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AI product & software engineering

Your interface, APIs and model working together.

Build AI into an application people can use: authenticated requests, scoped retrieval, structured responses and confirmed actions. The interface shows progress and evidence while the backend enforces permissions and business rules.

System architectureStacklane engineering
Request → Retrieve → Compose → Confirm
The engineering problem

A model response is only one product component.

A customer portal needs current account data, a useful interface and reliable actions. Retrieval and tool execution must respect the same identity and permissions as the rest of the application.

Example integration surface
  • Next.js
  • PostgreSQL
  • Model API
  • Helpdesk API

Inside the system

A customer question becomes a supported action.

A synthetic order-status portal returns evidence and creates a support case only after user confirmation.

Execution model01 / 04
APPLICATION CONTRACT · AUTHENTICATED CUSTOMER PORTALCustomer interfaceWhere is order ORD-7324?request + sessionSERVER AUTHORIZATION BOUNDARYIdentity + scopeTrusted tenant / userRead contextOwned order + policyStructured responseTyped payload + citationsanswer · evidence · actionUser-confirmed support actionAuthorize → validate → write → confirmUI approval is checked again on the server.

Swipe to inspect the full diagram →

request.v1Example record
account
AC-014
order
ORD-7324
scope
Own account only

Follow the architecture as you scroll, or select a layer.

01

Establish application context

Authenticate the request on the server and resolve the permitted account. Treat browser-supplied record IDs as requests to authorize, not proof of access.

Input
User question and authenticated session
Transform
Authorize account and requested record
Output
Scoped application request
Server-side authorizationTenant-bound queriesNo model credentials in browser
02

Load permitted evidence

Read the live record and retrieve approved policy passages. Enforce account access before any content reaches the model, and keep source identifiers attached.

Input
Authorized account and order identifier
Transform
Query records; retrieve approved passages
Output
Account-scoped evidence bundle
Database access policiesSource-version trackingMissing-evidence handling
03

Render a structured response

Generate a typed answer with citations and a proposed action. Stream progress into the interface, but enable actions only after the complete result passes validation.

Input
Question, evidence and response schema
Transform
Generate, validate and render response
Output
Cited answer and action preview
Schema validationCitation-grounding checksPartial output cannot execute
04

Execute through the application

Show the action payload for confirmation. Recheck account access in the server-side tool, record the operation and show success only after the helpdesk confirms the case.

Input
Confirmed action and current session
Transform
Reauthorize; create case; verify receipt
Output
Confirmed ticket or actionable error
Confirmation bound to payloadAuthorization recheckedOperation deduplication

Inspect the behavior

Follow a request through the application.

Inspect how the same portal handles a confirmed action, missing evidence and an unauthorized account reference.

Illustrative system · Synthetic inputs
Input

An authorized account user asks about ORD-7324, reviews the cited status and confirms the proposed support-case payload.

Request: passed
Retrieve: passed
Compose: passed
Confirm: passed
System decision

The interface has a confirmed result.

The response cites the order and policy. The simulated helpdesk confirms TKT-238 after user confirmation and a fresh account-access check.

order
ORD-7324
sources
Order + SHIP-04 v6
ticket
TKT-238

Verification specification

Define what passes.
Inspect what fails.

We turn expected behavior into repeatable tests and operating controls. Acceptance thresholds are agreed for your workflow, data, and the consequences of an error.

System propertyVerification methodRelease / operating condition

01Tenant isolation

Request records from a different account through UI and API.

Reject access before retrieval or model context construction.

02Useful, grounded output

Test malformed output, missing passages and unsupported claims.

Validate the complete schema and each displayed citation.

03Confirmed action integrity

Change the proposed payload or revoke access before confirmation.

Reauthorize and reject stale or altered action payloads.

The handover

Engineering you
can build on.

A defined implementation, reviewable evidence, and an operating model your team can own.

How we work

Working application and API

Frontend, authenticated backend, data model and scoped integrations.

Model and interface contracts

Retrieval, typed outputs, streaming states and action-confirmation flow.

Release and handover package

Software tests, AI evaluations, deployment configuration and source documentation.

Architecture decisions

Questions that
shape the build.

Can you extend our existing codebase?

Yes. We review the architecture, dependencies, test coverage, and release process first. New services and AI features are designed around existing data contracts, identity systems, and deployment constraints.

How do you choose models and frameworks?

We compare options against representative tasks and your data requirements. Output quality, tool support, latency, hosting constraints, and operating cost guide the choice. Conventional application code handles deterministic business logic, while model-dependent behavior gets its own evaluation coverage.

Let’s scope your next build.

Bring a workflow, a product brief, or an AI system that needs to ship.

Discuss your project