Amazon S3 Experts in Austria

Tech: AWS (Glue, Lambda, Redshift), Airflow, PostgreSQL, Python, PySpark, Metabase, Power BI

Delivered: Analytics-Ready Data Models • Legacy SQL to Cloud ETL Migration • Dynamic Pricing Engine

• Owned and evolved the company data warehouse end-to-end — from ingestion to transformation to analytics-ready dimensional data models on AWS Redshift.
• Collaborated with Analysts, Data Scientists, and business stakeholders to deliver scalable dimensional data models that enable self-serve analytics and streamline dashboarding in Metabase and Power BI.
• Architected end-to-end ETL/ELT pipelines on AWS (Glue, Lambda, Redshift) using Python and PySpark, orchestrated with Apache Airflow (MWAA) for reliability and observability.
• Defined and enforced data quality standards and governance practices across pipelines and the core data layer.
• Led migration of legacy SQL infrastructure into scalable AWS Glue pipelines with distributed PySpark processing, eliminating bottlenecks and reducing downtime.
• Developed a dynamic pricing engine applying automated promotional discounts based on occupancy rates, competitor pricing, and location performance tiers.
• Designed schema mappings to ingest MongoDB data into structured relational systems (Redshift/PostgreSQL).

Project Tech Stack: Python, AWS, Azure, FastAPI, openai, pandas, unittest/pymock

Achievements:

• Engineered automated data extraction pipelines to transform complex Excel datasets into structured formats via LLM-driven workflows.
• Architected a generative slide-deck engine that translates natural language prompts into formatted presentation assets.
• Integrated advanced LLM capabilities with the OpenAI Response API, implementing sophisticated tool-calling and structured output logic.
• Developed and containerized scalable backend microservice using FastAPI, Docker, and OpenShift to host and serve agentic skills.

• Planning and implementation of IT infrastructures for clients
• Automating deployments with AWS CloudFormation and AWS CDK
• Monitoring and optimizing cloud environments and the entire IT infrastructure
• Providing technical support and troubleshooting infrastructure issues
• Collaborating with development teams on CI/CD processes

• I am responsible for providing solution architecture and technical assistance for a migration initiative aimed at transitioning to a new core banking system.
• The project involves replacing in-house development with a commercially available off-the-shelf core banking system operated as SaaS on AWS.
• Duties encompass solution design, technical coordination, supporting development teams, and providing IT support and troubleshooting.
• Managing over 10 global vendors and partners is crucial to project success.
• Technologies: VMWare ESXi, AWS, EKS Kubernetes, Mastercard Payment Transaction Service, Avaloq, A1 Telekom Austria infrastructure, CheckPoint FW, F5, Site-to-Site VPNs, PingID, Futurae SDK, Airlock, UC4/Automic, Firebase, iOS/Android lifecycle management, AWS IAM, AWS AppStream, AWS S3, AWS Transfer Family, QlikView, OpenAPI.

Selected projects:

Kiosk platform – hospitality

• Led a 3-person team while hands-on architecting an edge computing infrastructure for over 15 self-service kiosks in Alpine hotels with unstable connectivity
• Designed a Nomad-based cluster with a WireGuard mesh network for fully automated OTA updates, even during local network outages and offline operation
• Integrated physical peripherals (hotel key card readers, thermal printers) into a containerized deployment pipeline
• Reduced on-site maintenance visits by ~40% through a resilient offline-first architecture and Prometheus-based hardware monitoring
• Tech: Nomad, Consul, WireGuard, NestJS, NextJS, Prometheus, Custom Hardware Provisioning

Multi-tenant SaaS platform – insurance claims processing

• Built and operated the Kubernetes infrastructure for a market-leading claims processing platform (acquired by an S&P 500 company) – with strict compliance and availability requirements
• Designed a multi-tenant EKS cluster with tenant isolation, enabling cost-effective single-instance hosting for multiple customers
• Implemented dynamic spot instance node pools, reducing infrastructure costs by ~20%
• Set up fully automated deployment pipelines (Terraform + GitHub Actions) for uninterrupted releases during business hours
• Tech: EKS, Terraform, GitHub Actions, Prometheus/Grafana/Loki, PHP, GraphQL

Legacy ERP integration – construction photo documentation

• Led a 2-person team in designing and implementing a real-time sync bridge between a legacy Microsoft Access ERP (without an API) and a modern mobile photo app for quality control on construction sites
• Developed a PostgreSQL pipeline with real-time listeners that extract data from 1990s Access databases – without disrupting existing workflows
• Built a resilient upload architecture with a circuit breaker pattern for unstable site connections (S3, NFS, Synology NAS)
• Saved each project manager 2–4 hours per week through automated photo sync instead of manual USB/SD card transfers
• Tech: NestJS, PostgreSQL, React Native (Expo), S3, Synology API, offline-first architecture

