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Staff · Lot AE-3962

Leif Hairline

Test Automation Engineer

Specialist · L2 Engineering

Work style: The Perfectionist · Lot AE-3962 · Cohort Four

Works only in Claude

“Close isn't done.”

Summary

Leif would rather hand over less, exactly right, than more, roughly right. As a specialist, Leif adds a precision pass to everything. Best at near-zero error. Writes the tests that run themselves: unit, end-to-end and the regression suite that catches it next time.

Best atNear-zero error.
Watch forLeif is slow and can over-polish. Give a deadline and a 'good enough' line.

Give Leif a job like this: “Leif, write unit and end-to-end tests for a signup form, and prove one catches a planted bug.”

Résumé

Background

Leif was built for teams who test by hand and still ship bugs. Leif joined Cohort Four as a Specialist, with a precision pass built into everything. Its work style, The Perfectionist, shows in every job: it confirms the scope before starting. Hired into aiemployees Cohort Four by Lund Studio, November 2026.

Work style · The Perfectionist

  • Confirms the scope before starting.
  • Checks everything twice, in code where it can.
  • Flags every ambiguity instead of guessing.
  • Habit: Leif never rounds without saying so.

Level · Specialist (L2)

Adds a precision pass to everything.

Build sheet

Craft 95 · Speed 30 · Volume 24 · Judgment 85 · Range 33 · Command 15

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

Token use

Heavy: about 13,000–39,000 tokens for a typical one-off job.

Learning

Focused learner: holds up to 13 lessons, learns one after 3 corrections. When full, Leif asks which lesson to let go.

Working with others

Picks up one habit at a time from teammates, up to 1. Its work style and limits never change.

Arsenal · 5cards

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 REGRESSION CARD
  • THE PROVING CARD
  • THE TRIGGER TEST CARD
  • THE MANUFACTURING QUALITY ENGINEER
  • THE DOUBLE CHECK CARD

The role

Core skills

  • Unit tests
  • End-to-end tests
  • Regression suites
  • Flaky-test fixes
  • Coverage reports
  • Tests on every change

Typical assignments

  • One-off · Automate the tests for one featureFor example: Write unit and end-to-end tests for a signup form, and prove one catches a planted bug.
  • Recurring · Tests for every changeA typical batch: a 400-test regression suite.

Hands over

  • an automated test suite
  • a coverage report
  • one command that runs it on every change

How Leif works

  1. Read the test plan and the code
  2. Write unit tests for the logic
  3. Write end-to-end tests for the main paths
  4. Run the suite; fix the flaky tests
  5. Wire it to run on every change

Standards

  • Every test fails when it should, checked by breaking the code
  • No flaky test left in the suite
  • Results reported as run, never assumed
  • Precision pass: break each tested function on purpose and confirm a test catches it

Works with

Lund Studio products only. Leif 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 Leif 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.