Stefan Gräfe
@stefangrfe
Senior full‑stack engineer and technical lead specializing in Java, web, and AI-enabled tooling.
What I'm looking for
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
Freelance IT Consultant
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.
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.
Software Engineer
Gemalto
Jan 2002 - Dec 2003 (1 year 11 months)
Software engineer (2002–2003) working on security and embedded software solutions as part of the Gemalto (formerly Gemplus) engineering team.
Education
Degrees, certifications, and relevant coursework
Hochschule Merseburg (HSM)
Diploma (FH), Computer Science
Completed a Computer Science diploma (Fachhochschule) at Hochschule Merseburg, concluding in 2011.
Elisabeth-Gymnasium
High School Diploma, General Secondary Education
Attained High School diploma (Abitur) from Elisabeth-Gymnasium in 1997.
Tech stack
Software and tools used professionally
OpenAPI
Tokio
Kubernetes
PostGIS
MySQL
PostgreSQL
MongoDB
MariaDB
Hadoop
Shopify
Node.js
Symfony
.NET
Redis
Terraform
PhpStorm
Gradle
Quarkus
Jackson
Vue.js
AngularJS
React-Vue
Webpack
JavaScript
HTML5
Java
ES6
PHP
Kotlin
JSON
XML
OpenLayers
Grafana
Prometheus
Ubuntu
Linux
iOS
Gemini
Elasticsearch
Solr
WordPress
Avro
PHPUnit
NGINX
JBoss
SQL
Clickhouse
Axum
ArgoCD
TiDB
Zod
Availability
Location
Authorized to work in
Website
corequip.deJob categories
Skills
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