• Privacy-first, stateless e-invoice API providing AI-powered extraction, bidirectional format conversion (UBL/CII/ZUGFeRD), batch processing, and validation for German/Austrian e-invoice compliance
• Technologies: Nuxt 4, Vue 3, Nitro, TypeScript, Cloudflare (D1, R2), Stripe, OAuth, AI/LLM integration

• Built and maintained a full-featured React Native mobile app and companion web portal supporting multi-role access and real-time collaboration for service teams.
• Developed a robust NestJS backend using TypeScript, adhering to scalable microservices patterns to support a dynamic task management system.
• Designed and optimized PostgreSQL schemas, using advanced indexing and normalized data models to support patient tracking, tasks, and outcome reporting.
• Integrated Socket.IO to support real-time team communication, task status updates, and instant notifications across mobile and web platforms.
• Developed secure authentication workflows using AWS Cognito, including multi-role login, token refresh, and session timeout handling.
• Leveraged AWS S3 for secure document uploads (patient records, resource materials) with signed URLs and access control policies.
• Connected AWS SNS and SES to automate notifications for escalations, missed follow-ups, and appointment reminders.
• Engineered an admin analytics dashboard using React + Zustand for tracking user activity, case completion rates, and compliance metrics.
• Designed and implemented AI-driven features for task prioritization and patient risk classification using external API integrations.
• Established a robust CI/CD pipeline using GitHub Actions and Docker, achieving automated testing, linting, and environment-based deployments.
• Followed Agile ceremonies (daily standups, sprint planning, retros) while collaborating with QA, BAs, and PMs to deliver high-velocity features.
• Led data protection efforts ensuring full GDPR compliance, including encrypted storage, session control, and user-consent management.
• Delivered a fully responsive UI using DaisyUI-style components for mobile and tablet-first designs, achieving high Lighthouse scores.
• Reduced support tickets by 40% by implementing detailed audit logging and a self-service helpdesk system in the admin interface.

• Tech stack: Flutter/Dart, Unity3D, React, NextJS, JavaScript, TypeScript, HTML, CSS, SASS, SCSS, Tailwind, Bootstrap, Ollama, llama.cpp, LangChain, MCP, RAG, n8n, Node-Red, PlatformIO, Arduino, ESP, C, C++, Python/Django, NodeJS, C#, .NET, PostgreSQL, MySQL, MS-SQL, MongoDB, AWS, Azure, GCP, GitHub Actions, GitLab CI, Azure Pipelines, Ansible, Terraform, Docker, Postman, REST, WebSocket, Figma, Penpot, Adobe Illustrator, Adobe InDesign, VS Code, Android Studio, Visual Studio, Unity3D, Jira, Confluence, Traefik, Rclone, Authentik, pfSense, Cloudflare, Proxmox, MQTT

• Previous projects:

• n8n automation that reads incoming emails from an Office mailbox and routes them to stakeholders

• FastMCP 2 server exposing internal services via REST API to an LLM

• Terraform migration of cloud infrastructure with Azure VMs, network, blob, storage and cloud-init

• Azure Pipelines for automated testing, deployment, and artifact management

• Terraform, Ansible, Cloudflare Tunnel integration with Docker container provisioning and backups

• GitHub Actions CI/CD for Flutter app builds, testing, automated screenshots, and App Store deployment

• Flutter app with SSO, local database, backend integration, BLE synchronization

• GCP setup with Cloud DNS, App Engine, Cloud SQL

• AWS environment with EC2, S3, Route 53, ECS

• Workshops delivered on Docker, Git, Terraform, Ansible, Cloudflare, DevOps, modern software development practices

• Backend development with Python Django REST Framework, PostgreSQL, MQTT

• SSO identity provider with OIDC, OAuth, LDAP, Cloudflare Tunnels, Authentik

• Supported migration of Oracle databases to AWS
• Performed performance tuning both on-premises and in AWS
• Advised on sizing of new databases
• Analyzed Oracle edition switch scenarios
• Designed backup and restore concepts for AWS Oracle RDS
• Configured RDS instances using CloudFormation CLI
• Implemented load balancer and HAProxy solutions
• Migrated data on-premises to AWS S3 using Oracle Data Pump
• Utilized Oracle 19c, Visual Code, Git, and SQL Developer

• Setup and maintain Prometheus and Grafana via Docker for more than 2.000 services.
• Setup CI/CD with Ansible to provision and maintain Prometheus and Grafana.
• Metrics visualization and segregation in multiple dynamic dashboards.
• Setup of real time alerting for critical services.