Architecture that scales
Hexagonal boundaries, microservices, Kafka event streams: structures that absorb the next requirement instead of resisting it.
Eleven years of shipped systems for insurers, railways, and industry.
PatrickBatke
Role
Lead Fullstack Developercertified Software Architect (iSAQB)
Base
Vienna, AT11+ years in production
Fullstack & Architecture · Vienna, ATSpring Boot · Kotlin · React · GCPAbout
Eleven years. Five industries. One standard.
I build the part of software that has to keep working when the demo is over: claims platforms for one of the world's largest insurers, passenger information for Vienna's newest subway trains, data platforms that carry a million records without complaint.
My background is fullstack, my discipline is architecture. Certified (iSAQB), practiced on systems where hexagonal boundaries, event streams, and automated regression tests decide whether a release is boring or a crisis. I prefer boring releases.
I work in Vienna, in German and English, from the first architecture sketch to the production dashboard.
Delivery under deadline
Automated regression tests and clean release cycles. One week saved per sprint, at the last count.
Fullstack, end to end
Spring Boot and Kotlin to React, Angular, and Vue 3, deployed on GCP and AWS. One person, no hand-off losses.
What I don't do
- I don't ship prototypes as products.
- I don't add technology a system doesn't need.
- I don't disappear after the handover.
Experience
Eleven years, end to end.
Lead Fullstack Developer & Software Architect
2024 – nowGlobal Insurance Enterprise · Vienna
- Claims platform for multi-country rollout: customization effort per market down 40%
- Hexagonal microservices: onboarding time down 25%, boundary defects down 30%
- Kafka event processing at 10,000+ messages per second with 99.9% delivery
- Automated regression tests: production incidents down 35%, one week saved per sprint
Senior Fullstack Developer
2022 – 2024Siemens · Vienna
- PI+ passenger information for Vienna's next-generation subway: deployed fleet-wide, uptime up 25%
- Wiener Linien real-time API integration: update latency down 30%
- Media delivery and live streams to the passenger displays on the trains
- Test automation: bug-related incidents down at least 50%
Fullstack Developer
2021 – 2022Freelance · CAESAR · Remote
- Insurance broker platform: portfolio admin time down 30%
- OMDS 3.0 XML integration: 1M+ data records processed
- Portfolio growth monitoring over configurable periods
Fullstack Developer
2019 – 2021Hexagon AB · Vienna
- M.App Enterprise GIS platform: 10+ releases shipped, bug issues down 40%
- Lead developer of the geographic data styling editor: OpenGIS, live preview map
- GIS analyst productivity up 25%
Fullstack Developer
2018 – 2019Neuherz & Partner · Vienna
- Packaging design workflow app: approval time from 5 days to 3
- Party pretzel configurator for a supermarket chain: 90% customer satisfaction
2016 · HTL Donaustadt, Software Engineering · 2023 · iSAQB Certified Professional for Software Architecture
Featured01 / 04
What eleven years produced.
Insurance Claims Platform
Client DeliveryEvent-driven claims processing at enterprise scale: microservices on hexagonal architecture.
Global Insurance Enterprise · 2024 – now
Context
A legacy monolith could not carry the claim volume. Every country rollout cost 40% extra customization effort.
Approach
Kafka event processing at 10,000+ messages per second; hexagonal microservices; automated regression tests across services.
Result
−40% rollout effort · −35% incidents · +60% test coverage
Spring Boot · Kafka · MongoDB · Angular · Microservices
PI+ Passenger Information
Deployed Fleet-WideReal-time passenger information for Vienna's next-generation subway trains.
Siemens · Wiener Linien · 2022 – 2024
Context
Passengers needed live updates across the network with high reliability and low latency.
Approach
Real-time API integration for public-transport data; media delivery to train displays; comprehensive automated testing.
Result
Deployed fleet-wide · +25% uptime · −30% data latency
Java · Spring Boot · TypeScript · Angular
Broker Platform CAESAR
In ProductionFull-stack insurance broker platform with OMDS 3.0 data integration.
CAESAR · Freelance · 2021 – 2022
Context
Brokers lost 30% of their time to manual portfolio data processing.
Approach
Sortable, filterable policy, claims, and commission views; automated OMDS 3.0 XML extraction; growth monitoring.
Result
1M+ records processed · −30% portfolio admin time
React · Spring Boot · XML · OMDS 3.0
M.App Enterprise
GIS platform development across 10+ releases.
−40% bug issues
C#/.NET · Java · Angular · Vue 3
Geo Styling Editor
OpenGIS styling editor with live preview map.
+25% analyst productivity
Vue 3 · OpenGIS
Packaging Workflow
Design approval workflows with in-app feedback.
Approvals 5d → 3d
C#/.NET · Angular · MS SQL
Party Pretzel Configurator
Customer-facing product configurator for a supermarket chain.
90% customer satisfaction
C#/.NET · Angular
Stack
In production, daily.
Used in shipped systems. Not just installed.
Languages
- Java
- Kotlin
- Go
- C#
- TypeScript
- JavaScript
- Python
Frameworks
- Spring Boot
- .NET
- React
- Angular
- Vue 3
- Next.js
Cloud & DevOps
- GCP
- AWS
- Azure
- Kubernetes
- Docker
- Terraform
- GitHub Actions
- Jenkins
Data & Messaging
- PostgreSQL
- MongoDB
- Kafka
- MS SQL
- Oracle
- XML
Architecture
- Microservices
- Hexagonal
- Event-driven
- MVC
Contact
Start with the hard part.
Describe the system you need or the one that hurts. I answer within 24 hours.