Christian Wahnsiedler
Berlin, Germany | Open to relocation

Christian Wahnsiedler

Building scalable, AI-powered, regulatory-compliant cloud platforms that deliver massive business impact.

Open to freelance consulting (Germany, Switzerland, US) and full-time senior roles worldwide.

About Me

Senior Cloud & AI Engineer with 7+ years of hands-on experience designing and delivering mission-critical platforms for banking, automotive, fintech, and mobility sectors.

Specialized in hybrid cloud architectures, AI document intelligence, regulatory reporting solutions, Kubernetes, Terraform, and Java/Spring Boot backends.

I help companies automate complex processes, achieve regulatory compliance at scale, and significantly reduce manual effort using cutting-edge AI and cloud technologies.

Open to freelance consulting and contracting (preferred in Germany & Switzerland, also US/remote) as well as permanent full-time senior roles with relocation willingness.

What I Offer

I design, architect, and implement modern cloud-native and AI-powered solutions across all major hyperscalers — AWS, Google Cloud Platform, and Azure. I specialize in integrating the latest AI models and building sophisticated agentic workflows. In addition, I deliver full-stack cloud development with a strong focus on Java/Spring Boot applications, Infrastructure as Code with Terraform, Kubernetes orchestration, hybrid cloud architectures, and enterprise-grade security and regulatory compliance.

AI Service Implementation

End-to-end design, development, and deployment of AI-powered solutions using models and services from AWS, Google Cloud, and Azure. This includes not only direct API integration but the complete surrounding architecture — building scalable microservices, hybrid cloud pipelines, on-prem connectors, data processing flows, orchestration layers, security, and compliance controls so that AI capabilities can be reliably called from both cloud-native and on-premises systems.

Hybrid Cloud Architecture

End-to-end design and implementation of hybrid cloud architectures that seamlessly bridge on-premises infrastructure with public cloud platforms including AWS, Google Cloud Platform, and Microsoft Azure. I architect event-driven systems using Pub/Sub, Kafka, and Service Bus for reliable message orchestration, deploy serverless compute with Cloud Functions and Lambda, and integrate analytics layers with BigQuery, Redshift, or Synapse. Every solution is designed for high availability, disaster recovery, and secure data flow between environments — enabling enterprises to modernize incrementally while preserving existing investments.

Regulatory Reporting Solutions

Design and delivery of high-performance, regulatory-compliant reporting platforms for financial institutions operating under SRB, ECB, and other European banking regulations. I build scalable batch processing systems using Spring Batch and enterprise databases like DB2 and Oracle, capable of transforming and validating entire bank balance sheets within sub-24-hour windows. Solutions include comprehensive audit trails, data lineage tracking, validation frameworks, and automated quality controls — ensuring accurate, timely submissions that meet the stringent requirements of resolution planning and supervisory reporting.

Kubernetes & Infrastructure as Code

Production-grade Kubernetes deployments across all major managed services — AKS, EKS, and GKE — along with complete infrastructure automation using Terraform. I design cluster architectures with proper networking, ingress controllers, service meshes, and autoscaling policies, then codify every resource for repeatable, version-controlled deployments. This includes CI/CD pipeline integration, GitOps workflows, Helm chart management, secrets handling, and comprehensive monitoring with Prometheus and Grafana — giving your teams the ability to deploy, scale, and operate containerized workloads with confidence and minimal operational overhead.

Java / Spring Boot Development

Enterprise-grade Java application development using Spring Boot, Spring Batch, and the broader Spring ecosystem across Java 8 through 21. I build robust backend services with RESTful APIs, complex data transformation pipelines, and high-performance SQL integrations against relational databases including PostgreSQL, MySQL, and DB2. Every project includes comprehensive testing strategies with JUnit and Mockito, clean architecture principles, proper logging and observability hooks, and thorough documentation — delivering maintainable, performant systems that integrate seamlessly with your existing enterprise landscape.

