Senior Java Developer / Consultant
Technical depth. Clear communication. Responsibility when it matters.
Since 2009, I have developed backends for business-critical platforms as a freelance Java developer and consultant. My projects range from the energy sector and a large vehicle marketplace to online retail logistics.
I use Java and Spring to build microservices for business processes, model domains and integrate existing systems. React and TypeScript complement my backend work. German is my native language; I work fluently in English and have experience in an internationally distributed team. I work remotely and, where needed, on site in Germany.
In business-critical projects, the code is only part of the job; dealing with business stakeholders, unclear requirements and mistakes matters just as much. How I work – since early 2026 also with AI agents – is described under Approach.
Role: Senior Fullstack Developer
Developed microservices for business processes and revised existing workflows. Extended a React and TypeScript frontend with responsive views and validation.
Tech: Java 21 · Spring Boot 3 · Oracle · RabbitMQ · React · TypeScript · Camunda · Liquibase
Role: Java Backend Engineer
Integrated external services and built backend services for user data and sales events. Used domain-driven design to guide service development.
Tech: Spring Boot · Apache Kafka · MongoDB · RxJava · Kubernetes
Role: Java Backend Engineer
Provided domain modelling and consulting for a new returns service. Built a full-stack application for delivery notes and shipping labels, and migrated existing inbound logistics software to new technical infrastructure.
Tech: Java 8 · Spring Boot · AWS · Kubernetes · PostgreSQL · Spring WebFlux · React
Role: Java 8 Consultant
Developed reactive backend services for vehicle data and integrated external services. Implemented fallbacks and client-side load balancing to improve resilience.
Tech: Java 8 · Spring Boot · MongoDB · RxJava · Hystrix · Ribbon
I develop Java and Spring Boot services for business processes, usage management and sales events, connecting systems through REST APIs.
Tech: Java 21 · Spring Boot 3 · Spring Data · Spring Security · OpenAPI
I model business domains, for example for returns processes and rights management. Domain-driven design guides my service development.
Tech: DDD · Microservices · Camunda · Arc42
I integrate external services using reactive data streams and messaging. Fallbacks and client-side load balancing support vehicle data processing.
Tech: Spring WebFlux · RxJava · Apache Kafka · RabbitMQ
I develop data services using relational databases and MongoDB. Automated tests and load tests are part of my toolkit.
Tech: PostgreSQL · Oracle · MongoDB · JUnit 5 · Cypress · JMeter · Gatling
I develop backend services in projects using Kubernetes and AWS and migrate existing software to new infrastructure. Container tooling and continuous integration support this work.
Tech: Kubernetes · AWS · Docker · Helm · GitLab · Jenkins
I extend backend systems with React and TypeScript frontends, building responsive views and validation for business applications.
Tech: React · TypeScript · Ant Design · Storybook · Vite
I work closely with business stakeholders and product owners, raise unclear points and risks early, and stay calm when things get critical. I take responsibility even when it is uncomfortable.
Since early 2026, I have worked with AI agents assigned to planning, implementation and testing. I offer this approach for client projects and advise on setting up such teams. It builds on my backend experience since 2009.
I agree AI use and the handling of confidential data with you in advance; responsibility for my work remains with me.
This website was also built with AI agents, separate roles and independent quality assurance.
Please email me to request my CV with further projects and technologies.
Vinzenz van Dyck