Google App Engine Experts in Germany

I designed and developed an AI-powered multi-tenant platform on Azure that transforms SAP process recordings into technical documentation, presentations and automated tests, processing over 15,000 process recordings for enterprise customers like Würth. I owned the architecture, the production releases and the DevOps setup. I also designed a multi-tenant system with SSO and role-based access on Azure. Implemented an MCP Server with Dynamic OAuth Authentication.

Main Tasks:

• Sprint planning and feature preparation
• Design the multi-tenant platform architecture (FastAPI, SQLAlchemy, PostgreSQL row-level security for tenant isolation)
• Develop AI pipelines with Prefect for transcription (Azure Speech API), document generation and SAP screen-recording analysis (Claude, gpt-4-mini)
• Design and implement an MCP server to expose tenant knowledge to LLM clients (Claude), with async retrieval and reranking
• Implement LLM cost tracking, rate limiting and client pooling for Anthropic/OpenAI/Azure OpenAI endpoints
• Set up CI/CD: Docker images to Azure Container Registry, GitHub Actions, Azure Static Web Apps, Alembic migrations in containers
• Manage production releases and execute live data migrations for enterprise customers
• Define engineering standards and architecture patterns for the team

Environment: Azure / Azure Foundry / Python / FastAPI / Prefect / React / PostgreSQL

In a lean, execution-focused environment, I took ownership beyond a narrow engineering lane, shaping and implementing systems across backend, data, and infrastructure. Partnered directly with the three founders in a fast-moving, high-stakes environment, turning strategic priorities into concrete technical decisions and production outcomes.

• Owned core platform development across backend (Django/Rest Framework/Postgres), ETL (Python/Dagster), infrastructure (Terraform/Kubernetes/AWS), and frontend (typescript/react) for a climate-tech SaaS product, driving continuous cross-stack development across five repositories from October 2021 to this day.
• Architected and owned a standalone internal Python scoring framework for CRC assessments, using YAML-driven rules and metaprogramming to enable non-technical users to define complex evaluation logic without hardcoded implementations.
• Built and stabilized ETL and scraping pipelines using Dagster and Scrapfly, improving document ingestion, tagging, retry behavior, deployment flow, and operational resilience.
• Contributed to platform modernization and reliability through Django/Python upgrades, Postgres/RDS and EKS changes, CDN/TLS updates, test and performance improvements, and observability hardening.
• Drove backend engineering for product features, translating requirements into technical specifications, API contracts, data structures, and scalable implementation plans.

• Cloud Computing Fundamentals & Architecture: Expertise in core cloud concepts, including the three main Service Models (IaaS, PaaS, SaaS) and diverse Deployment Models (Public, Private, Hybrid, Multi-cloud).
• Modern Application Deployment Strategies (GCP Focus): Instruction on the GCP Application Hosting Spectrum, covering Virtual Machines, Containers (Kubernetes and Cloud Run), Platform as a Service (App Engine), and Serverless Computing (Functions as a Service - FaaS).
• Data Management & Big Data Analytics: Comprehensive coverage of Cloud Storage options (Object, Block, File) and Database solutions, including Relational (Cloud SQL), NoSQL (Firestore, BigTable, Memorystore), and serverless enterprise data warehousing (BigQuery).
• DevOps and Infrastructure Automation: Skills in DevOps principles, including Continuous Integration (CI), Continuous Delivery (CD), Infrastructure as Code (IaC) using tools like Terraform, and implementing effective Monitoring and Logging for system observability.
• Emerging Technologies & Responsible Cloud Use: Focus on crucial topics like Cloud and IoT Security, Identity and Access Management (IAM), data privacy, and the ethical considerations of cloud and massive data collection.

