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eleventh.

// build

Agency Backend Build

The AI backend your agency sells, built and shipped under your brand and your delivery model.

For agencies and studios that win AI work and need the backend delivered reliably without hiring a full AI team.

$8,000 – $18,0003-6 weeks, milestone-based · Scoped by complexity, number of integrations, and depth of evaluation.
Brief us · 24h response
You keep the client and the front end. We build the backend beneath your brand.

// what you get

The deliverables, in writing.

  1. A backend built to your spec

    A retrieval, agent, or LLM-API backend on FastAPI or Node, with the vector store, auth, rate limits, and cost controls a real client load needs.

  2. Evaluation and observability built in

    Quality measured against a labeled set and visible in telemetry, so you can defend the system to your client with numbers instead of adjectives.

  3. White-label delivery

    The work ships in your repository under your brand. We can stay fully behind your team, or join client calls, whichever you prefer.

  4. Fixed scope and milestones

    A locked scope and a milestone schedule, so you can quote your client a date and a price with confidence.

  5. Documentation and handoff

    A handoff your team can maintain, or an ongoing support arrangement if you would rather we stay on the system.

// what it costs

$8,000 – $18,000

Scoped by complexity, number of integrations, and depth of evaluation.

What the fee covers

  • Design, build, evaluation, deploy, and handoff for one backend
  • Integration with your existing front-end
  • White-label delivery in your repository
  • A fixed scope and milestone schedule

What it does not

  • Front-end build (we integrate with yours)
  • Ongoing retainer (optional, arranged separately after handoff)
  • Client-facing project management beyond the agreed scope

// how it runs

3-6 weeks, milestone-based.

  1. Week 1

    Scope lock. We turn the client requirement into a fixed spec, a milestone schedule, and a price you can quote.

  2. Weeks 2-5

    Build. The backend, the evaluation harness, and the observability, delivered against the milestones in your repository.

  3. Final week

    Handoff. Documentation, a walkthrough, and either a clean handoff to your team or the start of a support arrangement.

// what you bring

Four things, and we can start.

  • The client requirement or specification
  • Your repository and deploy target
  • A technical point of contact on your side
  • Your brand assets, if you want the work white-labeled

// questions

Before you brief us.

Your call. We can stay fully behind your brand and never appear, or join technical calls as part of your team. Either way, the work ships under your name.

// past delivery

The work this is built on.

// what's real

You sell the AI capability, we ship the backend behind your brand, and your client gets a system that survives their users.

Ready when you are.

Brief us · 24h response

// we reply within 24 hours