Berlin Zeitung - Top 1 German News with 12 million users per month.Team size: 6 Frontend Devs, 1 BA, 2 Back-end, 2 QATech stack: AWS, NextJS, React, Node JS, Docker1. Worked as a Key Developer, supporting the entire team, attending daily meetings with customers, and engaging in customer negotiations.2. Increased and improved key performance metrics such as FCP, LCP, and CLS. 3. Design thinking - I integrated complex features like an audio player into the current multi-tenant architectureFedex/Shoprunner - a b2b client side JS bundle for shops.Team size: 4 Frontend Devs + client's team and lot's of integration teams. Tech stack: AWS, Azure, WebComponents, JS, JenkinsI worked as a Team Lead and key developer:1. Orchestrated team workload, balancing code quality, documentation clarity, and meeting business requirements.2. Explored and documented the legacy aspect of the project.3. Set up a testing process for new changes, ensuring production safety, and trained the client's team accordingly.4. Designed a migration plan from AWS to Azure, encompassing components such as Amazon Route 53, S3, CloudFront, GitHub, and Jenkins.5. Assisted in handling complex queries from business users efficiently.6. Collaborated with the client's team to modernize the versioning system, ensuring backward compatibility.7. Conducted interviews to find the right person for my position and facilitate a smooth knowledge transfer."Also participated in speaker activities involving peoples from all world.