Open to opportunities

Stefan Gräfe

@stefangrfe

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Senior full‑stack engineer and technical lead specializing in Java, web, and AI-enabled tooling.

Germany

Message

What I'm looking for

I seek senior engineering or technical‑lead roles where I can guide architecture, mentor teams, modernize systems, and deliver secure, AI‑enabled products.

I am a senior full‑stack engineer and technical lead with over 35 years of IT experience, including 27 years in professional environments, focused on Java, PHP, modern web frontends and AI/LLM integration. I deliver pragmatic, secure and tested solutions across the entire lifecycle—from requirements and architecture to implementation and operations.

I design and implement backend systems with Java/Spring Boot and PHP/Symfony, create typed REST APIs (OpenAPI), and build frontends using TypeScript with React, Vue or Angular. I ship AI-powered tooling such as template/code generators with Gemini/OpenAI-compatible backends, structured validation (Zod), live previews and versioned artifacts.

As a Team Lead / Principal Engineer I set technical direction, roadmaps, architectures and standards, improve delivery through measurable goals (lead time, MTTR, error rate), mentor teams, and drive incremental modernization (feature flags, strangler pattern) while ensuring reliable releases and strong security and testing practices.

Experience

Work history, roles, and key accomplishments

Current

Freelance IT Consultant

Current

core.equip

Jan 2011 - Present (14 years 9 months)

Providing end-to-end full‑stack engineering, architecture and delivery leadership for clients since 2011, delivering AI-powered templating/code generators, modernized Symfony/Java systems, and observability/automation platforms to improve lead time, MTTR and reliability.

Java PHP Symfony React TypeScript Docker Kubernetes CI CD Prometheus

Senior Software Engineer

Infoware GmbH

Jan 2009 - Dec 2011 (2 years 11 months)

Worked as senior software engineer (2009–2011) contributing to backend and frontend systems, implementing robust services and integrations to support product delivery and operations.

Java Spring REST)HTML5 JavaScript SQL Git Junit Tomcat Architecture REST

Senior Software Engineer

Rovocon GmbH

Jan 2003 - Dec 2009 (6 years 11 months)

Senior engineer (2003–2009) delivering web and enterprise software components, focusing on reliable backend services, integrations and performance optimizations.