Senior Consultant und Interim Executive

11/2021 – 10/2022

• Led the migration of an organically grown AWS environment to a highly
available, production-grade cloud architecture, significantly improving reliability, scalability, and operational resilience.

• Took full ownership of stabilizing and modernizing AWS infrastructure in a high-growth startup (>40M€ funding) amid frequent team changes and limited prior infrastructure stewardship.

• Architected and operated high-availability data layers using multiple AWS RDS MySQL 8.0 clusters and AWS ElastiCache Redis clusters, improving performance and data consistency.

• Designed and implemented blue-green deployment pipelines using GitHub Actions, enabling zero-downtime releases and safer production rollouts.

• Built and supported local development environments and CI/CD pipelines, accelerating developer productivity and reducing deployment friction.

• Played a key role in the company’s ISO 27001 and SOC 2 certification initiatives, contributing to security controls, asset monitoring, and audit readiness.

• Implemented continuous asset and compliance monitoring using Vanta,
improving visibility into infrastructure security posture.

• Delivered a scalable container platform using AWS ECS with EC2 and Fargate, balancing cost efficiency, scalability, and operational simplicity.

• Improved application availability and traffic management through AWS Load Balancers, ensuring consistent performance under load.

• Strengthened data protection and security controls using AWS KMS, aligning infrastructure with enterprise security and compliance requirements.

• Earned four consecutive contract renewals, reflecting strong delivery impact and stakeholder trust.

Amazon Web Services (AWS), Docker

10/2020 – 9/2021

• Led a full-scale migration from DigitalOcean to AWS, significantly improving scalability, reliability, and long-term robustness of the cloud infrastructure.

• Modernized the application platform by replacing an outdated Rancher setup, stabilizing and streamlining web, frontend, and backend service operations.

• Designed and implemented golden AMIs, enabling ultra-fast, repeatable deployments and supporting highly agile release cycles.

• Migrated multi-terabyte object storage from DigitalOcean’s S3-compatible storage to AWS S3, improving durability, performance, and operational maturity.

• Established secure remote access via VPN, enabling safe and controlled infrastructure access for distributed engineering teams.

• Introduced advanced monitoring and alerting using AWS CloudWatch and New Relic, enabling proactive detection and faster incident response.

• Designed and implemented blue-green deployment strategies, minimizing downtime and reducing risk during production releases.

• Built CI/CD pipelines to support efficient development workflows, including automated pipelines for iOS and Android application builds.

• Implemented comprehensive backup and recovery strategies, improving data protection and operational resilience.

• Ensured a smooth operational handover to a dedicated Site Reliability Engineer, maintaining continuity and long-term platform stability.

• Achieved four consecutive contract renewals, reflecting strong delivery impact and sustained stakeholder confidence.

Amazon Web Services (AWS), Docker, Systemmigration

4/2019 – 5/2020

• Led the complete migration of a mission-critical back-office fulfillment
system from on-premise to AWS, establishing a modern, scalable, and highly available cloud platform.

• Designed and implemented a comprehensive AWS security and network architecture, ensuring secure connectivity, isolation, and compliance for production workloads.

• Migrated multi-tens of terabytes of MySQL data to AWS, executing a reliable, low-risk data transfer for business-critical systems.

• Ported multi-tens of terabytes of NFS data to AWS EFS, enabling scalable,
highly available shared storage in the cloud.

• Automated provisioning and configuration of all servers using Terraform and Ansible, eliminating manual setup and improving infrastructure consistency.

• Introduced CI/CD pipelines with Auto Scaling Groups, Load Balancers,
and blue-green deployments, enabling zero-downtime releases and improved release safety.

• Implemented centralized log management, significantly improving system observability and operational troubleshooting.

• Designed and documented backup, maintenance, monitoring, and operations concepts, strengthening long-term reliability and operational readiness.

• Trained development teams on DevOps practices, AWS, and Terraform,
increasing internal cloud maturity and reducing operational dependencies.

• Achieved four consecutive contract renewals, reflecting sustained delivery quality and strong stakeholder trust.

Amazon Web Services (AWS), Docker

8/2017 – 3/2019

• Led the migration of legacy monolithic applications to AWS, using Terraform, Packer, Ansible, Consul, and Vault to establish a secure, automated, and reproducible infrastructure.

