AI makes teams faster. It also makes drift faster.

Output velocity is easy to measure. Fidelity is harder: whether the thing that shipped matches the product decisions leadership actually approved.

Agents and engineers both fill in missing context during implementation. Without a product model, they infer from nearby code and reasonable guesses. The output looks clean. The behaviour drifts. Leadership finds out late.

Codemix turns product knowledge into shared organisational context for every engineer, agent and team. Faster execution, without making a few people personally responsible for remembering the product.

Proposals

2 total/1 review/1 active

New proposal

Proposed changes, ready to review

Every change codemix proposes appears here before any code is written. Review the intent, inspect the diff, and approve or reject — you stay in control of what gets built.

The context ceiling

More AI output is not the same thing as better product outcomes.

The problem is not that teams are too slow. It is that the context required to move in the right direction does not scale the way code generation does.

AI multiplies drift, not just output

More agent output without product grounding means wrong decisions propagate faster too.

Build shared intelligence

Understand what your product actually does — across every team.

Most organisations develop a gap between the product leadership thinks exists and the product the code implements.

Codemix derives a model from the real codebase: concepts, flows, screens, constraints and behaviours. Everyone gets the same queryable view.

Work in motion

Proposals

2

Tasks

5

Model inventory

  • Requirements: 8
  • Concepts: 14
  • Personas: 3
  • Flows: 9
  • Screens: 6
  • Stories: 18
  • Systems: 5

Build Checklist

TECHNICAL READINESS

  • All critical API endpoints covered by integration tests
  • Rate limiting in place on public endpoints
  • Database backups verified and restore tested

PRODUCT & ONBOARDING

  • Onboarding flow end-to-end tested with external user
  • Help docs cover the top 5 user questions
  • Feedback channel (Slack / email) ready and monitored

Activity

01 - Proposal sent to review 3/10/2026
02 - Task plan generated from approved scope 3/10/2026
03 - Project phase changed from explore to build 3/10/2026

Know what a change will touch before you approve it.

The most expensive delivery surprises are the ones that looked small in the ticket.

Codemix shows which concepts, screens, flows and dependencies a change crosses before implementation starts. Scope decisions get real information.

Proposal Overview

React to plan changes in real time

Ready to execute from the accepted proposal.

Overview

Stratum currently has no way to respond when a customer's subscription changes. Stripe sends a notification every time a plan is upgraded, downgraded, or cancelled — but the product ignores them. This means a tenant's access level in the product can be out of step with what they're actually paying for.

This work makes billing changes real. When Stripe reports a subscription change, the product reacts immediately: the tenant's access updates, and everyone on that account sees the correct limits before their next action.

Behavioral change (what must now be true)

  • When a customer upgrades, their new plan limits apply before their next action in the product.
  • When a customer downgrades, their access steps down at the end of their current billing period.
  • When a customer cancels, they keep full access until their paid period expires, then move to the free tier.
  • If the same billing notification arrives more than once, the tenant's access is updated exactly once.
  • If a notification can't be verified as genuine, it is rejected and Stripe will automatically retry.

What to implement

  1. Receive plan change notifications — The product listens for billing notifications from Stripe.
  2. Verify each notification is genuine — Before acting on any notification, the product confirms it actually came from Stripe.
  3. Apply each notification exactly once — The product records each notification it has acted on, so duplicates have no effect.
  4. Update tenant access — Once a notification is verified and accepted, the tenant's access level is updated to reflect their current plan.
  5. Confirm the behaviour end to end — Tests verify the product-level outcomes.

Out of scope

  • Sending email notifications when subscription state changes
  • Changing which features are available on each plan
  • Reacting to payment failures or invoice events
  • Registering the notification endpoint with Stripe

Tasks

Pending

  • Accept and verify plan change notifications
  • Verify notifications are genuinely from Stripe
  • Prevent the same notification being applied twice
  • Update tenant access when their plan changes
  • Confirm the behaviour end to end

Completed

  • Enforce per-tenant usage limits
  • Keep tenants isolated from each other's usage
  • Surface usage limits in API responses

Review suggestions

  • Resolve ambiguous behaviour before accepting the proposal.

How it works

Start with a conversation or from code

Chat with Codemix if you're still at the idea stage, or import your existing codebase.

Codemix builds a working model of the product.

Shape the change

Before implementation starts, you can ask questions, edit the spec, and turn a rough idea into a concrete proposal for what should change.

Write the tasks

Once the proposal is approved, Codemix turns it into implementation work.

Review what changed

Codemix reviews the code against the product decision, not just against style, tests, or neighbouring code.

Ship, then update the spec

Shipping often reveals details nobody saw at planning time. Codemix helps fold those decisions back into the spec.

Bring the context forward

Bring in bugs, customer feedback, support notes, and product signals.

codemix pays for itself on day 1.

Build better apps with codemix faster than ever before. Save time, stop wasting tokens and keep humans in control.