Full Stack Product Engineer
AmanPrajapati
I build software that real businesses actually run on — ERP platforms, order systems, mobile apps. Solo tech lead at a food distribution company, shipping code that goes straight to the CFO's dashboard.
- Role
- Full Stack Product Engineer
- Base
- Mumbai, India
- Coord
- 19.076°N 72.877°E
Live in production — open the software
422
REST Endpoints
42
Mongo Collections
20
RBAC Roles
172K
Lines in Production
62
Mobile Screens
10
Products Built
I don't just write code — I build software businesses run on.
Based in Mumbai, India. I take products from a blank repository to real users, owning architecture, infrastructure, security and AI integration — and I stay on them after they ship.
Credentials
BSc Computer Science
Foundation
MCA
Master of Computer Applications
Production Systems
Designed, shipped & owned
Cloud & Infrastructure
Deployed & scaled
Certifications
- MERN Stack ProgramFull-stack foundation
- AWS Cloud Internship ProgramCloud fundamentals
The journey
- 01
BSc Computer Science
The fundamentals — algorithms, systems, the why beneath the what.
- 02
MCA
Master of Computer Applications — depth in software engineering.
- 03
Mobile Application Developer
Shipping Flutter apps to the Play Store and App Store.
- 04
Full Stack Engineer
Owning the stack end-to-end — frontend to database to deploy.
- 05
Enterprise Product Builder
Architecting production platforms that run real businesses.
- 06
AI Systems Engineer
Embedding Gemini, vector search and AI workflows into products.
11 builds. 4 live in production.
Enterprise platforms, mobile apps, an ERP core, an event-driven data pipeline, an offline AI app and a game-engine port — each taken from an empty repository (or a Windows-only one) to something that runs. Open any row for the architecture diagram and the reasoning behind it.
Ten stages, forty states, twenty roles.
An ERP-class order pipeline that a real business runs on. Every stage name, state, role, upload type and notification rule below is read straight off the running system.
Order Entry
Sales · Sales Executive
Booked on the mobile app in the field or on the web console, with PO copy and site photos attached at source.
PendingBook OrderDraftFuture Ordered
Sales Hub
NSM · RSM · ASM
The sales line reviews and places the order; future-dated orders are parked until their release window.
Placed Order
STN Planning
STN Planner
Internal stock transfers are planned separately from customer orders, then re-enter the same pipeline.
Pending STN Planning
Credit Approval
Credit Control · Gemini risk score
Exposure, ageing buckets and overdue ratios are scored; low risk auto-approves, critical is held and escalated.
Pending Credit ApprovalCredit ApprovedOn HoldRejected
Warehouse Selection
WH Manager
Stock is checked per warehouse; an order that can't be served from one site splits into per-warehouse child orders.
Pending WH SelectionWH AssignmentWarehouse Assigned
Packing & Batch Allocation
WH Manager · Warehouse staff
Picking against specific batches with FEFO ordering and decimal quantities for weighed goods; shortfalls raise a residual order.
Pending PackingPacking StartedPart PackedPackedBackorder
Quality Control
QC Head
Physical check with photo evidence attached to the order; a rejection routes straight back to packing.
Pending QCQuality ApprovedQuality Rejected
Logistics Cost
Logistics Lead · Hub Lead
Freight, loading and insurance are itemised. Any order whose shipping exceeds 15% of its value is held for admin review.
Pending Logistics CostCost AddedPending Admin Review
Invoicing
Billing
Invoice and e-way bill generated, with the document mailed out and stored on the CDN.
Ready for InvoicePending InvoicingInvoicedPending E-Way Bill
Dispatch, Delivery & Acknowledgement
Dispatch · Delivery Team · Driver
Manifest, seal number and vehicle assigned, then live GPS tracking until the customer signs — including partial acceptance and returns.
Ready for DispatchDispatchedIn TransitOut for DeliveryDeliveredPart AcceptedReturned
A transition validator holds the whole graph — 40 named states with an explicit allow-list of next moves each. An order cannot skip credit, or get invoiced before QC clears it.
Systems, not scripts.
I make the architecture decisions before the first line of code, and I stay with the system after it ships.
What I design for
Scalable Backend Architecture
Modular, middleware-driven services that grow without rewrites.
Realtime Systems
Socket.IO rooms streaming sub-second updates to every client.
