Senior Full Stack Software Engineer (Billing)

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Requirements:

• Extensive experience with .NET Core and C# for backend services
• Strong proficiency with Angular, TypeScript, and RxJS for front-end development
• Deep understanding of relational database design, optimization, and SQL Server
• Experience integrating with payment processors like Stripe, PayPal (Braintree), and Bitpay, and implementing their corresponding webhook handlers
• Knowledge of security best practices for handling sensitive payment information
• Demonstrated ability to design and implement RESTful APIs
• Collaborative and adaptable mindset
• Openness and authenticity combined with excellent communication skills
• Excitement and enthusiasm for open source and for better internet security
• Excellent problem-solving skills – you might not know all the answers, but you know how to find and communicate the solution

Responsibilities:

• Design, develop, and maintain scalable billing and subscription management systems that process transactions for millions of global users
• Architect and implement secure payment processing flows across web applications, APIs, and database systems
• Lead the integration of multiple payment provider APIs and webhooks to support global payment methods
• Troubleshoot and resolve complex billing-related customer issues that require deep technical knowledge of our systems
• Optimize database queries and application performance to handle large transaction volumes