Senior Backend Developer – Node.js / NestJS

Company: NuSwipe Technology Pvt. Ltd.

Employment Type: Full time

Work Mode: On-site (New Delhi/Gurugram)

Experience Required: 4–6 Years About Nuswipe:

NuSwipe Technology Pvt. Ltd. is a corporate rewards, digital gift card, loyalty, and incentive solutions company. We help businesses reward and engage their employees, customers, sales teams, channel partners, and dealers through digital gift cards, customized reward programs, corporate gifting solutions, and technology-enabled engagement platforms.

Our solutions are designed for employee recognition, sales incentives, channel loyalty, customer engagement, festive gifting, and corporate reward programs. We work with businesses to make reward distribution faster, more flexible, and easier to manage through a unified technology platform. We are looking for an experienced Senior Technical Lead / Full Stack Architect who can take ownership of the platform’s technical architecture, guide the development team, and help us build a secure, scalable, and high-performance technology ecosystem.

About the Role:

NuSwipe Technology Pvt. Ltd. is looking for a Senior Backend Developer – Node.js / NestJS to join our growing engineering team. We are looking for a strong, hands-on backend engineer who can build secure, scalable, reliable, and transaction-intensive backend systems using Node.js, NestJS, and TypeScript.

You will work closely with our Technical Lead / Full Stack Architect, Frontend Developer, and Flutter Developer to develop production-grade backend services, APIs, third-party integrations, transaction workflows, and other core platform capabilities. This is a hands-on development role for someone who enjoys solving complex backend problems and taking ownership of modules from development through production. Key Responsibilities:

Design, develop, test, and maintain backend applications using Node.js, NestJS, and TypeScript.

Build secure, scalable, and well-structured REST APIs.

Develop and maintain integrations with multiple third-party APIs and external services.

Implement reliable payment, order, transaction, and fulfilment workflows.

Integrate payment gateways, webhooks, and server-side payment verification mechanisms.

Work with PostgreSQL for transactional data, including schema design, queries, indexing, and performance optimization.

Implement caching, rate limiting, and asynchronous processing using Redis and appropriate queue technologies.

Handle API failures, retries,



timeouts, idempotency, duplicate requests, and transaction consistency.

Develop authentication, authorization, and Role-Based Access Control (RBAC).

Follow secure coding practices and protect sensitive credentials and application data.

Write clean, modular, reusable, maintainable, and testable production code.

Write unit and integration tests for critical backend functionality.

Participate in architecture and system-design discussions with the Technical Lead.

Participate in pull requests, code reviews, debugging, and performance optimization.

Collaborate closely with React/Next.js and Flutter developers for API integration.

Maintain API documentation using Swagger/OpenAPI.

Troubleshoot development, staging, and production issues.

Contribute to monitoring, logging, deployment, and production-readiness processes.

Follow Git, branching, code-review, CI/CD, and engineering standards established by the technical team.

Required Technical Skills: Node.js – Robust hands-on backend development experience

NestJS – Strong experience building production-grade backend applications

TypeScript & JavaScript (ES6+)

PostgreSQL / SQL – Database design, queries, indexing, transactions and performance optimization

Redis – Caching, rate limiting and background-processing use cases

RESTful APIs – Design, development and integration

Third-Party API Integrations – Strong hands-on experience integrating external services

Webhooks – Implementation, validation and failure handling

API Reliability – Idempotency, retries, timeouts, error handling and duplicate-transaction prevention

Database Transactions & Concurrency – ACID concepts, locking and transaction consistency

Authentication & Authorization – JWT, OAuth 2.0 concepts and Role-Based Access Control (RBAC)

API & Application Security – Input validation, rate limiting, encryption fundamentals, OWASP best practices and secure secrets handling

Payment Gateway Integration – Payment verification, webhooks, failed/pending transactions and refund workflows (preferred)

Asynchronous Processing / Message Queues – BullMQ,



RabbitMQ, AWS SQS or similar (preferred)

AWS – Working knowledge of cloud services such as EC2/ECS, RDS, S3, SQS, CloudWatch, IAM and Secrets Manager

Docker – Containerization and application deployment fundamentals

Git / GitHub / GitLab – Branching, pull requests, code reviews and collaborative development

CI/CD – Working understanding of GitHub Actions, Jenkins or similar pipelines

Testing – Jest, unit testing, integration testing, API testing and Postman

Logging & Monitoring – Production debugging, structured logging and familiarity with CloudWatch/Sentry

Strong understanding of OOP, SOLID Principles, Clean Code and scalable backend architecture Good to Have: MongoDB, Kafka, Kubernetes, Nginx, Microservices Architecture, Event-Driven Architecture, Grafana and Prometheus.

Experience Required: 4–6 years of backend development experience with strong recent hands-on experience in Node.js, NestJS and TypeScript.

Experience with BullMQ, RabbitMQ, AWS SQS, Kafka, or other message/queue technologies will be an advantage.

Required

Experience

4–6 years of professional backend/software development experience

Minimum 3+ years of strong hands-on Node.js experience preferred

Production experience with NestJS and TypeScript

Experience developing production-grade APIs and backend services

Experience with PostgreSQL or similar relational databases

Experience integrating third-party APIs

Experience working with Git-based development and code-review workflows

Experience debugging and resolving production-level backend issues

Ability to independently take ownership of assigned backend modules Preferred Experience:

Experience in FinTech, digital wallets, e-commerce, marketplaces, rewards, loyalty, or transaction-heavy platforms will be highly preferred. What We're Looking For:

We are looking for someone who:

Is genuinely hands-on with backend development.

Can solve problems independently instead of depending on constant supervision.

Understands that transaction systems require more than basic CRUD APIs.

Thinks carefully about failure scenarios and data consistency.

Writes clean and maintainable production code.

Can work effectively under the guidance of a Technical Lead/Architect.

Takes ownership of assigned modules from development through testing and release.

Communicates technical issues clearly.

Is comfortable working in an early-stage product environment.

📌 Senior Backend Developer – Node.js / NestJS (New Delhi)
🏢 NuSwipe Technology
📍 New Delhi