Elango Ponnusamy
Frontend Engineer with 5 years of experience, based in Tamil Nadu, India
Over the past five years I have designed, built, and shipped production user interfaces for startups and established teams — from customer-facing React and Next.js applications to design systems, and the APIs and cloud deployments that support them.
What I build
My work centers on three principles: write code that is easy to maintain, ship features that perform under real traffic, and design interfaces that feel fast and intentional. I specialize in the React and Next.js ecosystem, TypeScript, modern CSS, and accessible component architecture, with working fluency across REST/GraphQL APIs and PostgreSQL.
Whether the task is a greenfield SaaS product, a legacy migration, or a performance audit, I focus on measurable outcomes — shorter load times, cleaner architecture, and fewer production incidents.
This site
On elangodev.com this is my professional profile: work history and education live on this About page and the author profile. I also publish open-source packages on NPM and keep a few learning pages — articles, the React roadmap, Node.js roadmap, and testing guides. See the editorial standards for how those resources are written.
Engineering principles
1. Maintainable architecture
I favor clear module boundaries, typed contracts, and patterns teams can extend without tribal knowledge. Simpler systems stay reliable as requirements change.
2. Measured performance
Core Web Vitals, server timing, and real user signals guide optimization — not guesswork. Improvements target LCP, INP, and TTFB with before/after evidence.
3. Accessible by default
Semantic HTML, keyboard paths, and contrast are part of the build checklist. Accessibility is a requirement for shipping, not a later polish pass.
Professional focus
Available for full-time roles, contract work, and technical consulting. Day-to-day work centers on product UIs, component architecture, and performance — with working fluency across APIs, data layers, and cloud deploys.
Education & growth
Continuous learning through production projects. Stack trade-offs, performance fixes, and architecture decisions from client work feed the next engagement.
Experience
Where I've worked
Full Stack Developer / JavaScript
Nov 2021 — Aug 2026
Thidiff Technologies
Web & Mobile Application Development Designed, developed, and maintained web and mobile applications for retail operations, including purchases, sales, attendance, inventory transfers, activity tracking, and reporting. Improved application performance, responsiveness, and usability across web and mobile platforms. System Integrations & Automation Built Slack webhook integrations to deliver real-time operational alerts and reports. Integrated the WhatsApp Business API with template messaging to automate shift reminders, transactional alerts, and business notifications. Implemented two-way Zoho Books API synchronization for invoices, vendor bills, expenses, and financial records. API & UI Optimization Optimized backend APIs, database queries, and frontend components to improve response times and provide smooth user experiences. Developed reusable UI components and streamlined workflows across web and mobile applications. Reporting & Data Visualization Created interactive dashboards and operational reports using Chart.js and Highcharts. Transformed complex business data into clear and actionable insights for administrators and management teams. Notifications & Automated Reporting Automated Slack notifications for purchases, sales, login activity, and critical system events. Integrated Bitbucket notifications for commits, pull requests, and merges. Developed scheduled email reports containing daily activity summaries and key performance metrics for administrators. Push Notifications – Firebase Cloud Messaging Implemented real-time mobile push notifications using Firebase Cloud Messaging. Handled foreground, background, and terminated application states to ensure the reliable delivery of critical alerts. Real-Time Voice Calling – Agora SDK Integrated real-time voice calling into a React Native application using the Agora SDK. Customized the calling interface, managed permissions and authentication tokens, and improved call connection performance and reliability.
Technical expertise
Open source
Beyond client work, I publish small NPM packages built from problems I hit in production—focused utilities other developers can install and use immediately.
Editorial standards
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Get in touch
For project inquiries, roles, or corrections to published material, use the contact page.