Fractional CTO / Principal Product Software Engineer / AI Coding Experte

Principal Product Engineer and Software Architect with 20 years of experience shipping software products -- from medical wearable firmware to enterprise insurance platforms serving millions. I own the full loop: user problem, architecture, code, production. Scaled engineering organizations to 300+ people, then chose to return to building. Now I ship at startup speed using disciplined AI-assisted engineering, with the judgment that comes from two decades of building, scaling, and leading.

I operate across the entire stack -- embedded firmware, mobile apps, backend services, cloud infrastructure -- and bring executive-level communication skills from years of advising C-level stakeholders on technical strategy. My clients range from Fortune 500 insurers to seed-funded deep tech startups.

- 0-to-1 product builds: architecture, implementation, and production deployment

- Platform architecture audits and modernization strategies

- Technical leadership for scaling engineering teams and organizations

- Interim CTO / Head of Engineering for startups preparing for growth or funding rounds

- Event-driven architecture design (Kafka, CQRS, Domain-Driven Design)

- Full-stack prototyping at high velocity using AI-assisted engineering

INDUSTRIES: Insurance, MedTech, Mobility/EV Charging, Sports Tech, PropTech, Finance, Reinsurance

Programming Languages: Kotlin, Java, Go, TypeScript, C, Dart, SQL

Backend: Spring Boot, Quarkus, Node.js (Nest.js, Express), Gin, gRPC

Frontend & Mobile: Angular, React, Flutter

Cloud & Infrastructure: AWS (Lambda, ECS, DynamoDB, AppRunner, Step Functions, S3), GCP (Pub/Sub), Docker, Kubernetes, Terraform, Helm, ArgoCD

DevOps & CI/CD: GitHub Actions, Jenkins, Tekton, IaC (Terraform, AWS CDK)

Databases & Messaging: PostgreSQL, TimescaleDB, MongoDB, Redis, DynamoDB, Kafka (Confluent, Connect, Streams, AVRO), MQTT

Embedded & IoT: Nordic nRF, Zephyr OS, BLE/GATT, ESP32, PlatformIO, OCPP

Architecture: Microservices, Event Sourcing, CQRS, Domain-Driven Design, Hexagonal Architecture, Modular Monolith, REST, GraphQL

AI Engineering: OpenAI API, Claude Code, Augment Code, LangChain, Vector DBs

Methods: Event Storming, Scrum, Kanban

Spoken Languages: German (Native), Polish (Native), English (Fluent)