Senior Java Backend Developer - Part-Time

Candidate should have strong hands-on experience in Java Backend Development (Java + Spring Boot) with exposure to financial services, banking, payments, or transaction processing platforms.

This role requires candidates who are comfortable working on enterprise-grade backend applications, supporting secure and highly available systems, and contributing to system enhancements, integrations, and modernization initiatives.

Relevant payment-related platforms is required ( any).

• International payment transactions
• Payment gateway integrations
• Card payment ecosystems (Visa, Mastercard, Amex, UPI)
• Backend services supporting payment processing
• Migration initiatives towards modern platforms and cloud environments

Mandatory Skills

Java Backend Development – Strong hands-on experience developing enterprise backend applications using Java. Candidate should have experience building scalable, reliable, and maintainable backend services.

Spring Boot Framework – Strong experience developing REST APIs, microservices, backend services, and enterprise applications using Spring Boot.

Financial Services Experience – Experience working within Banking, Payments, Insurance, FinTech, or other regulated financial environments. Candidate should understand enterprise systems requiring security, stability, and high transaction volumes.

Payment Systems / Transaction Processing – Experience supporting payment platforms, payment gateways, payment processing systems, switching platforms, or financial transaction applications.

International Payment Schemes – Exposure to payment ecosystems involving Visa, Mastercard, Amex, UPI, or similar card/payment networks.

Backend API Development & Integration – Experience developing and integrating backend APIs, REST services, and enterprise system integrations with internal/external platforms.

Linux Server Environment – Strong experience developing, deploying, troubleshooting, and supporting applications running on Linux environments (RHEL preferred).

Windows OS Environment – Experience supporting enterprise applications deployed or integrated within Windows environments.

AWS Cloud Exposure – Experience working with AWS Cloud environments, including application deployment, migration, monitoring, or cloud-based development activities. Cloud migration experience is an advantage.

Python Scripting – Experience using Python scripting for automation, operational support, integration, or application enhancement activities.

Korn Shell Scripting – Experience writing and maintaining shell scripts in Linux environments for automation and operational activities.

PostgreSQL Database – Experience working with PostgreSQL including SQL development, backend integration, query optimization, and database troubleshooting.

Payment Security & Compliance – Understanding of PCI-DSS standards, payment security controls, and card industry requirements.

System Migration & Modernisation – Experience supporting application migration, platform upgrades, or modernization initiatives from legacy environments to newer platforms/cloud.

Software Development Lifecycle (SDLC) – Experience contributing across requirement analysis, technical design, development, testing, deployment, and production support activities.

Technical Documentation – Ability to prepare technical documentation including solution designs, integration flows, technical specifications, and support documentation.

Stakeholder Collaboration – Ability to work with technical leads, QA teams, business users, vendors, banks, and external partners.