• Creation, maintenance and hardening of Kubernetes clusters employing Ansible and ArgoCD
• Keywords: Ansible, AWX, Kubernetes, NetApp, Prometheus, CI/CD ArgoCD, SSO, Fluent-bit, HAProxy, Calico, Keycloak, oauth2-proxy, SealedSecrets, kubeseal, Aqua kube-bench, CIS-Benchmarks, Aqua Trivy operator

• Built and managed a high-performing native app team (Android & iOS) from scratch
• Modernized the finance application with new features, leveraging Kotlin, Java, and Spring Boot microservices
• Introduced and scaled backend services enabling secure, high-traffic financial transactions for millions of users
• Improved development efficiency with custom tools for crash reporting, CI/CD pipelines, and release management
• Led recruitment, coaching, and mentoring of developers, fostering professional growth and cross-functional collaboration

• Design and provide best practices on data modeling for dbt, including changing dimensions, late arriving data handling, and testing
• Design the ingestion flow from other systems into S3 and Redshift
• Design and implement new partitions for Dagster and incremental loading with dbt
• Map business requirements to technical architectures
• Instruct junior team members

• Self-employed work as a software developer

• Hybrid role as the first software engineer in the company to bootstrap the organization, laying out technical foundation and advising management on organizational aspects.
• Set up the SaaS platform architecture, selected languages and tools, and designed processes to deliver customer value quickly and reliably.
• Designed and implemented build and continuous deployment pipeline with multi-tenant approach enabling extreme scaling of the SaaS platform.
• Established initial ITSM and support processes, provided monitoring and alarming, and participated in the on-call team.
• Proposed new approaches to scale the platform and improve backend interfaces to mitigate bugs and communication overhead.
• Mentored new employees and served as a trustful team member and lateral leader.
• Conducted interviews for technical roles.
• Used technologies: Typescript, Node.js, Bash, Google Cloud Platform (App Engine, Cloud Run, Cloud Functions, Google Endpoints, Firebase), GitHub Actions, Docker, Terraform, MongoDB, Firebase, REST APIs, GraphQL.

• Led development activities for enterprise applications, managing design, planning, and delivery to meet organizational goals.
• Constructed and deployed microservices using Java/JavaEE, Kotlin, Spring Boot, Kafka incorporating synchronous and asynchronous communication, achieving a 95% on-time delivery rate.
• Developed microservices in Golang utilizing frameworks such as Gin, GORM, and Viper for high-performance applications.
• Maintained RESTful and GraphQL APIs, enabling seamless integration with enterprise applications.
• Leveraged gRPC for secure, efficient service-to-service communication in microservices, reducing latency.
• Used SQL databases (MySQL, PostgreSQL) and NoSQL databases (MongoDB, Redis).
• Integrated publisher-subscriber systems and message queue architectures (SQS, Kafka).
• Configured secure authentication and authorization systems (OAuth 2.0, OpenID Connect) using AWS Cognito and Spring Security.
• Architected scalable patterns like API Gateway, Circuit Breaker, Saga, CQRS, and Event Sourcing to enhance reliability and performance.
• Built middleware solutions integrating complex APIs and third-party services for seamless system interactions.
• Achieved cloud-native architectures with AWS services, including S3, EC2, Lambda, API Gateway, RDS, DynamoDB, SNS, SQS, EKS, ECR, and ECS.
• Delivered a centralized CI/CD pipeline, reducing deployment time by 80% through automation and standardization.
• Integrated observability tools such as Prometheus, Grafana, Datadog, and CloudWatch, improving monitoring and troubleshooting capabilities.
• Automated IaC provisioning with Terraform, ensuring consistent and scalable environments across development, testing, and production.
• Enhanced logging and visualization using the ELK stack (Elasticsearch, Logstash, Kibana).
• Optimized release processes, ensuring efficient and error-free deployments, resulting in a 30% reduction in production bugs.
• Lifted services to the cloud, transitioning legacy systems to a cloud environment to improve scalability and performance.
• Automated infrastructure tasks with Python, streamlining workflows such as S3 file uploads and SQS event handling.
• Crafted Python scripts to test AWS services locally using LocalStack, achieving 98% accuracy.
• Designed and architected large-scale, scalable enterprise applications, performing end-to-end, unit, and integration testing, reducing production bugs by 25%.
• Designed and developed web applications using Angular, HTML, CSS, and JavaScript.
• Integrated advanced security measures into the DevSecOps pipeline, including SAST with SonarQube, DAST using OWASP ZAP, vulnerability scanning with Snyk, container image scanning via Trivy.
• Mentored 5+ junior developers in Java, Kotlin, and microservices, boosting team productivity by 20% within six months.
• Facilitated workshops on modern architecture, DevOps, and cloud integration practices, enhancing team proficiency.

