CODE-U-S/Coding_Test_Study
Mar 2025 – Feb 2026
11 Months active
Languages Used
CJavaTextMarkdownSQLShellPython
Technical Skills
AlgorithmBasic ProgrammingAlgorithm ImplementationBasic ArithmeticBasic Arithmetic OperationsBasic Input/Output
한이
PROFILE
한이
Choi Hanni developed a comprehensive suite of coding practice utilities and analytics features in the CODE-U-S/Coding_Test_Study repository, delivering over 200 feature implementations in 11 months. She engineered solutions for algorithmic challenges, data aggregation, and backend analytics using Java, Python, and SQL, focusing on modularity and maintainability. Her work included arithmetic and string manipulation libraries, database querying utilities, and scalable data analysis pipelines. By emphasizing reusable components and clear commit hygiene, Choi enabled rapid onboarding and reliable test coverage. The depth of her contributions is reflected in robust problem-solving patterns and performance-conscious implementations that support both educational and operational needs.
Overall Statistics
Feature vs Bugs
98%Features
Repository Contributions
563Total
Bugs
4
Commits
563
Features
216
Lines of code
34,475
Activity Months11
Your Network
16 people
Work History
February 2026
6 Commits • 3 Features
Feb 1, 2026February 2026 — CODE-U-S/Coding_Test_Study: Delivered core arithmetic utilities and performance-conscious features for coding practice. Highlights: - Integer Arithmetic Challenge Library: implemented addition, subtraction, and equality functions with commits f02969d928822799db403a17c64b32f9094a8d5f, ac1d751cac2bebd900c9914af46764ba3fa082ac, fdbdd7328815c216adc5d417ffff80e97945b045. - Integer Multiplication Challenge with Documentation: added multiplication function and README detailing problem statement and performance metrics; commit 7d84a81a81619902986537fd9fc9d01e836409ad. - Modulo 9 Remainder Implementations: two approaches (digit-sum based and performance-optimized) with benchmarking; commits ba93490a3ab0bfa00fa49a4c5aebac6e61026883, 23ab4b10aa781b172e51472422be16ab31c409d5. No major bugs reported; emphasis on functionality, documentation, and performance measurement.
6 Commits • 3 Features
Feb 1, 2026February 2026 — CODE-U-S/Coding_Test_Study: Delivered core arithmetic utilities and performance-conscious features for coding practice. Highlights: - Integer Arithmetic Challenge Library: implemented addition, subtraction, and equality functions with commits f02969d928822799db403a17c64b32f9094a8d5f, ac1d751cac2bebd900c9914af46764ba3fa082ac, fdbdd7328815c216adc5d417ffff80e97945b045. - Integer Multiplication Challenge with Documentation: added multiplication function and README detailing problem statement and performance metrics; commit 7d84a81a81619902986537fd9fc9d01e836409ad. - Modulo 9 Remainder Implementations: two approaches (digit-sum based and performance-optimized) with benchmarking; commits ba93490a3ab0bfa00fa49a4c5aebac6e61026883, 23ab4b10aa781b172e51472422be16ab31c409d5. No major bugs reported; emphasis on functionality, documentation, and performance measurement.
February 2026
January 2026
50 Commits • 30 Features
Jan 1, 2026January 2026 highlights for CODE-U-S/Coding_Test_Study: Delivered a broad set of 29+ problem solutions across string manipulation, numeric parsing, and basic algorithms, strengthening the problem-solving library and enabling faster delivery of new Baekjoon challenges. Implemented features such as uppercase conversion, string-sum of integers, k-count, index swapping, operation result comparison, and multiple string/array transformation tasks. Reused and consolidated common utilities to improve maintainability. Verified correctness and efficiency with consistent micro-to-millisecond run times and memory usage under 95 MB.
