Back End Developer

5 days ago

Najafgarh, India Jumbo Full time
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:
2–4 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

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