• Developed ERP software for B2B supply chain management with accounting, inventory, and machine learning-supported warehouse management, integrated with EDI modules
• Developed native Android and iOS apps
• Setup Linux servers, VMWare ESX and MySQL8 Server
• Cloud deployment with AWS (EC2, RDS, S3) and Ionos
• Experienced in setting up CI/CD pipelines using tools such as Jenkins, GitLab CI
• Supported B2C software development processes with international teams

• Head of technical overall integration NSC (National Secure Cloud project with about 60 employees).

• Technical integration of all subprojects into one product, definition of interfaces, basic components of a cloud including hardware, technical architecture of the IABG base.

• Development of a Cloud Management Platform (CMP) that can create a private/mixed cloud of any complexity based on a textual description with one click or interactively.

• CMP also includes the complete hardware management cycle.

• As a foundation, it uses Kubernetes, OpenStack, and Hadoop.

• The management layer includes Harbor, Gitea, Longhorn, Keycloak, Rancher and Jenkins, which are automatically configured.

• The private cloud can run any customer workloads, including a full Hadoop stack with HDFS, Spark, MapReduce, Mesos, HBase and around 20 other ML/DL technologies.

• Hadoop worker clusters can also be automatically installed on bare metal or commodity hardware without Kubernetes.

• OpenStack with Nova, Neutron, Ironic, Swift, Cinder, Ceph.

• Development of a Java application Rudi: SOAP, REST, containers, database.

• Technologies: Kubernetes (K3s, RKE2, Minikube, Harbor, Gitea, Jenkins, Longhorn, Keycloak, Rancher), OpenStack (Nova, Neutron, Keystone, Swift, Ceph, Cinder, Sahara, Magnum, Kayobe, Kolla, Bigrost, Ironic), Hadoop (HDFS, Ambari, Solr, Livy, Ranger, YARN, Tez, HBase, Kafka, Hive, Zookeeper, MapReduce, Spark, Oozie, Flink), virtualization (Kubernetes (K3s), VMware, Oracle), scripting (Ansible, Puppet, Juju, Shell, Groovy, Gradle, Maven).

• Implementation of a cross-hierarchy metrics system and shop floor management (SFM)
• Development and support of structured cross-hierarchy problem-solving processes
• Development of strategies and organizational models for value stream-oriented leadership
• Takt planning of assembly lines with multiple vehicle and engine variants, including development of standard work sheets (SAB)
• Material supply along assembly lines, including delivery and demand signaling, as well as setting up picking stations, supermarkets, and routing
• Introduction of GAB & GAE, reducing setup times, and establishing machine scheduling planning
• Designing and implementing a worker guidance system for assembly (including coordination with programmers)
• Taskforce for semiconductor distribution, consolidating global inventories, demands, and supply chains
• Improving quality through Six Sigma analyses and standards for textile printing machine parameters
• Reorganization of coordination processes in sales

• Under the brands Web.de, GMX, 1und1, and Mail.com, offers email and cloud services used daily by millions on iPhones.
• As part of a 10-person team, added new features, refactored legacy code, and increased test coverage.
• Features: Email and cloud access, compose email, email and cloud sync, news, contact, multiple account management, synchronization, notifications, premium features, ads.
• Technologies used: UIKit, SwiftUI, Combine, VIPER, Unit tests, UI tests, Snapshot tests, Fastlane, Cocoapods, MailCore.