Backend Engineer (EV Charging & Payments Platform)

We are building a backend platform for EV charging with real-time charger control, and multi-vendor settlements.

You will own the core backend service that connects chargers, payment gateways, and user flows. The CMS/UI can change; this backend is the system of record.

What You will work on

• Design and build REST APIs for charging sessions and payments
• Integrate Payment Gateway (Razorpay/ Payu/ Cashfree) for UPI, orders, webhooks, refunds
• Implement event-driven flows (payment charger start)
• Build state machines for charger & session lifecycle
• Handle async processing, retries, and idempotency
• Coordinate with physical EV chargers (OCPP or equivalent APIs)
• Ensure secure handling of secrets and webhooks
• Debug real-world edge cases involving payments and hardware

Must Have Skills

• Strong backend experience in Node.js (Express/Nest) or Java (Spring Boot)
• Experience integrating payment gateways (Razorpay preferred)
• Solid understanding of:
• Webhooks
• Async workflows
• API design & error handling
• Experience with PostgreSQL / MySQL
• Comfortable testing APIs with Postman / curl
• Can reason about race conditions and failure scenarios

Nice to Have Skills

• Experience with EV chargers / IoT / OCPP
• Message queues (BullMQ, RabbitMQ, SQS, etc.)
• Basic frontend or mobile web understanding
• Cloud & deployment experience (AWS/GCP/Azure, Docker)

How We Evaluate

• Clear thinking about edge cases
• Ownership mindset
• Ability to explain trade-offs