Principal Consultant (PHP C#)

Principal Consultant - Global Company 6+ month freelance contract 100% remote English speaking team - B2 required Outside IR35 Overview: We are seeking a highly skilled and experienced Principal Consultant to lead web application development and API integration projects. This role requires expertise in PHP, C#, and digital certificate management, as well as a strong understanding of Public Key Infrastructure (PKI) and cryptography. If you have a passion for developing secure, scalable solutions and enjoy collaborating with cross-functional teams, this opportunity is for you. Key Responsibilities:

• Develop web frontend and backend applications using PHP.
• Design and implement APIs in C# and PHP.
• Create and maintain interfaces with other services, such as GlobalServiceNow or external Root Certificate Vendors, using SOAP/REST.
• Prepare comprehensive service-related documentation, including:
• Managing developments in GIT.
• Internal documentation for the development team.
• End-user documentation for engineers operating developed applications.
• Design and manage a Server-Side Certificate Enrollment Manager in .NET C#.
• Maintain and optimize MSSQL databases.
• Implement certificate enrollment using Windows Native Enrollment APIs, SCEP, and custom enrollment clients.
• Develop and maintain scripts using PowerShell.

• In-depth understanding of Web APIs (REST/SOAP).
• Solid knowledge of Public Key Infrastructure (PKI), digital certificates, and certification authorities.
• Familiarity with Windows Server, Active Directory (AD), Active Directory Certificate Services (ADCS), and Group Policy Objects (GPOs) is a plus.
• Strong grasp of cryptographic principles, including symmetric/asymmetric encryption and digital signatures, is advantageous.

• Proven experience in web application and API development.
• Proficiency in PHP, C#, PowerShell, and database management.
• Excellent problem-solving skills and attention to detail.
• Ability to work collaboratively in a team environment and communicate effectively.