Senior Backend Developer (.Net)

Location: Mumbai - Hybrid

Department: Fitness Force Technology

Location Type: IN_OFFICE

Employment Type: FULL_TIME

• Architect integrations with global payment gateways, including Stripe and Razorpay, to handle recurring subscriptions, retail transactions, and refunds
• Build reliable webhook processing and idempotency safeguards that prevent duplicate charges and keep transactions consistent
• Design and maintain REST APIs in .NET Core that support our Angular and Flutter apps
• Enforce PCI-DSS compliance through server-side tokenization and secure credential vaulting, so raw card data never touches our servers
• Build event-driven services with Apache Kafka to keep financial ledgers and billing states in sync in real time
• Architect data models and optimize MySQL performance across a multi-tenant platform
• Use AI coding tools to accelerate delivery of complex financial systems, while owning the security and maintainability of everything you ship

• 6 to 8 years of backend engineering experience in a SaaS product
• Deep hands-on expertise in C# and .NET Core
• A strong track record integrating payment gateway APIs, including subscription lifecycles, webhooks, and multi-currency transactions
• Experience using AI coding assistants in production, with the fundamentals to debug and support AI-generated code in sensitive financial workflows
• Strong relational database skills, including transaction management and query optimization in MySQL
• Experience building multi-tenant systems and working with event-streaming platforms like Kafka

• Familiarity with Docker, container registries, and CI/CD pipelines
• Experience in the fitness, club management, or membership software industry
• Understanding of how backend APIs connect with Flutter and Angular front ends