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.

Summary

I am a German programmer, qualified in the fields of application and full-stack software development. I offer high quality standards, an agile and methodical approach, planning certainty and reliability.

I completed my vocational training as an IT assistant in Bonn and hold ISTQB® Certified Tester certification. With over 25 years’ professional experience, I have extensive knowledge of front-end, back-end and infrastructure technologies.

I am constantly updating my skills in new technologies, languages and concepts, as well as AI development, and apply these practically in my projects. Thanks to my training and many years of professional experience, I am able to specialise in new challenges independently and in a very short space of time, and to apply them successfully in practice in a targeted, professional and appropriate manner.

Experience

Work history, roles, and key accomplishments

Current

Freelancer / Consultant, Estonia

Current

Non-staff

Jan 2023 - Present (3 years 9 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

Software developer Financial funds

DEVCON CST GmbH

Jan 2003 - Jan 2006 (3 years)

Developing PHP, HTML, and JavaScript web applications for wind farm investment and financing within a financial fund management environment.

PHP HTML CSS Visual Basic JavaScript

Software developer - Consultant

EDV-BERATUNG HEMPEL GmbH

Jan 2001 - Jan 2002 (1 year)

Development of an Oracle Forms application for the Federal Ministry of Labour within a consultancy and outsourcing framework.

HTML CSS JavaScript Oracle Database Forms

Education

Degrees, certifications, and relevant coursework

ISTQB®

ISTQB® Certified Tester

2009 - 2009

QA, manual Testing, automated Testing, Software-Testing, Test-Design, Test Management, Tool Support, Testing throughout the Software Lifecycle

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.