DevOps Experts in Hamburg

• End-to-end analysis and optimization of existing processes in campaign management, contract management and district heating construction/construction coordination
• Development of automated contract management and transformation scenarios, including software selection and integration
• Analysis of ERP, chat, RCS messaging, consent management and tracking
• Preparation of recommendations, decision proposals and presentations for the executive board
• Use of AI for process optimization
• Tools: Apple Office, Microsoft 365, Teams, Claude, ChatGPT

Cloud Journey Kickoff on STACKIT

• Helped the client kickstart their cloud journey on sovereign EU STACKIT platform.
• Bootstrapped IAC & GitOps architecture with Opentofu and ArgoCD.
• Setup platform fundamentals for a fresh, holistic cloud experience: Kubernetes, external secrets, certificate management, gateway API, DNS & routing, observability basics.

Due to founding another company during COVID, the managing director stepped back from day-to-day operations, which left the team without leadership for around 3 years.

My task was to train a new Product Owner, shape the developers and the Product Owner into a cohesive team, and coach this newly formed team into a state where self-organized value delivery for the customer would be possible again.

Because of the political situation in the US, the main customer of my client saw a drop in revenue, which made a change in the business model necessary for my client. I was allowed to support the transition from a service provider to an AI-first company with a broad customer base in a strategic advisory role, hire staff, and facilitate several C-level negotiations between my client and its new customers.

TASKS

• Training team and management in Scrum and agile ways of working
• Coaching a junior Product Owner up to PSPO II level
• Mediating conflicts in change processes
• C-level consulting and negotiation facilitation
• Developing and evaluating business models
• Leading the hiring process for 4 new employees

ACHIEVEMENTS

• Successfully coached Product Owner to PSPO II level
• Formed a cohesive Scrum team from a team without leadership
• Restored self-organized value delivery for the customer
• Successfully transitioned to AI-native development (Claude)
• Successfully changed the customer's business model

TOOLS & METHODS

• Team building
• NVC according to Rosenberg
• Conflict management
• Workshop facilitation
• Negotiation facilitation
• Leadership coaching
• Personio hiring

Full overall responsibility: product, technology, compliance and go-to-market

• Delivered an enterprise MVP in 54 days, exceeding scope and schedule.
• Won a 250k € ARR anchor customer and built a sustainable enterprise sales pipeline in the first quarter.
• Paid PoCs with Zalando (35k €) and tesa (26k €), validating product-market fit with Tier-1 enterprise customers.
• Initiated ISO-27001 and TISAX certification processes. Left when the venture entered its next organizational phase.

• Onboarded and conducted comprehensive documentation and system analysis to assess the existing data infrastructure, facilitating rapid integration and collaboration across functional data teams (modelling, processing, reporting).
• Collaboratively defined the architecture and project structure for a central data pipeline repository, including hierarchical standards, knowledge management strategies, and role-specific responsibilities, enhancing maintainability and onboarding speed.
• Evaluated and validated open-source data routing tools (Airbyte, Apache NiFi, Dragster) for ingest and sync requirements in retail analytics, including local benchmarking and error-state testing.
• Led the design and deployment of Airbyte in Kubernetes, creating customized Helm charts, securing secrets handling, and configuring Ingress with TLS and internal DNS routing, ensuring full API and UI accessibility.
• Troubleshot and resolved Ingress controller issues, iterating through multiple stages of debugging and testing, and documented setup and replication steps for scalable reuse.
• Mapped data models to ARTS standard, supporting schema alignment for ERP and reporting use cases, and coordinated review loops to align future data processing logic.
• Drafted strategic 1-pagers comparing MinIO, Pub/Sub, and routing architectures, providing technical guidance for architectural decisions and investment planning.
• Enabled secure access and authentication mechanisms, including initial evaluation for SAML integration, cluster-level configuration reviews, and service annotation improvements.

