Senior Backend Developer (FASTAPI + AWS)

Job Title: Backend Developer (FAST API + AWS)

Location: Pune (Hybrid) Work Experience: 6-8 years

Job Summary : We are looking for a highly skilled Backend Engineer with strong experience in FastAPI, AWS infrastructure, authentication systems, payment integrations, monitoring systems, sockets, and scalable backend architecture. The candidate should be comfortable building production-grade APIs, working with real-time systems, and handling cloud-native deployments. This role involves working on scalable AI-driven web and mobile platforms with integrations across payments, subscriptions, authentication, analytics, monitoring, and real-time communication systems.

Required Skills Backend Development Strong experience with Python and FastAPI Experience designing scalable REST APIs and async backend systems Deep understanding of backend architecture, middleware, dependency injection, and background task handling Strong experience with WebSockets, socket lifecycle management, reconnection handling, and real-time communication systems Experience handling concurrent socket connections and event-driven systems Knowledge of microservice-oriented architecture is a plus AWS & Cloud Infrastructure

Strong hands-on experience with: EC2 S3 DynamoDB Load Balancers Experience with production deployments, scaling, monitoring, and security hardening Understanding of CI/CD pipelines and deployment automation Database Experience Strong experience with DynamoDB Must understand: GSIs (Global Secondary Indexes) Query optimization Partition key design Scaling considerations Single-table design concepts Experience with MongoDB/PostgreSQL is a plus Authentication & Security Experience with Auth0 or similar authentication providers Understanding of: JWT authentication Session handling OAuth flows RBAC / permission systems Secure API design Experience implementing secure backend authorization flows Payments & Subscription Systems Experience integrating Stripe APIs Knowledge of: Subscription lifecycle management Webhooks Payment intents Billing flows Invoice handling Experience with RevenueCat integration for mobile subscription management is highly preferred Monitoring & Reliability Experience with monitoring and observability tools such as: CloudWatch Datadog Grafana Prometheus Sentry Ability to monitor logs, infrastructure health, API performance, socket reliability, and production incidents Experience with alerting systems and production debugging workflows

Additional Preferred Skills Experience supporting Flutter or React-based applications Familiarity with mobile backend requirements Experience debugging production systems and improving reliability/performance

Responsibilities Develop and maintain scalable backend APIs using FastAPI Design secure and efficient backend architecture Manage AWS infrastructure and deployment pipelines Build real-time communication systems using WebSockets/sockets Build payment and subscription systems using Stripe and RevenueCat Optimize DynamoDB schemas and GSI usage for performance Implement authentication and authorization systems Monitor infrastructure, backend services, socket systems, and production environments Improve system reliability, performance, and scalability Collaborate with frontend, mobile, and DevOps teams Participate in debugging, testing, and production monitoring

Ideal Candidate should have: Strong problem-solving ability Comfortable working in fast-paced startup environments Able to independently design and implement backend systems Good understanding of scalability and production engineering Strong ownership mindset and debugging skills