Open to Engineering Lead opportunities

I'm a

Kumaresan Rajendran

Engineering lead with 13+ years in CRM and travel technology platforms, combining hands-on PHP-Laravel engineering, API-first system design, performance optimization, and team leadership.

About Me

I build enterprise products where workflow, reliability, and delivery speed matter.

My strongest work is in integration-heavy platforms: CRM modules, travel booking engines, airline APIs, payment gateways, ERP and mail platform sync, and custom workflow automation.

I stay close to the code while leading teams through architecture, sprint planning, code reviews, stakeholder communication, CI/CD practices, and measurable performance improvements.

What I Do

Full-stack engineering leadership for SaaS and travel technology platforms.

Backend Architecture

Laravel, PHP, CodeIgniter, Node.js, REST APIs, microservices, modular architecture, and server-side rendering.

Frontend Product Delivery

Vue.js, Nuxt.js, React.js, JavaScript, jQuery, HTML, CSS, and practical UI delivery for operational systems.

Cloud and DevOps

CI/CD pipelines, Jenkins, Docker, AWS EC2/S3/RDS, Azure AI Services, IIS, Apache, Nginx, Redis, and Git workflows.

AI-Assisted Engineering

Practical use of Claude, Cursor, and Codex for code review, refactoring, documentation, debugging, and faster implementation planning.

Tech Stack

Technologies I use to build, lead, and ship.

Backend
  • Laravel
  • PHP
  • Yii
  • CodeIgniter
  • Node.js
  • REST APIs
  • Microservices
Frontend
  • Vue.js
  • Nuxt.js
  • React.js
  • JavaScript
  • jQuery
  • HTML
  • CSS
Cloud & DevOps
  • AWS EC2/S3/RDS
  • Docker
  • Jenkins
  • CI/CD
  • Redis
  • Nginx
  • Apache
  • IIS
Database
  • MySQL
  • Redis
  • SQL Server
AI & Tools
  • Claude
  • Cursor
  • Codex
  • Azure AI Services
  • Git
  • Jira

Work Experience

13+ years across CRM SaaS, travel platforms, booking systems, and product delivery.

May 2024 - Present Chennai

Lead Professional

vThink Global Technologies Pvt. Ltd.

Leading Whitecup CRM architecture and enhancement for a multi-tenant enterprise SaaS platform used by 20+ US clients. Built workflow automation, dynamic RBAC structures, REST integrations, and PHP-Yii performance improvements.

Feb 2018 - Apr 2024 Chennai

Technical Project Manager

ClarityTTS

Directed architecture and full SDLC for ClarityIBE, ClarityNDC, and ClarityGTS, travel platforms processing 5M+ monthly API calls. Led 8 engineers and reduced release cycles from 2 weeks to 3 days.

May 2016 - Jan 2018 Chennai

Senior Software Engineer

Distributed Software Solutions

Engineered B2B and B2C booking systems for flights, hotels, and vacation packages, plus middleware APIs and supplier connector bridges that reduced integration timelines by 30%.

May 2014 - May 2016 Chennai

Software Engineer

Citus Soft

Developed an online education portal using modular PHP architecture and automated Linux deployment packages, reducing manual setup time by 50%.

Big Projects

Selected platforms and systems from enterprise delivery work.

Enterprise CRM

Whitecup CRM

Multi-tenant CRM platform with reusable modules, workflow automation, dynamic RBAC, ERP/mail integrations, Redis-backed optimization, and rapid client-specific implementations.

Role
Architecture and engineering lead
Scale
20+ US enterprise clients
Impact
Reusable modules and faster client implementations
  • PHP
  • Yii
  • MySQL
  • Redis
  • REST APIs
  • IIS

Travel Platforms

ClarityIBE, ClarityNDC, ClarityGTS

High-volume travel platforms with B2B/B2C booking flows, multi-GDS integration, dynamic pricing, contract automation, and CI/CD release automation.

Role
Technical project manager
Scale
5M+ monthly API calls
Impact
Release cycle reduced from 2 weeks to 3 days
  • Laravel
  • Vue.js
  • Nuxt.js
  • MySQL
  • jQuery
  • Git

Booking Systems

B2B/B2C Travel Booking Engines

Flight, hotel, and vacation package systems with supplier connectors, middleware APIs, payment gateways, production hot-fixes, and zero-downtime feature releases.

Role
Senior software engineer
Scope
Flights, hotels, packages, and payments
Impact
Supplier integration timelines reduced by 30%
  • React.js
  • Node.js
  • PHP
  • CodeIgniter
  • MySQL

Achievements and Certifications

Credentials that support cloud, AI, Linux, and enterprise delivery work.

AWS Certified Solutions Architect - Professional

SAP-C02 certification aligned to scalable cloud architecture and production platform decisions.

Microsoft Azure AI Essentials

Professional certificate supporting AI service awareness and modern platform capability planning.

Ubuntu Linux Professional Certificate

Canonical credential supporting Linux packaging, deployment, and server-side operations.

Career Essentials in Generative AI

Microsoft certification focused on practical GenAI awareness for software and business workflows.

AI Workflow

Using AI tools to improve engineering speed without reducing code ownership.

Claude

Used for architecture thinking, complex problem breakdown, implementation options, and technical writing support.

Cursor

Used inside the editor for code navigation, refactoring support, quick iteration, and context-aware implementation flow.

Codex

Used for implementation assistance, code review, test ideas, documentation updates, and structured codebase changes.

Responsible Usage

AI output is reviewed against business rules, system behavior, security expectations, and maintainable engineering standards.

Contact Me

Need an engineering lead for CRM architecture, Laravel platforms, or travel technology delivery?

Based in Chennai, India. Available for engineering leadership, SaaS platform delivery, CRM modernization, API integrations, AI-assisted engineering workflows, and performance-focused product work.

Languages: English, Tamil