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About the Role Join Sanfour as a Senior .NET Full Stack Developer in Hyderbd, Telangana. You will be a key contributor in our Accounting & Finance pod, enhancing payment, billing, and invoicing features across our product suite. This role involves working with Stripe Connect integrations, client-native payment processing, hosted payment pages, ACH, eCheck (US), PAD/ACSS debit (Canada), surcharging, recurring billing, payouts, trust accounting workflows, and reconciliation. You will also help migrate firms from legacy processors to our unified payments gateway. Key Responsibilities Architect and develop end-to-end full-stack payment features including UI, API, service logic, and data models for invoicing, billing, hosted payment pages, payment method management, recurring billing, refunds, payouts, and reconciliation. Implement Stripe Elements, Payment Element, Checkout, and 3D Secure (3DS) / Strong Customer Authentication (SCA) on the front-end using React/Next.js. Design and maintain backend services with C#/.NET microservices including PaymentIntents, webhook handlers, idempotency models, and SQL Server schemas. Build idempotent, retry-safe, and observable payment workflows with webhook-driven UI and responsible optimistic updates. Ensure ledger correctness and compliance with trust accounting rules, handling gross settlement and strict trust vs operating account separation. Mentor mid-level engineers through code reviews and set the technical standards within the pod. Influence architecture decisions across front-end and back-end stacks. What Were Looking For Strong experience with full-stack development using React/Next.js and C#/.NET microservices. Deep understanding of payment systems, including Stripe integrations and payment security protocols like 3DS and SCA. Experience designing scalable, reliable, and secure payment workflows and reconciliation processes. Ability to work hands-on as a senior individual contributor without direct people management responsibilities. Excellent problem-solving skills and ability to mentor and guide mid-level engineers. Location: Hyderbd, Telangana, India (On-site role, not remote eligible) Employment Type: Full-time Company: Sanfour .
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