2026-W31 Worklog

# 2026-W31 Worklog

AI Summary

Purpose:

• Record cross-repository work and career-state changes for ISO week 31 of 2026.

Key points:

• 2026-07-28: The user reported that the Daangn Software Engineer, Data

application was rejected. The application was submitted on 2026-07-24.

• The exact rejected stage and company-provided reason are Needs confirmation;

neither was inferred.

• The Korean application tracker and the final-resume archive index were updated

to reflect the result.

• 2026-07-29: Patched labradorlabs/master-bts:4.0.0 Docker image in place —

replaced curl/libcurl 7.76.1 el9 RPMs with upstream curl 8.21.0 as a new layer, without rebuilding the app (embedded-key layers preserved bit-identical). Deliverable: ~/Downloads/labradorlabs_master-bts_4.0.0-curl8.21.tar.gz.

• 2026-07-29: Built an evidence-audited CJ Olive Young Data Engineer resume

and portfolio package. Independent CEO/CTO/Tech Lead reviews passed at 97/98/96, but the deterministic document-quality score was 91.2 because verified direct must-have coverage is 6/10. No final-submission archive was created under the binding 95-point gate.

• 2026-07-30: Reflowed the CJ Olive Young resume from three A4 pages to two

without removing content. Final visual QA passed at 96/97 for layout and CJK typography, with no clipping or orphan blockers.

Relevant when:

• Checking current 2026 application outcomes.
• Preparing a later application retrospective.

Do not read full document unless:

• The exact status wording or affected tracking files are needed.

Linked documents:

• human/career/2026-지원-현황.md
• human/career/index.html
• ai/worklog/2026/2026-W30.md

Open Questions

• Needs confirmation: which selection stage produced the rejection.
• Needs confirmation: whether the rejection notice included a reason worth

preserving for later targeting analysis.

Details

2026-07-28 — Daangn Software Engineer, Data result

• Application date: 2026-07-24.
• Result reported directly by the user: rejected on 2026-07-28.
• Recorded status: Rejected — stage Needs confirmation.
• No retrospective cause was added. The known posting gaps

(streaming/Kafka/GCP/experimentation platform) remain application-time fit notes, not verified rejection reasons.

2026-07-29 — BTSv4 image: curl/libcurl CVE remediation without app rebuild

Context: a customer vulnerability scan flagged curl/libcurl < 8.21.0 (CVE-2026-8286 and ~20 others) in labradorlabs/master-bts:4.0.0. The BTS application code does not use curl/libcurl at all; the packages came from UnifiedDockerfile's microdnf install curl (debug convenience) on the mysql:8.4.0 (Oracle Linux 9.4) base. A full image rebuild was ruled out because the app has embedded keys and a wrong redeploy risks customer impact.

What was done:

• Verified in-image consumers of libcurl.so.4: librepo (microdnf) and

mysql-shell. mysqld, rpm, and all /app binaries (Go/PyInstaller) do not link it. el9 libcurl has NO versioned symbols, so an upstream default build is ABI-compatible (SONAME libcurl.so.4).

• Built upstream curl 8.21.0 (source from curl.se, sha256

aa1b66a70eace83dc624508745646c08ae561de512ab403adffb93ac87fc72e6) in an oraclelinux:9 builder with OpenSSL/zlib/nghttp2/libpsl/libidn2/brotli.

• New image labradorlabs/master-bts:4.0.0-curl8.21 = FROM the original

image + rpm -e --nodeps curl libcurl + COPY of new /usr/bin/curl and /usr/lib64/libcurl.so.4 + ldconfig. All 19 original layers preserved bit-identical (verified via RootFS diff_ids); 4 layers added.

• Tests (all passed): rpm DB has no curl/libcurl entries (scanner-clean);

curl 8.21.0 / libcurl 8.21.0 with working HTTPS + CA bundle; microdnf makecache works through the new libcurl (librepo ABI proven); mysqld --version and live SELECT VERSION() OK; startup logs of original vs patched containers identical (47 lines, timestamp-normalized diff empty); process lists identical.

• Deliverable: ~/Downloads/labradorlabs_master-bts_4.0.0-curl8.21.tar.gz

(207MB, sha256 0cc9edc5c3d4a80f314e1731ddc630dfa2292f1707a9fd62b0709e7e6570883f), built with --provenance=false (single manifest, old-docker compatible). Reproducible patch Dockerfile kept at ~/Downloads/bts-curl-patch/.

Caveats recorded:

• If someone later runs microdnf install in this image, dnf may pull the

el9 libcurl RPM back in (dangling mysql-shell dependency) and overwrite the 8.21.0 file. Runtime never does this; only manual debugging would.

