Vivek Kumar

Diagnosed critical bundle-bloat through Webpack analysis, code-splitting, lazy loading, and memoization, slashing page-load time by 40% across core financial servicing modules. Engineered a customizable analytics dashboard for senior stakeholders, integrated an embedded survey module reducing manual reporting overhead by 40% and cutting feedback turnaround from days to hours. Architected and delivered a gratuity calculation and processing module handling complex statutory eligibility rules, multi-tenure employee records, and automated payout workflows, reducing HR processing time by 65% across 12000+ employee records. Rebuilt the employee onboarding flow, reducing completion time by 50% and cutting support tickets by 70%. Designed a shared UI library adopted across 4 product squads, compressing feature-release cycles by 25-30% and eliminating 8,000 lines of duplicated code. Introduced Redux Toolkit and React Query with client-side caching and optimistic updates, reducing API over-fetching by 60%. Delivered full WCAG 2.1 AA compliance across 15+ modules. Shipped React Native modules with dynamic theming and i18n supporting 3 languages and 6 device form-factors. Led daily syncs with PM, UX, backend engineers, and QA, shipping features with zero scope-creep escalations across 8 consecutive sprints.

Designed and shipped a module-federation framework enabling 3 independent teams to deploy in parallel, reducing release contention by 70% and cutting time-to-production from days to hours. Led full codebase migration from JavaScript to TypeScript across 40,000+ LOC, reducing new-engineer onboarding from 2 weeks to 4 days and cutting runtime type errors in production by 80%. Built GitLab CI/CD pipelines with automated test gates, compressing release turnaround from 3+ days to under 2 hours and eliminating all manual deployment errors. Profiled bottlenecks via Lighthouse and React DevTools, lifting scores from mid-60s to 90+ across 3 product areas. Authored internal utility and component libraries used by 2 product teams, saving an estimated 46 engineering hours per sprint.

Engineered a zero-dependency Vanilla JS module that renders any target website inside a sandboxed iframe and exposes its DOM for real-time content injection and substitution; paired with an embedded Monaco Editor instance so marketers could author and preview HTML/CSS/JS overrides in-browser without engineering support, enabling personalised ad and campaign content to be targeted and deployed to audience segments in minutes rather than days, and reducing campaign turnaround time by 60%. Delivered a drag-and-drop Page Builder that enabled content teams to publish pages without engineering dependency, eliminating an average 3-day developer bottleneck per content cycle. Built 6 configurable dashboards (Recharts and Chart.js) adopted by 3 business units, replacing ad-hoc reporting and cutting analyst-to-insight time by 50%. Refactored fragmented UI into reusable component layers, reducing code duplication by 35% and cutting time to implement new feature variants from days to hours. Mentored 2 junior developers on component design patterns; both were promoted to mid-level roles within 12 months.

Refactored 4 legacy chart-heavy dashboard components, eliminated memory leaks and re-render loops, reducing frame-drop incidents from weekly to zero over 3 months. Decomposed a monolithic 8,000-line UI module into 14 feature-scoped components, enabling independent testing and parallel development across 2 engineers.

Built responsive, cross-browser UI flows for a customer-facing financial application; UX improvements from feedback cycles measurably improved form completion rates in A/B testing.