Senior Software Developer Java/PHP – Digital Certificates & Archive Migration

Project overview

For a demanding migration project in the area of digital certificates and trust center operation, we are looking for an experienced Senior Software Developer (m/f/d). You will accompany the replacement of an existing electronic archive at an established public client and be involved in the development and operation of the associated services.

Your tasks include analyzing the existing system, developing a migration concept for documents from the old to the new e-archive, overseeing data migration, and decommissioning the old production system. Furthermore, you will analyze, specify, and implement components and system architectures for solutions in the area of digital certificates. You will develop and design order management systems for certificate products using agile development methods and evaluate and refine functional and non-functional requirements.

We expect at least 3 years of practical experience in PHP 5 or higher and at least 3 years of practical experience in Java. Knowledge of X.509, PKI logic, MySQL, SOAP, and XML processing is required. Security requirements and data migration should be familiar to you.

The project runs from December 2026 to December 2028 with an utilization of approx. 30%. The remote share is about 90%, with personal presence at the project start and end, as well as on-site as needed. German (C1/C2) and English (B2) are required. The place of deployment is Berlin.

Project details

• Start: Dezember 2026
• Duration: 24 Monate
• Remote: hybrid
• Location: Berlin, DE
• Rate: 69-69 EUR/h
• Languages: German, English