Kabir Man Singh — Java Backend Developer in Kathmandu, Nepal

Varosa Technology

Anamnagar, Kathmandu

• Spring Boot
• RabbitMQ
• PostgreSQL
• Liquibase
• OAuth2
• LLM Integration

• Designed and implemented core database schemas, ensuring zero-downtime migrations across environments for high-traffic platforms.
• Built and optimized RESTful APIs and RabbitMQ message queues supporting long-running tasks and workflow operations for 100K+ total users.
• Improved backend response times through query optimization using CTEs and materialized views, along with service-layer refactoring, resulting in measurable reductions in API latency.
• Designed and maintained high-performance REST APIs powering core business logic, with database schemas optimized using MyBatis and Query Builder, and all schema versioning managed via Liquibase.
• Built asynchronous notification and transactional email pipelines using RabbitMQ, integrating Firebase for event-driven push notifications and AWS SES/SMTP for reliable transactional email delivery.
• Integrated Google OAuth2 and Apple OAuth2 login, enabling secure and frictionless third-party authentication for end users.
• Contributed to an AI-powered CV builder feature, developing backend logic for LLM-based CV content generation, including prompt engineering, response parsing, and API integration.
• Collaborated closely with frontend, QA, and DevOps teams to deliver reliable, maintainable backend architecture aligned with government system requirements.

Coderuple Technology

Sanepa, Lalitpur

• Spring Boot
• RabbitMQ
• Flutter
• Liquibase
• eSewa
• Firebase

• Designed scalable database schemas from the ground up with Liquibase, ensuring safe and reversible migrations in a production environment.
• Built resilient Spring Boot microservices leveraging the SAGA pattern using RabbitMQ for interservice communication.
• Resolved complex bugs and scheduling issues to ensure high data consistency and stability.
• Developed a full Flutter mobile application with eSewa payment gateway integration, navigating complex payment flow requirements.
• Implemented biometric authentication (fingerprint and facial recognition) in the Flutter app, significantly enhancing user account security.
• Boosted mobile app performance using Hive-based caching strategies and implemented dynamic feature flags via Firebase Remote Config.
• Successfully delivered a comprehensive full-stack solution encompassing both backend APIs and mobile UI, leveraging close cross-functional teamwork to meet all project milestones on schedule.

F1Soft International Pvt. Ltd.

Pulchowk, Lalitpur

• Flutter
• Firebase
• Riverpod
• Hive

• Developed and maintained cross-platform Android apps using Flutter, integrating APIs and Firebase services (Authentication, Remote Config) with efficient state management using Riverpod.
• Optimized app performance through caching strategies with Hive and implemented dynamic feature management via Firebase Remote Config.
• Collaborated in Agile teams, participating in sprint planning, code reviews, and feature development.