Senior Backend Developer
Experience Level: Senior (2–5 Years)
Employment Type: Full-Time
Location: Emarah Suites, Shara e Faisal, Karachi
Working Hours: 11:00 AM – 8:00 PM (Tentative)

About the Role

We are seeking a Senior Backend Developer who can take ownership of backend architecture, build scalable systems, and contribute to technical decision-making across the product.
In this role, you will not only write backend services but also design system architecture, improve performance, enforce best practices, and mentor junior developers where needed.
You will work closely with cross-functional teams including frontend, product, and DevOps to deliver reliable, scalable, and production-grade systems.

Key Responsibilities

Design and own scalable backend architecture using Node.js, Express.js, and NestJS
Build and maintain high-performance, secure, and well-structured RESTful APIs
Lead integration of complex payment systems, including:
- Subscription-based billing systems
- One-time payments
- Webhooks and event-driven flows
- Refund and reconciliation systems
Design and optimize database schemas and queries for both SQL and MongoDB
Architect and implement real-time systems using WebSockets
Deploy, manage, and optimize backend infrastructure on AWS
Identify bottlenecks and improve system performance, scalability, and reliability
Establish coding standards, best practices, and contribute to code reviews
Collaborate with product and engineering teams on system design and feature planning
Ensure strong focus on security, authentication, and API integrity
Debug production issues and drive root-cause analysis

Required Skills & Experience

2–5 years of professional backend development experience with production systems
Strong hands-on expertise in:
- Node.js
- Express.js
- NestJS
Deep experience with both:
- MongoDB (schema design, performance tuning)
- SQL databases (MySQL or PostgreSQL)
Proven experience integrating and maintaining payment systems at scale
Strong understanding of event-driven architecture and webhooks
Experience building real-time applications using WebSockets
Solid AWS experience including:
- EC2
- S3
- IAM
- Deployment and infrastructure management
Strong knowledge of:
- System design and scalable architecture principles
- Authentication, authorization, and API security
- Performance optimization techniques
Proficient with Git and team-based development workflows

Nice to Have

Experience with Docker and containerized deployments
Exposure to CI/CD pipelines and automation workflows
Experience with distributed systems and microservices architecture
Knowledge of message queues / background processing systems (e.g., Redis queues, RabbitMQ)
Experience with monitoring, logging, and observability tools
Ability to contribute to architectural decisions and technical roadmap

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