Frontend Engineer · Jumbo · Delhi, India
Interfaces people trust with their money.
I build React, Next.js, and TypeScript interfaces for fintech and government products: dashboards, KYC flows, and web apps that run inside mobile clients. 3+ years in production.
Selected work
4 case studies
Each project has a write-up: the problem, my role, the decisions that mattered, and the outcome.
No. 01
Promoter platform inside a React Native app
A React and Vite web app that runs inside a React Native client through a WebView: onboarding, KYC, referrals, transactions, withdrawals, and invoice previews.
Production work in React, Vite, TypeScript, React Native WebView, TanStack Query, and React Hook Form
100K+users
No. 02
Opinion trading ops platform
Admin tooling for live opinion-trading events: event, topic, and template management with status workflows, draft editing, and cursor-based pagination.
Production work in React, TypeScript, TanStack Query, React Hook Form, and Zod
200+concurrent live events
No. 03
National government portals
React and Next.js delivery for national portals, including DFPD and Atal Bhujal Yojana, with performance, accessibility, and SEO held to public-sector standards.
Client work in React, Next.js, TypeScript, React Query, and Redux Toolkit
30–40%faster page loads
No. 04 · Open source
isobath
An open-source engineering interview guide, from language and spec to infrastructure. Started as the Frontend Master Prep Series, rebuilt as isobath.
127+ GitHub stars
Experience
3+ years shipping production React for fintech and government products.
Jan 2026 – Present
Delhi
Jumbo
Frontend Engineer
- Built the promoter web app from zero to production as its primary owner, in React, Vite, and TypeScript: KYC with document upload, onboarding with contract signing, transactions, withdrawals with PDF invoice previews, referrals, and a dashboard. It serves 100K+ users inside the React Native client through a WebView.
- Designed the WebView integration layer: a JS-bridge auth handshake with token injection and window messaging, keyboard-offset handling, pull-to-refresh, and an in-app debug console for diagnosing issues on device.
- Shipped the Opinion Trading admin platform on the ops dashboard: event, topic, and template management with status workflows and cursor-based pagination. It runs operations for 200+ concurrent live events.
- Cut form error rates ~50% across KYC and financial flows with schema validation, granular loading states, and API-driven error handling. A reusable form component library cut feature build time 25–30%.
- Now working on the consumer mobile app in React Native and TypeScript, on product features and release quality, plus CI quality gates in GitHub Actions and Vitest and Playwright tests.
Stack: React, TypeScript, Vite, React Native, React Native WebView, TanStack Query, TanStack Router, React Hook Form, Zod, Vitest, and Playwright
Sep 2023 – Nov 2025
Ghaziabad
Kreate Technologies Pvt. Ltd.
Frontend Engineer
- Owned frontend delivery for 4+ client products in React and Next.js, from build to production, including the national government portals DFPD and Atal Bhujal Yojana.
- Grew from Trainee to Junior UI Developer to UI Developer.
- Made pages load 30–40% faster with code-splitting, lazy loading, and asset optimization, and reached 90+ Lighthouse scores with SSR/SSG, semantic HTML, and Core Web Vitals-driven metadata.
- Cut redundant API calls ~20% by moving data fetching to React Query alongside normalized Redux Toolkit state.
- Brought 3+ projects to WCAG 2.1 AA with semantic HTML and full keyboard support.
Stack: React, Next.js 14, TypeScript, Tailwind CSS, React Query, Redux Toolkit, Zustand, and GraphQL
Earlier career and education
Apr 2023 – Sep 2023
Digidex Labs · Frontend Developer
Mar 2022 – Mar 2023
BPCL · Engineering Apprentice
2017 – 2021
GITAM, MDU Rohtak · B.Tech, Electrical Engineering
Skills
Grouped by the part of the job they serve. Weight shows depth.
- Primary
- core stack
- Strong
- used regularly
- Familiar
- working knowledge
Interface craft
Product screens, dashboards, responsive UI
- React, Primary
- Next.js, Primary
- TypeScript, Primary
- JavaScript (ES6+), Primary
- Tailwind CSS, Strong
- Vite, Strong
- Figma, Familiar
- SCSS, Familiar
- GSAP, Familiar
- Framer Motion, Familiar
Data and state
API-heavy UI, validation, and error paths
- TanStack Query, Strong
- TanStack Router, Strong
- Redux Toolkit, Strong
- Zustand, Strong
- React Hook Form, Strong
- Zod, Strong
- REST APIs, Strong
- GraphQL, Familiar
Delivery quality
Performance, accessibility, testing, and CI
- Vitest, Strong
- Playwright, Strong
- GitHub Actions, Strong
- Lighthouse, Strong
- Web Vitals, Strong
- Accessibility (WCAG 2.1 AA), Strong
- SEO / SSR / SSG, Strong
Mobile bridge
React web modules running inside React Native clients
- React Native WebView, Strong
- chrome://inspect debugging, Strong
- React Native, Familiar
Contact
Email is the fastest way to reach me. The form sends to the same inbox.
- in/maurya-sachin
- GitHub
- maurya-sachin
- Phone
- +91 8586025785
- Resume
- PDF · Google Doc (opens in a new tab)Updated Aug 2026