Senior .NET Developer (IAM Integrations)

Join a long-term digital transformation initiative within the mobility and transportation services industry, supporting a leading European provider of fuel cards and fleet services. The company is evolving beyond traditional fuel solutions, expanding into areas such as toll payments, parking services, financial solutions, and sustainable mobility offerings. As part of this journey, the team is modernizing the customer identity platform, connecting legacy systems with modern authentication and access management capabilities. You'll be working on secure customer account experiences, API integrations, and identity-related services used by business customers across Europe. You'll be part of an international squad distributed across Romania, Greece, and Belgium, collaborating on a strategic platform that plays a key role in the company's digital evolution.#LI-RC3

• Develop and maintain backend solutions using C# and .NET
• Build API integrations between legacy applications and modern identity management platforms
• Design and implement secure authentication and authorization flows
• Work on customer identity and access management (CIAM) capabilities, enabling secure account management across multiple digital services
• Integrate and support technologies such as OAuth2, OpenID Connect (OIDC), Single Sign-On (SSO), and Multi-Factor Authentication (MFA)
• Develop and maintain services responsible for token validation, user provisioning, and access management
• Troubleshoot and resolve complex integration, security, and platform-related issues
• Collaborate with developers, analysts, and stakeholders within an international squad to deliver scalable and reliable solutions
• Participate in technical discussions, code reviews, and continuous improvement initiatives.

• 5+ years of experience developing applications with C# and .NET
• Strong experience designing, developing, and consuming REST APIs
• Solid understanding of software integration patterns and distributed systems
• Experience working with authentication and authorization concepts
• Hands-on knowledge of OAuth2, OpenID Connect (OIDC), SSO, or similar identity protocols
• Experience with SQL Server and enterprise-level applications
• Strong debugging and problem-solving skills
• Ability to work effectively in a distributed, international team environment
• Professional English communication skills and a collaborative mindset.