Arkadius S. - Architect, Requirement Engineering, Senior Developer

Dortmund, Germany

Experience

Oct 2024 - Dec 2024

3 months

Architect, Requirement Engineering, Senior Developer

Bitmarck Holding GmbH

Focus: Account management system (KVS) for EPA V3 (ePa4All)
EPA V3 (Requirement Engineering for Ombudsman office, and creating technical user stories)
Contradictions/withdrawals by email/letter (large volume of transactional emails)
Coordination with other teams on interfaces, etc.
Designing a highly available, high-throughput solution on OpenShift and Java backend (microservices)
Tools used:
Java 17
Spring Boot 3
Spring Security 6
Keycloak (IAM)
Inxmail
IntelliJ
Maven
OpenShift
DB2
Jenkins
Microservices
JavaScript
Kubernetes
REST API
SOAP
OpenAPI
Helm charts
Liquibase
OAuth2
HTML
Thymeleaf

May 2024 - Sep 2024

5 months

Senior Full Stack Developer, Architect, DevOps, DevLead, Requirement Engineering

Bitmarck Holding GmbH

Focus: Account management system (KVS) for the TI Messenger
Implementing and extending microservices
Building infrastructure for deployment on OpenShift/Kubernetes including Jenkins pipelines
Integration with BitIAM, TI-M specialist service, Consent Keeper and FDV
Gathering requirements from DevOps operations and business units
Coordination with other teams on interfaces, etc.
Tools used:
Java 17
Spring Boot 3
Spring Security 6
Keycloak (IAM)
IntelliJ
Maven
OpenShift
Postgres DB
Jenkins
Microservices
Hibernate
Kubernetes
REST API
SOAP
OpenAPI
Helm charts
Liquibase
OAuth2

Oct 2022 - Apr 2024

1 year 7 months

Senior Full Stack Developer, DevOps

Bitmarck Holding GmbH

Focus: Account management system (KVS) for the ePA
Implementing and extending microservices
Deployment on OpenShift/Kubernetes
Continuous integration/Scrum
Use cases: health insurance merge, opt-out, final test, objection management
Automating integration tests
Feature enhancements, Spring Boot upgrades to version 3
Tools used:
Java 17
Spring Boot 3
Spring Security 6
JavaScript
Thymeleaf
Keycloak
IntelliJ
Maven
OpenShift
SQL DB2
Jenkins
Microservices
Hibernate
Kubernetes
REST API
SOAP
OpenAPI
Helm charts
Liquibase
OAuth2

Jan 2021 - Sep 2022

1 year 9 months

Senior Full Stack Developer, Product Owner

Signal Iduna Gruppe

Focus: Electronic patient record for private insured
Implementing microservices (backend and frontend)
Deployment on OpenShift
Product responsibility/tech lead
Continuous integration/Scrum
Tools used:
Java 11/17
DropWizard
Spring
Angular 12
TypeScript
IntelliJ
Gradle
OpenShift
MongoDB
Jenkins
Microservices
Docker
Apache Kafka
REST API
OAuth2
OpenAPI

Jan 2018 - May 2020

2 years 5 months

Senior Developer

Beutlhauser

Focus: Fleet management portal
Implementing features (backend and frontend)
Deployment on AWS
Implementing a PWA
Continuous integration/delivery
Tools used:
Java 8/9
Spring
Angular 7/8
TypeScript
WebStorm
Keycloak
Microservices
AWS
MongoDB
Elasticsearch
MySQL
IntelliJ
JasperReports
Gradle

Jun 2016 - Dec 2017

1 year 7 months

Hybrid

Senior Developer (Full Stack)

COMLINE Computer + Softwarelösungen AG for NAS (Startup)

