Christof Nasahl
Senior Developer
Experience
May 2023 - Sep 2023
5 monthsSenior Entwickler
Otto GmbH
- Further development of personalized ad spaces in the Otto web shop.
- Full-stack development.
- Work is Kanban-driven in a team of about 15 people.
- Technologies: microservices, Kotlin, Spring, Spring Boot, Gradle, MongoDB, HTML, JS, Node, SCSS, AWS.
- Development process: Kanban; continuous integration with AWS CodePipeline and GitHub Actions.
Mar 2022 - Mar 2023
1 year 1 monthSenior Entwickler
TUI GmbH
- Development and operation of the 'search queries for hotel bookings' component within the microservice-based landscape.
- Development: Java 17, Spring, Spring Boot, Gradle, Kafka, Kinesis, Cucumber, Swagger, Quarkus.
- DevOps: Docker, Kubernetes, Terraform, continuous integration with GitLab CI, DataDog.
- AWS Cloud: EC2, Lambda, Parameter Store, S3, CloudWatch, SNS, SQS, DynamoDB, Redis, Aurora, Athena.
- Development process: Scrum.
Sep 2020 - Feb 2022
1 year 6 monthsSenior Entwickler
Otto GmbH
- Redevelopment of the delivery address page for Otto's online shop.
- Setting up the needed microservice as an EC2 instance in AWS Cloud.
- Designing the UI using the company's internal pattern library.
- Conducting a POC to optimize MongoDB.
- Technologies and tools used: Java 11, Scala, Spring, Spring Boot, Gradle, HTML, JS, Node, SCSS, Selenium, Backstop, AWS (EC2, S3, CloudWatch, CloudFormation, SNS, SQS, Lambda, …), MongoDB, Kibana, Grafana.
- Development process: Scrum; continuous integration with Jenkins.
Jul 2020 - Present
5 years 1 monthSenior Entwickler
Essendi it GmbH
- New development of the return channel for communication from financial service providers to tax firms.
- Technologies and tools used: Java 11, Spring, Spring Boot, web services (WSDL/SOAP + REST), Cucumber, Selenium, HTML, JS, Apache CXF, Maven, Bamboo, Docker, AWS (EC2).
- Development process: Kanban.
Dec 2018 - Apr 2020
1 year 5 monthsSenior Entwickler
Loyalty Partner Solutions
- Defining the design and initial implementation of a test framework for Lufthansa's Miles&More customer project with the following requirements.
- Connecting all service interfaces of the Miles&More application: SOAP, REST, EJB, DB.
- Specific needs for UI tests with Selenium are covered.
- Supporting the QA team in the tool rollout.
- Also implementing user stories for the Miles&More project.
- Technologies and tools used: WebSphere, Oracle, Hibernate, AspectJ, SOAP, REST, Java 8, Java 11, JavaFX, Kotlin, Oracle, JUnit 5, Selenium, Git, IntelliJ.
- Development process: Scrum; continuous integration with Jenkins.
Jul 2016 - Dec 2019
2 years 6 monthsSenior Entwickler
AVL DiTEST
- Development of a vehicle diagnostic system for Jaguar/Land Rover.
- Technologies used: Java 8, Eclipse/RCP, Eclipse/EMF, JUnit, Mockito, Maven, Subversion.
- Development process: TDD; Scrum; continuous integration with Jenkins.
- New development of a UI test suite for corporate projects based on Selenium.
- Since 2018: migrating the codebase from Subversion to Git with Bitbucket.
Sep 2011 - Apr 2016
4 years 8 monthsSenior Entwickler
Siemens
- Development of a hazard alert system for buildings.
- Technologies: Java/J2EE, Eclipse/RCP, Eclipse/EMF, JBoss, Hibernate, JUnit, Maven, Subversion.
Jul 2009 - Aug 2011
2 years 2 monthsSenior Entwickler
Rohde&Schwarz
- Development of a system architecture for military radios.
- Technologies used: Visual Studio, C++, cross compilers, …
Jul 2008 - Jun 2009
1 yearSW Entwickler
Rohde&Schwarz
- Refactoring a GUI application for configuring measuring instruments.
- Technologies used: C++, STL, Qt, Perl, Enterprise Architect, PC-Lint, ClearCase.
Jan 1999 - Jun 2008
8 years 6 monthsSW Entwickler und Architekt
Siemens/NSN
- Worked on an international large-scale mobile communications project.
- Technologies used: C++, CORBA, Java, Eclipse RCP, unit tests, Scrum.
Mar 1998 - Dec 1999
1 year 10 months Munich, Germany
SW Entwickler und Architekt
Siemens
- Contributed to an O&M project for mobile communications.
- Technologies: C++, OOA/OOD, design patterns, CORBA, Sun Solaris.
Oct 1995 - Feb 1998
2 years 5 months Erlangen, Germany
SW Entwickler
Siemens
- Development of a framework for process automation in hot rolling mills.
- Technologies: C++, OOA/OOD, design patterns, CORBA, Sun Solaris.
Dec 1993 - Sep 1995
1 year 10 months Erlangen, Germany
Vertrieb
Siemens
- Sales activities and project management for Heavy Rails (i.e. metros) in China.
Apr 1993 - Nov 1993
8 months Beijing, China
Vertrieb/Marketing
Siemens
- Third station of an internal trainee program: developing a market entry concept for the Chinese paper industry; sales activities.
Sep 1992 - Mar 1993
7 months Erlangen, Germany
Marketing
Siemens
- Second station of an internal trainee program: working on strategic marketing projects in water management.
Dec 1991 - Aug 1992
9 months Fürth, Germany
Entwicklung
Siemens
- First station of an internal trainee program: advancing the neural network used in a rolling mill.
Nov 1990 - May 1991
7 months Fürth, Germany
Entwicklung
Siemens
- Development of a neural network for controlling rolling mills.
Summary
Senior Developer with knowledge of current common technologies in the Java/Kotlin development environment: microservices, Spring Boot, REST, application servers, Maven, Gradle, Subversion, Git, Jenkins, … My focus over the last projects has been on developing microservice architectures using AWS Cloud. My solid experience in building large, long-living software projects helps me define practical architectures and integrate the right frameworks.
Languages
German
Native
English
Advanced
Chinese
Intermediate
Education
Nov 1984 - Nov 1990
Friedrich-Alexander University Erlangen
Diploma in Computer Science and Sinology · Computer Science · Erlangen, Germany · 1.7
Certifications & licenses
iSAQB Software Architecture – Foundation Level
iSAQB
ISTQB Certified Tester Foundation
ISTQB
AWS Certified Solutions Architect - Associate
AWS
OMG Certified UML Professional Fundamental
OMG
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