Freelancer profile translated to English.
Back to original languageAbout Joschua
I support companies in the development, further development, and modernization of web applications, platforms, and internal tools.
My focus is on full-stack web development with an emphasis on performant backend systems, clean frontends, and scalable technical solutions. I quickly familiarize myself with existing systems, take responsibility, and provide support where software needs to be implemented in a stable, maintainable, and practical way.
I provide particular support with:
- Development of web applications and digital platforms
- Internal tools and operational business systems
- Backend development and interfaces
- Frontend development and user interfaces
- Performance optimization and scalability
- Modernization of existing applications
I work in a structured, pragmatic way and with a high standard of quality. My goal is not just functional code, but software that improves processes and reliably creates added value in everyday use.
German
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Elektrohub GmbHFull-Stack Engineer E-CommerceE-COMMERCEFebruary 2024 - February 2026 (2 years)Hamburg, Germany- As the sole developer, I was responsible for the further development of a business-critical e-commerce and operations platform to support order, catalog, and customer processes.- Drove the modernization of central platform areas from Laravel/PHP to NestJS/TypeScript to significantly improve maintainability and scalability.- Developed and managed 5 external integrations based on REST APIs, Shopify GraphQL/Hydrogen, and an FTP-based order exchange with Galaxus.- Reworked the internal, React-based B2B platform for approximately 20 users, resulting in a significantly faster and more responsive system.- Improved the performance of critical database queries from over 10 minutes to a few seconds, often reducing runtimes by around 80%.- Supported the reliable processing of over 10,000 orders through platform improvements, analytics dashboards, automated tests, and responsibility for production operations with Docker, CI/CD, DigitalOcean, Vercel, Sentry, and backups.- Also worked on external projects with Symfony PHP and Vue.js.
- Nistech GmbHApprenticeship as an IT Specialist for Application DevelopmentSOFTWARE PUBLISHINGAugust 2021 - January 2024 (2 years and 5 months)Heide, Germany- Took on real responsibility in software development early on and worked significantly beyond the usual scope of an apprenticeship.- Improved central UI areas and the application logic of a C#/.NET/WPF system through major refactorings and the implementation of new features.- Optimized database queries, fixed problems in production, tested changes, and delivered new features that were directly used by customers.- Expanded the product with new features, including a module for medical data and an IntelliSense-related feature.
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Certifications
- IBM Full Stack Software Developer SpecializationCoursera2023
- EF SET English Certificate 77/100 (C2 Proficient)EF Standard English Test (EF SET)2024