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Build a product

Add AI features to the product you already run

We build AI-powered search, summaries, recommendations and assistants into software you already run, with permissions, evaluation and cost controls around each.

In short

AI features in your product means adding capabilities such as intelligent search, summarization or a conversational interface to software you already operate. Requests pass through an AI gateway that applies permissions, tenant isolation and limits, and each feature is evaluated for quality, latency and cost before release.

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01 The problem

What problem does this solve?

A product team may want smarter search, summaries or an assistant inside the product. Adding one is more than calling a model. It has to respect each customer's data, behave predictably, and not make the product slower or costlier to run.

Without testing, it is hard to know whether a new feature is good enough to ship, or whether the next change makes it worse. What each request costs also needs to be understood before the feature is offered widely.

02 What we build

What do we build?

  • AI features designed into your existing user experience
  • An AI gateway for model routing, limits and request validation
  • Retrieval from your own data where a feature needs context
  • Tenant isolation and permission checks on every request
  • Versioned prompts and configuration
  • Quality regression tests and evaluation before each release
  • Monitoring of latency, usage and cost per task

03 Architecture

What does a typical architecture look like?

Typical architecture of AI features in a product The flow runs from top to bottom. Your product: Existing app and APIs, User permissions. AI gateway: Model routing and limits, Request validation, Usage monitoring. Context: Retrieval from your data, Prompt and config versions. Models: Hosted foundation models, Structured outputs. Evaluation: Quality regression tests, Latency and cost per task. Tenant isolation and audit trails. YOUR PRODUCT Existing app and APIs User permissions AI GATEWAY Model routing and limits Request validation Usage monitoring CONTEXT Retrieval from your data Prompt and config versions MODELS Hosted foundation models Structured outputs EVALUATION Quality regression tests Latency and cost per task Tenant isolation and audit trails
Requests from your product pass through an AI gateway that applies limits and checks, draw on your data for context, and are evaluated for quality and cost.

04 How it goes

How does the work usually go?

  1. Choose the feature worth building

    We prioritize candidate features by user value and feasibility, and we say so if conventional software or automation would serve the need more reliably.

  2. Prove it on a bounded pilot

    A time-boxed pilot tests the feature on representative cases, with success criteria agreed in advance. It ends in a decision to proceed, revise or stop.

  3. Build it behind a gateway

    We integrate the feature through an AI gateway with permissions, tenant isolation and request validation, so model access is controlled in one place.

  4. Evaluate before release

    We test outputs against representative cases and failure scenarios, and define acceptance thresholds before deployment.

  5. Release and keep measuring

    After release we monitor quality, latency and cost per task, and evaluate again as models, prompts and data change.

Talk through an AI idea

30 minutes, video call. Prefer to write? Send a message

05 Capabilities and stack

Which capabilities and technologies are involved?

  • Python
  • FastAPI
  • LangChain
  • LangGraph
  • React
  • TypeScript
  • Amazon Bedrock
  • Google Vertex AI
  • PostgreSQL with pgvector

The final stack follows your requirements and what you already run. How we choose technology

06 A typical situation

What does this usually look like?

A software company wants to offer summarization or intelligent search inside its product, but each customer must see only their own data, and the cost of every request has to stay visible.

We start with a bounded pilot on one feature, build it behind a gateway that enforces tenant isolation, and evaluate it against agreed test cases before it reaches customers.

07 Questions

Questions people ask

No. AI could help in some places, but conventional automation may be more appropriate. We check whether a feature needs AI at all, and we say so if a simpler approach would be more reliable.

Identity, permissions and tenant isolation are enforced before retrieval and before any request reaches the model, and unauthorized disclosure is part of the evaluation. The details depend on how your product stores its data.

The gateway applies rate limits and usage monitoring, and we track latency and cost per successful task from the first release. Those become the baselines to compare against before any benefit is claimed.

08 Who it suits

Who does this suit?

Talk through an AI idea

Start with the business problem. We will help you decide whether AI fits, what a first version could look like, and when simpler automation is the better answer.

30 minutes, video call. Prefer to write? Send a message

What happens next

  1. You pick a time, or send us a message.
  2. A person at Nexstella reads what you shared before we talk.
  3. You leave with a clear next step, even when that step is to wait.