Java Developer_AppInventis

Key Responsibilities
- Design, develop, and maintain backend services and APIs using Java and Spring Boot.
- Build, integrate, and optimize payment gateway and payment processor workflows, including
authorization, capture, settlement, refunds, chargebacks, and reconciliation.
- Own payment processing logic, ensuring accuracy, security, and compliance (PCI-DSS
awareness).
- Design and optimize MySQL database schemas, queries, and transactions for high-throughput
payment data.
- Implement caching strategies using Redis to improve system performance and reduce latency.
- Build and maintain message queue-based asynchronous processing for reliable transaction
handling.
- Collaborate cross-functionally with Product, QA, DevOps, and Frontend teams to deliver features
within agreed timelines and sprint commitments.
- Troubleshoot and resolve production issues related to payment transactions, prioritizing reliability
and data integrity.
- Deliver clean, well-documented, and testable code adhering to engineering standards.
- Participate in code reviews, architecture discussions, and sprint ceremonies.
- Provide regular progress updates and deliverable tracking as required.
Required Qualifications & Skills
Experience
- 6-8 years of hands-on backend development experience in Java.
- Strong, demonstrable experience building and scaling payment processing systems.
- Extensive hands-on work with payment gateway and payment processor integrations.
Technical Skills
- Strong proficiency in Java (8/11) and Spring Boot (REST APIs, microservices architecture).
- Solid experience with MySQL - schema design, query optimization, and transaction management.
- Hands-on experience with Redis for caching and performance optimization.
- Experience with message queuing systems (e.g., Kafka, RabbitMQ, ActiveMQ).
- Deep understanding of the payment transaction lifecycle: authorization, capture, void, refund,
settlement, and reconciliation.
- Working knowledge of PCI-DSS fundamentals, tokenization, and encryption practices.
- Experience with Git and CI/CD pipelines.
Preferred Skills
- Hands-on experience with the P97 payment processor.
- Hands-on experience with the Fiserv Datacap payment processing platform.
- Exposure to fuel, retail, or POS payment ecosystems.
- Familiarity with containerization (Docker/Kubernetes) and cloud platforms (AWS/Azure/GCP).
Soft Skills
- Ability to ramp up quickly and work independently within a defined scope and timeline.
- Strong communicator, comfortable working with distributed and/or client-facing teams.
- Detail-oriented, with a strong sense of accountability for deliverables under contract terms.
- Adaptable to changing priorities within project/client constraints.

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