Kartikay Malik

Senior Frontend Engineer with 8+ years of experience building scalable, high-performance web applications. Strong expertise in React.js, Next.js, TypeScript and Redux with hands-on experience in defining frontend architecture, state management strategies, and reusable component systems. Proven track record of improving Core Web Vitals, leading teams, and delivering production-grade applications with strong focus on performance, accessibility, and engineering best practices.

Lead Engineer at Castler (2024-09 – Present)

• Architected and scaled Castler's fintech platform (escrow, eNACH, UPI QR, Cashfree integration) using React 18, TypeScript, and modular microfrontend-style architecture with lazy loading and code splitting for optimal bundle performance
• Built a reusable bank-integration framework, reducing development time by 50% across all new modules.
• Added Microsoft Clarity for real-time user behavior analytics, heatmaps, and session monitoring, improving UX decisions and reducing issue resolution time.
• Enforced cross-browser compatibility and WCAG accessibility best practices across all consumer-facing modules
• Conducted code reviews, enforced standards, and worked extensively on performance optimization using Lighthouse audits and bundle analysis

Senior Software Engineer at Paytm (2020-01 – 2024-09)

• Owned FASTag Acquirer System (Transaction Module), enabling automated toll and parking fare calculation & NPCI-based transaction processing at national scale
• Led frontend development of Paytm's NCMC consumer app a React-based SSR application serving 10M+ users using custom Webpack and Express architecture and route-based code splitting
• Boosted bank app's localization by optimizing key management and introducing caching, minimizing network calls by 30 API calls per user session.
• Established end-to-end testing using Playwright (TDD), reducing production bugs by 20% and QA effort by 40%
• Implemented logging and monitoring via Sentry & New Relic, enhancing log management and system oversight, significantly reducing errors and improving user flows.
• Engineered Financial Reconciliation automation with performance insights and a robust RBAC-based authorization system
• Built a reusable, backend-driven form-builder component enabling dynamic, configurable UI for creating customizable forms.
• Drove microfrontend adoption using Webpack 5 Module Federation, for smoother updates and enhanced performance, simplifying app maintenance.
• Spearheaded & Managed a team of 4 frontend engineers, coordinating with product managers and backend developers to design APIs and schemas, enhancing team collaboration and project alignment.

Senior Software Engineer at Think Future Technologies (2017-07 – 2020-01)

• Integrated 3rd party payment methods (Payon, Trustly) for wallet fund addition.
• Developed multi-role BackOffice dashboard for Caspero support team, integrating social media platforms & facilitating successful project migration.
• Built a real-time customer-to-staff assistance feature for a karaoke venue client using Socket.io (WebSocket-based), enabling live help requests and instant staff notifications across concurrent booth sessions.
• Developed and administered React-based websites with reusable component & dashboard functionalities from scratch

Bachelor of Technology in Computer Science and Engineering – Delhi Technological University (2013-07 – 2017-06)