Khachatur Melkonyan

• Developed Automatic Complex of Communication (ACC) with custom TCP/IP-based protocol. • Visualized through Qt/QML • Implemented scalable network modules supporting unlimited nodes and optimal routing. • Created database registration modules using DAO technology and PostgreSQL. • Built dispatcher and handler modules for remote control and event tracking.

• Tested chip analysis programs and reported defect findings. • Developed test cases and automated testing tools to streamline QA processes, interfaces through Qt/QML • Generated raw data for main programs through custom testing applications.

• Designed a custom fast search database (Sapphire) with optimized data storage algorithms. • Implemented SB-tree structures for approximate term search with error tolerance. • Built balanced tree indexes for efficient exact-term search using STL, Boost and thread pools.

• Researched and evaluated search engines including Xapian, Sphinx, Lucene, and MongoDB. • Implemented pilot projects to validate search engine concepts and prototypes. • Refactored and optimized the Sapphire search engine for improved performance. • Developed new search solutions using MongoDB and POCO libraries.

• Developed POS terminal software with Atos Worldline platforms. • Engineered embedded C applications for financial transaction processing • Built real-time embedded systems for POS terminals with strict timing constraints. • Implemented NFC contactless payment engines for American Express cards. • Designed secure transaction flows and dispatchers communicating with contactless kernels. • Integrated EMV kernels and ensured compliance with industry standards.

• Optimized payment system latency through branchless code, SIMD vectorization, NUMA-aware core pinning, DPDK, and CPU power state management. • Implemented a scalable load balancer to distribute high-frequency traffic across backend servers efficiently. • Developed a high-performance OOP-based application server for processing real-time financial transactions. • Engineered embedded POS terminal applications using Atos Worldline platforms and conducted EMV payment authorization (Visa, MasterCard, EuroPay). • Developed low-latency modules in pure C for embedded environments. • Wrote highly optimized C code for POS terminals and real-time transaction systems. • Integrated POS systems with tax authority reporting interfaces and external cash registers via VIC and CTEP protocols. • Managed transaction data storage, retrieval, and updates in MySQL databases.

• Architected and implemented audio streaming modules for real-time communication applications. • Developed a high-frequency audio receiver using OOP principles for efficient and maintainable code. • Engineered adaptive codec and protocol switching based on network quality.