• Long-term fix for the next regular release: drop curl from

UnifiedDockerfile (nothing in the repo invokes it) or bake this 8.21.0 build into the release pipeline.

2026-07-29 — CJ Olive Young Data Engineer tailored application package

Context:

• The user supplied Wanted posting 351571 and requested a company-specific

resume and portfolio.

• The posting was preserved at

ai/sources/career/2026-07-29-cj-oliveyoung-data-engineer-wanted-351571.md.

Package:

• Working folder:

career/맞춤이력서/cj-oliveyoung-data-engineer/.

• Produced resume.pdf (A4, 2 pages) and portfolio.pdf (A4, 5 pages), plus

the captured posting, requirement map, portfolio plan, evidence audit, review manifest, and deterministic quality report.

• The resume uses the canonical ATS template and default profile photo. Key

metrics and decisions use the canonical yellow <b> highlighter.

Evidence and fit:

• Audited 43/43 claims and 22/22 numeric claims to source; unsupported,

contradictory, role-boundary, and prohibited production-skill findings are all zero.

• Direct must-have support is 6/10 and preferred support is 4/6. Confirmed

gaps remain Kafka real-time streaming, real-time cross-system sync, Spark, REST API Bulk semantics/throughput, OGG/Debezium production use, Google Cloud, and named Data Mart construction.

• Corrected the CDC wording to the verified implementation boundary:

Python/FastAPI provides raw binlog files after XOR scrambling part of the header; the customer-side Go Updater decompresses MySQL 8.4 ZSTD Transaction_payload data and parses/applies ROW events. The public CDC detail source was corrected locally, but its stale live page was not linked from the submission PDFs.

Verification:

• Independent final reviews: CEO 97, CTO 98, Tech Lead 96; no reviewer

blockers.

• Final resume whitespace-v4 visual gates: 96 for layout/design-system

compliance and 97 for CJK typography; no spacing, clipping, tofu, or orphan blockers. The portfolio remains on its prior render-7 verification.

• Deterministic quality score: 91.2/100. The only hard gate is the score below

95; evidence, ATS, artifact, and reviewer gates pass.

• Human-voice strict check: BAN 0 / STRUCT 0 / WARN 0.
• Visually inspected all 7 rendered pages; no clipping, overlap, missing

glyphs, or broken page numbers. Linked public detail pages and GitHub returned HTTP 200.

• Because the 95-point release gate was not met honestly, the PDFs remain in

the working folder and were not copied to career/최종 이력서/.

2026-07-30 — CJ Olive Young Data Engineer package: Claude review round, gate passed (95.1)

Cross-agent follow-up on the Codex package in career/맞춤이력서/cj-oliveyoung-data-engineer/ (user request: additional review + 3-persona passes over resume and portfolio).

• R4 (RestAPI Bulk collection/transfer) re-judged from "partial, Bulk

semantics unverified" to direct-with-scope-limits after locating direct evidence: the registry full-enumeration comparison finder tools are the user's own work (ai/wiki/projects/library-missing-improvements.md), and the NPM daily audit figures (3,825,366 packages / 890 missing / ~104 min) are recorded in ai/worklog/2026/2026-W23.md. Must-have support 6/10 → 7/10. Residual limit kept honest: no verified transfer contract or throughput SLA.

• Narrative fixes: removed the two duplicate claim/metric pairs (CDC bullet vs

case 1, integrity bullet vs case 2), made the CI/CD kit and instance-split cards problem-action-result with verified facts (spec.md change-contract incident, FILE COMPONENT binlog delay motive), corrected the AWS→in-house server→IDC causal chain (W29), noted the one production DB EC2 instance that stayed on AWS (2026-07-22 source), restored the W29 RubyGems precision wording (idempotent full-version-list backfill, 1,310 versions applied), and disambiguated the Go escape fix as a crawler-code fix.

• Disclosure hygiene (persona findings): removed all 근거: ai/... internal

paths from the submission portfolio (they exposed the internal codename bts); replaced XOR scrambling with header 일부 난독화 in both submission artifacts (exact mechanism stays in the internal audit; matches the W23 decision to exclude XOR weakness detail); removed the English review-jargon "Gap" from the resume boundary row; replaced the one DIST DB mention with 배포 DB; kept lab-master per an explicitly recorded public-safe decision (already public on the portfolio site). OPTIMIZE non-propagation was rephrased from an engine assertion to the actual operating rule.

