Backend Engineer

Lahore, Punjab, Pakistan

Full Time

Mid Level

Backend Engineer

Location: Onsite (Lahore)
Experience: 2–4 Years
Employment Type: Full-time
Stack: Node.js, NestJS, PostgreSQL, Redis, AWS

Job Overview

We are looking for a Backend Engineer to build, maintain, and improve backend services powering a mobile gaming platform. You will work on core systems including rewards, transactions, wallets, payouts, and admin tools while collaborating closely with senior engineers, product teams, and mobile developers. This role is ideal for someone who enjoys solving backend challenges, writing reliable code, and contributing to scalable systems used by a large user base.

Responsibilities

Develop and maintain backend services using Node.js and NestJS
Build APIs and business logic for wallet, rewards, transactions, and platform features
Contribute to ledger and transaction systems while ensuring data accuracy and consistency
Implement payout workflows and assist in handling reconciliation and failure recovery scenarios
Optimize PostgreSQL queries, indexes, and database performance
Implement Redis-based caching and performance improvements
Work with background jobs and message queues for asynchronous processing
Write clean, maintainable, and testable code following engineering best practices
Debug and resolve production issues while contributing to system reliability
Collaborate with mobile, product, and backend teams to define and implement API contracts
Participate in code reviews and contribute to improving code quality across the team
Assist in designing scalable backend solutions under the guidance of senior engineers
Monitor application performance and help identify bottlenecks and optimization opportunities
Write unit and integration tests to ensure system stability
Contribute to technical documentation and knowledge sharing

Required Skills

2–4 years of backend development experience
Strong proficiency in Node.js and TypeScript
Experience with NestJS or similar backend frameworks
Good understanding of PostgreSQL, including query optimization, indexing, and transactions
Experience with Redis for caching and performance optimization
Experience with message queues such as Bull, BullMQ, SQS, or Kafka
Understanding of REST APIs and backend architecture principles
Familiarity with concurrency issues, race conditions, and data consistency concepts
Experience with AWS services such as ECS, RDS, ElastiCache, or related cloud services
Knowledge of Git workflows and collaborative development practices
Experience writing unit and integration tests using Jest or similar frameworks
Strong problem-solving and debugging skills

Nice to Have

Experience working with wallet, ledger, payment, or transaction-based systems
Exposure to fraud detection, anti-abuse systems, or risk management features
Experience building high-traffic or large-scale backend applications
Familiarity with distributed systems and asynchronous processing patterns
Experience in gaming, fintech, or consumer-facing products

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How many years of experience do you have?*

What is your Current Salary?*

What is your Expected Salary?*

In which Node.js + TypeScript production project have you worked, and what was your role?*

Which backend framework (NestJS or other) have you used, and what system did you build with it?*

In which project did you use PostgreSQL, and what did you use it for (transactions, queries, migrations, etc.)?*

Where have you used Redis, and what was the exact use case (cache/queue/performance/ etc.)?*

Which queue system (Bull / Kafka / SQS / etc.) have you used, and what background job did you implement?*

In which project have you used AWS, and which services did you personally work on (ECS / RDS / etc.)?*

Have you worked on a wallet/payment/reward/transaction system? If yes, what exactly did you build?*

Give an example where you worked on a system where data correctness (no duplicates / no wrong balance) was critical.*

What high-traffic or scalable system have you worked on, and what part did you handle?*

Are you based in Lahore? Or willing to relocate?*

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