Lead Software Engineer, Software Architekt, Consultant

New Media Exchange Service
Definition of architecture, designing and implementing a new service using AWS cloud for handling partners and large media data transfers.
(Golang, Docker, Cloud Architecture, AWS, Terraform, ECS, Fargate, Postgres, S3, AWS-SSM, Route53, LoadBalancer, REST, OpenAPI, JWT)

New Partner-Portal
Designing and implementing a new portal for dealing with partners and large media data.
(Golang, Svelte, TypeScript, Javascript, Docker, AWS, REST, OpenAPI, JWT, HTML)

New Admin-Portal
Designing and implementing a new admin portal for managing partners and large media
data.
(Golang, Svelte, TypeScript, Javascript, Docker, AWS, REST, OpenAPI, JWT, HTML)

New backend infrastructure for dealing with carbon credits persisted on blockchain
Definition of architecture, interfaces and data flows. Implementation of backend
microservices that handle blockchain data for carbon credits and provide consumer facing
API.
https://www.atem.green
(Golang, Gin, Ginkgo, MicroService, Docker, AWS, CDK, TypeScript, ECS, Fargate, GraphQL,
REST, OpenAPI, Postgres)

Service security architecture
Designing and implementing token based authentication and roles- and permission concept to meet special customer requirements. Providing a consumer facing API.
(Golang, Gin, Ginkgo, MicroService, Docker, JWT, AWS, CDK, TypeScript, ECS, Fargate, REST, OpenAPI, Postgres)

New search service for projects tokens
Aggregation of different sources using GraphQL.
(Go (Golang), Gin, Ginkgo, MicroService, Docker, AWS, CDK, TypeScript, ECS, Fargate,
GraphQL, REST, OpenAPI, Postgres)

New service for users and accounts
Designing and implementing microservice and infrastructure for maintaining accounts and
users tailored to meet special requirements. Implementing various flows for user handling
by leveraging SendGrid.
(Go (Golang), Gin, Ginkgo, MicroService, Docker, JWT, SendGrid, AWS, CDK, TypeScript, ECS, Fargate, REST, OpenAPI, Postgres)

Shipment Tours for Customs
Implementing new features in a microservice architecture for shipment tours for customs.
(Kotlin, Java, Spring Boot, AWS, Kubernetes, Docker, Postgres, OpenAPI, REST, Kanban)

Currency transition for export/import countries for customs
Refactoring components, Testing with other teams
(Kotlin, Java, Spring Boot, AWS)

Observability for Microservices
Instrumenting Microservices to create telemetry data
(Kotlin, Java, Spring Boot, AWS, OpenAPI, REST, OpenTelemetry, LightStep)

Data for enabling customs declarations for a new country
Define data format, create exporter and provide data for 3rd party customs service provider
(Python, Java)

Online Service for freelancers - setup infrastructure
Design a web portal for supporting freelancers. Create backend infrastructure in the cloud,
set up build pipeline and continuous deployment. Implement user management and
corresponding flows (e.g. registration).
(Go, Gin, React, TypeScript, AWS RDS, AWS Aurora, S3, KMS, Encryption, CDK, Docker, MySQL, REST, OpenAPI, Bootstrap, HTML, CSS, DroneIO)

Online Service for freelancers - time tracking and invoicing
Define architecture, design and implement time tracking and invoicing.
(Go, Gin, React, TypeScript, AWS RDS, AWS Aurora, S3, KMS, Encryption, CDK, Docker, MySQL, REST, OpenAPI, Bootstrap, HTML, CSS)

Online Service for freelancers - profile generation and CRM
Design and implement service for generating profiles for freelancers and customer
relationship management.
(Go, Gin, React, TypeScript, AWS RDS, AWS Aurora, S3, KMS, Encryption, CDK, Docker, MySQL, REST, OpenAPI, Bootstrap, HTML, CSS)

User Identity Services Migration
Migration of existing monolithic service to new microservice architecture in AWS, API design
https://www.otto.de/user/login
(Kotlin, Go, Java, Python, TypeScript, JavaScript, AWS, EC2, SQS, SNS, Cloud Formation, Lambda, Spring Boot, Reactor, Varnish, Reactive Programming, Github Actions, Docker, Gradle, Test NG, JUnit, Jest)

Introduction of DynamoDB as new Database Technology
Research of different database technologies based on given requirements, creating PoC,
coaching the team and implemention to use DynamoDB
(Spring Boot, Reactive Programming, AWS, DynamoDB, DocumentDB, Amazon RDS, Aurora, MongoDB, Cloud Formation)

Migration of different user flows
Migration of different existing flows based on new architecture
(Kotlin, AWS, Lambda, S3, Serverless, Cloud Formation, Github Actions)

Migration IP-Blocklist
Rework existing IP-Blocklist generator
(Python, AWS, Lambda, S3, Serverless, Cloud Formation, Github Actions)

