Rechvix
Accounting, inventory, GST and business operations on a double-entry ledger, for multi-company and multi-branch businesses.
Role: Lead developer.
- Double-entry accounting
- Row-level security
- Tax engine
- Inventory ledger
Raktim Ranjit builds business software and the systems behind it.
Founder of NodeDR Infotech Private Limited. I build software around real workflows, from billing and stock to restaurant orders and deployment.
A little guide to this site
Where would you like to start?
Choose a topic and I’ll point you to the right place.
Kolkata, where the work happens
Kolkata, IndiaIST
Introduction
A software engineer who builds complete systems.
I enjoy engineering problems that don’t fit neatly into one layer of the technology stack. A restaurant order crosses a menu, a till, a kitchen display, tax rules, staff permissions and a local network. An invoice can change stock, accounting entries and a customer’s balance at the same moment.
Those relationships are what I design for. I begin with the work people need to do, model the data and invariants, build the interface and API, secure access, then package and operate the result. OrderRestro and Rechvix show what that looks like in code.
That’s where I work best: between disciplines, close to the problem.
Build
Applications, SaaS, APIs, desktop software and business platforms.
How I approach it: BuildArchitect
Databases, workflows, permissions, integrations and distributed systems.
How I approach it: ArchitectDeploy
Linux, containers, CI/CD, networks, monitoring and production infrastructure.
How I approach it: DeploySecure
Identity, access control, application security, infrastructure hardening and auditability.
How I approach it: Secure
My approach
From the problem to the running system.
A complete product needs more than good screens. Each stage changes the decisions at the next: what the business means by a sale shapes the data model; that model shapes permissions, infrastructure and recovery. I keep those connections visible.
- 01 / 04
Understand
Watch the workflow, ask where records drift and learn what a person must decide.
- 02 / 04
Model
Define the data, states, permissions and invariants before they become hidden assumptions.
- 03 / 04
Build
Connect the interface, API and business rules so a complete task works end to end.
- 04 / 04
Operate
Deploy, observe, secure, back up and improve the system after its first release.
Featured case study · Rechvix
When an invoice changes four parts of a business.
Finalising an invoice in Rechvix can change stock, the accounting ledger, tax records and document numbering. I designed the operation as one transaction, with a movement ledger for inventory and tenant boundaries in both SQL queries and PostgreSQL row-level security.
The case study explains why I chose a modular monolith, how the runtime database role differs from the migrator and what a restore drill checks after a backup.
Selected software
Software built around the work.
Billing, retail, restaurants, pharmacies and ERP — the products I build and maintain.
OrderRestro
Restaurant POS, tables, kitchen display, reservations and loyalty, running on a server inside the restaurant.
Role: Lead developer.
- Real-time systems
- Offline-first
- RBAC
- WebSockets
NodeDR POS
Retail point of sale with GST-correct pricing, customer credit and stock, working with no internet connection.
Role: Lead developer.
- Offline-first
- GST pricing
- Desktop packaging
- Inventory
KinetiRx
Pharmacy billing, medicine stock with batches and expiry, patients, dues and OPD scheduling on a database the owner controls.
Role: Lead developer.
- Inventory with expiry
- Role-based access
- Server-sent events
- OCR
Zulivio
Employees, attendance, work assignments and a sales pipeline on the company's own server.
Role: Lead developer.
- State machines
- RBAC
- CRM
- CSV and Sheets import
Submify
A self-hosted form backend: one API key, every form on every site, stored in your own PostgreSQL.
Role: Lead developer.
- API design
- Key-based auth
- Presigned uploads
- Multi-tenant data
NodeDR Construction ERP
The full material lifecycle on a construction project, from site requisition to daily consumption, tied to milestones and budgets.
Role: Built at NodeDR Infotech, the company I founded.
- Approval workflows
- Permission matrix
- Audit log
- Background jobs
Blog
From the work itself
Engineering decisions, mistakes and trade-offs from projects I maintain.
Architecture · 6 min read
Stock balances belong in application code, not a database trigger
Why Rechvix updates its stock balance projection in Go inside the same transaction as the movement insert, what that costs, and how the risk is contained.
Cybersecurity · 7 min read
Row-level security is not your only tenant boundary
I read every repository in Rechvix and found thirteen lookups that relied on PostgreSQL row-level security alone. Here is what I changed and why the role design matters.
Infrastructure · 6 min read
What changes when the internet is optional: notes from building OrderRestro
Design consequences of running a restaurant system on the restaurant's own network, including a Secure-cookie trap that makes login look successful and then fail.
Enterprise Systems · 5 min read
Calculating GST from an inclusive MRP in a retail POS
A concrete pricing model from NodeDR POS: derive the tax portion from the shelf price, keep the server authoritative and test rounding at receipt level.
Engineering across layers
The system includes the parts between teams.
I build applications, but also work through their data integrity, access rules, deployment path and the networks they depend on. My expertise pages connect software engineering, enterprise workflows, AI and automation, DevOps, networking and cybersecurity to projects where those concerns are visible.
Photography
Through my lens
People, places and the small things I stop to notice.
The business behind the work
Building practical software at NodeDR
I founded NODEDR INFOTECH PRIVATE LIMITED to make dependable software for the work businesses do every day. Our products support accounting and inventory, restaurants, retail, pharmacies and workforce operations.
We start with the real workflow, then build the application, data model and deployment path around it. That means useful tools for the people doing the work, with systems the business can understand and operate.
Beyond engineering
Fiction and photographs
I write fiction and photograph people and places. Both parts of Proof of Absence are on the Writing page, and photographs are in the gallery.
Who is Raktim Ranjit?
- Who is Raktim Ranjit?
- Raktim Ranjit is a software engineer and product builder, and the founder of NODEDR INFOTECH PRIVATE LIMITED. He works across applications, data, security and infrastructure.
- What software has Raktim Ranjit built?
- Rechvix (GST billing, inventory and accounting), OrderRestro (restaurant POS), NodeDR POS (retail POS), KinetiRx (pharmacy management), Zulivio (workforce and CRM), Submify (form backend) and NodeDR Construction ERP.
- What does NodeDR Infotech do?
- NodeDR Infotech builds business software for retail, restaurants, pharmacy, workforce operations, accounting, construction procurement and developer infrastructure.
- How can I contact Raktim Ranjit?
- Use the contact page at raktimranjit.com/contact or email [email protected]. Official social profiles are listed on the links page.
- Where can I see Raktim Ranjit's software projects?
- The projects page has product summaries and case studies covering the problem each product addresses, how it works and the engineering decisions behind it.
- What does Raktim write about?
- His engineering articles and notes cover practical software design, security, data, deployment and lessons from operating production systems. His fiction is listed separately on the Writing page.
- Where can I find Raktim's official profiles?
- The links page collects his official professional and personal profiles, along with links to NodeDR and his software projects.
Get in touch
Have a system that needs careful thinking?
Tell me what the software must do, where the current workflow breaks and what you have already tried. I read messages about engineering, products, writing and photography.