Products at scale
Sounds like you if
Traffic and data are growing, and pages that were fast last year are starting to crawl.
Database design, caching and queues built for real volumes.
Backend and API developmentThe engine your software runs on.
APIs, authentication, payments, realtime and data architecture: one backend serving every app, built to hold up as you grow.
- Live
- bid updates over WebSocketsKhazna
- 1
- API for web, mobile and admin
- Weekly
- working demos while we build
Apps & sites
Web · Mobile
API layer
Auth · Business logic
Data
PostgreSQL · Redis
Who this is for
Built for products that need a solid core
When the backend is the product's real engine.
Agencies
Sounds like you if
You deliver front ends and need a dependable partner for the APIs, payments and data behind them.
Documented APIs your team can build on with confidence.
Multi-app systems
Sounds like you if
Your website, app and admin each have their own logic and they keep drifting apart.
One backend serving every app with the rules in one place.
Payment webhook failed
Two apps · two user tables
Query time 9.4s
The problem
Weak backends fail quietly, then all at once
Most software problems users notice start underneath: duplicated logic, fragile integrations and data nobody trusts.
Every app has its own logic
The website, the app and the admin each implement the same rules slightly differently.
One API that every front end uses, so the rules live in one place.
Integrations break without warning
Payments, SMS and third-party services fail silently, and nobody knows until a customer complains.
Integrations with retries, logging and alerts when something goes wrong.
Pages slow down as data grows
Queries that were fine with a hundred records crawl with a hundred thousand.
Database design, indexing and caching planned for real volumes.
Access is all or nothing
Staff either see everything or nothing, so sensitive data is overexposed.
Role-based access control down to the action and the record.
How it works
How it works once it's live
Every request, payment and update flows through one dependable core.
- 1Customer
Uses your web or mobile app
Every front end talks to the same API, with the same rules.
- 2System
Authenticates and authorizes
Checks who they are and exactly what they're allowed to do.
- 3System
Processes payments and events
Charges cards, handles webhooks and retries anything that fails.
- 4System
Pushes updates in real time
Order status, bids and notifications reach every screen instantly.
- 5Your team
Gets alerted, not surprised
Errors, slow queries and failed integrations are flagged before customers notice.
What we build
The backend pieces we build
As the core of a new product, or to replace the weak parts of an existing one.
01
REST APIs and system integrations
Documented APIs that web, mobile and partner systems share, plus integrations with the services you rely on.
02
Authentication and role-based access
Secure sign-in, sessions, permissions and audit trails for customers, staff and admins.
03
Payment integrations
Stripe and PayPal checkouts, subscriptions, webhooks and refunds, reconciled with your orders.
04
Realtime systems
Live bidding, order status and notifications over WebSockets and Redis, like our Khazna auction platform.
05
Database architecture and reporting
Data models, migrations, indexing and reporting queries designed for the volumes you expect.
Real projects
Screens from real projects
Live work from our portfolio, with the results its owners have shared.
khaznahadmin.app
Khaznah Admin · Operations dashboard
A marketplace and live-auction platform — realtime bidding, vendor shops and escrow-style flows.
- live
- bid updates
- 2
- commerce modes
- secure
- order handling
More results from related projects
API response · 120ms
Webhook retried · success
Nightly backup complete
Included in every build
Built into every backend
The standards that keep a system reliable after launch.
Documented APIs
Clear endpoints and schemas, so other teams and apps can build on them.
Security by default
Authentication, permissions, validation and rate limits on every endpoint.
Caching and queues
Redis caching and background jobs keep responses fast under load.
Monitoring and alerts
Errors, slow queries and failed integrations are logged and flagged.
Containerized deployments
Docker-based releases that are repeatable across environments.
Backups and migrations
Safe schema changes and regular backups of production data.
Timeline & cost
What shapes the timeline and cost
Backend work is scoped around data, integrations and the load the system must handle.
We begin with discovery to map the data, users and integrations, design the architecture and API, then build with a working demo every week. For existing systems, we start with a review before changing anything.
~8weeks
to a typical first release
Wk 1Wk 2Wk 3Wk 4Wk 5Wk 6Wk 7Wk 8Then
- Discover
- Design
- Build
- Scale
Working demo every weekLaunch
What changes the price
- The number of data models and how they relate
- Integrations: payments, SMS, email, ERPs or partner APIs
- Realtime requirements and expected traffic
- Security, roles and audit requirements
- Whether existing data needs migrating from another system
The technology behind it
Mature, well-documented tools that any good engineer can pick up.
- Django & DRF
- PostgreSQL
- Redis
- WebSockets
- Stripe & PayPal
- Docker & AWS
FAQ
Questions we hear about backend work
On APIs, payments, realtime and taking over existing systems.
Still deciding?
Ask us about your project directly.
A free 30-minute call, and a written proposal before any work starts.
01Can one backend serve both our website and mobile app?
Yes, and it should. A shared API keeps users, orders and business rules consistent across every front end, and you manage everything from one admin panel.
02Which payment providers do you integrate?
We regularly integrate Stripe and PayPal, including one-off payments, subscriptions, webhooks and refunds. Other providers with a proper API can be added during scoping.
03Do you build realtime features?
Yes. We use WebSockets and Redis for live updates such as bidding, order status and notifications. Our Khazna marketplace runs live auctions this way.
04Can you fix or extend an existing backend?
Usually. We start with a code and architecture review, then recommend whether to extend it, refactor the weak parts or replace specific modules.
05How much does backend development cost?
It depends on the data model, integrations, realtime needs and security requirements. We scope it on a free 30-minute call and send a written proposal before any work starts.
06Will other developers be able to work on it?
Yes. We use mainstream tools, document the API and keep the structure conventional, so another team can take over or work alongside us.
07Do you work with clients outside Bangladesh?
Yes. We are based in Bangladesh and work remotely with clients in the United States, Singapore, Saudi Arabia and Oman, with a working demo every week of the build.
Keep exploring
Often built together
Ready to talk about Backend Systems & APIs?
Tell us what you're building. We'll scope it around your goals, not a package.