Full-stack Freelance Developer
2019 - 2020OSRAM- Developed an IoT portal application, part of the platform was built with React and styled-components.
- Developed an open-source React component library based on a custom-designed CSS styling library.
- Participated in architecture meetings for designing REST API and solving technical solutions.
- Led a team of four developers as a substitute for a principal team lead.
Technologies: React, Bitbucket, Kubernetes, Jira, Node.js, CSS, Cypress, PostCSS, React Router, Jest, TypeScript, JavaScriptFull-stack Web Developer
2017 - 2018Ninox Software GmbH- Rewrote and replaced a Node.js REST API for user management.
- Implemented a Node.js web front-end, acting as a payment gateway.
- Implemented an admin front-end for a CRM, including a web forum.
- Created and managed provisioning scripts (Ansible) for automated server configuration.
- Built an infrastructure (staging, production), including Mongo replica set, Redis, HAProxy Load Balancers, and application servers.
- Implemented zero-downtime deployment with continuous delivery.
Technologies: Webpack, Amazon S3 (AWS S3), Ansible, MongoDB, Redis, Node.js, JestFull-stack Web Developer
2015 - 2017firma.de Firmenbaukasten AG- Implemented micro-service web-based applications for CRM, legal document generation, and a website crawler.
- Implemented a static website with S3 and Contentful.
- Created and managed provisioning scripts (Ansible) for automated server configuration.
- Implemented a continuous delivery workflow with GitHub, CircleCI, and Slack.
- Created an npm private module with tests for reuse across microservices.
- Designed the templates-based contract generator, which outputs PDF, DOCX, and HTML.
Technologies: Webpack, Amazon S3 (AWS S3), Ansible, React, Microservices, TypeScript, Node.jsFront-end Web Developer
2016 - 2016CORETransform GmbH- Collaborated with management regarding talent search.
- Trained front-end developers on React, Webpack, and modern front-end development.
- Provided support and code reviews for front-end applications.
Technologies: Webpack, ReactLead Front-end Developer
2013 - 2015Twago - Team2Venture GmbH- Created pixel-perfect implementation (JSP, SCSS, JavaScript) from the provided design.
- Improved the legacy codebase by introducing Backbone and RequireJS.
- Supported the front-end pipeline for compiling static assets with maven.
- Interviewed potential candidates for IT positions.
- Created automated selenium tests for unmanaged UI testing.
Technologies: RequireJS, Sass, Backbone.js, Handlebars, JSPSystem Administrator
2007 - 2011Primabuild- Created an HTML, CSS, JavaScript business-card website.
- Built a Perl CGI-based internal CRM, including server maintenance.
- Supported a small network infrastructure of routers and office computers.
Technologies: JavaScript, CSS, HTML, Windows, Linux, MySQL, PerlLinux System Administrator
2003 - 2003g00Net- Maintained a Linux Network Infrastructure for ISP provider.
- Created routing traffic control for various clients.
- Implemented a traffic statistics CGI web application.
- Supported load balancing of network interfaces.
Technologies: Iproute2, BGP, Linux, Bash, Perl