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Hüseyn Zülfüqarov

@hseynzlfqarov

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I build secure Java backend systems with Spring Boot, REST APIs, Redis, and AI integrations.

Azerbaijan

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What I'm looking for

I'm looking to build secure, scalable Java backend systems where I can deepen my Spring Boot, API design, testing, cloud, and system-design experience.

I've built backend systems for AZAL - Azerbaijan Airlines, including VIBE STORE, SKYFLOW, and an Airport Distance Service.

I develop secure Spring Boot APIs with JWT authentication, Google OAuth, Redis caching, rate limiting, database migrations, and resilient external integrations. My work includes retail payroll logic, crew and flight management, real-time WebSocket notifications, and AI-powered document and database queries using Spring AI and Gemini.

Previously, I contributed to NEXUS Team's digital retail platform for the OBA SID Competition, designing database schemas for inventory, transactions, feedback, and bonus logic. I write clean, testable Java code using JUnit and Mockito and work with Docker, GitHub Actions, PostgreSQL, MySQL, and Git.

Experience

Work history, roles, and key accomplishments

Backend Developer Intern

Azerbaijan Airlines (AZAL)

Feb 2026 - Jun 2026 (4 months)

Developed three backend systems including a retail platform with an AI assistant, a crew and flight management system, and an external API integration service.

Java 21+Spring Boot 4 Spring AI ONNX Embeddings MySQL Redis Resilience4j Bucket4j Docker PostgreSQL WebSockets STOMP Flyway Spring Security JWT WebClient

Backend Developer Intern

AZAL - Azerbaijan Airlines

Feb 2026 - Jun 2026 (4 months)

Designed and built backend systems and services from scratch:

VIBE STORE - Retail Management Platform
• Developed a REST API for multi-store retail management, handling store structures, employee lifecycles, and sales tracking.
• Built a flexible payroll engine that calculates proportional salaries based on worked days and handles complex bonus rules (fixed, percentage, tiered).
• Integrated Spri

Backend Developer

NEXUS Team

Oct 2025 - Feb 2026 (4 months)

Contributed to the backend of a full-scale digital retail platform built by a development team for the OBA SID Competition. The app features QR-based Scan-and-Go checkout, real-time price checker, a behavior- driven discount system, AI-powered product health analysis, an AI Chef recipe generator, a comprehensive admin panel, and purchase behavior analytics. Designed and implemented database schema

Java 21+Spring Boot Spring Security PostgreSQL WebSockets Gemini API