Senior Backend Engineer PHP High-Volume Systems Expert

Sharawan Kumar

Senior Backend Engineer PHP High-Scale Systems Performance & Reliability

Noida, India mailto:**********@*****.*** 933-***-**** LinkedIn Professional Summary

Senior Backend Engineer with 14+ years of experience designing and building scalable, high-performance web applications across hospitality, e-commerce, healthcare, and CRM domains. Expert in PHP (Zend/Laravel), system optimization, distributed integrations, and production reliability. Proven track record of improving performance, stability, and scalability of mission-critical systems. Strong background in payment systems, high-volume data processing, and accessibility (WCAG 2.1 AA).

Core Technical Skills

Backend: PHP (Zend, Laravel), Node.js, REST APIs, WebSockets Databases: MySQL, MongoDB, Redis

Frontend: Angular, JavaScript (ES6+), TypeScript, HTML5, CSS3 CMS & Platforms: WordPress, Magento, Shopify, OpenCart, NationBuilder Performance & Reliability: Caching, Background Jobs, Query Optimization, Fault Tolerance, RCA

Security: JWT, OAuth, Role-Based Access, Input Validation, CSRF Protection Payments: PayPal, Stripe, Razorpay, CCAvenue, CyberSource, 2C2P, Westpac, AirPay, Geidea DevOps & Tools: Git, Jenkins, ELK Stack, SQS, SES, Postman, Jira, SonarQube Accessibility: WCAG 2.1 AA Compliance, Screen Reader Support, Keyboard Navigation Professional Experience

Senior Software Engineer / Team Lead – Backend

Hotelogix Pvt. Ltd. – Noida, India Aug 2022 – Dec 2025

● Led backend development for a cloud-based Hotel Property Management System

(PMS) used by hotels in 100+ countries, supporting high-availability and high-transaction workloads.

● Optimized high-volume reporting module (5M+ records) using table partitioning, indexing, and query refactoring, reducing memory usage by 40% and improving load times by 60%.

● Designed and implemented fault-tolerant payment processing architecture with centralized gateway handling and retry mechanisms, improving transaction success rate by 25%.

● Built asynchronous background job processing for long-running operations (reports, OTA sync, invoice processing), significantly improving UI responsiveness and system stability.

● Developed and maintained RESTful APIs for order management, inventory updates, invoicing, POS integration, and kitchen order tickets.

● Integrated WebSockets, Node.js, and MongoDB to enable real-time updates for front-desk operations and dashboards.

● Led production incident response and root cause analysis (RCA) using ELK stack and Redis monitoring to diagnose issues and reduce recurring incidents.

● Implemented JWT-based authentication and role-based authorization, securing access across multiple business modules.

● Designed and maintained database schemas and functional requirement specifications

(FRS) for complex hospitality workflows.

● Built a common webhook framework to reliably process third-party callbacks and persist external system responses.

● Implemented E-invoicing integrations (Cygnet, Zanzibar, Tanzania, Saudi Arabia) with automated retry and reconciliation mechanisms.

● Improved dashboard performance and user experience by optimizing queries, reducing payload sizes, and implementing efficient data aggregation.

● Collaborated with infrastructure teams to address scaling challenges, performance bottlenecks, and reliability risks in production systems.

● Mentored junior engineers, conducted code reviews, and enforced clean code and architectural standards across the backend team.

Tech Stack: PHP (Zend), Node.js, MySQL, MongoDB, Redis, WebSockets, SQS, SES, ELK Stack, Git, Jenkins

Software Engineer – Backend

BAMKO India Pvt. Ltd. – Dehradun, India Dec 2018 – Jul 2022

● Architected and implemented custom e-commerce and CRM platforms in Core PHP & MySQL for US-based clients, integrating payments, inventory, and third-party APIs.

● Built SAP integrations (SOAP APIs) for product pricing, order creation, order tracking, and credit synchronization.

● Designed cron-based synchronization pipelines to sync inventory, pricing, and loyalty points from SAP to application databases.

● Developed tools for payroll processing, invoice management, and user validation across multiple business units.

● Created a unified Laravel-based platform for 60+ stores, consolidating sales reports, inventory, and invoicing into a single dashboard.

● Implemented data pipelines from MySQL to BigQuery to support large-scale reporting and analytics.

● Integrated UPS shipping APIs for real-time shipment tracking.

● Built asynchronous background jobs for email alerts and long-running processing tasks.

● Implemented WCAG 2.1 AA accessibility standards across UI flows, improving compliance and usability for users with disabilities.

● Resolved production issues on priority basis, performed RCA, and delivered permanent fixes to prevent recurrence.

Tech Stack: Core PHP, Laravel, MySQL, SAP SOAP APIs, Cron Jobs, BigQuery Full Stack Developer

Codeable Technologies Pvt. Ltd. – Lucknow, India Jan 2014 – Dec 2018

● Delivered 50+ custom web applications for Australian clients across e-commerce, healthcare, and education domains.

● Developed custom WordPress themes, plugins, and child themes, extending functionality using actions and filters.

● Built e-commerce platforms from scratch using Magento 2, Shopify, and WooCommerce.

● Designed and developed REST APIs in Laravel for Ionic mobile applications.

● Implemented secure authentication systems using JWT, OAuth, and role-based access control.

● Integrated multiple payment gateways and third-party APIs (HubSpot, Microsoft Dynamics, Salesforce, Mailchimp, Vonage).

● Improved page load performance by up to 40% using caching, query optimization, asset minification, CDN integration, and background processing.

● Implemented comprehensive application security practices including CSRF protection, input validation, rate limiting, CAPTCHA, and encrypted data storage.

● Solved real-time production issues on client servers, ensuring high availability and stability.

Tech Stack: PHP, WordPress, Laravel, Angular, Magento, Shopify, OpenCart, MySQL, Ionic Web Developer

NYC Design Studio – Lucknow, India Nov 2011 – Jan 2014

● Delivered 20+ end-to-end e-commerce solutions using WordPress and Core PHP, improving page load performance and conversion rates.

● Developed custom themes, plugins, membership systems, and role-based access controls.

● Integrated payment gateways, CRM forms, and inventory modules.

● Built multilingual websites using WPML.

● Implemented security best practices including CAPTCHA, login attempt limits, backups, and plugin hardening.

Tech Stack: WordPress, PHP, MySQL, jQuery, JavaScript Key Projects

Hotelogix – Cloud-Based Property Management System High-scale hospitality platform managing front desk, POS, housekeeping, OTA integrations, and distribution systems for hotels in 100+ countries. BAMKO HPI

Unified multi-store inventory and order management system integrated with SAP and UPS. DNSW Diabetes (Australia)

Healthcare platform with user registration, donation management, newsletters, and webinar support.

Education

Bachelor of Computer Applications (BCA) – Sikkim Manipal University 2008 – 2011 Intermediate & High School – U.P. Board 2005, 2003

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