The full-stack
developer you've
been eager
to work with.
A portfolio of finance automation, analytics platforms and end-to-end web products — built with React, Node and a quiet obsession for craft.
Crafting software that quietly does the heavy lifting.
I'm Gaurav Kumar — a full-stack developer at B3 Solution shipping React + Node products that real finance teams use every day.
I built the company's flagship Amazon Analytics platform — six modules tracking ACOS, ROAS, CPC and ad spend — alongside four finance dashboards that cut reporting time by 70% and automated 60%+ of manual workflows.
End-to-end ownership from architecture to deployment. Quiet code, fast UI, business outcomes.
A few things — 2024 / 2026
Amazon India Analytics Dashboard
- 7 pages — Ad Reports, Comparison, Trend, Master, ASIN to Keyword & ASIN Engine
- Puppeteer Stealth auto-fetches keywords for 18 ASINs every Monday — zero manual login
- 3,518+ keyword rows with full rank history stored in PostgreSQL
- Week-over-week rank: Organic vs Sponsored side-by-side with trend chart
- ROAS, ad spend, CPR scores, sessions & page views in one place
- 3–4 hrs/week of manual reporting → under 5 minutes
NeoMail — Email, reimagined
- JWT auth with HTTP-only cookies — tokens never exposed to JavaScript, preventing XSS
- Separate frontend & backend on Vercel with CORS configured for cross-origin cookie auth
- MongoDB TTL index auto-expires old emails — no cron jobs, no extra code
- Welcome emails seeded on first login — inbox always feels live, never empty
- Redux Toolkit for global state: auth, inbox, search, compose modal & sidebar
- Fully mobile-responsive — sidebar drawer, full-screen compose, stacked email cards
Graphic Design Services — USA
SEO-optimized multi-location platform serving 30,000+ US cities. +40% organic reach, −35% load time. graphicdesignservices.co
UK Petroleum Analytics Platform
Multi-tenant SaaS for UK petrol-station chains — ingests live Sage 50/200 audit-journal data and surfaces real-time KPIs: Gross PPL, EBITDA, Net Profit, per-grade fuel volume and site ROI. Four production clients on a single codebase — zero rewrites per new client. Weekly P&L close: 3 hrs → 20 min.
BulkGen — AI Bulk Image Platform
- 3-tier role system: superadmin → admin → user, each fully scoped — admins never see other admins' data
- Single prompt or Excel bulk upload → all images fired in parallel via Promise.all
- 13 preset sizes across 8 aspect ratios up to 2048×2048, plus custom W×H input
- Prompt Enhancer — raw prompt rewritten by Qwen3-8B LLM before generation
- ZIP bulk download, real-time progress bar, full history with search
- Docker: Vite frontend built inside container, served by Express — single image, no separate web server
Toolhub — Enterprise Tool Access Platform
- 3-tier RBAC: Superadmin → Admin → User with fully scoped data isolation at every layer
- Tool allowlist freeze — access snapshot on assignment prevents unintended access creep
- Real-time SSE notifications pushed instantly on any access change, persisted for offline users
- Transactional emails on every event: user created, access changed, password reset — with full tool lists
- Linked tool sync — provisions users on external platforms via API; non-blocking on failure
- Turborepo monorepo with shared @toolhub/ui · config · auth · api-client packages
What I do, in three columns.
Full-Stack Development
- React · Next.js · JavaScript
- Node.js · Express · REST
- MongoDB · PostgreSQL
- Auth, JWT
- Component-driven UI
- Architecture → deployment
Finance & Analytics Dashboards
- Cash flow, P&L, revenue
- KPI roll-ups · drill-downs
- Excel ingest · CSV export
- Real-time reporting
- Approval workflows
- Reporting time ↓ 70%
E-commerce Analytics
- Amazon Ads · ACOS · ROAS
- Helium 10 Cerebro integration
- Bulk ASIN → keyword
- Campaign comparison
- Multi-marketplace ready
- SEO-first product sites
From the — blog
How I built an Amazon Ads analytics dashboard with Puppeteer Stealth + PostgreSQL
A team I worked with spent 3–4 hours every Monday producing one ACOS/ROAS report. I replaced the pipeline with Node + Puppeteer Stealth + Postgres — weekly reporting now takes 5 minutes.
Read article →I built 4 finance dashboards in 9 months — the React + Node playbook
Different domains (reconciliation, AR aging, P&L, expense automation), same five underlying patterns. The denormalised reporting view, the freshness badge, the CSV export non-negotiable, and the audit log that won the team's trust.
Read article →@gmail.com
Open to full-time roles, freelance projects and finance / e-commerce automation work.
+91 — 78079 03562