Qualifications
Expert
Java, Kotlin, Spring Boot, Analytical thinking, Mentoring and coaching, Leadership, Software architecture, Distributed systems, Microservices, Implementation, Debugging, Docker, Cloud (AWS), REST, Terraform, Git, Requirements Engineering, JetBrains products, SQL, Code Reviews, SCRUM, Refactoring, REST, API Design
Professional
Domain-Driven Design, Serverless, Project management, Testing, Linux, Go, MongoDB, Cassandra, Neo4J, Implementation and analysis of algorithms, Atlassian products (JIRA, Confluence)
Basic
Haskell, React, JavaScript, TypeScript, Python, C#, .NET Core, gRPC, Angular, Pulumi
Languages
- German: native speaker
- English: professional proficiency
Project list
02/2024 – today | Senior Java Software Engineer (Freelance)
- Extending the company-specific framework to measure capacity impact of DynamoDB calls to reduce costs
- Adding JavaScript support to the client’s scripting engine
- Developing a custom VSCode extension to support an internal configuration language with validation and auto-completion
- Analysis and documentation of SQS performance problems
- Add security to existing endpoints via Bewit and Hawk protocol
- Convert legacy infrastructure as code setup to CDK for AWS
- Adding brute force prevention to an authentication service
- Implementation of smaller features and anaysis and fixing of bugs
Keywords: Java (17, 21), AWS, SQS, DynamoDB, Microservices, CDK
01/2024 - 02/2024 | Consultant
- Implementation of a complete CI pipeline (including supporting systems such as build pools) from scratch via Infrastructure as Code on Azure
Keywords: Infrastructure as Code, Pulumi, Microsoft Azure, C#, .NET Core 8, TypeScript
04/2021 – 11/2023 | Senior, Staff and Principal Engineer
- Planning, leading and implementation of a large-scale migration project (400k+ lines of code) from Spring Boot 2.3 to 3.1
- Design and Proof of Concept implementations of refactoring approaches from a monolithic to a distributed service-oriented architecture
- Definition and introduction of company-wide standards and best practices (Architectural Decision Records, Code Reviews, Service templates and many more)
- Planning, design, coordination and implementation of business-critical product features
- Offering consulting to CTOs and Heads of Engineering about company-wide decisions and architectural designs
Keywords: Kotlin, Java, Go, Python, Terraform, SQL and NoSQL, Jenkins, CI/CD, AWS (EC2, ECS, RDS, Aurora, Lambda, DynamoDB etc.), Serverless, Microservices Distributed, fault-tolerant and scalable architecture, Large-scale refactoring
10/2020 - 03/2021 | Platform Engineer
- Design, implementation and maintenance of a country-wide used registry for drone operators
- Improving software development processes
- Extending and improving the underlying AirMap platform
- Code reviews
Keywords: Go, Python, Postgres, AWS, Kubernetes
02/2020 – 10/2020 | CTO & Software Architect
- Managed and provided technical and disciplinary oversight to a team of more than twenty employees
- Developed an API-first strategy encompassing software architecture, business processes, product strategy, and employee training
- Analyzed and improved a microservice-based distributed architecture
- Mentored and coached software developers, team leads, and product owners
- Facilitated SCRUM processes and conducted training for development teams
- Coordinated recruitment and selection of near- and off-shore freelancers and teams
Keywords: Go, Java, Python, TypeScript, MongoDB, Elastic Stack, Sematext, Kubernetes, OTC (Open Telecom Cloud), CQRS
11/2017 – 01/2020 | Software Architect, Senior Software Engineer, SCRUM Master
- Design and implementation of a worldwide identity and access management system
- Close collaboration with technical and business-related stakeholders
- Coaching of teams and individual engineers
- Performing the SCRUM master role for multiple months in addition to regular duties
Keywords: Java, Docker, Spring Boot, AWS Cloud, Elastic Stack, Neo4j, Cypher, Postgres, Camunda, Flowable, Apache Camel, React
02/2017 – 11/2017 | Software Architect, Senior Software Engineer
- Design a technical concept and software architecture for a KPI management tool
- Implementation of critical core system components
- Delivering expert functional and technical consulting services to the client
Keywords: Java, Spring Boot, Cassandra, CQL, Docker, Elastic Stack
03/2017 – 12/2018 | Software Architect and Data Scientist
- Conceptualization and proof-of-concept implementation of an analytics platform for enterprise-wide corporate data (‘Data Lake’)
- Delivering expert functional and technical consulting services to the client
Keywords: Java, Scala, Python, Docker
10/2016 – 11/2016 | Senior Software Engineer
- Development of a configurable tool for pseudonymizing personal data in a Big Data context
