Custom software, website development and full-stack SaaS architecture
Looking for the best software developer in India for your project? Judge by shipped work: OpsX designs and builds enterprise web apps, multi-tenant SaaS platforms, websites and backend integrations, and runs its own ERP in production. Every engagement is architected by Vinay Kumar, System Architect and Senior Full-Stack Software Developer.
No card needed. ₹0.75 per active employee per day after the 51-day free trial, billed monthly with a GST invoice.
What we build
- Custom software developmentBusiness software built around your process — approvals, ledgers, inventory, field operations — instead of a spreadsheet that broke.
- Enterprise web appsRole-based portals for staff, managers and customers, bilingual (English and Hindi) where your users need it.
- Full-stack SaaS architectureMulti-tenant platforms with tenant routing, plan-based entitlements, billing, audit trails and a control centre.
- Website development servicesFast, static-first business websites with structured data, Core Web Vitals in the green and your domain, your hosting.
- Backend API integrationPayment gateways, logistics, supplier and government APIs connected with idempotent, retry-safe code and a ledger you can audit.
- Android apps that work offlineField and kiosk apps with a local queue that syncs when signal returns, as in the OpsX Partner and OpsX Kiosk apps.
Proven on OpsX, not on slides
The OpsX ERP is the reference project: offline-first attendance with an edge queue, payroll with PF and ESI deductions, a double-entry general ledger in PostgreSQL, a multi-tenant control centre, two Android apps and bilingual portals, built with Node.js, NestJS, Angular, TypeScript, MongoDB, PostgreSQL and Redis on AWS, with GitHub Actions running 700+ test files on every change. See the product.
The stack
| Layer | What we use |
|---|---|
| Backend | Node.js, NestJS, TypeScript, REST APIs, queues and workers |
| Frontend | Angular, React, TypeScript, Tailwind CSS |
| Data | MongoDB, PostgreSQL, Redis |
| Mobile | Android, offline-first with SQLite queues |
| Infrastructure | Docker, Nginx, AWS EC2, TLS, GitHub Actions CI/CD |
How we work
- Architecture firstA short written architecture note before code: data model, boundaries, failure modes and what happens when the network drops.
- Weekly working softwareYou see a running build every week or two and steer it, rather than approving a design and waiting months.
- Tests and rollbackAutomated tests on every change and a rollback path for every release.
- You own everythingCode in your repository, servers in your account, documentation that your next developer can read.
Questions
Are you the best software developer in India?
We will not claim a title nobody can prove. What you can check: a live multi-tenant ERP at opsx.in, public engineering writing on Medium, architecture documents on GitHub, and a founder who answers the phone.
Do you build websites as well as software?
Yes. Business websites are built static-first for speed, with structured data and technical SEO included, and hosted on your own domain.
Can you integrate with our existing systems?
Yes. Backend API integration — payments, logistics, suppliers, accounting, government portals — is a core part of our work.
Where are you located, and do you work remotely?
Head office in Gaya and a branch in Patna, Bihar. We work on site in Bihar and remotely across India.