Thinks beyond the interface
He writes solid and safe code, but also understands the bigger picture: architecture, system design, documentation, and maintainability.
Suman Kumar Sinha
I build web, mobile, and desktop products, and the backend systems behind them.
Where I have worked
LifestackSoftware Engineer30K+ users#4 on Product HuntOct 2024 to Jul 2026
EllenoxSoftware EngineerFeb 2023 to Jun 2025
AllCodeWeb DeveloperJun 2022 to Feb 2023
Lifestack started part-time in Oct 2024, went full-time in Mar 2025, and overlapped Ellenox through Jun 2025.
At Lifestack, I built team planning and integrations. The product reached 30K+ users and ranked #4 Product of the Day on Product Hunt.
Part-time from Oct 2024 to Mar 2025, then full-time. This overlapped Ellenox through Jun 2025.
- Built Team Plan so teammates could share calendars, assign tasks, and plan together.
- Connected seven calendar and task apps, including Apple Calendar and Reminders, so people could bring their existing plans into Lifestack.
- Made shared changes reliable when multiple people edited the same plan at once.
Features I shipped into production
Selected for product surface area, hard sync problems, launch pressure, and visible user impact.
LifestackTeam planning
Team Plan for shared calendars and tasks
Built the product surface and backend for shared tasks, calendars, invitations, roles, permissions, ownership transfer, shared day views, and cross-platform sync.
#4 Product Hunt- 107 comments
LifestackIntegrations and sync
Seven calendar and task integrations
Delivered Apple Reminders, Apple Calendar, Todoist, TickTick, Notion, ClickUp, and Google Tasks integrations, including native Apple work in React Native.
- 7 integrations
- Native Apple integrations
EllenoxGOLF.com Course Finder
Course Finder for GOLF.com
Built the map-led interface, mobile layouts, and large-dataset rendering for a searchable course database that accounted for about 20% of GOLF.com traffic.
- 20% of GOLF.com traffic
- Map + mobile UI
Frontend Craft
Frontend and product surface, mine end-to-end.
Pikzels
React and TypeScript product and marketing surfaces for a creator tool focused on YouTube thumbnails, titles, scoring, personas, and style consistency.
Built solo, end-to-end for a creator product with 330K+ monthly visitors.
NexLev
Frontend landing and marketing system for a creator-growth platform around niche discovery, automation, pricing, testimonials, FAQs, and signup flows.
Built solo, end-to-end as a single-weekend ship.
Ads Library
Search and discovery interface for browsing ads across Facebook, TikTok, YouTube, Instagram, X, and LinkedIn.
Built solo, end-to-end for cross-platform ad discovery.
A bit aboutme.
I’m Suman. I get a little picky about how software feels. If dragging a task feels a beat too slow or a screen makes you stop and think, I’ll keep tinkering until it feels right.
I also like poking around behind the screen: why a calendar didn’t update, what happens when two people change the same task, that kind of thing. The best part is when nobody using it has to care about any of that.
Lately
AI has been taking up more of my build time. I’m comparing frontier and open-source models and working with RAG, fine-tuning, and agents. The interesting bit is what happens after the demo: how fast it feels, what it costs to run, and whether the model was the right choice at all.
Hugging Face
LangChain
Gradio
Across the stack
- React
- Next.js
- JavaScript
- TypeScript
- Tailwind
- React Native
- Redux
- Node.js
- REST APIs
- Firestore
- Cloud Functions
- Firebase
- Supabase
- Electron
- GitHub Actions
- Cloudflare
- Google Cloud
These lovely people say,
Good work,in their words.
Showing review 1 of 5 from Hayato Waki.