Email Notifications for Upcoming Physical Letters
Development of micro services based on the ePost platform
https://www.deutschepost.de/de/b/briefankuendigung.html
(Java, Kotlin, Spring Boot, Kubernetes, Groovy, RESTful Services, NodeJS, Docker, Redis,
Hibernate, Gradle, Maven, Oracle, Splunk, JUnit, Spock, WireMock, Quartz, Encryption, PKI, DKIM-Signature, Consul, Puppet, Vagrant)

Service for Delivery Date Calculation
Implementation of Micro-Service to calculate expected delivery date for physical letters
(Java, Kotlin, Spring Boot, Groovy, RESTful Services, NodeJS, Docker, Gradle, Splunk, JUnit,
Spock, WireMock, Puppet, Vagrant)

Fraud Management Tools
Development and maintenance of existing infrastructure
(Java, Groovy, Spring Boot, AWS Cloud, Kafka, Docker, Gradle, PostgreSQL, Splunk, JUnit,
RESTful Service)

Authentication System Migration
Switch internal tool for authentication/authorization to a new single sign on service
(Java, Spring Boot, SAML, Single Sign On using Okta)

Integration Risk Assessment Service
Integration of risk bureau service into internal tool for different countries
(Java, Groovy, Spring Boot, RESTful Service)

Car Trading Platform
Development of microservice architecture for different countries Launch of kijijiautos in
Canada
https://www.kijijiautos.ca
(Java, Spring Boot, Gradle, Karate, BDD, MongoDB, Hibernate, MySQL, JWT, RESTful Service, KeyCloak, Swagger/OpenAPI, Docker, JUnit, Wiremock, Kibana)

Authentication System Migration
Switch internal tool to a new single sign on service
(Java, Spring Boot, SAML, Single Sign On using Okta)

Application for managing merchants
Development of internal admin tool to manage merchant data
(Java, Spring Boot, Gradle, MongoDB, JWT, RESTful Service, KeyCloak, Swagger/OpenAPI,
Docker, JUnit, Wiremock)

PayPal Working Capital
Portal extension for merchant loans for german market
https://www.paypal.com/webapps/workingcapital
(Java, JavaScript, NodeJS, AngularJS, KrakenJS, Jasmine, Grunt, Micro Services)

Working Capital Administration Tool
Application for managing merchant loans
(JavaScript, AngularJS, NodeJS, KrakenJS, Single Sign On, Jasmine, Grunt)

PayPal Plus
Generic solution for integrating wallet with different payment providers into shop pages
https://www.paypal.com/de/webapps/mpp/paypal-plus
(JavaScript, NodeJS, KrakenJS, Jasmine, Grunt, Micro Services)

Component Testing Tool
Development of a tool to test microservices in PayPal infrastructure and presentation to
teams in USA
(Java, Maven, JSON, REST, Oracle)

PayPal Invoice (Rechnungskauf)
Development of REST-Services in a microservice architecture
https://www.paypal.com/de/webapps/mpp/invoice
(PHP, Phing, RESTful Services, JSON)

PayPal Payment Checkout
Development of different requirements to in PayPal checkout flow
(JavaScript, AngularJS, NodeJS)

Integration payment provider BillSAFE
Utilizing PayPal risk engine in BillSAFE
(Java, Spring, Oracle, Stored Procedures, Blaze Rule Engine, PHP, MySQL)

Development of new CMS for a big publishing company
CMS for managing different portals representing pharmacy magazines
https://www.apotheken-umschau.de
(Java, Grails, Groovy, CAS, SEO)

Community functionality for CMS for a big publishing company
Development of new community functionality based on Enterprise CMS "First Spirit"
https://www.apotheken-umschau.de
(Java, JSP, HTML, Maven, First Spirit, Single Sign On)

Job Portal
Relaunch and feature development
https://www.jobs.de
(Java, Spring, Spring Security, Spring Webflow, JSP, SOAP, HTML, CSS)

Medical Doctor Portal
Relaunch and feature development
https://www.docinsider.de
(Grails, Groovy, Hibernate, MySQL, HTML, CSS, JavaScript, SEO)

Electronic patient file ("Elektronische Patientenakte")
Development of a electronic patient file and representing it at exhibition Medica
(Java, Spring, Spring Security, Hibernate, MySQL, Apache JackRabbit, MagicDraw, Eclipse
RCP)

Registry for medical doctor offices ("Praxisregister")
(Java, Spring, Spring Webflow, Spring Security, Hibernate, MySQL)

XML-Interfaces for medical documentation
Definition of formats for exchanging medical and implementation of validation
(Java, XML)

Further analysis of software for creating and maintaining XML-Interfaces
Development of a prototype for presentation
(XML, UML, Java, JavaScript, CSS, HTML)