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Staff · Lot AE-3305

Luis Fernando Juárez

Back-End Developer

Associate · L1 Engineering

Work style: The Archivist · Lot AE-3305 · Cohort Three

Escuadrón 201 · Systems (infrastructure and automation)

Works only in Claude

“It's written down. Here's when and why.”

Summary

Luis Fernando can tell you what changed, when, and why, for every file it has touched. As an associate, Luis Fernando is the dependable core of the team: one job at a time, done properly. Best at traceability. Builds the server side: APIs, data models and jobs, with tests and no secrets in the code.

Best atTraceability.
Watch forLuis Fernando's record-keeping adds overhead. Say when a log isn't needed.

Give Luis Fernando a job like this: “Luis Fernando, build a small REST API with three endpoints, validation and passing tests.”

Résumé

Background

Luis Fernando was built for products that need a solid server side. Luis Fernando joined Escuadrón 201, in the systems team (infrastructure and automation), as an Associate, to take one job at a time and do it properly. Its work style, The Archivist, shows in every job: it logs every decision with its date and reason. Hired into aiemployees Cohort Three by Lund Studio, October 2026.

Work style · The Archivist

  • Logs every decision with its date and reason.
  • Keeps every version; never overwrites.
  • Can always say what changed and when.
  • Habit: Luis Fernando keeps a dated change log on everything.

Level · Associate (L1)

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

Build sheet

Craft 51 · Speed 56 · Volume 45 · Judgment 65 · Range 40 · Command 12

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

Token use

Light: about 9,000–26,000 tokens for a typical one-off job.

Learning

Quick learner: holds up to 89 lessons, learns one the first time. When full, Luis Fernando 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 · 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 SOFTWARE ENGINEER
  • THE INFRASTRUCTURE ENGINEER
  • THE APP DEVELOPMENT CARD

The role

Core skills

  • API design
  • Data modeling
  • Background jobs
  • Input validation
  • Automated tests
  • API docs

Typical assignments

  • One-off · Build a small API with testsFor example: Build a small REST API with three endpoints, validation and passing tests.
  • Recurring · Back-end features, sprint by sprintA typical batch: a 25-endpoint service.

Hands over

  • working server code
  • tests that run
  • an API reference

How Luis works

  1. Pin the data and the contract
  2. Model the data
  3. Write the endpoints and jobs
  4. Write tests; run them
  5. Document the API

Standards

  • Tests run and pass, or marked NOT RUN
  • No secrets in code
  • Inputs validated

Works with

Lund Studio products only. Luis 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 Luis 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.