Lead Full Stack Developer

6/2021 – offen

Design and develop a new reactive backend for social media applications as a replacement of the original async backend based on Javalin and CompletableFuture. After analyzing the requirements for the application and the existing application, I developed a new application based on Java 11 with a reactive stack - SpringWebFlux.
Responsible for the entire project life cycle, from requirements gathering, architecture, and implementation to cloud configuration and support.

Responsibilities:
- Developing features and fixing bugs using Java 11 and SpringWebFlux.
- Unit and e2e tests on the backend.
- Configuring CI/CD by AWS CodePipeline with Fargate.
- Code review.

In this project were used: Java 11, Spring Boot, Project Reactor, Lombok, JUnit, Reactor Test, Gradle, OAuth 2, Cassandra, Docker, AWS.

Amazon Web Services (AWS), Docker, Java (allg.)

4/2018 – 6/2021

Develop and maintain various micro-services for product -Hyperlink entfernt-.
Most micro-services are based on Java8, Spring, SpringBoot for the backend and AngularJS for front end.

Responsibilities:
- Developing features and fixing bugs using Java 8.
- Developing features and fixing bugs using AngularJS. - Unit and e2e tests both on backend and frontend.
- Code review.

In this project were used: Java 8, Spring, Spring Boot, Feign, JUnit, AssertJ, Maven, AngularJS, TypeScript, Karma, Jasmine, NodeJS, NPM, Yarn, Swagger, MongoDB, Kafka, Jenkins, JFrog, NewRelic, PaperTrail, Docker, Kubernetes, AWS, AWS Serverless.

Design and development brand new micro-services for replacing previous frontend and backend for product -Hyperlink entfernt-.
Two micro-services was develop completely from scratch. Angular 11 for frontend and Spring Boot with Project Reactor for backend.

Responsibilities:
- Prototyping and first implementation.
- Developing features using Java 11, Kotlin and SpringWebFlux. - Developing features using Angular 11.
- Unit and e2e tests both on backend and frontend.
- Code review.

In this project were used: Java 11, Kotlin, Spring Boot, Project Reactor, Feign, JUnit, AssertJ, Maven, Angular 11, TypeScript, Karma, Jasmine, NodeJS, Yarn, Angular-CLI, MongoDB, Jenkins, JFrog, NewRelic, PaperTrail, Docker,Kubernetes, AWS, AWS Serverless.

Angular, Java (allg.), Apache Kafka, Kubernetes, Mongodb, Spring Framework

3/2016 – 4/2018

Design and development of web application for maintenance of communication stations. The server side was developed on Grails and was engaged in providing data from SAP. The client side was developed on Angular 1.6 using TypeScript.

Responsibilities:
- Developing features using Groovy(Closures, DSL, AST transformations), Grails(Plugins, GORM, GSP).
- Developing features using AngularJS 1.6 with TypeScript. - Unit and e2e tests both on backend and frontend.
- Developing code architecture.
- Configuring Jenkins for CI and automating deployments. - Configuring ELK-stack.
- Interviewing candidates. - Mentoring juniors.
- Reviewing code.

In this project were used: Groovy, Grails, Angular, TypeScript, REST, Gradle, Spock, Geb, Jasmine, Karma, NodeJS, NPM, Swagger, ELK-stack(Elasticsearch, Logstash, Kibana).


Design and development WEB-administration panel for service paketchef.de. The server side was developed on Java 8 and Spring Boot. The client side was developed on Vue.js.

Responsibilities:
- Developing features using Java 8 (Streams API, Lambda).
- Developing features using Vue.js.
- Unit and e2e tests both on backend and frontend.
- Developing code architecture.
- Configuring Jenkins for CI and automating deployments.

In this project were used: Java 8, Spring Boot, Hibernate, PostgreSQL, Vue.js, REST, Gradle, JUnit, NodeJS, NPM, Jasmine, Karma, Nightwatch.js, Webpack, ESLint.


Design and development Cloud Billing project. This project was developed in the micro-service architecture. I developed a micro-service for a public API. This micro- service works on Java 8 and Spring Boot.

Responsibilities:
- Developing features using Java 8 (Streams API, Lambda). - Unit and e2e tests on backend.
- Developing code architecture.

In this project were used: Java 8, Spring Boot, Spring Batch, MongoDB, Redis, KeyCloak, KillBill, Swagger, REST, Maven, JUnit, Docker, Jenkins, Nexus.

Java (allg.)