API & Backend Development

APIs, databases, auth, and the plumbing that keeps a product alive at 3am. We design schemas that survive growth, write endpoints that fail loudly instead of silently, and document everything so your next developer isn't lost.

Whether it's the backend for your mobile app, a REST API for partners, or moving off a spreadsheet into a real database, we build production-grade infrastructure without enterprise-grade invoices.

Starting price
from ₹18k negotiable
Typical timeline
2-4 weeks
Get an estimateStart a project
₹18k
starting price, negotiable
Timeline
2-4 weeks
Stack
REST API, PostgreSQL, Supabase, Node.js
Payment
Advance, then milestones
Humanize, FastAPI-backed rewriting pipeline
Built with this: Humanize

What is included

Everything below is part of the quote. Nothing on this list shows up later as an add-on.

REST APIPostgreSQLSupabaseNode.js
  • REST API design and implementation
  • PostgreSQL / Supabase schema design and migrations
  • Authentication: OTP, OAuth, role-based access
  • Real-time data: subscriptions, webhooks, queues
  • Rate limiting, validation, and error handling
  • API documentation your team can actually use

See it built

Live products and client work that used this service. The brief, what shipped, and what it is made of.

FruitPlaza storefront, subscription fruit delivery built by DevLune
FruitPlazaOne backend, four apps, a delivery every weekday.
Humanize, AI text rewriting tool built by DevLune
HumanizeThree passes, so the rewrite never sees the original.
DevLune Webmaster, privacy-first web analytics dashboard
WebmasterCookieless analytics from one script tag.
How a project runs

Four ways in. One studio. One stack.

However you arrive, everything lands on one link, and the same person writes the code that runs it.

How we work, in detail
  1. 2 minEstimatePrice the build yourself. Our fee, third-party costs and monthly running cost, before you share an email.
  2. 24 hBriefTell us what you are building. A proposal and a line-by-line quote land within a day.
  3. one linkProject spaceQuote, agreement, payments, milestones and files. One private link for the whole engagement.
  4. openWork with usDevelopers and designers, paid a share of the project they build.
the middle
DevLune

Sidharth writes the code. No handoff to a team you never meet.

Running on
  • InterfaceNext.js 14 · TypeScriptThe site, the client room and the ops portal. One app, four surfaces.
  • InterfaceKotlin · Jetpack ComposeNative Android. Play Console, signing and store review handled end to end.
  • DataSupabase · PostgresData, auth, file storage and realtime. Row-level security on every table.
  • EdgeCloudflare WorkersScheduled jobs, licence keys, and the MCP server that lets an agent drive a deal.
  • MoneyRazorpay · StripePayments in rupees and internationally. Invoices and receipts issued automatically.
  • MoneyResendEvery email, with delivery, opens and bounces logged back against the deal.

Questions about api & backend development

Short answers. Ask anything else on the estimate page.

Crafted in the dark. Shipped to the world.

Tell us what you are building. You get a private project space with a proposal and a line-by-line quote within a day.

Start a projectsidharth@devlune.in