Energy, transmission system operator · Desktop, web application

• Products Digitalisation of the grid connection process; master data and processes of market locations; balancing of virtual MaBiS aggregate time series; the group's first searchable catalogue and visual UI pattern library

• Planning, running and analysing qualitative in-depth interviews: more than 100 interviews with external market partners and internal departments

• Designing qualitative interviews including interview guides and evaluation logics; recruiting and scheduling participants

• Analysing, preparing and presenting research findings as usability reports and result reports

• Translating research findings into UX and design requirements and deriving prioritised recommendations for improvement

• Presenting analysis and research results to departments, product owners and decision makers in a form suited to each audience

• UX research for internal enterprise and line-of-business applications along regulated market processes

• Quantitative methods: online surveys for roadmap prioritisation, questionnaire studies, definition and measurement of UX KPIs

• Facilitating requirements workshops; gathering, analysing, describing, agreeing and documenting functional and non-functional requirements

• Developing user flows and customer journeys; building and providing UX standards, methods and capabilities (UI pattern library)

• Working in product and project teams under Scrum, taking part in all subject-matter meetings and Scrum events

Impact Took three software products to launch

Tools Condens, Miro, FigJam, Figma, Whimsical, Microsoft Teams, Typeform

traigo is VTG's digital rail logistics and fleet management platform. It processes large volumes of telemetry, mileage, geofence, sensor and wagon-movement events in near real time and provides operational services for rail logistics customers across Europe.

As part of Team Customer Selfcare, I worked on the design, implementation, optimisation and operation of large-scale backend services and event-driven processing pipelines — covering both feature development and operational ownership of business-critical production systems. I also regularly acted as first responder for production incidents, data inconsistencies and performance investigations across multiple distributed services.

• Design and implementation of event-driven backend services.
• Migration and replacement of legacy processing pipelines.
• Development of replay / rebuild mechanisms for large event datasets.
• High-throughput asynchronous event processing on SNS / SQS.
• Database and query optimisation for PostgreSQL and DynamoDB.
• Design of scalable read / write models and aggregation pipelines.
• Production troubleshooting and operational support.
• Performance tuning and infrastructure scaling.
• Design and stabilisation of integration and system tests.
• Technical concepts, architecture documentation, and cross-team collaboration.
• Support the further development of existing GitLab CI/CD pipelines

Geofence & Wagon Stay Processing

• Algorithm to detect vehicles within geofences (entry, exit, dwell time).
• Event sourcing with guaranteed chronological order within the affected time window.
• Refactored geofence event and wagon-stay processing logic for performance.
• Resolved race conditions and event-ordering problems in distributed services; server-side filtering, aggregation and optimised query pipelines.
• Repair and replay tooling for corrupted or inconsistent movement data.

Fleet Metadata & Mileage

• Modernised the service; migrated storage from DynamoDB to PostgreSQL to improve traceability and accelerate new features.
• Scalable mileage aggregation and replay mechanisms.
• Read / write models and optimised queries for high-volume mileage calculations.

Sensor & Telematics Integration

• Integrated telemetry and sensor processing pipelines.
• Snapshot and state-calculation logic for sensor systems.
• APIs and persistence models for wagon sensor data; data-quality improvements.
• Further development of a service using gRPC for intra-service communication.

Movement Segment Processing & Routing

• Migrated services to new movement-segment event streams.
• Built replay and rebuild tooling for segment correction.
• Optimised throughput and reliability for high-volume event processing.

Condition Monitoring & Wagon Analytics

• APIs and backend services for wagon condition monitoring.
• Brake-wear prediction processing and wagon analytics functionality.
• PostgreSQL views and optimised query models for operational dashboards.

Operational Reliability - First Responder

• Investigated production incidents and distributed-system failures; DLQ analysis, replay and operational recovery.
• Tuned database performance and AWS infrastructure under production load.
• Improved observability, monitoring and operational tooling.
• Supported rollout strategies, monitoring and post-deployment stabilisation.

