• Lead backend development with Java and Spring Boot for a microservice-based platform supporting payment processing, currency exchange, OTC, and crypto-related operations.

• Software architecture and system design decisions across microservices, distributed workflows, REST APIs, integration boundaries, and shared backend components.

• Built a configurable payment orchestration engine supporting pay-in, pay-out, and cross-flow transactions with multi-step execution, request validation, compliance checks, payment intent creation, provider processing, callbacks, and transaction status management.

• Designed a provider-agnostic integration architecture for payment systems and third-party providers, including reusable request mapping, payment intent, webhook, callback, and configuration components.

• Designed and implemented exchange quote and deal workflows, including rate fixation, expiration management, validation, approval, treasury-related states, and transaction linkage.

• Designed PostgreSQL data models and JPA repositories for payment flows, step transactions, provider mappings, exchange quotes, deals, settlement schedules, and transaction history.

• Implemented Redis-based settlement stage tracking, TTL-driven processing, distributed locking, callback waiting, controlled flow interruption, failure propagation, and transaction state synchronization.

• Contributed to backend architecture and transaction workflows for crypto-related payment operations.

• Drive technical decision-making, code reviews, database design, performance optimization, and improvements to the reliability, maintainability, and scalability of backend services.

• Support unit, integration, and end-to-end testing, deployment, monitoring, production troubleshooting, and hotfix delivery.

• Experienced in backend development using Java (8–21), Spring Boot, Hibernate, REST/gRPC/GraphQL APIs, Kafka, Redis, and AWS services.
• Built scalable microservices and monolithic applications for web and mobile platforms, including architecture design and performance tuning.
• Led small teams, coordinated development processes, created documentation (C4, sequence diagrams), and supported testing and deployment.
• Worked on integrations with third-party APIs, AI tools (TensorFlow), and authentication systems (OAuth2, JWT, Firebase).
• Used CI/CD tools, monitoring (Grafana, Prometheus), and logging (ELK) to ensure system reliability and maintainability.

• Optimized and scaled product business logic for improved stability and performance.
• Refactored legacy code using best practices to enhance maintainability.
• Developed and enhanced REST APIs and UI forms.
• Optimized database structure to support new features and improve performance.
• Designed and implemented end-to-end automated testing.
• Built a demo Android mobile app from scratch, including business logic and UI.
• Integrated AI-driven features using the ChatGPT API.

• Developed and integrated various modules in microservice and monolithic architectures.
• Refactored legacy projects to improve performance and maintainability.
• Wrote unit and functional tests to ensure software quality and reliability.