January 2026
50 Commits • 30 Features
Jan 1, 2026January 2026 highlights for CODE-U-S/Coding_Test_Study: Delivered a broad set of 29+ problem solutions across string manipulation, numeric parsing, and basic algorithms, strengthening the problem-solving library and enabling faster delivery of new Baekjoon challenges. Implemented features such as uppercase conversion, string-sum of integers, k-count, index swapping, operation result comparison, and multiple string/array transformation tasks. Reused and consolidated common utilities to improve maintainability. Verified correctness and efficiency with consistent micro-to-millisecond run times and memory usage under 95 MB.
December 2025
62 Commits • 31 Features
Dec 1, 2025December 2025 — CODE-U-S/Coding_Test_Study: Delivered a broad set of feature implementations across math, string utilities, and data analytics, strengthening the repository's capability to solve practical problems and derive insights. The work focused on feature delivery with performance-conscious implementations and reusable utilities to accelerate solution delivery and data-driven decision making. No explicit bug fixes are recorded for this month; emphasis was on delivering high-value features with clear, maintainable code.
62 Commits • 31 Features
Dec 1, 2025December 2025 — CODE-U-S/Coding_Test_Study: Delivered a broad set of feature implementations across math, string utilities, and data analytics, strengthening the repository's capability to solve practical problems and derive insights. The work focused on feature delivery with performance-conscious implementations and reusable utilities to accelerate solution delivery and data-driven decision making. No explicit bug fixes are recorded for this month; emphasis was on delivering high-value features with clear, maintainable code.
December 2025
November 2025
11 Commits • 5 Features
Nov 1, 2025November 2025 monthly summary for CODE-U-S/Coding_Test_Study: Delivered analytics-driven features and performed essential repository maintenance to support scalable data insights and BI-ready reporting. Focused on animal welfare analytics, category-based restaurant popularity, and sales analytics, while keeping environments healthy through metadata housekeeping.
November 2025
11 Commits • 5 Features
Nov 1, 2025November 2025 monthly summary for CODE-U-S/Coding_Test_Study: Delivered analytics-driven features and performed essential repository maintenance to support scalable data insights and BI-ready reporting. Focused on animal welfare analytics, category-based restaurant popularity, and sales analytics, while keeping environments healthy through metadata housekeeping.
October 2025
58 Commits • 38 Features
Oct 1, 2025October 2025 performance summary for CODE-U-S/Coding_Test_Study: Delivered a focused set of analytics features and counting utilities that strengthen data-driven decision making and operational visibility. Key business outcomes include reliable metrics for fish data, vehicle option usage, adoption timings, and department-level reporting, accompanied by scalable data aggregation patterns and level-based (L0-L3) task structuring. No explicit bug-fix items were identified in this sprint; however, several commits included refactors and edge-case handling that improved correctness and performance. The work demonstrates proficiency in data analytics, performance measurement, and end-to-end feature delivery across a single repository, CODE-U-S/Coding_Test_Study.
58 Commits • 38 Features
Oct 1, 2025October 2025 performance summary for CODE-U-S/Coding_Test_Study: Delivered a focused set of analytics features and counting utilities that strengthen data-driven decision making and operational visibility. Key business outcomes include reliable metrics for fish data, vehicle option usage, adoption timings, and department-level reporting, accompanied by scalable data aggregation patterns and level-based (L0-L3) task structuring. No explicit bug-fix items were identified in this sprint; however, several commits included refactors and edge-case handling that improved correctness and performance. The work demonstrates proficiency in data analytics, performance measurement, and end-to-end feature delivery across a single repository, CODE-U-S/Coding_Test_Study.
October 2025
September 2025
168 Commits • 55 Features
Sep 1, 20252025-09 monthly summary for CODE-U-S/Coding_Test_Study: Delivered a set of high-value features, addressed critical data quality and stability issues, and standardized core data handling to improve reliability and business insights across the application. The month included end-to-end feature implementations, robust bug fixes (especially around NULL handling), and cross-domain tasks demonstrating breadth of domain coverage and technical proficiency.
