Senior Back End Developer

2 weeks ago

Najafgarh, Delhi, India Jumbo Full time

About the Company:

Jumbo is pioneering the future of gaming with the world's only No Money Loss Gaming app. Our innovative platform allows users to win money by playing games without the risk of losing their stake, even if they don't win the game.

Imagine playing a game of Poker with ₹1,000 which you end up losing. What if you could reuse those ₹1,000 to buy a Domino's Pizza? Or to watch a movie at PVR, or buy your favorite headphones?

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:

  • 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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