Required skills
- Java
- PHP
- MySQL
- Public Key Infrastructure (PKI)
- SOAP
- WSDL
- XSD
- Agile Software Development
- Requirements Analysis
- Refactoring
- System Modernization
- Trust Center Operations
Languages: German · English
Job description
Seeking an experienced Senior Software Developer with expertise in Java, PHP, PKI, and trust center environments for a challenging software development project involving eArchiving and digital certificates.
Project overview
For a demanding software development project, we are looking for an experienced Senior Software Developer with in-depth knowledge of Java, PHP, and MySQL, as well as several years of experience in Public Key Infrastructure (PKI) and the trust center environment.
Responsibilities
- Analysis of the existing system and development of a migration concept for transferring documents from the existing eArchive to the new eArchive.
- Professional and technical support for data migration.
- Support for the decommissioning of the previous production system.
- Analysis, specification, conception, and realization of components and system architectures in the area of digital certificates.
- Evaluation, refinement, and derivation of functional and non-functional requirements.
- Development and conception of order management systems for certificate products using agile development methods.
- Implementation and further development of software components with Java, PHP, and MySQL.
Requirements
- At least 3 years of practical experience in software development with PHP 5 or higher.
- At least 3 years of practical experience in software development with Java.
- At least 3 years of experience in Public Key Infrastructure (PKI).
- At least 3 years of experience in the trust center environment (certified data center operations).
- Many years of experience in refactoring and modernizing existing systems.
- Practical experience with SOAP, WSDL, and XSD.
- Experience in the conception and development of shop systems.
- In-depth knowledge of working with MySQL and relational databases.
- Experience in agile software development and requirements analysis.
Project details
01.12.2026
12+ months
Utilization: 2-3 days/week
Remote + Onboarding and Offboarding in Berlin
Language: German (C2), English (B2)
If you are interested or have suitable recommendations, I look forward to your feedback!
- Start: 01.12.2026
- Duration: 12+ Monate
- Remote: hybrid
- Location: Germany, DE
- Languages: German, English
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