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finaltype

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Location Seoul, Republic of Korea Joined Joined on  github website

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System SW engineer

"[2609] 공유계좌 실거래 확장과 GPU 이중화, 그 사이 측정 도구 자체의 결함들"
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"[2609] 공유계좌 실거래 확장과 GPU 이중화, 그 사이 측정 도구 자체의 결함들"

#quant #trading #devlog
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1 min read

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"[Sep 2026] Expanding Live Trading to a Shared Account, Doubling Up on GPUs, and the Measurement Tools That Kept Lying"
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"[Sep 2026] Expanding Live Trading to a Shared Account, Doubling Up on GPUs, and the Measurement Tools That Kept Lying"

#quant #trading #devlog
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6 min read
"[260930] 모의계좌 장부대조 잔차 원인 규명과 방치된 경보 정리"
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"[260930] 모의계좌 장부대조 잔차 원인 규명과 방치된 경보 정리"

#quant #trading #devlog
Comments
1 min read
"[260930] Tracing a Paper-Account Reconciliation Gap, and Retiring a Dead Alert"
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"[260930] Tracing a Paper-Account Reconciliation Gap, and Retiring a Dead Alert"

#quant #trading #devlog
Comments
3 min read
"[260929] R9700 백업 GPU 전멸 사고, 두 번 틀린 원인 진단"
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"[260929] R9700 백업 GPU 전멸 사고, 두 번 틀린 원인 진단"

#quant #trading #devlog
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1 min read
"[260929] R9700 Backup GPU Total Failure - Getting the Cause Wrong Twice"
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"[260929] R9700 Backup GPU Total Failure - Getting the Cause Wrong Twice"

#quant #trading #devlog
Comments
4 min read
"[260928] R9700 백업 GPU 자가치료 배선과 동시요청 상향 재검토"
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"[260928] R9700 백업 GPU 자가치료 배선과 동시요청 상향 재검토"

#quant #trading #devlog
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1 min read
"[260928] R9700 Backup GPU - Wiring Self-Healing In and Rechecking the Concurrency Bump"
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"[260928] R9700 Backup GPU - Wiring Self-Healing In and Rechecking the Concurrency Bump"

#quant #trading #devlog
Comments
3 min read
"[260922~260927] 안전장치를 겹겹이 쌓고, 전제를 다시 검증한 한 주"
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"[260922~260927] 안전장치를 겹겹이 쌓고, 전제를 다시 검증한 한 주"

#quant #trading #devlog
Comments
1 min read
"[Sep 22-27] Stacking Safety Nets While Re-Checking Whether Fixes Actually Worked"
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"[Sep 22-27] Stacking Safety Nets While Re-Checking Whether Fixes Actually Worked"

#quant #trading #devlog
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6 min read
"[260927] R9700 백업 GPU, 병목 원인과 죽은 슬롯 감지기"
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"[260927] R9700 백업 GPU, 병목 원인과 죽은 슬롯 감지기"

#quant #trading #devlog
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1 min read
"[260927] R9700 Backup GPU - Bottleneck Root Cause and a Dead-Slot Detector"
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"[260927] R9700 Backup GPU - Bottleneck Root Cause and a Dead-Slot Detector"

#quant #trading #devlog
Comments
3 min read
"[260926] self-ρ 측정 전면 퇴역과 테스트발 원장 오염 발견"
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"[260926] self-ρ 측정 전면 퇴역과 테스트발 원장 오염 발견"

#quant #trading #devlog
Comments
1 min read
"[Sep 26] Retiring self-consistency checks and catching a test that was polluting the live ledger"
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"[Sep 26] Retiring self-consistency checks and catching a test that was polluting the live ledger"

#quant #trading #devlog
Comments
3 min read
R9700에서 35B MoE 모델을 돌려본 기록 - 백엔드, 동시성, MTP를 하나씩 재봤습니다
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R9700에서 35B MoE 모델을 돌려본 기록 - 백엔드, 동시성, MTP를 하나씩 재봤습니다