Focus: Startup hybrid app (bundle) for Android and iOS, from infrastructure to implementation
Developing microservices for the CSP Java backend
Developing mobile app for Android and iOS
Building the cloud service platform infrastructure
Tools used:
Java
Spring Boot
TypeScript
Ionic Framework
Cordova
HTML5
CSS
IntelliJ
WebStorm
GitLab
Jira
Linux
Maven
Jenkins
MariaDB
MongoDB
Consul
Nginx
Docker

Apr 2016 - May 2016

2 months

Java Developer (Backend)

KION Group IT

Focus: Implementing web services for the entire Java backend
Software development with Java 8 and Criteria API
Implementing REST API (JSON)
Tools used:
Java Spring
IntelliJ
SVN
Jira
Linux
Maven
Liquibase
Swagger API

Nov 2015 - Dec 2015

2 months

Development Engineer (Frontend)

Sophos Technology GmbH

Focus: Frontend software development
Web development with AngularJS and Bootstrap
Implementing design specifications
Tools used:
AngularJS
Gradle
JavaScript
HTML5
CSS
Bootstrap
WebStorm
Git
Jira
Linux

Sep 2015 - Oct 2015

2 months

Development Engineer

Sophos Technology GmbH

Focus: Windows 10 Mobile support (MDM) in the Sophos Cloud
Software development with Java 7 Spring Framework (4.0)
Extending functionality to support Windows 10 mobile devices in the Sophos Cloud
Tools used:
Java
Spring
JUnit
Gradle
IntelliJ
MongoDB
Git
Bamboo
Jira
Linux
macOS
Apache Tomcat

Apr 2015 - Aug 2015

5 months

Development Engineer

Sophos Technology GmbH

Focus: Developing and implementing mobile security in the cloud
Software development with Java 7 Spring Framework (4.0)
Integrating Sophos Mobile Security into the Sophos Cloud
Version control with Git, build system with Bamboo (Atlassian)
Tools used:
Java
Spring
JUnit
Gradle
IntelliJ
MongoDB
Git
Bamboo
Jira
Linux
macOS
Apache Tomcat

Aug 2014 - Mar 2015

8 months

Development Engineer

Sophos Technology GmbH

Focus: Porting the mobile component to Java Sophos Cloud V3
Software development with Java 7 Spring Framework (4.0)
Implementing the “Mobile” component for Sophos Cloud V3 (AWS as IaaS)
Version control with Git, build system with Bamboo (Atlassian)
Tools used:
Java
Spring
JUnit
Gradle
IntelliJ
MongoDB
Git
Bamboo
Jira
Linux
macOS
Apache Tomcat

Jan 2014 - Jul 2014

7 months

Development Engineer

Sophos Technology GmbH

Focus: Software development for Sophos Cloud V2
Software development with Ruby
Developing the “Mobile” component for Sophos Cloud V2 (AWS as IaaS)
iOS and Android mobile device management (MDM)
Behavior-driven development with RSpec
Version control with Git, build system with Bamboo (Atlassian)
Tools used:
Ruby
RSpec
RubyMine
MongoDB
Git
Bamboo
Jira
Linux
Redis

Jan 2013 - Dec 2013

1 year

Application Support Engineer

Experian GmbH (E-Mail Marketing Services Provider)

Focus: Transitioning the ticket system to ITIL, process definition
ITIL management (process optimization)
Incident management
Supporting the email marketing services platform (CCMP and MailSolution)
Introducing new processes
Ensuring SLAs and processes follow ITIL
Customizing the internal ticket system with JavaScript and automated bash scripts for communication and file backup
Creating IBM Crystal Reports templates
Tools used:
UML
MS Office
HTML
CCMP (Cross-Channel Marketing Platform)
Jira ticket system
JavaScript
Bash
MySQL
IBM Crystal Reports

