I met Daniel in 2014 at a meeting of the PHP Usergroup Berlin. The group was small that day, which led to an intensive exchange about software development in the web environment. Today, I am very happy about this, as we have now been working together for more than 15 months.
During this time, he has rebuilt a booking system for us based on EasyAdmin and Symfony 5.4, which conveniently covers all critical aspects from booking to invoicing and management.
Previously, our company processed orders using a contact form and a collection of Excel spreadsheets. The COVID-19 pandemic led to many rebookings, making a modern and automated system necessary.
In the current stage of development, we have our own API based on API Platform as well as interfaces to Easybill, Sendgrid, Dropbox, Google Calendar, and other systems. In addition to EasyAdmin and Symfony in our administration backend, Bootstrap & React are used in the customer area. All of this together makes our work much easier and more enjoyable, and we wouldn't want to do without it.
Depending on the issue, we communicated with Daniel by email, phone, video conference, or via a ticket system, and always found good solutions. He offers a full service from planning/architecture to development and operation of our web application, and we are delighted that he will continue to support us.

Daniel Sippel supported our team for two months in the redevelopment of a core feature on our website.

The workbench, where end customers can compile their print projects and publish them later, was redesigned using AngularJS in the frontend and Symfony2 FOSRestBundle in the backend. I already knew Daniel from our time together at MyHammer—when he started at epubli, he had no experience with AngularJS. He taught himself how to use it during implementation. He also impressed in the backend. With his quick grasp of the subject matter, he analyzed our old Zend Framework code and ensured that the new Workbench fit perfectly into the existing environment and that no features were lost.

He also took care of project management and ensured transparency within the team by using Scrum, which meant that the project progressed well. It was also very good and helpful that he actively contributed to the design and advised and supported our product owner with his expertise. Daniel worked independently and always proactively provided me with the current status, so that in the end, nothing was left to be desired in terms of quality and quantity. I am completely satisfied with the work he has done and can recommend him without reservation.

Daniel Sippel supported our team in Symfony2 backend development from December 2014 to July 2015. He has a very good knowledge of Symfony and PHP, is reliable, and works independently. As a real member of our team, he used his deep understanding of APIs—server (FOSRestBundle) as well as client side—to get things done. He was also the main developer of our internal admin interface, written with the help of SonataAdminBundle. He works in a very solution-oriented manner and communicates well with other departments and product owners.

Together with Daniel Sippel as the lead and implementing backend developer, I spent the last four months building the platform https://www.werpflegtwie.de from scratch using Symfony2 (PHP framework). I was and am extremely satisfied with his work. He works quickly and reliably, explains things well, understands quickly, provides competent and helpful advice, and even takes on project management tasks from time to time.
100 points!