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Kishan Singh

@kishansingh5

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Senior software engineer building scalable full-stack web apps with PHP, React, and microservices.

India

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What I'm looking for

I’m looking for a team where I can own products end-to-end—from architecture and APIs to zero-downtime deployments—while building scalable full-stack systems, improving performance, and integrating reliable third-party services.

I’m a results-driven Senior Software Engineer with 5+ years building and scaling full-stack web applications across PHP (Laravel, CodeIgniter), JavaScript/TypeScript (React.js, Node.js), and Python. I focus on high-performance systems and dependable backends—using PostgreSQL, MySQL, and Redis—while delivering clean REST API design, microservices architecture, and production-ready integrations.

In my recent work, I’ve owned end-to-end delivery with zero-downtime deployments, refactoring critical legacy components for a 99.8% performance gain and unblocking production workflows that were impacting all users. I also build high-throughput pipelines (10,000+ leads per run with queue-based Twilio + cron) and integrate multiple payment gateways (Razorpay, PhonePe, Cashfree, PayU) with dynamic routing, while leveraging AI tools like GitHub Copilot, Claude, ChatGPT, and Ollama to accelerate delivery and improve system understanding.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Development Engineer

Current

Innostax Software Labs Pvt. Ltd.

Oct 2025 - Present (9 months)

Owned a business-critical SugarCRM v6.5 production ecosystem for banking clients, managing stability, new features, and zero-downtime deployments end-to-end. Cleared a 12+ month production bug backlog, including a Froala Editor integration failure, and integrated AI-powered Review Forms across realwired.com subdomains.

SugarCRM Froala Editor Git Flow Zero Downtime Deployments Root Cause Analysis AI Tools: Claude ChatGpt Ollama

Software Developer

Goolean Technologies Pvt. Ltd.

Aug 2024 - Oct 2025 (1 year 2 months)

Mentored senior developers and interns on FastAPI and React.js and led a modernization pilot migrating a PHP monolith to microservices. Built and delivered the Oyly REST API backend using CodeIgniter 3 with real-time order sync and developed the Clocktales HRMS from scratch, including payment gateway integrations.

Phone Pe fastAPI React Microservices PHP CodeIgniter REST APIs PhonePe Cashfree PayU ChatGpt

Junior Software Developer

Nablasol Digital Service Pvt. Ltd.

Aug 2022 - Jul 2024 (1 year 11 months)

Built and launched a Microsoft Teams Connector for SugarCRM using the Microsoft Graph API to automate meeting lifecycle events (creation, invites, reminders) for US legal clients. Engineered a high-volume SMS campaign system using Twilio + CodeIgniter with a cron-based queue architecture to process 10,000+ leads per run without timeouts.

Microsoft Graph SugarCRM PHP CodeIgniter Twilio

Software Developer (Intern)

Nablasol Digital Service Pvt. Ltd.

Aug 2021 - Aug 2022 (1 year)

Improved production performance in SugarCRM by refactoring raw SQL loops into optimized SugarBean queries, reducing execution time from 22s to 0.044s (99.8% gain). Developed custom SugarCRM modules and enhanced core modules using Backbone.js and PHP, adding structured error handling to prevent production crashes.

SugarCRM SugarBean Queries SQL Optimization PHP Backbone.Js Error Handling Custom Module Development

Web Developer (Intern)

Achiever Solutions Pvt. Ltd.

Feb 2021 - Jul 2021 (5 months)

Built full-stack applications using Core PHP 7 and MySQL, including custom admin panels, CRUD operations, and optimized SQL queries for improved database performance. Implemented AJAX and JavaScript for real-time content updates across client websites.

PHP MySQL CRUD SQL Optimization AJAX JavaScript Real Time Updates