Security & Compliance

Comprehensive cloud security architecture and implementation across AWS, GCP, and Azure, following zero-trust principles and least-privilege access models. I design and deploy CMEK encryption, Private Google Access, Workload Identity Federation, RBAC policies, Azure Managed Identities, and secrets management via KeyVault, Secrets Manager, or HashiCorp Vault. Every solution is built with regulatory compliance in mind — whether GDPR, SOC 2, or industry-specific mandates — ensuring your data and workloads are protected end-to-end while maintaining full auditability and traceability for compliance reporting.

Professional Experience

Jan 2026 - Present

Senior IT Consultant

Deloitte GmbH
  • • Architected and led the end-to-end development of a highly scalable, robust, and regulatory-compliant AI-powered document processing platform using Google Document AI, the Gemini model family, and custom-trained models via Vertex AI Model Garden. The solution processes and classifies documents across over 2,000 document types with high accuracy.
  • • Designed and implemented a multi-stage AI pipeline (classification → extraction → validation) leveraging Google Document AI custom classifiers, extractors, and Gemini models for intelligent document understanding and decision support.
  • • Architected the full hybrid cloud architecture (On-Prem Java services + GCP processing pipeline), including Pub/Sub-driven orchestration, Cloud Functions for processing steps, and BigQuery for audit & traceability — fully provisioned and managed as Infrastructure as Code using Terraform.
  • • Built and integrated reusable, modular AI components (generic classifiers, extractors, and on-prem connectors) that enable rapid onboarding of new use cases while maintaining strict data privacy, security, and compliance standards.
  • • Developed On-Prem Java services and Python-based Cloud Functions responsible for document ingestion, manifest generation, intelligent routing, and result finalization, ensuring seamless bidirectional integration with the client's existing systems (Kafka, Microsoft Exchange, internal databases).
  • • Optimized the platform to handle ~666,000 emails per year for the client's Sales Service Center, significantly improving processing speed, data quality, and automation rate while reducing manual effort.
  • • Implemented comprehensive security and compliance measures (CMEK encryption, Private Google Access, Least Privilege IAM via Terraform, Workload Identity Federation) across the entire hybrid landscape.
May 2025 - Dec 2025

Senior IT Consultant

Deloitte GmbH
  • • Designed and implemented a high-performance, regulatory-compliant resolution and bail-in data reporting solution for a major European banking group in alignment with Single Resolution Board (SRB) and ECB requirements.
  • • Led the technical architecture and development of a scalable Spring Boot Java application using Spring Batch to process and transform massive volumes of balance sheet, asset, and liability data from DB2 databases into SRB-compliant reporting formats.
  • • Achieved sub-24-hour end-to-end processing of the bank's entire balance sheet (assets & liabilities), enabling timely delivery of critical resolution data to the Single Resolution Board.
  • • Took ownership of key architectural decisions, complex data transformation logic, high-performance SQL query design, and the implementation of comprehensive validation & testing frameworks to guarantee data accuracy and regulatory compliance.
  • • Collaborated closely with stakeholders, solution architects, and testing teams to ensure full alignment with enterprise architecture standards, data quality requirements, and successful end-to-end delivery.
  • • Delivered a robust, maintainable, and highly performant batch processing platform capable of handling the stringent timelines and data volumes mandated by European banking resolution regulations.
Feb 2022 - Feb 2025

IT Consultant

Volkswagen AG, Cariad project (for Comsysto Reply)
  • • Architected, developed, and deployed scalable applications to Azure Cloud using Terraform, AKS, Azure VMSS, and various Azure services (e.g., CosmosDB, Functions, Application Gateway, Service Bus Queue).
  • • Ensured robust security by implementing RBAC, Azure Managed Identities, and managing secrets via Azure KeyVault and DevOps Variable Groups.
  • • Established monitoring systems leveraging Azure Log Analytics, Application Insights, and Alert Rules to track health and incident response.
  • • Engineered and optimized Kubernetes deployments, services, and networking configurations.
  • • Refactored infrastructure-as-code using Terraform to enhance scalability and maintainability.
  • • Spearheaded DevOps practices with Azure DevOps repositories and pipelines for CI/CD workflows.
  • • Designed and implemented new features in Java 17/21 Spring applications and migrated dependencies to newer versions.
  • • Facilitated SCRUM activities, including sprint planning, refinements, and reviews, while mentoring team members.
  • • Authored comprehensive documentation and architecture decision records.
  • • Contributed to talent acquisition through recruiting, interviewing, and onboarding processes.
Jan 2021 - Sept 2021