#quant #trading #devlog
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2 min read
Running a 35B MoE Model on the R9700 - I Measured the Backend, Concurrency, and MTP One at a Time
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Running a 35B MoE Model on the R9700 - I Measured the Backend, Concurrency, and MTP One at a Time

#quant #trading #devlog
Comments
6 min read
27B dense 모델을 RTX 5090 한 장에서 2배 빠르게 - 병목은 동시성 숫자가 아니라 KV 캐시였다
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27B dense 모델을 RTX 5090 한 장에서 2배 빠르게 - 병목은 동시성 숫자가 아니라 KV 캐시였다

#quant #trading #devlog
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2 min read
Making a 27B Dense Model 2x Faster on One RTX 5090 - The Bottleneck Was the KV Cache, Not the Concurrency Setting
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Making a 27B Dense Model 2x Faster on One RTX 5090 - The Bottleneck Was the KV Cache, Not the Concurrency Setting

#quant #trading #devlog
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7 min read
시가총액 데이터가 전부 결측치로 왔는데 왜 에러가 안 났을까
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시가총액 데이터가 전부 결측치로 왔는데 왜 에러가 안 났을까

#softwarequality #postmortem #debugging #quant
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1 min read
The Market-Cap Column Came Back All NaN - Why No Error Fired
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The Market-Cap Column Came Back All NaN - Why No Error Fired

#softwarequality #postmortem #debugging #quant
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4 min read
"[260925] 뉴스 수집 범위 실시간화와 보조 카드 안전장치 배포"
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"[260925] 뉴스 수집 범위 실시간화와 보조 카드 안전장치 배포"

#quant #trading #devlog
Comments
1 min read
"[Sep 25] Making News Collection Real-Time and Shipping a Standby-GPU Safeguard"
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"[Sep 25] Making News Collection Real-Time and Shipping a Standby-GPU Safeguard"

#quant #trading #devlog
Comments
3 min read
"[260924] 야간 실행 시각 조정과 보조 카드 상시운용 설계 검토"
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"[260924] 야간 실행 시각 조정과 보조 카드 상시운용 설계 검토"

#quant #trading #devlog
Comments
1 min read
"[Sep 24] Shifting a Nightly Run Time and Reviewing a Standby-GPU Design"
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"[Sep 24] Shifting a Nightly Run Time and Reviewing a Standby-GPU Design"

#quant #trading #devlog
Comments
4 min read
"[260923] 주문 식별 로직 마무리와 비대해진 작업 문서 다이어트"
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"[260923] 주문 식별 로직 마무리와 비대해진 작업 문서 다이어트"

#quant #trading #devlog
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1 min read
"[Sep 23] Closing Out an Order-Identification Gap and Putting the Task Doc on a Diet"
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"[Sep 23] Closing Out an Order-Identification Gap and Putting the Task Doc on a Diet"

#quant #trading #devlog
Comments
3 min read
"[260922] 서버가 조용히 망가지는 문제 - 감지·격리·복구 안전장치를 만든 하루"
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"[260922] 서버가 조용히 망가지는 문제 - 감지·격리·복구 안전장치를 만든 하루"

#quant #trading #devlog
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1 min read
"[Sep 22] The Server Was Quietly Degrading - Building a Detect-Isolate-Recover Safeguard"
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"[Sep 22] The Server Was Quietly Degrading - Building a Detect-Isolate-Recover Safeguard"

#quant #trading #devlog
Comments
3 min read
The Dropped Temperature Parameter - Why the A/B Test Was Invalid From the Start
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The Dropped Temperature Parameter - Why the A/B Test Was Invalid From the Start

