W2 Senior Backend Engineer – (Payments Domain)

Job Title: Senior Backend Engineer (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 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 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.