Lead Node.JS

Key Responsibilities

Microservices Architecture & Development

• Design, develop, and maintain Node.js microservices using Express.js framework following RESTful API principles
  
• Build event-driven, scalable microservices architecture to support high-volume transaction processing
  
• Implement service-to-service communication patterns (REST, message queues, event streaming)
  
• Ensure loose coupling and high cohesion across microservices boundaries
  
• Design and implement API gateway patterns and service mesh architectures

Payment & Transaction Processing

• Develop secure payment processing services integrating with multiple payment gateways (TSYS, Fluidpay, Ingenico)
  
• Build transaction management services handling authorizations, voids, refunds, and settlements
  
• Implement idempotency and retry mechanisms for critical payment workflows
  
• Design real-time transaction processing pipelines with MongoDB change streams

Integration & API Development

• Build robust API endpoints consumed by Android app and web admin dashboard
  
• Integrate with third-party systems including CRM platforms, authentication services, and carrier systems
  
• Develop webhook handlers and event processors for asynchronous integrations
  
• Create and maintain comprehensive API documentation (Swagger/OpenAPI)

Database Design & Optimization

• Design and optimize MongoDB schemas for high-performance read/write operations
  
• Implement data modeling best practices for document-based databases
  
• Build efficient aggregation pipelines and indexing strategies
  
• Ensure data consistency across distributed services using appropriate patterns (sagas, two-phase commits)

Security & Compliance

• Implement security best practices including encryption at rest and in transit (TLS 1.2+)
  
• Ensure PII data protection and PCI-DSS compliance requirements
  
• Build authentication and authorization mechanisms (JWT, OAuth 2.0, OTP-based flows)
  
• Implement rate limiting, request throttling, and security hardening measures
  
• Conduct security audits and vulnerability assessments

DevOps & Deployment

• Containerize microservices using Docker and orchestrate with Kubernetes
  
• Implement CI/CD pipelines for automated testing and deployment
  
• Set up monitoring, logging, and alerting systems (ELK stack, Prometheus, Grafana)
  
• Optimize application performance and conduct load testing
  
• Implement blue-green deployments and canary releases

Required Qualifications

Technical Skills

• 
  5+ years of professional experience with Node.js and Express.js in production environments
  
• 3+ years of hands-on experience building and deploying microservices architectures
  
• Strong expertise in MongoDB, including schema design, aggregation framework, indexing, and replication
  
• Deep understanding of RESTful API design principles and best practices
  
• Experience with message queuing systems (RabbitMQ, Kafka, Redis Pub/Sub)
  
• Proficiency in asynchronous programming patterns (Promises, async/await, event emitters)
  
• Strong knowledge of authentication/authorization mechanisms (JWT, OAuth 2.0, session management)
  
• Experience with API gateway patterns and service discovery

Microservices Expertise

• Proven track record of decomposing monolithic applications into microservices
  
• Experience with service communication patterns (synchronous and asynchronous)
  
• Understanding of distributed systems challenges (CAP theorem, eventual consistency, circuit breakers)
  
• Knowledge of Domain-Driven Design (DDD) principles
  
• Experience implementing saga patterns for distributed transactions

Development Practices

• Strong understanding of design patterns and SOLID principles
  
• Experience with Test-Driven Development (TDD) using Jest, Mocha, or similar frameworks
  
• Proficiency with version control systems (Git) and branching strategies
  
• Experience with code review processes and maintaining code quality standards
  
• Knowledge of performance optimization and profiling tools

Security & Compliance

• Experience with PCI-DSS compliance requirements and implementation
  
• Knowledge of encryption standards and secure coding practices
  
• Understanding of OWASP Top 10 vulnerabilities and mitigation strategies
  
• Experience implementing security measures for PII data protection

DevOps & Infrastructure

• Experience with containerization (Docker) and orchestration (Kubernetes, Docker Swarm)
  
• Familiarity with cloud platforms (AWS, GCP, or Azure)
  
• Knowledge of CI/CD tools (Jenkins, GitLab CI, GitHub Actions)
  
• Experience with monitoring and logging solutions

Preferred Qualifications

• Experience with payment gateway integrations (Stripe, PayPal, or similar processors)
  
• Knowledge of POS systems or retail/hospitality industry domains
  
• Experience with GraphQL and modern API paradigms
  
• Familiarity with TypeScript for type-safe Node.js development
  
• Experience with serverless architectures (AWS Lambda, Cloud Functions)
  
• Understanding of CQRS and Event Sourcing patterns
  
• Experience with Redis for caching and session management
  
• Knowledge of gRPC for inter-service communication
  
• Experience with real-time features using WebSockets or Server-Sent Events
  
• Contributions to open-source projects

Soft Skills

• Excellent problem-solving and analytical thinking abilities
  
• Strong communication skills to collaborate with cross-functional teams
  
• Ability to mentor junior developers and conduct technical reviews
  
• Self-motivated with ability to work independently and in team environments
  
• Adaptability to learn new technologies and frameworks quickly
  
• Strong attention to detail and commitment to code quality