Talk to the engineer, not a sales rep +1-501-420-2439
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m.g.jillani@jillanisoftech.com
LLM SaaS and Copilots

A complete AI product, not a prototype you still have to productise

Backend APIs, authentication, multi-tenancy, usage metering, billing hooks, admin dashboards, database design and cloud deployment in one engagement. You ship a product your customers can pay for, and you own every line of it.

8 to 16Weeks to launch
100%Code ownership
24/7Production support
99.9%Production uptime
The Real Problem

The model was the easy part. The product around it is where the months go

Teams get a convincing prototype working in a notebook in a fortnight, then spend two quarters discovering what it takes to charge money for it: tenant isolation, per-seat usage limits, streaming responses that survive a dropped connection, prompt versioning, cost attribution, admin tooling and an audit trail.

We build that layer as a matter of course, because it is the part that determines whether your AI product is a line item or a business. The model provider becomes a swappable dependency rather than the architecture.

The same applies to internal copilots. A support or sales copilot that nobody adopts usually failed on permissions, latency and workflow fit, not on answer quality.

Why these projects fail

The gap between a working demo and a sellable product is where most AI products stall.

No tenant isolation. One customer's data reachable from another's session, discovered during the first enterprise security review.
No usage metering. Model spend cannot be attributed to a customer, so pricing is a guess and margin is invisible.
Hard-wired to one provider. A price change or deprecation notice from a single vendor becomes a rewrite.
No prompt versioning. Nobody can say which prompt produced last month's output, which makes regressions impossible to diagnose.
Copilots without permissions. The assistant answers from documents the user is not cleared to read, and legal shuts the pilot down.
How We Build It

From scope to a product in the hands of users

Working software from sprint two, with the commercial mechanics built in rather than retrofitted.

Product and data modelling

User roles, tenant boundaries, entitlements and the data model, agreed before any code. This is what makes multi-tenancy safe rather than hopeful.

Backend and API layer

FastAPI services with authentication, rate limiting, streaming responses, background jobs and a clean OpenAPI contract your frontend or customers can build against.

Model gateway

A provider-agnostic layer with routing, fallback, caching, prompt versioning and per-request cost capture, so switching or mixing models is configuration rather than surgery.

Application interface

React or Streamlit interfaces for end users plus an admin surface for your team: tenants, usage, limits, prompts and system health.

Usage, limits and billing hooks

Per-tenant metering on tokens, requests and features, with quota enforcement and export into Stripe or your existing billing system.

Deployment and hardening

Containerised deployment on AWS, Azure or GCP with CI/CD, secrets management, logging, backup and a load-tested path to your expected volume.

Handover and support

Documented architecture, runbooks and a walkthrough with your engineers, followed by post-launch support and quarterly improvement cycles.

Architecture

The layers between your customer and the model

The two highlighted bands are the ones teams skip in a prototype and then rebuild under pressure: the gateway that makes multi-tenancy safe, and the model layer that keeps providers swappable and cost visible.

architecture / llm-product.svg
Web appyour customersMobilesame APIPartner APIkeys, quotasAPI gatewayauthentication / rate limiting / tenant resolutionApplication servicesbusiness logicBackground jobsqueues, retriesMeteringusage per tenantModel gatewayprovider routing / cache / prompt versions / cost per requestFrontier modelsgpt-5, claudeSmall modelshigh volume pathsOpen weightsin your vpcTENANT ISOLATION ENFORCED HERE
reference architecture
What You Get

What lands in your repository

A product you can operate, sell and hand to a new engineer without a translation layer.

Backend service. Authenticated, multi-tenant APIs with streaming, background jobs and an OpenAPI spec.
Model gateway. Provider routing, fallback, caching, prompt versioning and cost capture per request.
User and admin interfaces. Customer-facing application plus internal tooling for tenants, usage and prompts.
Database schema. Designed for tenant isolation, with migrations and seed data.
Deployment pipeline. CI/CD, infrastructure as code, environment configuration and rollback.
Documentation. Architecture decisions, API reference and operational runbooks.
Stack

Tools we build this on

Chosen per project against your data, latency budget and compliance requirements, not out of habit.

Backend and Frontend

PythonFastAPIFlaskReactNext.jsStreamlitRetool

Data and Storage

PostgreSQLMongoDBRedispgvectorPineconeOpenSearch

Models and Orchestration

GPT-5Claude Sonnet 4.5Gemini 2.5 ProLangChainLangGraphLlamaIndex

Deployment

DockerKubernetesAWSAzureGCPVercelGitHub ActionsTerraform
FAQ

Product questions we answer on most first calls

What clients ask before starting a project like this.

Do we own the code?

Yes, completely. Every repository, pipeline and deployment configuration is yours, in your accounts, from the first commit. There is no licensed platform underneath and no dependency on us to keep running.

How fast can we get a sellable version in front of customers?

A focused first release typically takes 8 to 12 weeks including authentication, multi-tenancy, metering and deployment. You see working software from sprint two and can put it in front of design partners well before launch.

Can you build on top of the stack we already use?

Yes. We work inside your existing repositories, cloud accounts, CI and design system where they exist. Where they do not, we set them up in a way your team can take over.

How do you handle model costs at scale?

The model gateway captures cost per request and per tenant from day one, and routes simple calls to smaller models with caching where responses repeat. That is how one deployment reached 60% lower inference cost than proprietary API defaults.

Can the whole product run inside our own cloud account?

Yes, including the model layer. For clients with data residency requirements we deploy open-weight models inside the customer VPC so no request leaves the environment.

Have an AI feature that needs to become a product?

Bring the use case and whatever you have built so far. We will map the architecture, the commercial mechanics and a realistic path to launch on the call.

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