W2 - Senior Backend Engineer Node.js (Payments Domain)

Job Title: Senior Backend Engineer Node.js (Payments Domain)

Location: Johnston, New Jersey (Onsite)

Employment Type: Contract (W2)

Open Positions: 3

Start Date: Immediate

We are seeking experienced Senior Backend Engineers with strong Node.js expertise and hands-on experience in the Payments domain. The ideal candidate will have a proven track record of designing and developing scalable payment APIs, transaction processing systems, and microservices in a cloud-native environment.

• 5+ years of backend development experience using Node.js and TypeScript
• Strong experience designing and building payment APIs and microservices
• Hands-on experience integrating payment gateways such as Stripe, PayPal, Braintree, or similar platforms
• Deep understanding of payment standards including PCI-DSS, PSD2, and ISO 8583
• Experience with transaction processing, reconciliation, and settlement workflows
• Strong knowledge of payment security concepts including tokenization, encryption, and fraud detection
• Experience working with PostgreSQL, MongoDB, and Redis
• Hands-on experience with AWS services including EC2, Lambda, S3, RDS, and SQS
• Daily hands-on usage of AI-assisted coding tools such as GitHub Copilot, Cursor, or Claude Code (Mandatory)

• Experience with digital wallets and card network integrations (Visa, Mastercard)
• Knowledge of chargeback handling and dispute management processes
• Experience working in high-volume payment processing environments
• Strong problem-solving and system design skills

• Design, develop, and maintain scalable backend services and APIs
• Build secure and compliant payment processing solutions
• Integrate with payment gateways and financial systems
• Optimize application performance, reliability, and scalability
• Collaborate with product, architecture, and engineering teams
• Implement best practices for security, testing, and deployment
• Leverage AI coding tools to improve development efficiency and code quality

Open to candidates authorized to work on W2.