#softwarequality #postmortem #debugging #quant
Comments
4 min read
온도를 처음으로 진짜 바꿔봤더니 - 사전등록 규칙이 "기각"이라 했는데 내가 뒤집은 이유
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온도를 처음으로 진짜 바꿔봤더니 - 사전등록 규칙이 "기각"이라 했는데 내가 뒤집은 이유

#quant #trading #devlog
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1 min read
I Finally Changed the Temperature for Real - and Overrode a Pre-Registered Rule That Said "Reject"
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I Finally Changed the Temperature for Real - and Overrode a Pre-Registered Rule That Said "Reject"

#quant #trading #devlog
Comments
5 min read
"[260914~260920] 측정·검증 도구 자체의 결함을 연달아 찾은 한 주"
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"[260914~260920] 측정·검증 도구 자체의 결함을 연달아 찾은 한 주"

#quant #trading #devlog
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1 min read
"[Sep 14-20] A Week of Catching Measurement Tools Lying to Us"
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"[Sep 14-20] A Week of Catching Measurement Tools Lying to Us"

#quant #trading #devlog
Comments
5 min read
"[260920] AI 응답 온도 실험 - 판정은 애매, 최종 결정은 내일로"
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"[260920] AI 응답 온도 실험 - 판정은 애매, 최종 결정은 내일로"

#quant #trading #devlog
Comments
1 min read
"[Sep 20] Temperature Experiment — Direction Was Clear, Size Wasn't, Decision Deferred"
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"[Sep 20] Temperature Experiment — Direction Was Clear, Size Wasn't, Decision Deferred"

#quant #trading #devlog
Comments
3 min read
LLM 온도 파라미터 유실 사고 - A/B 테스트가 처음부터 무효였던 이유
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LLM 온도 파라미터 유실 사고 - A/B 테스트가 처음부터 무효였던 이유

#softwarequality #postmortem #debugging #quant
Comments
1 min read
"[260919] 성능측정 하네스 - 자동 재개가 권한 벽에 막혀 GPU를 헛되이 점유했다"
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"[260919] 성능측정 하네스 - 자동 재개가 권한 벽에 막혀 GPU를 헛되이 점유했다"

#quant #trading #devlog
Comments
1 min read
"[Sep 19] Benchmark Harness — Auto-Resume Hit a Permission Wall and Wasted GPU Time"
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"[Sep 19] Benchmark Harness — Auto-Resume Hit a Permission Wall and Wasted GPU Time"

#quant #trading #devlog
Comments
2 min read
"[260918] 성능측정 하네스 - 측정 도구 자체의 계측 오류 두 건을 발견해 고쳤다"
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"[260918] 성능측정 하네스 - 측정 도구 자체의 계측 오류 두 건을 발견해 고쳤다"

#quant #trading #devlog
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1 min read
"[Sep 18] Benchmark Harness — Two Measurement Bugs in the Measuring Tool Itself"
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"[Sep 18] Benchmark Harness — Two Measurement Bugs in the Measuring Tool Itself"

#quant #trading #devlog
Comments
3 min read
"[260917] 벤치마크 하네스 첫 검증 - 설정이 새는 지점을 하나씩 막았다"
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"[260917] 벤치마크 하네스 첫 검증 - 설정이 새는 지점을 하나씩 막았다"

#quant #trading #devlog
Comments
1 min read
"[Sep 17] First Run of a Benchmark Harness — Plugging the Leaks One by One"
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"[Sep 17] First Run of a Benchmark Harness — Plugging the Leaks One by One"

#quant #trading #devlog
Comments
4 min read
"[260916] AI 판단 모델 샘플링 설정 점검 - 의도와 다른 값으로 돌고 있었다"
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"[260916] AI 판단 모델 샘플링 설정 점검 - 의도와 다른 값으로 돌고 있었다"

#quant #trading #devlog
Comments
1 min read
"[Sep 16] Checking the AI Judgment Models' Sampling Settings — Wrong Values All Along"
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"[Sep 16] Checking the AI Judgment Models' Sampling Settings — Wrong Values All Along"

