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Category: Technology Location: We're looking for a Senior Backend Engineer with deep expertise in Java to build resilient, high-throughput, low-latency distributed systems capable of handling tens of thousands of concurrent requests. You'll own end-to-end supplier integrations, working directly with external suppliers to implement REST API and webhooks integrations.The role requires strong product intuition and a deep understanding of the full passenger lifecycle, from bookings and order creation to modifications and cancellations, as well as how these workflows operate reliably across a multi-tenant platform. Own the supplier integrations process from gathering requirements and API design through production deployment and ongoing partner relationships. Integrate with supplier APIs (RESTful/webhooks) by implementing secure, reliable connections that handle authentication, rate limiting, retries, and complex error scenarios. Build event-driven microservices that process high-volume transactions with strict latency requirements across a multi-tenant architecture. Deploy and operate production services on AWS with monitoring and observability, maintaining 99.99% uptime SLA. Requirements 5+ years backend engineering experience with ownership of production systems serving at least 10,000+ daily active users. Ability to gather requirements from suppliers, analyse integration specifications, and communicate effectively with key stakeholders throughout the integration lifecycle. Expert in Java, with extensive experience writing concurrent, multithreading, and asynchronous code for high-performance systems. Deep expertise with Spring ecosystem (Spring Boot/Data/Security), building scalable APIs and microservices. Proven ability to integrate and operate RESTful APIs with third-party suppliers, handling authentication, rate limiting, and error scenarios. Strong understanding of distributed systems: event-driven patterns, messaging brokers (eg. RabbitMQ, Kafka, AWS SQS/SNS), and resilient design (idempotency, circuit breakers). Proven experience with both SQL (Postgres/MySQL) and NoSQL (MongoDB), knowing when to use each technology. Skilled in AWS infrastructure, Docker, CI/CD, infrastructure as code, and production monitoring. Mentor team members when required through code reviews and architectural guidance while communicating technical decisions to stakeholders. Benefits Above-market base salary (location-adjusted) + meaningful equity (3-year vesting schedule). Fully remote. Travel perks, events, and hands-on access to Arcube’s ancillary products including lounges, eSIMs, car rentals, and more. Early-stage well-funded startup with real ownership and impact on the company's success. DetailsOriginally posted on Himalayas