For over 25 years, I have been developing and modernizing web applications—ranging from backends and APIs to modern frontends. I take a hands-on, pragmatic approach, driven by a commitment to taking responsibility and driving things forward.
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Heiko Ramaker
FreelancerAn application is already in use and needs to be enhanced, modernized, or adapted to new requirements. I familiarize myself with existing structures and evolve them pragmatically — without unnecessarily rebuilding what already works.
A new web application, a new business process, or a substantial feature needs to be created. I support you with the concept and technical decisions and handle the implementation — from backend and APIs to the frontend.
Your team may be short on capacity or additional technical experience. I join existing projects, take on tasks or independently owned areas of responsibility, and work directly with your development team.
I develop and modernize complex web applications across the full stack – with a clear understanding of existing structures, business requirements, and the need for maintainable, long-term solutions.
Modernizing existing applications step by step, reducing technical debt, and integrating new requirements – without unnecessarily rebuilding what already works.
Building new features and applications across the stack – from business logic and APIs to modern frontend experiences.
Understanding and challenging business requirements and translating them into robust technical solutions – especially where business logic, existing systems, and multiple technical components intersect.
Upline GmbH since 10/2019
Since 2019, I have been modernizing and extending an established MLM and e-commerce platform — from its PHP/Zend backend and new Python APIs to a SvelteKit frontend.
HDI Versicherung AG 10/2016–09/2019
Project partner: Sevenval GmbH
Multi-year development of REST middleware connecting established insurance services with several frontend applications.
RTL Interactive GmbH 07/2008–11/2011
More than three years of development and enhancement work for rtl.de, vox.de, kochbar.de, sport.de, GZSZ.de, and vip.de.
BMW AG 09/2014–05/2015
Frontend Developer
Project partner: NTT DATA Deutschland GmbH
Refactored and extended the BMW vehicle configurator with unit tests, a gyroscope-controlled in-car view, and responsive support for desktop, smartphone, and tablet.
C&A Mode GmbH & Co. KG 12/2011–04/2012
Frontend Development Team Lead
Project partner: Netrada Management GmbH
Developed and rolled out the C&A online store internationally while leading the frontend team, conducting code reviews, and coordinating with the client and project management.
Novoferm GmbH 11/2018–09/2019
Full-Stack Developer
Project partner: Sevenval GmbH
Built REST middleware for a new storefront, covering login, product, basket, and checkout workflows as well as API tests and documentation.
Uelzener Allgemeine Versicherungs-Gesellschaft a.G. 07/2019–10/2019
Backend Developer
Project partner: Sevenval GmbH
Built middleware for Uelzener’s modernized customer service area, exposing existing SOAP services to the frontend through a REST API.
Vodafone GmbH 06/2015–03/2016
PHP Backend Developer
Project partner: addmore GmbH
Enhanced and redesigned otelo.de, including custom CMS extensions and business-process modules.
Uelzener Allgemeine Versicherungs-Gesellschaft a.G. 05/2018–09/2018
Full-Stack Developer
Project partner: Sevenval GmbH
Developed a dog-insurance landing page with online purchase functionality and a REST API backend that encapsulated several SOAP services.
1-2-3.tv GmbH 03/2016–09/2016
PHP Backend Developer
Developed an internal application for broadcast planning, inventory management, and television-auction costing, connected to several databases.
Sevenval GmbH 01/2018–05/2018
Full-Stack Developer
Developed an application for uploading, storing, and presenting complex insurance records based on the German GDV standard.
Marsh Deutschland 07/2018–12/2018
PHP Backend Developer
Project partner: Sevenval GmbH
Modernized and extended a property management, pricing, and Excel-export application, including bug fixes and on-site installation.
HDI Versicherung AG 03/2019–04/2019
Backend Developer
Project partner: Sevenval GmbH
Developed an application that dynamically generated an insurance purchase frontend and transformed data from several HDI services.
Daimler AG 04/2014–08/2014
Frontend Developer
Project partner: Sevenval GmbH
Developed responsive mobile solutions for Mercedes-Benz dealership websites on the Sevenval FITML framework.
Herrmann & Lenz Services GmbH 01/2013–04/2014
Frontend Developer
Developed a web-based task-planning application with a particular focus on browser compatibility through Internet Explorer 8.
NetFederation GmbH 11/2012–12/2012
Python Backend Developer
Developed a banking website with database design, backend and frontend implementation, and an integrated in-site editing feature.
People Interactive GmbH 10/2012
PHP Backend Developer
Delivered bug fixes and enhancements for einkaufaktuell.de and developed a file-versioning tool for Lufthansa style guides.
CTW Computer GmbH 08/2012–09/2012
PHP Backend Developer / Consultant
Established development structures, Git-based deployment, and ticketing while defining coding standards and conducting code and security reviews.
Kuborgh GmbH 05/2012–08/2012
PHP Backend Developer
Developed a Facebook web application with registration, permissions, voting, chat, file uploads, and video processing.
How I use modern artificial intelligence to deliver projects faster while retaining control and engineering rigor.
Established systems are often only partially documented. AI-assisted analysis helps me understand and structure legacy code faster, identify logic defects more precisely, and resolve complex bugs in a controlled way.
Before implementation, I use AI to evaluate architectural scenarios. This helps us minimize API-decoupling risks early and establish maintainable design patterns.
Whether it is a new API or an interactive Svelte UI concept, AI-assisted code generation produces a technical foundation quickly so the real work can focus on refinement.
Before a pull request, code receives an additional automated quality review. This improves consistency, reduces avoidable errors, and increases maintainability.
Planning a new project, extending an existing application, or looking for support for your team? Send me a short outline. You do not need to have every detail finalized yet.