• Migrated CI/CD workflows from Jenkins to CircleCI, significantly improving pipeline reliability, execution speed, and maintainability.

• Orchestrated the company-wide migration from GitLab to GitHub, standardizing version control and improving collaboration and code review workflows.

• Migrated all production databases to AWS-managed services, increasing availability, scalability, and operational stability.

• Introduced ProxySQL for database load balancing and traffic management, improving
performance and resilience of database workloads.

• Automated provisioning, rolling deployments, and in-place upgrades of all servers using Ansible, enabling zero-downtime updates.

• Established engineering and development standards across teams, improving code quality, consistency, and long-term maintainability.

• Introduced modern development tooling and workflows, raising overall engineering productivity and delivery quality.

• Designed and rolled out a company-wide testing strategy, significantly improving test coverage, release confidence, and defect detection.

• Conducted technical workshops and training sessions on agile testing, clean code practices, and managing technical debt, strengthening engineering culture and sustainability.

Amazon Web Services (AWS), Systemmigration

3/2012 – 7/2017

• Introduced and scaled Scrum and Kanban practices across 6 development teams, enabling predictable delivery, transparency, and continuous improvement.

• Set up, coached, and managed 15 developers in agile ways of working, significantly improving collaboration, ownership, and delivery velocity.

• Designed and implemented CI/CD pipelines and automated test frameworks, increasing release frequency while reducing regression risk.

• Led the migration from PHP 5.0 to PHP 7, improving application performance, security, and long-term maintainability.

• Migrated caching infrastructure from Memcache to Redis, enhancing reliability, performance, and operational flexibility.

• Executed a full codebase and database character set migration from Latin1 to UTF-8, ensuring correct internationalization and data consistency.

• Introduced and standardized Atlassian Jira, Confluence, and Bamboo, improving project tracking, documentation, and CI/CD integration.

• Established Continuous Integration and unit testing practices from the
ground up, raising code quality and reducing production defects.

• Led the architectural transition from a monolith to a microservices-based
system, enabling independent deployments and improved scalability.

• Held overall responsibility for 15 developers, aligning technical execution with business and delivery goals.

Kanban, Scrum, Teamleiter IT

3/2011 – 2/2012

• Supervised and coordinated 10+ developers while scaling platform systems to support 9.3 million registered users.

• Led the scaling and optimization of core systems, ensuring stability and
performance under rapidly growing user demand.

• Drove the development of new features for both end users and internal
employees, aligning technical delivery with business needs.

• Designed and implemented an in-house advertising server handling 5+ billion
ad impressions per month, delivering high throughput and reliability at massive
scale.

• Produced regular technical and performance reports for executive management,
supporting data-driven decision-making.

• Continued the development and optimization of the in-house
PHP framework, improving maintainability, performance, and developer
productivity.

Apache, C++, Mysql, PHP

2/2008 – 2/2011

• Contributed to the build and operation of one of Germany’s largest social
networking platforms, supporting a highly scalable, high-traffic production environment.

• Operated and scaled the platform to reliably handle up to 250,000 concurrent users.

• Enabled the processing of 5+ billion page views per month, ensuring performance and stability at massive scale.

• Drove the development and enhancement of core user-facing features,
improving engagement and user experience.

• Optimized the platform scaling architecture and overall system stability,
reducing performance bottlenecks under peak load.

• Expanded and improved monitoring and observability systems, enabling
proactive detection and faster resolution of incidents.

• Introduced Scrum and Kanban methodologies, professionalizing software development processes and improving delivery predictability and team efficiency.

Mysql, Apache, C++, PHP

2/2004 – 1/2008

• Contributed to a wide range of client projects in a fast-paced agency environment, delivering tailored web solutions for diverse industries.

• Designed, implemented, and maintained small to mid-sized websites for multiple customers with varying requirements.

• Developed and customized multilingual websites, supporting international audiences and localization needs.

• Built and adapted small e-commerce and shop systems for global target
markets.

• Worked in direct collaboration with clients, translating business requirements into technical solutions.

• Delivered results across rapidly changing projects with short implementation cycles, demonstrating flexibility and reliability.

• Established a strong foundation in clean web development, best practices, and customer-centric delivery.

Web Entwicklung