Keywords: Java, Spring Boot
08/2016 – 09/2016 | Senior Software Engineer
- Performance troubleshooting for a critical enterprise logistics application
- Implementation of identified technical and architectural enhancements
Keywords: Java, Spring Boot, SQL, JProfiler
07/2016 – 05/2017 | Software Architect and Data Scientist
- Development and conceptualization of an analytics platform for time series data
- Implementation and visualization of early fault detection (Predictive Maintenance) using machine learning techniques
Keywords: Scala, Spark with MLLib, Hadoop, Cloudera, R, Zeppelin
11/2015 – 04/2016 | Senior Software Engineer
- Conception and development of small applications based on SAP HCP
- Consulting with business units on technical and subject matter inquiries
Keywords: SAP Hana, Java
09/2015 – 04/2016 | Senior Software Engineer and Team Lead
- Design and implementation of new features for an application in the pharmaceutical sector
- Architecture planning for porting to SAP HCP
- Training of the existing development team
- Expansion and optimization of code quality measurements
Keywords: Java, JavaEE, WildFly, Wicket, Sonar, Jenkins
08/2015 – 06/2016 | Software Architect
- Development of the technical Big Data architecture for the application of a BMBF-funded research project
Keywords: Big Data, Architecture, Research
03/2015 – 09/2015 | Solution Architect and Development Lead
- Architectural advancement of a Hadoop-based reporting platform
- Development leadership (coaching, code reviews, quality control)
- Software development
Keywords: Java, Spring Boot, Hadoop, Cloudera, Impala, Sonar, Jenkins
03/2013 – 10/2014 | Co-Software Architect, Senior Software Engineer and Quality Assurance Manager
- Requirements engineering for a business customer-focused logistics application and creation of a comprehensive technical specification
- Development of a fail-safe and highly scalable architecture
- Implementation of central components
Keywords: Java, Groovy, SQL, Spring Boot, Genome (inhouse), Wicket, Hibernate, JIRA, Sonar, Jenkins
07/2012 – 02/2013 | Software Engineer
- Software development for generating sorting codes on package labels.
Keywords: Java, SQL, Spring Boot, Genome (inhouse), Oracle DB, JIRA
07/2012 – 04/2013 | Software Engineer
- Software development for route planning and dispatch in a mission-critical, highly available, and scalable application
- Implementation of an automatic deployment system
Keywords: Java, Groovy, SQL, Spring Boot, Wicket, Oracle DB, JIRA ``
2015 – 2019 | Lecturer for Web-Engineering (Freelance)
- Planning and conducting the master’s lecture “Web Engineering”
- Topics: Modern web architectures, frontend and backend development, deployment on cloud platforms, software tooling
- Content supervision of project groups
- Examination feedback and grading
04/2008 – 04/2012 | Fixed-term Position as a Research Associate
- Planning, execution, and analysis of research projects in functional programming languages and parallel programming
- Publication of research results
- Presentations at international conferences
- Lecturing on functional programming languages and foundational courses
- Supervision of student research assistants
- Guidance of student project and thesis work
08/2007 – 12/2007 | Fixed-term Position as a Research Associate
- Planning and execution of research projects
- Investigation and development of multimodal human-machine software architectures
- Conceptualization of situation-based and adaptive learning mechanisms
Certifications
- 11/2023 HashiCorp Certified: Terraform Associate (003)
- 03/2021 AWS Certified Cloud Practitioner
- 02/2019 – 04/2021 Training as a Systemic Coach (SG)
- Supporting and guiding individuals and teams in developing solutions and overcoming conflicts and obstacles through systemic interventions for personal and professional challenges
- Assisting with change processes for teams and organizations to enable smooth transitions and effective adaptation to new circumstances
- 10/2018 Certified Neo4J Professional
- 03/2017 SCRUM Professional Scrum Master (ITEMO)
- 03/2017 SCRUM Foundation und Professional Level (ITEMO)
- 01/2016 HA100 SAP HANA – Introduction
- 12/2014 MapR Certified Hadoop Admin (MCHA)
- 11/2014 MapR Certified Hadoop Professional: Developer (MCHP:D)
- 02/2013 Certified Professional for Requirements Engineering Foundation Level (FL)
Education
04/2008 - 04/20212 | Ph.D. in Computer Science
- Title: “On the Benefits of Abstraction in Concurrent Haskell”
- Focused on advancing the field of functional programming and concurrency models.
10/2001 - 06/2007 | Diploma in Computer Science with a minor in Mathematics
Technical University of Clausthal
- Comparable to a Master’s degree.
- Comprehensive curriculum covering both theoretical and applied aspects of computer science and mathematics.