Abduhafiz Kayumov

- Integrated Twilio (SMS), ZeroBounce (email validation), and WhatsApp API for client chatbot - Boosted platform performance by ~10% via PHP refactoring and PostgreSQL query tuning - Refactored image resizing and added Redis-backed queues for stability under load - Built REST API (Laravel) with Vue.js interfaces. Set up Sentry for error tracking and CI/CD with Docker - Used Redis for caching and async jobs. Tech Stack: PHP, Laravel, JavaScript, Vue.js, PostgreSQL, REST APIs, Docker, Redis, CI/CD, Sentry

- Maintained and optimized microservices architecture for a SaaS platform managing corporate travel - Integrated third-party APIs to sync employee expense data - Developed REST APIs for a Vue.js + TypeScript frontend - Supported and improved legacy PHP/Laravel modules - Optimized MS SQL Server performance via complex queries and stored procedures - Used Git and CI/CD for version control and deployment Tech Stack: PHP, Laravel, Python, JS, Vue.js, MS SQL Server, Third-party Integrations, REST APIs, Git

- Led a team of 4 in building a SaaS platform for corporate gifting with 5000+ users, ensuring quality and timely delivery - Set up workflows and mentored on Laravel, Vue.js, and API best practices - Integrated Apple Pay and Amazon Pay, handling 1000+ monthly transactions securely - Boosted API speed 3x and cut page load time by 60% via MySQL tuning, Memcached, queue jobs, and refactoring Tech Stack: PHP, Laravel, JS, Vue.js, MySQL, Memcached, 3rd-party integrations, Queues, REST API, Google Apps Script

• Built a system for collecting grocery market prices across Tajikistan and Kyrgyzstan, managing a database of 10M+ records • Designed and implemented web apps (from scratch and in existing projects) supported by United Nations Development Program, World Bank, Helvetas (Switzerland) and GIZ (Germany) • Developed APIs for 10+ mobile apps, supporting 250,000+ downloads Tech Stack: PHP, JS, Laravel, MySQL, SQLite, REST APIs, Bootstrap, Java, Kotlin, Framework7, Third-party Integrations, Nginx, Git, HTML/CSS

• Automated currency transaction reporting, slashing processing time by 75% (from 8 hours to 2 hours), freeing 20+ hours weekly for analytics • Developed a warehouse accounting tool with barcode integration Tech Stack: PHP, MySQL, JS, C#, MS SQL Server, Apache, HTML/CSS, jQuery

• Built a tool that cut report generation time by 60% (from 5 hours to 2 hours), saving 100+ hours annually • Contributed to database updater and resource allocation tools, improving team efficiency by 20% Tech Stack: PHP, JS, C#, MySQL, HTML/CSS, jQuery, SVN

- Developed tool that parses base station logs and generates reports using VBA and MS SQL Server. Tech Stack: Visual Basic for Applications, MS SQL Server, Macros