Cover letter: 1 page, 270 words, 3 paragraphs, validator PASS. Carries
the one thing the resume structurally cannot - why a Swisscom data
engineer credibly wants a research-platform seat at a market maker,
which against an ex-FAANG field is the main differentiator.
Deliberately uses no external hooks. cl_reference.md says to omit an
unnecessary hook rather than spend words proving company familiarity, so
the only hook is the JD's own language, scraped verbatim and first-party.
No named executives: nothing to verify, and nothing that reads as
name-dropping. The letter also states the R1 gap plainly rather than
hiding it, because a technical reviewer will find it in the first
question anyway and owning it is stronger than being caught by it.
PP-1 appears with its personal-project label and an explicit "I make no
claims for its results".
Separately, loading the bundles for this letter surfaced two live scope
traps. The 2026-08-21 correction that fixed the SW-1 violation in
bundle_data_engineer.md ended with "check the other four bundles for the
same pattern". That sweep was never done, and two of them carried it:
bundle_data_platform.md - the S5 cover-letter hook read "migrating
Swisscom's legacy ETL stack to a cloud-native AWS platform", and its
narrative thread said "migrating an entire ETL infrastructure". Both
pair a full-ownership framing with a company-scale object, which
claims.json SW-1 forbids outright.
bundle_ml_ai_engineer.md - the SW-1 reframing row read "Built
cloud-native data infrastructure on AWS ... the scalable data layer",
which is both a full-ownership verb on an org-scale object and an
unverified scale claim.
Both rewritten to the scoped form with inline scope warnings, matching
the data_engineer fix. bundle_analytics_engineer.md and
bundle_semiconductor.md were checked and are clean.
These were loaded traps: any future cover letter built from either
bundle would have started from a sentence claims.json forbids.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MHtzyTKBcg6BWhD5qFegtK
dennisthiessenandClaude Opus 5
f8b4cd3473