Project:

• Migration of existing VB6 applications to C# (Web API, web app)
• Report development and risk management systems (C#, API interfaces, databases)
• Document archive (API interfaces, databases)

Team size: 9 people

• Reports for Risk and Credit Management Development and maintenance of report structures to support risk and credit decisions, including data modeling, validation, and automated delivery for business departments.
• Migration and maintenance of a legacy system to the latest version of .NET for the asset management system Planning and execution of the modernization of an existing asset management system, including code refactoring, performance optimization, test automation, and sustainable maintenance after migration.
• Replacement of the COM-based archive connection with a REST API Redevelopment of the connection of the document archive (HYPARCHIV) to a REST API based on OpenAPI/Swagger, including archiving with index and stamp fields as well as PDF export into the customer portal.
• Redesign of payment receipt processing Replacement of an existing Oracle PL/SQL process with a new implementation in C# based on a business concept, including business alignment, data modeling, and test coverage.
• Design and implementation of tests, creation of deployment pipelines, and documentation
• Further development and implementation of change requests.
• Regular code reviews within the team as well as optimization of application scalability and stability

Technologies: C#, .NET 10, ASP.NET, Unit of Work, IoC, Three-Tier Architecture, Entity Framework Core, DB First, Web API, Swagger, OpenAPI, Python, Oracle, HYPARCHIV, Azure, PowerBI, DevOps, AKS (Azure Kubernetes Service), GIT, xUnit, NSubstitute, TypeScript, Vue.js, Pinia,

Methods: agile development using Scrum

• Overall responsibility for IT, including the creation and implementation of the IT roadmap/IT strategy and the resulting measures in the organizational structure, processes and systems landscape

• Member of the Management Board

• Organizational development

• Development of the corporate strategy

• Introduction of a new SteerCo process for Germany in coordination with the Dutch group

• Restructuring and optimization of incident, problem and change management

• Moderation and execution of software and partner selection processes for the introduction of new systems/applications

• Initiation and negotiation of business relationships with external service providers and suppliers, including contract design

• Ensuring IT security and data protection in accordance with legal requirements and best practices

• Expansion of internal data centers and infrastructure to ensure SLAs for internal operations, including cloud services and cybersecurity

• Budget planning and control as well as resource management for the area of responsibility

• Environment: AWS, Ruby on Rails, GraphQL, React Native
• Penetration test for Backend, Android-App and iOS-App

• Several projects in a police context
• Model and document police procedures/projects with Archimate (as-is/to-be) in the context of P20 (BKA)
• Create software architectures with microservices
• POC development with Springboot/Docker/Kubernetes
• Project size: 10 people
• Enterprise architecture management with Togaf and Archimate
• Backend software development Springboot
• DevOps with Kubernetes
• Implemented using: Java 17/21, Springboot 3, P20 architecture, Togaf, Archimate

• Planning, management and monitoring of the Corporate Responsibility Tech Enablement project for IT
• Design and implementation of the EUDR (EU Deforestation Regulation)
• Design and implementation of the Eco-Design Regulation
• Continuation of projects as part of the Corporate Responsibility strategy
• Definition and review of requirements (e.g. governance, success metrics) and, where necessary, analysis and resolution of problems
• Overall management, marketing, communication and quality assurance of the projects
• Creation of the project plan including timeline/roadmap, budget and resources
• Ensuring compliance with budget and deadlines
• Defining project management guidelines, methods and priorities
• Planning and tracking resources & efforts, also in cooperation with other IT departments
• Evaluation of projects and preparation of results (reporting to management)
• Identification and reduction of risks
• Regular communication with stakeholders
• Management of internal and external stakeholders and service providers (Jira, Confluence, backlog management, task tracking, Sharepoint, MS 365 Platform etc.)
• Development of standards and automation of processes
• Technical design and documentation of the Digital Product Passport
• Selection and evaluation of potential software providers
• Training and workshops on Osapiens

Label: Azure Cloud, Jira, Confluence, Power BI, SAP BW, AWS, Miro, Bee360, Draw.io, Sharepoint, MS 365 Platform, Trello, Osapiens, Naravero etc.

• Independent Software Engineer focusing mainly on complex backend architectures.