• Evidence-audit repairs: fixed wrong citation paths (E12 80+ crawlers →

data-platform-systems-engineering.md; E05 replica motive → public CDC page), added rows E44–E52, and recorded accepted-as-is decisions for the three human/-anchored claims (E05 replica motive, E13 Airflow pool naming, E51 index-deletion team review) — TODO: consolidate these into ai/wiki/projects/bts.md and ai/wiki/people/career-timeline.md before the next application cycle.

• Wiki hygiene: ai/wiki/projects/data-platform-systems-engineering.md

IDC-incident line corrected from "zero" to the W29-corrected "1–2".

• Ran three independent persona reviews per round, re-running all three after

each revision (4 rounds total by Claude). Final round: CEO 96 / CTO 96 / Tech lead 96, zero blocking issues.

• Deterministic gate: 95.1/100, all hard gates pass (quality-gate.md).

Verification: human-voice strict BAN 0/STRUCT 0/WARN 0; both PDFs re-rendered (A4, 2+5 pages), all 7 pages visually inspected; XOR/Gap/DIST/internal-path strings confirmed absent from extracted PDF text; portfolio item links canonicalized to redirect-free URLs (HTTP 200).

• PDFs remain in the working folder; not copied to career/최종 이력서/

because the user has not yet decided to submit.

2026-08-03 — CJ Olive Young package: user-directed de-AI pass + portfolio expansion to 8 pages

• User feedback: the "씨제이올리브영 직무와의 연결" resume section reads

AI-generated, and the 4-case submission portfolio is too thin.

• Removed the job-connection section from the resume (gap disclosure stays in

requirement-map/evidence-audit). Varied one of four repeated "파일 기반 배치형 CDC" phrasings.

• Expanded the submission portfolio 5→8 pages with three posting-relevant

cases picked from the public portfolio: CASE 05 sync observability (binlog-shipping-monitoring-v2: 5 servers, Vector→TimescaleDB→Grafana, 4 dashboard areas, N+1 completion rule), CASE 06 RAW-preserve/re-parse ETL redesign (etl-flow-redesign: 10M-100M external requests per recollection → 0 on migrated sources; in progress since 2026-03; 2d→5min kept as design estimate; SeaweedFS not counted as S3), CASE 07 library component table redesign (library-table-redesign: collation-mismatch view join 1.3M-row scans vs 6k direct join per EXPLAIN, identifier policy; 팀장·CTO review boundary). Cover reworked: connection-formula lead replaced with a factual index sentence; six unnumbered theme cards (numbers removed after review flagged a 6-cards-vs-7-cases mismatch); CASE 06 scoped against CASE 02 (vulnerability sources were already raw-first; library/package collection was the one-take pipeline).

• Evidence audit extended to E58 (57 active claims; E43 removed with the

section); three new public pages live-checked 200 and added to the verification table; E53/E56 anchored to W23; accepted-as-is note extended to E54/E56/E58.

• Persona round on the expanded package: CEO 96 / CTO 95 / Tech lead 96, no

blocking issues. Deterministic gate: 95.1/100, all hard gates pass. 10 rendered pages visually inspected; human-voice strict 0/0/0.

2026-08-03 (2nd) — resume to 3 pages, portfolio to 11 cases/12 pages (user request)

• Resume: +2 bullets (MySQL 8.0.29→8.4.0 LTS rollout; K8s hybrid 2→6 nodes, pod failures 70-100→1-5/wk), case 3 = DML Broker (3-4/day→0 over 4 months), backup-automation ops card (767GB/200GB). Job-connection section removed earlier per user (AI-tell).
• Portfolio CASE 08-11 added from public items (dml-broker, mysql-8-4-lts, k8s-hybrid, aws-to-idc, all live 200); cover reworked to unnumbered theme cards.
• Audit E59-E63; 62 claims / 34 metrics all sourced. 15 pages visually inspected; voice checks 0/0/0.
• Persona verify: CEO 96 / CTO 95 / TL 95, no blockers; two file fixes applied (replica "각 2대", E52 note). Gate: 95.1 PASS.

• 2026-08-03: CJ Olive Young final package archived to career/최종 이력서/2026-08-03/씨제이올리브영/ (resume 3p + portfolio 12p, convention-named PDFs); archive README index updated. Status: planned submission.
• 2026-08-03: CJ Olive Young application SUBMITTED (wanted.co.kr/wd/351571); archive README status updated to 제출·대기.
• 2026-08-03: NHN Payco application REJECTED (user-reported today; stage and notification date: Needs confirmation). Archive README updated.
• 2026-08-03: Vroong (부릉) — no response; user observed the posting (originally closing 07-31) reposted with an 08-31 deadline. Status recorded as presumed-silent-rejection, not confirmed (Needs confirmation). README updated.