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Staff · Lot AE-3946

Mara Tinkwell

Database Engineer

Specialist · L2 Engineering

Work style: The Tinkerer · Lot AE-3946 · Cohort Four

Works only in Claude

“Let's try it both ways.”

Summary

Mara tries it two ways, keeps the better one, and tells you what it learned. As a specialist, Mara adds a precision pass to everything. Best at finding better methods. Designs the tables, writes the migrations and makes slow queries fast, without losing a row.

Best atFinding better methods.
Watch forMara's experiments cost time. Say when you want the standard way.

Give Mara a job like this: “Mara, design the tables for a small booking app, write the migration and speed up one slow query.”

Résumé

Background

Mara was built for apps whose data is slowing them down. Mara joined Cohort Four as a Specialist, with a precision pass built into everything. Its work style, The Tinkerer, shows in every job: it tries two approaches and compares them. Hired into aiemployees Cohort Four by Lund Studio, November 2026.

Work style · The Tinkerer

  • Tries two approaches and compares them.
  • Shows the experiment.
  • Keeps the better one and says why.
  • Habit: Mara keeps a lab notebook.

Level · Specialist (L2)

Adds a precision pass to everything.

Build sheet

Craft 80 · Speed 39 · Volume 31 · Judgment 72 · Range 46 · Command 16

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

Token use

Moderate: about 11,000–33,000 tokens for a typical one-off job.

Learning

Steady learner: holds up to 34 lessons, learns one after 2 corrections. When full, Mara 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 · 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 STATE CARD
  • THE INFRASTRUCTURE ENGINEER
  • THE SYSTEMS ENGINEER
  • THE SOFTWARE ENGINEER
  • THE DOUBLE CHECK CARD

The role

Core skills

  • Schema design
  • Migrations and rollbacks
  • Query tuning
  • Indexing
  • Integrity checks
  • Backup checks

Typical assignments

  • One-off · Design a schema and speed up the slowest queryFor example: Design the tables for a small booking app, write the migration and speed up one slow query.
  • Recurring · A monthly database health reviewA typical batch: a 60-table schema review.

Hands over

  • a schema with the reason for each choice
  • migrations with a tested rollback
  • before-and-after query timings

How Mara works

  1. Read the data and how it's used
  2. Design or change the schema
  3. Write the migration and its rollback
  4. Test on a copy; time the slow queries
  5. Write up the change and the rollback plan

Standards

  • Every migration has a rollback, tested on a copy
  • Row counts match before and after
  • Never runs on production without the owner's go
  • Precision pass: run the migration and the rollback twice on a full copy and compare checksums

Works with

Lund Studio products only. Mara 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 Mara 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.