Christof Nasahl - Senior Java/Kotlin Developer, AWS

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Munich, Germany

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Experience

May 2023 - Sep 2023

5 months

Senior Developer

Otto GmbH

Further development of personalized advertising spaces on the Otto web shop
Full-stack development in a Kanban-driven 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 month

Senior Developer

TUI GmbH

Development and operation of the 'search queries for hotel bookings' component within the microservice-based system 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 months

Senior Developer

Otto GmbH

New development of the delivery address page for Otto's online shop
Setting up the required microservice as an EC2 instance in the AWS Cloud
Designing the user interface 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

6 years 2 months

Senior Developer

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 months

Senior Developer

Loyalty Partner Solutions

Defining the design and initial implementation of a test framework for Lufthansa's Miles & More customer project with the following requirements:
Integration of all service interfaces of the Miles & More application: SOAP, REST, EJB, DB
Covered specific requirements for UI tests with Selenium
Supported the QA team in tool adoption
Implemented 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 2018

2 years 6 months

Senior Developer

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 enterprise projects based on Selenium
Migration of the codebase from Subversion to Git with Bitbucket since 2018

Sep 2011 - Apr 2016

4 years 8 months

Senior Developer

Siemens

Development of a building hazard alert system
Technologies: Java/J2EE, Eclipse/RCP, Eclipse/EMF, JBoss, Hibernate, JUnit, Maven, Subversion

Jul 2009 - Aug 2011

2 years 2 months

Senior Developer

Rohde & Schwarz

Development of a system architecture for military radios
Technologies used: Visual Studio, C++, Cross Compiler

Jul 2008 - Jun 2009

1 year

Software Developer

Rohde & Schwarz

Refactoring of a GUI application for configuring measurement devices
Technologies used: C++, STL, Qt, Perl, Enterprise Architect, PC-Lint, ClearCase

Jan 2000 - Jun 2008

8 years 6 months

Software Developer and Architect

Siemens/NSN

Contributed to an international large-scale project in mobile communications
Technologies used: C++, CORBA, Java, Eclipse RCP, Unit Tests, Scrum

Mar 1998 - Dec 1999

1 year 10 months

SW Developer and Architect

Siemens Munich

Worked on an O&M project for mobile communications
Technologies: C++, OOA/OOD, Design Patterns, CORBA, Sun Solaris

Oct 1995 - Feb 1998

2 years 5 months

SW Developer

Siemens Erlangen

Developed a framework for process automation of hot rolling mills
Technologies: C++, OOA/OOD, Design Patterns, CORBA, Sun Solaris

Dec 1993 - Sep 1995

1 year 10 months

Sales

Siemens Erlangen

Sales activities and project management for heavy rails (metros) in China

Apr 1993 - Nov 1993

8 months

Sales/Marketing

Siemens Beijing

Developed a concept for market entry into the Chinese paper industry
Sales activities

Sep 1992 - Mar 1993

7 months

Marketing

Siemens Erlangen

Worked on strategic marketing projects in water management

Dec 1991 - Aug 1992

9 months

Development

Siemens Fürth

Further development of the neural network used in a rolling mill

Nov 1990 - May 1991

7 months

Development

Siemens Fürth

Development of a neural network for controlling rolling mills

Industry experience

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

Experienced in Telecommunication, Banking and Finance, Information Technology, Construction, Manufacturing, and Aerospace and Defense.

Telecommunication

Banking and Finance

Information Technology

Construction

Manufacturing

Aerospace and Defense

Business area experience

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

Experienced in Information Technology, Product Development, Quality Assurance, Production, Sales, and Project Management.

Information Technology

Product Development

Quality Assurance

Production

Sales

Project Management

Summary

Senior developer with experience in the currently common technologies in the Java/Kotlin development environment: Microservices, Spring Boot, REST, application servers, Maven, Gradle, Subversion, Git, Jenkins, …

My focus in recent projects has been on developing microservice architectures using the AWS Cloud.

My solid experience in developing large, long-lived software projects helps me define practical architectures and integrate suitable frameworks.

Languages

German

Native

English

Advanced

Chinese

Elementary

Education

Nov 1984 - Nov 1990

Friedrich-Alexander University Erlangen

Diploma in Computer Science · Computer Science, minor in Sinology · Erlangen, Germany · 1.7

Certifications & licenses

OMG Certified UML Professional Fundamental

Statistics

Experience

Total positions 17

Experience in Telecommunication 10.5 y

Avg length 2 y 2 m

Longest experience 8 y 5 m

Expertise

Recent roles Senior Developer, Software Developer, Software Developer and Architect

Main industries Telecommunication, Banking and Finance, Information Technology

Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Highest degree Master

Certifications earned 4

Profile

Member since

September 2023

Last update

November 2024

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Frequently asked questions

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Christof is based in Munich, Germany.

Christof speaks the following languages: German (Native), English (Advanced), Chinese (Elementary).

Christof has at least 35 years of experience. During this time, Christof has worked in at least 9 different roles and for 12 different companies. The average length of individual experience is 2 years. Note that Christof may not have shared all experience and actually has more experience.

Based on recent experience, Christof would be well-suited for roles such as: Senior Developer, Software Developer, Software Developer and Architect.

Christof's most recent position is Senior Developer at Otto GmbH.

In recent years, Christof has worked for Otto GmbH, TUI GmbH, and Essendi it GmbH.

Christof is most experienced in industries like Telecommunication, Banking and Finance, and Information Technology. Christof also has some experience in Construction, Manufacturing, and Metals and Mining.

Christof is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Christof also has some experience in Sales, Production, and Project Management.

Christof has recently worked in industries like Banking and Finance, Information Technology, and Retail.

Christof has recently worked in business areas like Information Technology, Product Development, and Marketing.

Christof holds a Master in Computer Science, minor in Sinology from Friedrich-Alexander University Erlangen.

Christof has 4 certificates. Among them, these include: iSAQB Software Architecture – Foundation Level, ISTQB Certified Tester Foundation, and AWS Certified Solutions Architect - Associate.

The availability of Christof needs to be confirmed.

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Daily rate avg. 796 €

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Median rate 800 €

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Calculated based on our freelancers’ daily rates as of 25 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.