Freelancer profile translated to English.
Back to original languageAbout Johannes
Software developer with a strong product focus from repeated startup experience.
In addition to deep knowledge in Javascript & React, I have knowledge in SEO, Product Development, Business, and Marketing (Content, Social Media, Email) from my startup experiences.
This enables me to write clean and scalable code, as well as keep an eye on other areas and communicate effectively with stakeholders.
Selected Resources:
React Architecture- A series of videos and blog posts on Clean Architecture and React Apps
German
Native or bilingual
English
Fluent
Turkish
Conversational
Can work on-site
Berlin (up to 50km), Berlin (up to km)
Experience
- DKB CodefactoryFrontend DeveloperJanuary 2023 - September 2024 (1 year and 8 months)• Banking web application with millions of monthly users• Responsible for the architecture and implementation of multiple product checkouts like the credit card ordering process• Part of a end-to-end testing task force aiming at improving test coverage and the quality and performance of the test suites• Creation of the concept and implementation of a cross-team tracking library• Worked in multiple cross-functional teams with up to 20 developers• Technologies: React, TypeScript, Redux Toolkit, styled-components, React Testing Library, Playwright, Node.js, Gitlab
- Osram Innovation HubFrontend JavaScript DeveloperMarch 2019 - October 2019 (7 months)• Frontend for IoT project lightelligence.io• Technologies: React• Responsibilities: Developing the frontend UI as a representation for the lightelligence API
- Profy.devFounderJanuary 2020 - September 2024 (4 years and 8 months)• Created the "React Job Simulator" program for aspiring Junior React developers with to this date ~100 students• Built the course platform with Next.js, Tailwind, GraphQL• Created a professional codebase for the students to work on• Mentoring and code reviews for students• Content marketing with popular blog posts shared in renominated newsletters• SEO optimisations leading to currently ~10k monthly organic visits• Technologies: React, Next.js, styled-components, GraphQL, Cypress, Nest.js, Railway, DGraph cloud
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Education
- Diploma PhysicsUniversity of Potsdam2014