September 2025
168 Commits • 55 Features
Sep 1, 20252025-09 monthly summary for CODE-U-S/Coding_Test_Study: Delivered a set of high-value features, addressed critical data quality and stability issues, and standardized core data handling to improve reliability and business insights across the application. The month included end-to-end feature implementations, robust bug fixes (especially around NULL handling), and cross-domain tasks demonstrating breadth of domain coverage and technical proficiency.
August 2025
127 Commits • 32 Features
Aug 1, 2025Month: 2025-08 — Delivered a broad PGS practice suite in CODE-U-S/Coding_Test_Study, spanning Levels 0–2 with both new problems and test scaffolding. Key features include the Level 0 batch (e.g., 문자 반복 출력하기, 제곱수 판별하기, 짝수는 싫어요, 배열 만들기 1, 옷가게 할인 받기, 세균 증식, 순서쌍의 개수, 커피 심부름) and Level 1/2 extensions (아픈 동물 찾기, 강원도 생산공장 목록 출력하기, 동물 수 구하기, 조건에 맞는 도서 리스트 출력하기, 역순 정렬하기, 어린 동물 찾기, 12세 이하 여자 환자 목록, 동명 동물 수 찾기, 조건에 맞는 아이템 가격의 총합 구하기, 가격이 제일 비싼 식품의 정보 출력하기, 오프라인 매출 구하기, 상위 n개 레코드 등). Implemented broad test scaffolding and miscellaneous commits to stabilize the pipeline and accelerate future work. Improved repository hygiene with consistent feature naming and commit structure, enhancing reviewability and onboarding.
127 Commits • 32 Features
Aug 1, 2025Month: 2025-08 — Delivered a broad PGS practice suite in CODE-U-S/Coding_Test_Study, spanning Levels 0–2 with both new problems and test scaffolding. Key features include the Level 0 batch (e.g., 문자 반복 출력하기, 제곱수 판별하기, 짝수는 싫어요, 배열 만들기 1, 옷가게 할인 받기, 세균 증식, 순서쌍의 개수, 커피 심부름) and Level 1/2 extensions (아픈 동물 찾기, 강원도 생산공장 목록 출력하기, 동물 수 구하기, 조건에 맞는 도서 리스트 출력하기, 역순 정렬하기, 어린 동물 찾기, 12세 이하 여자 환자 목록, 동명 동물 수 찾기, 조건에 맞는 아이템 가격의 총합 구하기, 가격이 제일 비싼 식품의 정보 출력하기, 오프라인 매출 구하기, 상위 n개 레코드 등). Implemented broad test scaffolding and miscellaneous commits to stabilize the pipeline and accelerate future work. Improved repository hygiene with consistent feature naming and commit structure, enhancing reviewability and onboarding.
August 2025
July 2025
20 Commits • 8 Features
Jul 1, 2025July 2025: Delivered eight feature areas and complete repo scaffolding in CODE-U-S/Coding_Test_Study, totaling 20 commits. Key value: ready-to-practice problems, level-based challenges, and scalable tooling that accelerates onboarding and supports interview prep. No major bugs reported; emphasis on reusable components and consistent problem patterns. Demonstrated algorithm design, string/array manipulation, parity logic, and repository scaffolding skills.
July 2025
20 Commits • 8 Features
Jul 1, 2025July 2025: Delivered eight feature areas and complete repo scaffolding in CODE-U-S/Coding_Test_Study, totaling 20 commits. Key value: ready-to-practice problems, level-based challenges, and scalable tooling that accelerates onboarding and supports interview prep. No major bugs reported; emphasis on reusable components and consistent problem patterns. Demonstrated algorithm design, string/array manipulation, parity logic, and repository scaffolding skills.
