About
Java Backend Developer with 2 plus years of hands-on experience designing and building scalable, high-availability backend systems in the travel and booking domain. Proficient in Spring Boot, Spring Cloud, Microservices architecture, RESTful API design, Feign Client-based inter-service communication, MySQL schema design, and OAuth 2.0 security. Architected a 30 plus table relational database schema covering booking, user authentication, payment, and order domains. Demonstrated track record of reducing API response times by 20 to 30 percent, implementing idempotency patterns for data integrity, and integrating third-party APIs with robust error handling and response normalization. Currently expanding expertise in AWS (Amazon Web Services), Docker, Kubernetes, Redis, CI/CD pipelines, and AI/LLM API integrations to transition into cloud-native and AI-integrated backend engineering roles.
Skills & Expertise (37)
Work Experience
Java Backend Developer
Ruzinn Technology Pvt Ltd
Sep 2024 - Apr 2026
Designed and implemented an end-to-end booking platform using Spring Boot covering cart management, service processing, third-party provider API calls, and internal response mapping. Architected a 30 plus table relational MySQL schema covering booking entities, user profiles, authentication records, payment details, pricing rules, and order management - normalized to Third Normal Form (3NF) with foreign key constraints and composite indexing strategies for referential integrity and query performance. Reduced average API response time by 20 to 30 percent through targeted MySQL query optimization using EXPLAIN plans, composite indexes, and query restructuring - measurably improving system throughput and user experience. Built an inter-service communication layer using Feign Client (Spring Cloud OpenFeign), eliminating boilerplate REST code and improving maintainability across the microservices ecosystem. Designed an idempotency tracking table to record processed request keys, eliminating 100 percent of duplicate booking entries and guaranteeing exactly-once processing semantics. Integrated Zoho Books API to automate Sales Order and Purchase Order creation with dynamic JSON payload construction and correct line_items field mapping (item_id, quantity, rate). Diagnosed and resolved a critical production pricing bug in Zoho Books integration - identified incorrect field usage (bcy_rate vs rate), preventing revenue loss and restoring accurate financial order creation. Implemented OAuth 2.0 authentication with token refresh handling and stored Zoho order IDs for end-to-end financial tracking and reconciliation. Managed multi-step database transactions across cart, order, and payment tables using Spring transaction management - ensuring atomicity and referential integrity in complex booking workflows. Maintained zero critical production downtime across entire 18-month tenure through proactive monitoring, debugging, and rapid production support. Collaborated with frontend teams on API contracts and integration testing; participated in Agile sprint planning, peer code reviews, and debugging sessions.
Education
B.E. - Electronics and Communication Engineering - Mailam Engineering College
2019 - 2023 · Afghanistan
Certifications
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Citizen
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Open to Relocation
Skills (37)
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