Roshan Kumar Jha

Senior Product Engineer with 7+ years of experience building scalable web platforms in fintech and enterprise SaaS. Proven track record of leading frontend and full-stack architecture decisions, driving performance optimizations, and implementing AI/LLM-augmented development workflows that increased team velocity by 50%. Experienced in React.js, Next.js, Node.js, TypeScript, SQL and NoSQL with a focus on config-driven, maintainable systems serving 10M+ users.

Senior Product Engineer at Envisso (2024-10 – 2025-11)

Senior Product Engineer at Envisso, leading full-stack development for merchant risk monitoring solutions.

• Architected and shipped a full-stack merchant risk monitoring dashboard v2.0 using Next.js, Typescript and PostgreSQL tech stack, serving 50,000+ high-risk portfolios across multiple PSPs, enabling real-time analytics for fraud and risk analysts.
• Improved frontend performance using debouncing, virtualization, lazy loading, and caching strategies, significantly reducing page load times and resource consumption.
• Achieved 10x database performance gains by optimizing legacy queries handling millions of transaction records through strategic indexing, query rewrites, and caching — directly enabling real-time risk analytics.
• Drove adoption of an AI/LLM-integrated (Cursor and Claude code) development workflow, increasing team development velocity by 50% and reducing application bugs by 90%.

Staff Engineer at Nagarro (2024-04 – 2024-10)

Staff Engineer at Nagarro, delivering UI features and performance optimizations for large-scale e-commerce and education platforms.

• Delivered UI features for the subscriptions module of a large-scale e-commerce platform serving 100M+ users; owned performance optimizations that improved Lighthouse scores to 90–100 by analyzing Core Web Vitals.
• Led UI development for in-app notes generation feature for a student web app, reducing estimated note-taking time by up to 50%.
• Improved overall application stability by identifying and resolving performance bottlenecks and critical production bugs.

Software Developer at Leena AI (2021-10 – 2024-04)

Software Developer at Leena AI, architecting scalable web solutions and building integration APIs for enterprise HR systems.

• Architected WebViews v2.0 using React.js with a config-driven UI architecture, eliminating custom development requirements per client and reducing integration time by 70% — deployed to 10M+ enterprise users.
• Implemented advanced frontend optimization techniques including code splitting, lazy loading, virtualization, debouncing, and memoization to enhance performance across high-traffic enterprise clients.
• Built Node.js / Express.js REST APIs on a MongoDB backend to integrate with third-party HR systems (Oracle, SAP SuccessFactors), enabling seamless data exchange between external platforms and the frontend.
• Contributed to a shared component library for Leena AI's product suite, unifying design language, accelerating cross-team velocity, and eliminating component redundancy.
• Developed features for the Dashboard's onboarding/offboarding module, applying modern design patterns to improve long-term maintainability.

Senior Systems Engineer at Infosys Ltd. (2018-09 – 2021-10)

Senior Systems Engineer at Infosys, developing PL/SQL solutions and optimizing database performance for enterprise systems.

• Developed and integrated a custom PL/SQL solution replacing legacy job schedulers, improving job processing performance by 20%.
• Implemented data validation logic to detect, prevent, and alert on anomalies from third-party systems processing 100K+ records daily, preventing data corruption incidents.
• Analyzed Oracle execution plans and implemented strategic index optimizations, improving query performance by up to 90% and dramatically enhancing application responsiveness.

B.Tech in Electronics & Communications Engineering – MAIT, New Delhi (2014-08 – 2018-06)

XII (Higher Secondary) in CBSE – I.P. Convent Sr. Sec. School, New Delhi (2014-05 – 2014-05)