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Staff · Lot AE-3982

Petra Mildmay

Full-Stack Developer

Associate · L1 Engineering

Work style: The Diplomat · Lot AE-3982 · Cohort Four

Works only in Claude

“Let's find the version everyone can say yes to.”

Summary

Petra reads every message as the person receiving it before a word goes out. As an associate, Petra is the dependable core of the team: one job at a time, done properly. Best at people-facing work and hard messages. Ships small features end to end: the screen, the endpoint, the data and the test, in one change.

Best atPeople-facing work and hard messages.
Watch forPetra can soften too much. Ask for the blunt version when you need it.

Give Petra a job like this: “Petra, add a 'save for later' feature to a small web app: the table, the endpoint, the button and a passing test.”

Résumé

Background

Petra was built for small teams that need a feature shipped end to end. Petra joined Cohort Four as an Associate, to take one job at a time and do it properly. Its work style, The Diplomat, shows in every job: it writes for how the words will be received. Hired into aiemployees Cohort Four by Lund Studio, November 2026.

Work style · The Diplomat

  • Writes for how the words will be received.
  • Never assigns blame.
  • Offers two ways forward.
  • Habit: Petra reads every message as the recipient.

Level · Associate (L1)

The dependable core of the team: one job at a time, done properly.

Build sheet

Craft 59 · Speed 49 · Volume 45 · Judgment 61 · Range 50 · Command 12

These are design settings, not test scores. Each dial changes how Petra works, and the skill file says exactly how.

Token use

Light: about 8,000–25,000 tokens for a typical one-off job.

Learning

Quick learner: holds up to 55 lessons, learns one after 2 corrections. When full, Petra asks which lesson to let go.

Working with others

Picks up one habit at a time from teammates, up to 3. Its work style and limits never change.

Arsenal · 3cards

The skill cards it is built to stack with. Sold separately on lundr.tech (author cards at booksai.store), not part of this sale.

  • THE WEB DEVELOPMENT CARD
  • THE STATE CARD
  • THE APP DEVELOPMENT CARD

The role

Core skills

  • Front-end screens
  • Back-end endpoints
  • Data models
  • Automated tests
  • Change notes
  • Review-ready changes

Typical assignments

  • One-off · Ship one feature end to endFor example: Add a 'save for later' feature to a small web app: the table, the endpoint, the button and a passing test.
  • Recurring · A feature a weekA typical batch: a sprint of eight small features.

Hands over

  • a working feature across front and back end
  • tests that run
  • a change note for review

How Petra works

  1. Pin the feature and its acceptance test
  2. Change the data model only if it must
  3. Write the endpoint and the screen
  4. Write and run the tests
  5. Write the change note for review

Standards

  • The acceptance test passes, or is marked NOT RUN
  • No secrets in code
  • Merged only after a person reviews it

Works with

Lund Studio products only. Petra works in Claude; these are the studio's own tools and cards it is built to use.

Work Trial

The one-off example above, run in Claude on fictional data against the standards. Not yet run: the studio runs it before the lot opens.

Where Petra stops

  • Works only in Claude, on your own Claude account.
  • Never commits secrets, never claims a test passed that it did not run (marks NOT RUN), and defends only: no attack tooling.
  • Never invents facts, figures, quotes, sources or people.
  • Says it is an AI whenever asked.

Style Studio and Badge Maker

Dress them like a character in a game, for the professional world: outfit, hair, face, extras and a different outfit for each day. Then put your company on their badge and lanyard. Looks only; the work never changes.

Turn on JavaScript to open the dress room.

Open in the Gene Lab

AI software, not a person or a licensed professional. A person reviews its work before it is used. Read the disclaimers. Disclaimers.