Looking for a job

Stephan Rosentreter

@stephanrosentreter

I build full-stack applications, ERP systems, and reliable integrations across insurance, telecom, and media technology.

Estonia

Message

What I'm looking for

I would like to take on new technical challenges. I can quickly adapt to new environments and have a passion for developing great software. I am a Team-Player with Tech-Lead Experience and able to handle stressful situations. I would be delighted to assist you in successfully implementation of your projects and to support your team with my knowledge and experience.

I was born in Cologne, am a German citizen, and live in Estonia. I offer language skills in German as my native language and English B2+ (Upper Intermediate).

I am a qualified full-stack software developer, a certified QA engineer and a trained IT specialist with over 25 years’ professional experience. I have extensive knowledge in front-end, back-end and infrastructure technologies. I build full-stack applications, ERP systems, and reliable integrations across insurance, telecom, and media technology. I played a key role in ensuring stable asynchronous processing and integration in the areas of document generation, payment processing and product management.

I completed my vocational training as an Information Technology Assistant in Bonn and holding a certification as an ISTQB® Certified Tester. During my time in the telecommunications sector, I worked remotely for over 9 years in distributed international teams where English was the corporate language. I have already implemented RAG AI architecture using the Laravel AI SDK with Document Chunking, Embedding caching, Vector Similarity Search, Reranking, Conversation memory and am currently testing AI agents for code interaction, such as Copilot and Claude.

Maybe there is a solution for working from home in Estonia—that would be great. Please don't hesitate to request more information.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer Full-Stack

Current

Non-staff

Jan 2023 - Present (3 years 7 months)

Developed Spring Boot, Node, PHP, Laravel, and React applications for personal and professional use in the field of information technology.

Spring Boot Node PHP Laravel React AI Tools AI Agents

Software Engineer Full-Stack

Gothaer

Feb 2021 - Jul 2022 (1 year 5 months)

Development of Spring Boot, and React applications for claims settlement, correspondence management, and metadata processing.
I played a key role in the migration from Java EE to Java Spring Boot and Spring Kafka, with the aim of ensuring stable asynchronous processing and integration in the areas of document generation, payment processing and product management.

Spring Boot Kafka Vue.Js React

Software Engineer Full-Stack

LANG AG

Apr 2017 - Apr 2020 (3 years)

Development of ERP systems in Java with automated document creation, versioning and management. In this context, I created microservices in Java Spring Boot for dashboard systems and order management in sensitive production areas. I gained in-depth knowledge of all key aspects of production, business processes, the flow of goods, cloud computing and hardware development.

Java EE Vaadin Spring Boot React TypeScript Angular

Software Engineer Front-End

Gemalto GmbH

Jun 2006 - Nov 2014 (8 years 5 months)

Remote working in distributed and international teams to develop the world’s first web portal featuring synchronisation of digital life management via mobile devices in the telecommunications sector.
I played a key role in the migration from HTML4 to HTML5/CSS3, mobile-first responsive design, and integration of calendars, contacts, payments, social network and product management.

Prototyping Team Leadership Branding Social Networking

Education

Degrees, certifications, and relevant coursework

Heinrich-Hertz-Berufskolleg Bonn

State-certified IT Assistant, Information Technology

1997 - 2000

Completed vocational training as a State-certified IT Assistant with a focus on programming, web design, network technology, electrical engineering, technical informatics, and process control.