2026

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Frequently asked questions

Have questions? Find more information here.

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, 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, and Quality Assurance. Dirk also has some experience in Project Management, Human Resources, and Operations.

Which industries has Dirk worked in recently?

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

Which business areas has Dirk worked in recently?

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

What is Dirk's education?

Dirk holds a Bachelor in Information Technology – Network and Software Engineering from Stuttgart Cooperative State University.

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.