hey, Rajat here 馃憢

I'm a Senior Software Engineer at Walmart Global Tech with 6+ years of building high-performance apps at scale. I thrive on scaling teams, revamping platforms, and driving impact across big tech and early stage startups. Passionate about blending AI & LLMs into dev workflows, tightening security, boosting UX, and making products faster, smarter, and better

While there isn't a Wikipedia page about me (sorry folks! 馃榿), a detailed description of my work experience is available below.

Career

As a Senior Software Engineer, I build and test new features, optimize for speed, security, and cross-browser performance. I work with React, TypeScript, Next JS, Modular Components, Atomic Design System, Advanced Design Patterns, Web Vitals, CI/CD pipelines, etc. while mentoring juniors and seamlessly syncing Tech, Product, and Design teams.

Work Experience

  • kooLogo
    May 2024 路 Present
    Senior Software Engineer
    Walmart Global Tech
    Built and scaled the Living Design (Design System) UI Library which is used across Walmart platforms using Next.js, TypeScript, SASS, Tailwind, CVA improving UI consistency and reducing dev cycle time by 40%. Developed child apps like Data Dictionary and Knowledge Base with search module using Google Vertex AI from scratch, optimized for concurrency and modular reusability. Led performance tuning efforts, achieving sub-200ms latency for critical paths and supporting 1000s of RPM. Integrated analytics, caching, AI workflows, enhancing usability insights, conducted research for new design patterns, micro frontend architecture, MCP, reducing tech debt by 60% & improving overall Developer Experience (DX).
  • kooLogo
    Aug 2022 路 July 2023
    SDE III
    Vibecity
    Architected and developed a scalable B2B seller dashboard using React, Next.js (SSR), and modular TypeScript, supported 2,000+ sellers with seamless UX and < 250ms latency. Implemented real-time loggers and event tracking for marketing campaigns, enhancing user visibility and frontend observability at scale. Built key customer-facing features like user Wallet, Reviews, KYC, Refer & Earn designed for high responsiveness and smooth user experience. Collaborated closely with backend and infra to ensure frontend handled spikes of 50K+ concurrent sessions with consistent UI responsiveness.
  • kooLogo
    May 2021 路 Jul 2022
    SDE III
    Koo App
    Developed the all new 3 panel design for our webapp using Next & React, optimizing performance and user experience. Developed the Koo Embed system used by major media outlets like Times of India. Focused on website optimization, latency reduction, CDN performance, and security enhancements, including mitigating XSS and DOM Injection. Improved dashboards, content moderation, and reporting tools for the Operations team.
  • kooLogo
    May 2020 路 May 2021
    SDE II
    Greyamp Consulting
    Part of the core team to develop 'GALE' from inception to delivery, creating a robust Design System and pixel-perfect user interfaces with React and TypeScript. Actively contributed to product discussions, conducted code reviews, and enhanced website performance. Managed infrastructure on Google Cloud Platform, performed container orchestration with Docker, and automated configuration management using Ansible in Red Hat Enterprise Linux. Involved in Digital Engineering and Culture Pod, including developer interviews and onboarding.
  • kooLogo
    Jun 2018 路 May 2020
    Associate - Projects
    Cognizant Technology Solutions
    Contributed to the development team for the Claims engine and Insurance management in the TriZetto Provider Solutions project. Managed production-ready builds, deployments, and CI/CD pipelines using Microsoft Azure, ARM Templates, and Chef for configuration management. Collaborated with cross-functional teams across the United States. Hosted weekly knowledge sessions on Machine Learning and Blockchain to explore potential enhancements to our product