Contractor Senior Java Developer

• Focus on creating secure, scalable, and high-performance services using Java and Spring Boot.
• Demands deep technical expertise, clean system design, and close collaboration with product and engineering teams.

• Collaborate with Tech Leads to design and implement backend services for real-time payment authorization, capture, refund, and settlement processes.
• Build resilient Java Spring Boot microservices, focused on domain isolation, transactional integrity, and fault tolerance.
• Develop and evolve payment gateway integrations, optimizing for latency, observability, and extensibility.
• Ensure backend systems adhere to industry standards for security (e.g., PCI-DSS) and data compliance.
• Architect and deliver secure RESTful APIs, optimized for high throughput and external integrations.
• Collaborate on webhook and callback handling strategies for asynchronous payment flows.
• Contribute to the design of CI/CD pipelines and infrastructure-as-code practices.
• Implement robust observability and alerting frameworks (metrics, logging, tracing) across all services.
• Take proactive measures for performance tuning, stress testing, and load forecasting.
• Establish and uphold strong unit, integration, and contract testing disciplines across services.
• Spearhead secure-by-default coding practices.
• Participate in code reviews, pairing, and knowledge sharing.
• Take a senior role in cross-functional collaboration with Product, Compliance, and Infrastructure teams.
• Be responsive to live payment issues, partnering with support and SRE teams.

• 8+ years of backend engineering experience, including at least 2+ years in payments, fintech, or transaction-intensive systems.
• Strong command of Java and Spring Boot.
• Experience working with payment gateways.
• Deep understanding of RESTful APIs, HTTP semantics, and secure system design.
• Proficiency in Git with branching, merging, and pull request workflows.
• Familiarity with agile product development and working in domain-driven teams.

• Knowledge of payment lifecycle concepts.
• Experience with Docker and container orchestration (e.g., Kubernetes).
• Familiarity with NoSQL databases (MongoDB, Cassandra) and event-driven architectures (Kafka, RabbitMQ).
• Hands-on experience with CI/CD pipelines (e.g., GitLab CI, Jenkins).
• Strong grasp of software security fundamentals.
• Excellent communicator who thrives in collaborative and fast-paced environments.

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