#quant #trading #devlog
Comments
3 min read
"[260915] 동점 점수 처리 로직 교체 - 기각된 방식에서 새 방식으로"
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"[260915] 동점 점수 처리 로직 교체 - 기각된 방식에서 새 방식으로"

#quant #trading #devlog
Comments
1 min read
"[Sep 15] Replacing the Tie-Break Logic — from a Rejected Method to a New One"
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"[Sep 15] Replacing the Tie-Break Logic — from a Rejected Method to a New One"

#quant #trading #devlog
Comments
3 min read
증권사를 하나 더 붙였더니, 사고가 전부 새 쪽에서만 났습니다
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증권사를 하나 더 붙였더니, 사고가 전부 새 쪽에서만 났습니다

#softwarequality #postmortem #debugging #quant
Comments
1 min read
I Added a Second Broker API, and Every Incident Since Has Come From It
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I Added a Second Broker API, and Every Incident Since Has Come From It

#softwarequality #postmortem #debugging #quant
Comments
7 min read
"[260914] 외부 시세 데이터가 통째로 비어버린 날 - 유니버스 오염 사고"
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"[260914] 외부 시세 데이터가 통째로 비어버린 날 - 유니버스 오염 사고"

#quant #trading #devlog
Comments
1 min read
"[260914] The Day Market-Cap Data Came Back Empty - A Universe Contamination Incident"
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"[260914] The Day Market-Cap Data Came Back Empty - A Universe Contamination Incident"

#quant #trading #devlog
Comments
3 min read
"[260907~0913] 공유계좌 실거래 전환 - 계좌 구분값 누락이 반복해서 문제를 일으켰다"
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"[260907~0913] 공유계좌 실거래 전환 - 계좌 구분값 누락이 반복해서 문제를 일으켰다"

#quant #trading #devlog
Comments
1 min read
"[Sep 07-13] Moving to a Shared Live Account - The Same Missing-Account-ID Bug Kept Recurring"
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"[Sep 07-13] Moving to a Shared Live Account - The Same Missing-Account-ID Bug Kept Recurring"

#quant #trading #devlog
Comments
5 min read
"[260913] 킬스위치 사고 사후검토 - 증상만 지웠던 원인이 남아있었다"
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"[260913] 킬스위치 사고 사후검토 - 증상만 지웠던 원인이 남아있었다"

#quant #trading #devlog
Comments
1 min read
"[Sep 13] Kill-Switch Postmortem - the Root Cause Was Still There"
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"[Sep 13] Kill-Switch Postmortem - the Root Cause Was Still There"

#quant #trading #devlog
Comments
4 min read
"[260912] 킬스위치 오발 - 계좌 구분값 누락이 부른 실거래 정지 위험"
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"[260912] 킬스위치 오발 - 계좌 구분값 누락이 부른 실거래 정지 위험"

#quant #trading #devlog
Comments
1 min read
"[Sep 12] A False Kill-Switch Trip From a Missing Account Tag"
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"[Sep 12] A False Kill-Switch Trip From a Missing Account Tag"

#quant #trading #devlog
Comments
2 min read
[260907~260909] 실계좌 자동매매 주간 현황
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[260907~260909] 실계좌 자동매매 주간 현황

#quant #trading #livetrading
Comments
1 min read
[260907~260909] Live Account Auto-Trading Weekly Report
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[260907~260909] Live Account Auto-Trading Weekly Report

#quant #trading #livetrading
Comments
1 min read
테스트 정리 코드가 운영 서버를 죽인 사고
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테스트 정리 코드가 운영 서버를 죽인 사고

#softwarequality #postmortem #debugging #quant
Comments
1 min read
When a Test Cleanup Step Killed a Production Process
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When a Test Cleanup Step Killed a Production Process

#softwarequality #postmortem #debugging #quant
Comments
4 min read
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