Senior C# Developer

Job Title: Senior C# Developer Payment Systems Integration Type of Contract: Full-Time Salary Range: Premium USD Compensation (with performance bonuses) Language Requirements: Excellent English proficiency (written and spoken) REQUIRED We are seeking a skilled Senior C# Developer with strong .NET Core expertise to join our team for a high-impact payment systems integration project. You will be responsible for building and maintaining secure, scalable payment processing solutions that integrate with 250 global processors. Your work will directly support major hospitality and retail clients, ensuring seamless and compliant transactions at scale. Key Responsibilities Develop microservices using C# and .NET Core 8.0 within Linux Docker containers Integrate payment gateways including Stripe, Global Payments, Freedom Pay, and others Implement PCI-compliant iframe solutions for secure payment capture Build and maintain robust RESTful APIs for payment processing Develop React.js (TypeScript) components for frontend payment interfaces Optimize performance for high-volume transaction systems Assist with .NET Core upgrades and modernization initiatives Ensure secure transaction storage and database integration with Azure SQL Must-Have Qualifications 5 years of professional C# development experience with .NET Core/.NET Framework 3 years working with payment systems, fintech, or transaction-heavy platforms Strong experience integrating third-party APIs at scale Background in hospitality or retail payment solutions is highly desirable Hands-on experience with microservices architecture and Docker (Linux containers) Familiarity with cloud platforms (Azure preferred; AWS a plus) Proven ability to design and implement PCI-compliant, secure payment solutions Preferred Qualifications Experience with multi-tenant SaaS platforms Previous migration experience from .NET Core 2.2 to 8.0 Knowledge of React.js with TypeScript and server-side rendering Exposure to monitoring tools such as Datadog and Sentry.io Competitive USD compensation with performance-based bonuses Fully remote work with flexible hours and generous time off Annual learning budget for certifications, conferences, and training Direct collaboration with Fortune 500 clients and growing SMBs Annual company retreat and regular team-building events Support for open-source contributions and speaking engagements Transparent compensation structure with clear career progression J-18808-Ljbffr

Location: São Paulo, São Paulo, BR

Posted Date: 11/4/2025