India · Available for work
Raj KumarMahto
I build high-performance interfaces for AI-driven and data-intensive products. Three years spent on streaming interfaces, frame-accurate editors, and architecture that holds up under production load — owning products from the first commit to the last deploy.
I · Lumos
The Practitioner
Frontend Engineer with 3 years of experience building high-performance interfaces for AI-driven and data-intensive applications. Specialized in streaming/real-time UIs, performance optimization, and scalable frontend architecture, with a proven track record of owning products end-to-end, from 0→1 to production while improving reliability, user experience, and engineering velocity.
I work best where the frontend stops being a view layer and starts being a system: parsers that read half-written payloads, timelines measured in frames rather than pixels, billing flows that must never lose a transaction. Currently the sole frontend engineer on a multi-tenant AI platform at Hypergro.ai, where I have shipped everything from the ad-generation stream to the video editor to the checkout.
Streaming & Real-Time
Interfaces that render while the data is still arriving — incremental parsing, SSE, and partial hydration that make latency invisible.
Performance
Code splitting, SSR, render budgets, and profiling. Fast is a feature, and it is the one users notice first.
Architecture
Domain-split state, request-scoped data layers, and tenant isolation — structure that stays legible as the product grows.
Ownership
0→1 to production: scoping, building, integrating, shipping, and holding the pager afterwards.
II · Chronicles
Where I've Practised
Three years of shipping — the roles, and what was actually built in them.
Hypergro.ai
Software Development Engineer (SDE-2)
Oct. 2023 — Present
Bengaluru, India
Sole frontend engineer on a 0→1 multi-tenant AI SaaS platform — owning streaming UIs, a browser video editor, billing, and serverless rendering pipelines end-to-end.
Architected a real-time AI ad-generation pipeline over streamed backend responses using a custom incremental JSON parser (brace-depth + string-aware state machine), rendering partial payloads mid-stream to hydrate 10+ live UI components and reducing ad-creation time by 70%.
Built a browser-based non-linear video editor on Remotion with a frame-accurate multi-track timeline (custom pixels↔frames scaling, draggable playhead, clip trim/drag), domain-split Zustand state (5 stores) with snapshot-based undo/redo and autosave, live preview, and cloud export via Remotion Lambda with real-time progress polling.
Led frontend development as the sole frontend engineer for a 0→1 multi-tenant SaaS platform, building dashboards, analytics, and a request-scoped data layer enforcing brand-level tenant isolation while integrating backend services and third-party APIs with zero frontend-driven payment failures.
Owned the end-to-end subscription checkout experience, implementing plan selection, coupons, billing, and post-payment verification using Remix fetchers across multiple payment gateways (Razorpay, Cashfree) with idempotent retries and graceful failure recovery.
Extended an open-source visual editor into a JSON-driven email platform with MJML→HTML rendering, multi-format export (HTML/PDF/JPEG), and navigation safeguards (route blockers + beforeunload) that eliminated data loss.
Engineered serverless rendering pipelines (HTML → PPTX/PDF/image) on headless-browser infrastructure, supporting dynamic multi-slide composition and high-volume concurrent exports while improving scalability and rendering performance.
Zimyo HR Software
Web Developer (Intern)
Mar. 2023 — Jun. 2023
India
Built configurable, rule-driven UI systems for an HR platform serving hundreds of client organizations.
Engineered configurable, rule-based UI components using React and TypeScript with dynamic form generation and state-driven rendering, supporting 500+ client organizations with zero per-client customization overhead.
Improved frontend stability through strong input validation, error boundaries, and defensive coding practices, reducing QA regression tickets by 25% across data-heavy workflows.
Integrated RESTful APIs with async state management for multi-step forms, validating end-to-end data flows and contributing to the successful delivery of 3 major releases within sprint timelines.
III · Artefacts
Selected Work
Six things I built and owned — the streaming pipeline, the editor, the platform, and the plumbing that keeps them running.
Real-Time AI Ad Generation
A streaming pipeline that renders AI output while it is still being written — a custom incremental JSON parser turns half-finished payloads into live, hydrated UI.
- Brace-depth + string-aware state machine parser
- 10+ components hydrated mid-stream
- 70% reduction in ad-creation time
Browser Video Editor
A non-linear, frame-accurate video editor running entirely in the browser on Remotion, with a multi-track timeline and cloud rendering.
- Custom pixels↔frames scaling & draggable playhead
- 5 domain-split Zustand stores, snapshot undo/redo
- Remotion Lambda export with live progress polling
Multi-Tenant SaaS Platform
A 0→1 platform built as the sole frontend engineer, with a request-scoped data layer that enforces brand-level tenant isolation on every read.
- Dashboards & analytics from scratch
- Request-scoped tenant isolation layer
- Zero frontend-driven payment failures
Subscription & Checkout
End-to-end billing ownership across multiple gateways — plans, coupons, verification, and failure recovery that never drops a transaction.
- Razorpay + Cashfree integration
- Idempotent retries & graceful recovery
- Post-payment verification flow
JSON-Driven Email Platform
An open-source visual editor extended into a full email platform with MJML compilation and multi-format export.
- MJML→HTML rendering engine
- HTML / PDF / JPEG export
- Route blockers + beforeunload guards
Serverless Render Pipelines
Headless-browser infrastructure that turns HTML into presentation-grade artifacts at high concurrency.
- HTML → PPTX / PDF / image
- Dynamic multi-slide composition
- High-volume concurrent exports
IV · Pensieve
Earlier Conjurings
Full-stack builds and faithful clones from before the day job — kept here the way memories are kept in a Pensieve, silver threads and all.
V · Grimoire
The Toolkit
What I reach for, grouped by where it lives in the stack.
Languages & Frontend
01The wand-work
- TypeScript
- JavaScript
- React
- Next.js
- Remix
- HTML
- CSS
- Tailwind CSS
- ShadCN/UI
- Radix UI
State & Backend
02The inner workings
- Redux Toolkit
- Zustand
- Axios
- REST APIs
- SSE/Streaming
- Node.js
- Express.js
- MongoDB
- Firebase
Cloud & Tools
03The instruments
- Docker
- AWS (Lambda, S3)
- CI/CD
- Git
- GitHub
- Vite
- Webpack
- Postman
- Figma
Core Craft
04The advanced studies
- Remotion
- MJML
- SSR
- Code Splitting
- Data Structures & Algorithms
- Performance Tuning
- Accessibility
VI · Academia
Schooling
Masai School
Full Stack Web Development
Neelashaila Mahavidyalaya
Bachelor of Commerce
VI · Owl Post
Let's build somethingworth remembering.
Open to frontend roles where the interface is the hard part — streaming, real-time, editors, and platforms that need architecture rather than pages. The owl is always awake.