RBAC Security Design
20+ roles, permission guards and a secure middleware chain.
Audit Logging Systems
Every state change traced — who, what, when, immutable.
Notification Engines
FCM push, web push and email across one unified pipeline.
AI Systems
Gemini risk scoring, embeddings and RAG-style retrieval.
Cloud Infrastructure
Cloudflare, Nginx and PM2 on DigitalOcean — Prod & UAT, self-rolling-back deploys.
Data Pipelines
Event streams, exactly-once effects, aggregation pipelines and index design.
How a feature actually ships
- 01
Understand
Sit with the people who will use it, then write down the data, the edge cases and what 'done' means.
- 02
Design
Data model, API contract and the trade-offs — decided before the first line of code.
- 03
Build
I write it, using AI tools like Claude and Cursor to move faster on the routine parts.
- 04
Review & test
Every line read, edge cases tried against real-shaped data on UAT. Nothing ships unreviewed.
- 05
Ship & run
Deployed with a health check and rollback, then watched on Sentry and PostHog and fixed with the business.
I own what I ship.
I use AI tools to move faster. The design, the review and what happens in production after release are my responsibility.
Tools I use
Claude · GPT · Gemini · Cursor
The full stack behind it.
Everything below is something I've shipped with, not something I've read about.
Frontend Engineering
01Web
Angular · React · Next.js · TypeScript · Vite · Tailwind CSS · Framer Motion · GSAP · Responsive Design · PWAs
Mobile
Flutter · Provider · Hive · SQLite · Local Notifications · Google Maps SDK · Biometric Auth · Offline-First · Cross-Platform · Android Deploy · iOS Deploy
Backend Engineering
02Node.js · Express.js · NestJS · TypeScript · REST API Design · JWT Auth · RBAC · Middleware Architecture · Repository Pattern · Service Layer · Audit Trails · Excel Processing · File Upload · PDF Generation · Email Services · OTP Auth · Real-Time APIs · API Security · Rate Limiting · Request Validation · Error Monitoring · Background Processing
Databases
03MongoDB · Mongoose · PostgreSQL · TypeORM · Redis · Aggregation Pipelines · Indexes · Query Optimization · Schema Design · Data Modeling · SQLite · Hive · Local Storage
Real-Time Systems
04Socket.IO · Redis Streams · Consumer Groups · Transactional Outbox · Exactly-Once Effects · Backpressure · Live Notifications · Real-Time Dashboards · Live Order Tracking · Mission Tracking · Warehouse Updates · Instant Sync · Cross-Platform Sync
Cloud & Infrastructure
05DigitalOcean Droplets · Oracle Cloud VMs · DigitalOcean Spaces · CDN Architecture · Nginx · PM2 · Cloudflare (WAF, edge rate limits) · Origin firewall (UFW) · GitHub Actions CI/CD · Health-checked auto-rollback · Docker Compose · AWS S3 + Object Lock · Linux Administration · SSL Management · Server Deployment · Production Monitoring · Environment Management · Infra Scaling
Third-Party Integrations
06Google Gemini AI · Firebase Cloud Messaging · Firebase Admin SDK · Google Maps Platform · Resend Email API · DigitalOcean Spaces · CDN Delivery · Sentry · PostHog · Razorpay
AI Engineering
07Google Gemini · Risk Analysis Engine · Credit Assessment · Business Intelligence · AI Daily Briefings · AI Alert Analysis · TensorFlow Lite · Google ML Kit · On-Device Inference · Face Embeddings · Prompt Engineering · Backend AI Proxy · Secure API Routing · Decision Support
Security Engineering
08JWT Auth · RBAC · bcrypt · OTP Verification · Token Validation · API Protection · Permission Matrix · Audit Logging · Secure File Upload · Signed Short-Lived URLs · Secrets Management · SSH Hardening · Incident Response · Backup & Restore Drills · Session Security
Enterprise Architecture
09422 REST Endpoints · 20 RBAC Roles · 42 Mongo Collections · 10-Stage Order Workflow · Multi-Warehouse · Order Lifecycle · Credit Control · Inventory · Dispatch · Logistics · Route Tracking · Customer Mgmt · Audit Mgmt · Analytics · Sales Hierarchy
Let's build something.
Have a product to architect, a system to scale, or a team to strengthen? I'm one message away.
- Phone
- +91 8369259104
- in/aman-prajapati
- Resume
- Open resume