Software Engineer

Hypoport SE
  • • Automated creditworthiness assessments by developing rule sets in Java 11 and Spring Boot.
  • • Designed and optimized complex SQL queries to enrich assessment data and improve application performance.
  • • Expanded core application test suites using JUnit 4 and Mockito for reliable and robust software.
  • • Provisioned and managed AWS Cloud infrastructure, including Amazon RDS, S3, ECR, EC2, and Elastic Load Balancer, using Terraform.
  • • Leveraged GitHub for version control and collaboration.
Jan 2020 - Apr 2020

Data Scientist & Engineer (Working Student)

Uber Germany GmbH
  • • Engineered data pipelines to support performance analysis and compliance using Python, Pandas, Numpy, and Scikit-Learn.
  • • Extracted, cleaned, and transformed large datasets using SQL and automated processes via Google APIs.
  • • Delivered actionable insights to stakeholders through automated data workflows and reports.
Jun 2019 - Oct 2019

Software Engineer (Internship)

Finanz Informatik Solutions Plus
  • • Enhanced code quality and security by integrating SonarQube for automated analysis.
  • • Automated core application documentation using Asciidoctor, streamlining processes and reducing manual effort.
  • • Migrated legacy systems from Java 8 to Java 11, ensuring compatibility and performance improvements.
  • • Developed and optimized data retrieval processes using SQL for improved data analytics.
  • • Collaborated using GitHub for efficient version control and team synchronization.

Tech Stack

Java SE & EE (8, 11, 17, 21)

Spring Boot Spring Batch Maven JUnit 4 Mockito Tomcat JBoss AsciidoctorJ

Python 3

Pandas NumPy Scikit-learn TensorFlow Flask Requests Selenium BeautifulSoup4

Cloud Platforms

Google Cloud Platform (GCP) Microsoft Azure Amazon Web Services (AWS)

Containerization & Infrastructure as Code

Kubernetes Terraform Docker

DevOps & CI/CD

Azure DevOps Jenkins AWS CodePipeline GCP Cloud Build GitHub Actions

Data Services & Databases

MariaDB MySQL PostgreSQL Amazon RDS CosmosDB MongoDB BigQuery DB2

Monitoring & Observability

Prometheus Grafana Azure Log Analytics Application Insights

Tools & Methodologies

Git GitHub GitLab Jira Confluence SCRUM PowerShell Bash

Operating Systems

Linux (Ubuntu) Windows macOS

Rates & Availability

Daily Rate (Freelance/Consulting)
€1,200
Short-term projects
Long-term contracts
Full-time employment
Preferred Locations
Germany, Switzerland, Remote
US clients welcome - German fluency is a strong plus
Relocation
Yes, for the right full-time opportunity
Languages
German (Native) English (Fluent)

Education

2021

B.Sc. Business Computing

University of Applied Sciences Berlin
Grade: 1.65 (Ø)
2015

Abitur

Georg-Herwegh-Gymnasium
Grade: 1.5 (Ø)

Certifications

Certified Kubernetes Application Developer

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Microsoft Certified: Azure Fundamentals (AZ-900)

R6446F-0E5A5C

AWS Certified Solutions Architect - Associate

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AWS Certified Cloud Practitioner

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Let's Work Together

Ready to build your next cloud platform or AI solution?

I'm available for freelance consulting, contract work, and full-time positions.

Daily Rate: €1,200
christian.wahnsiedler@gmail.com
+49 (0) 173 412 5665
Markgrafendamm 33, 10245 Berlin, Germany