Back End Developer

About the Role: We're looking for a mid-level Backend Engineer to join our founding team. You'll own backend systems, APIs, and infra on AWS. You'll be solving problems across scalability, fraud detection, and real-time data processing — with huge ownership from day one. Job Details: Experience: 2-5 Years Work Schedule: 6 days a week Location: On-site, South Delhi Responsibilities: Design and build scalable APIs and microservices with Node.js/NestJS (serverless on AWS Lambda) Architect and maintain secure, high-performance backend systems Work with large datasets across Postgres, MongoDB, Redis , and integrate event-driven systems with Kafka Implement and optimize fraud detection & prevention logic to protect platform integrity Set up monitoring and alerting systems for reliability, performance, and security Collaborate with frontend (React Native, Next.js, Reanimated, Redux Toolkit, React Query) to deliver seamless experiences Ensure compliance with data protection and security best practices Participate in code reviews, testing, and documentation Requirements: 2–5 years of experience in backend roles (consumer or transactional products) Strong expertise in Node.js/NestJS and API design (REST/GraphQL) Hands-on experience deploying to AWS (Lambda, RDS, S3, CloudFront, infra automation) Strong working knowledge of Postgres, Redis, MongoDB in production Experience with Kafka or similar messaging systems Understanding of fraud detection algorithms, real-time data processing, and system security (preferred) Solid grasp of data structures, algorithms, and system design Comfortable in a fast-paced startup with ownership of end-to-end delivery At Jumbo, we are proud to offer equal opportunities to all. We embrace diversity and inclusion in every aspect of our work. We are committed to creating an inclusive workplace that respects every individual, regardless of race, gender, sexual orientation, gender identity, religion, age, disability, or background.—everyone is welcome here.