Nov 2012 - Nov 2012

1 month

System Administrator

Ceteq GmbH

Focus: Software distribution with Opsi server
Setting up network infrastructure and installing the Opsi server
Configuring DHCP for PXE client machines
Integrating netboot products for WinXP and Win7
Deploying software products automatically
Training staff on Opsi server maintenance
Tools used:
Opsi server integration
Ubuntu
Windows Server 2008 R2
VMware vSphere
VMware ESX
Windows XP
Windows 7
DHCP
PXE

Aug 2012 - Oct 2012

3 months

Test Specialist

E-Plus

Focus: Reviewing specification documents and test scenarios/test cases for a service data management application
Reviewing based on specifications, mapping matrix, test cases, component test scenarios for existing application
Checking documents for quality and completeness
Providing improvement suggestions
Tools used:
MS Office

Jul 2012 - Jul 2012

1 month

Software Developer, Software Tester, System Engineer

Software-Datenlieferant (TecDoc)

Focus: Interface development, setting up a test environment
Evaluating SoapUI and LoadUI, connecting to web service backend with custom Groovy scripts
Developing/implementing Groovy scripts for web service communication
Integrating Groovy scripts into SoapUI
Creating methods for session handling in SoapUI/Groovy scripts
Parameterizing scripts
Connecting to LoadUI and evaluating it
Load testing with virtual users in a suitable environment
Tools used:
Groovy
SoapUI
LoadUI
Eclipse
Charles Proxy
JBoss Server

Apr 2011 - Dec 2011

9 months

Dortmund, Germany

Software Developer, System Engineer

TU Dortmund

Focus: Software development, software architecture, database management
Implementing CDMI support by combining existing OpenNebula components
Designing an architecture where a web interface communicates via OCCI/CDMI to OpenNebula
Adapting open-source OCCI and CDMI server variants for this architecture
Implementing CDMI and NFS protocol for OpenNebula to support additional clouds
Evaluating the architecture in a test environment
Tools used:
Ruby
JSON
Java
Bash scripts
KVM
REST
Subversion
Git
SLES
Ubuntu
MySQL
OCCI
CDMI
OpenNebula
Eclipse
Apache Tomcat

Jul 2010 - Sep 2011

1 year 3 months

Dortmund, Germany

System Administrator, Software Developer

TU Dortmund

Focus: Administering a complex IT infrastructure in high performance computing
Managing hardware and software for the TU Dortmund cloud computing testbed of over 250 HP blade servers
Administering DHCP and LDAP infrastructure
Managing Ubuntu and SUSE Enterprise systems
Virtualization with KVM, optimizing for high performance computing
Managing the virtual infrastructure with OpenNebula cloud framework
Creating documentation and installation guides
Tools used:
Ubuntu
SLES
DHCP
LDAP
KVM
OpenNebula
Ruby
Bash scripts

Jul 2010 - Aug 2010

2 months

Dortmund, Germany

Student Assistant

RIF e.V. (Dortmund initiative for computer-integrated manufacturing)

Focus: Upgrading projection technology for virtual reality (in-house and for clients)
Rebuilding hardware
Setting up network
Reconfiguring Windows
Building server and network infrastructure
Maintaining projectors
Tools used:
Windows Server 2008
Linux

Mar 2010 - Mar 2011

1 year 1 month

Dortmund, Germany

Software Developer, System Engineer, System Administrator

TU Dortmund

Focus: Management portal: Creating, monitoring, and controlling virtual machines with an intuitive web portal
Resource management: Automating VM context distribution and network balancing, migrating VMs to virtualized servers and VMware, Xen
Resource forecasting: Advising users on VM specs (RAM, CPUs, disk size, etc.) and simulating support on physical servers for future hardware planning
Java development of the web portal and backend
Setting up the test environment for the web portal
Setting up cloud environments and installing required hardware and OS
Debugging OpenNebula
Code refactoring and bug fixing
Tools used:
Eclipse
VMware ESXi
ZK Framework
KVM
LDAP
OpenNebula
VPN
VNC
Java
Subversion
Bash scripts
MySQL server
SQL
Apache Tomcat