Backend Engineering
High-load systems, microservices, APIs, and payment integrations engineered to scale and perform reliably under pressure. Built on event-driven architecture and measurable SLOs.
- Java
- Spring Boot
- Kotlin
- Go
- Python
Expertise
End-to-end engineering — from high-availability backends to AI-powered features.
AI Integration
Implementing LLMs, RAG architectures, and autonomous agents into production. Expertise in deploying local AI models (on-premise) to ensure strict data privacy, security, and non-disclosure.
- Spring AI
- MCP
- RAG
- Local LLMs / Ollama
Cloud & DevOps
Cloud architecture, CI/CD pipelines, and Infrastructure-as-Code on AWS for maximum scalability, observability, and safe releases.
- AWS / EKS
- Terraform
- GitHub Actions
- OpenTelemetry
Fullstack & Mobile
End-to-end product development from scratch — covering database design, robust APIs, modern web applications (Angular), and cross-platform mobile solutions (Flutter).
- Angular
- Flutter
- Kotlin
- REST / gRPC
- PostgreSQL
- Firebase
Selected Work
Anonymized case studies from production systems.
BackendLead Backend Engineer
Cloud Billing SaaS
- Java 21
- Spring Boot
- Kafka
- AWS
Architected and delivered a high-throughput invoicing pipeline with high availability.
BackendLead Backend Engineer
Modular Payments Platform
- Java 21
- Spring Boot
- AWS
- PostgreSQL
Integrated multiple payment providers featuring an automated failover mechanism and real-time analytics.
BackendLead Backend Developer
Real-Time Collaboration Service
- Java
- Spring Boot
- WebSocket
- Redis
Developed low-latency synchronization for concurrent document editing by multiple users.
BackendBackend Developer
Healthcare Integration Suite
- Java
- Spring
- Cassandra
- gRPC
Ensured secure medical-device integration in strict compliance with US medical-device standards (Class B).
FullstackFullstack Developer
eCommerce Admin Toolkit
- Java 21
- Spring Boot
- Angular
- PostgreSQL
Built an API-first administrative panel to manage catalogs, orders, and customer analytics.
MobileProject Owner & Developer
Wellness Tracker App
- Flutter
- Firebase
- REST
Created and launched a cross-platform mobile application with cloud synchronization and push notifications on iOS and Android.
Current Focus
Building
Outside of client work, I build my own products: transforming ideas into market-ready SaaS solutions, exploring AI tools, and prototyping startup concepts.
SaaS Products
End-to-end product development — from domain modeling and authentication to billing and analytics. Focused, shipped, and scalable.
AI Tooling
Engineering autonomous agents, RAG architectures, and LLM implementations that solve real business problems, beyond basic demos.
Startup Ideas
Validating business concepts, prototyping MVPs, and partnering on early-stage ventures.
Based in Germany
About Me
Software Engineer
Software Engineer with over 7 years of experience building scalable, fault-tolerant systems for Fintech, Healthcare, and SaaS. My core stack includes Java, Spring Boot, AWS, and PostgreSQL. However, I take ownership of the entire product lifecycle — from architecting cloud infrastructure to developing mobile apps and integrating AI into real-world business features.
I strongly advocate for clean code, automated processes, and pragmatic architectural decisions that drive a product forward. My systems ship with automated tests (Testcontainers) and full production observability (OpenTelemetry, Grafana) from day one. I am open to freelance opportunities, exciting collaborations, and ambitious ideas.
Toolkit
Languages
- Java
- Kotlin
- Go
- Python
- TypeScript
Backend & Messaging
- Spring Boot
- Kafka
- gRPC
- REST APIs
Databases
- PostgreSQL
- Redis
- Cassandra
- Flyway
Cloud & DevOps
- AWS
- EKS
- Docker
- Terraform
- GitHub Actions
Observability
- OpenTelemetry
- Prometheus
- Grafana
AI Engineering
- Spring AI
- MCP
- RAG
- LLM APIs
- Ollama
Quality & Security
- Testcontainers
- OAuth2 / OIDC
- Keycloak
- GDPR
Frontend & Mobile
- Angular
- Flutter
Frequently Asked Questions
Quick answers about my services, stack, and way of working.
Which services do you provide?
Backend engineering, AI integration (Spring AI, RAG, MCP), Cloud & DevOps on AWS, and fullstack/mobile applications built with Angular and Flutter.
What is your tech stack?
Java and Spring Boot, Kotlin, Go, and Python on the backend; AWS (EKS, Lambda, S3, DynamoDB), PostgreSQL, Redis, and Kafka for data and messaging; Angular and Flutter for web and mobile. All systems ship with OpenTelemetry-based observability and Testcontainers-based integration tests.
Where are you based, and do you work remotely?
I am based in Germany and open to remote work, freelance engagements, and collaboration across time zones.
Do you integrate AI into production systems?
Yes. I implement LLM APIs, retrieval-augmented generation (RAG) pipelines, Model Context Protocol (MCP) integrations, autonomous agents, and on-premise LLM deployments (Ollama) to keep data private and compliant.
Contact
If you have a project, a collaboration proposal, or an open position, please send me a message. I will respond within 24–48 hours.