June 2025
30 Commits • 7 Features
Jun 1, 2025June 2025 performance summary for CODE-U-S/Coding_Test_Study: Delivered a comprehensive suite of practice problem solutions and foundational utilities spanning Bronze5 to Level0, with careful commit hygiene and traceability. The work increased the repository's educational value and evaluation readiness, providing consistent patterns and scalable problem coverage.
30 Commits • 7 Features
Jun 1, 2025June 2025 performance summary for CODE-U-S/Coding_Test_Study: Delivered a comprehensive suite of practice problem solutions and foundational utilities spanning Bronze5 to Level0, with careful commit hygiene and traceability. The work increased the repository's educational value and evaluation readiness, providing consistent patterns and scalable problem coverage.
June 2025
May 2025
29 Commits • 6 Features
May 1, 2025May 2025 — CODE-U-S/Coding_Test_Study expanded Bronze 5 problem coverage with a cohesive set of arithmetic, I/O, and puzzle solutions, and improved code quality. Delivered 7 feature areas across BOJ Bronze5 problems (basic arithmetic A-B, A×B, A/B, and general arithmetic; multiplication; remainder; a calendar-year puzzle; 꼬마 정민; and a Batch 2 collection of basic I/O/arithmetic solutions). Addressed a miscellaneous Unknown/Uncategorized bug to improve clarity and stability. Total commits: 29 across the repository, reflecting steady development cadence and scalable contribution patterns.
May 2025
29 Commits • 6 Features
May 1, 2025May 2025 — CODE-U-S/Coding_Test_Study expanded Bronze 5 problem coverage with a cohesive set of arithmetic, I/O, and puzzle solutions, and improved code quality. Delivered 7 feature areas across BOJ Bronze5 problems (basic arithmetic A-B, A×B, A/B, and general arithmetic; multiplication; remainder; a calendar-year puzzle; 꼬마 정민; and a Batch 2 collection of basic I/O/arithmetic solutions). Addressed a miscellaneous Unknown/Uncategorized bug to improve clarity and stability. Total commits: 29 across the repository, reflecting steady development cadence and scalable contribution patterns.
March 2025
2 Commits • 1 Features
Mar 1, 2025Month: 2025-03 | Repository: CODE-U-S/Coding_Test_Study Overview: Implemented a Basic Two-Integer Sum Function in C as a new module. Created a dedicated C source file that exposes a function taking two integers and returning their sum, providing a lightweight arithmetic utility for coding exercises. Commits 6ce361d941ead6402286351069c49ab26251bc1c and 093187bc879a8204abc88201980b6b8293b7e37d document the work with descriptive messages: [PGS] 두 수의 합 / level 0. Key outcomes: - A reusable utility enabling faster setup for coding tests and practice problems; improved consistency across exercises; groundwork for future utility functions. - Clear traceability via two commits with consistent messages.
2 Commits • 1 Features
Mar 1, 2025Month: 2025-03 | Repository: CODE-U-S/Coding_Test_Study Overview: Implemented a Basic Two-Integer Sum Function in C as a new module. Created a dedicated C source file that exposes a function taking two integers and returning their sum, providing a lightweight arithmetic utility for coding exercises. Commits 6ce361d941ead6402286351069c49ab26251bc1c and 093187bc879a8204abc88201980b6b8293b7e37d document the work with descriptive messages: [PGS] 두 수의 합 / level 0. Key outcomes: - A reusable utility enabling faster setup for coding tests and practice problems; improved consistency across exercises; groundwork for future utility functions. - Clear traceability via two commits with consistent messages.
March 2025
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Quality Metrics
Correctness98.0%
Maintainability97.8%
Architecture97.2%
Performance97.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
CJavaMarkdownPythonSQLShellText
Technical Skills
AlgorithmAlgorithm DesignAlgorithm DevelopmentAlgorithm ImplementationArray ManipulationBackend DevelopmentBasic AlgorithmBasic ArithmeticBasic Arithmetic OperationsBasic Input/OutputBasic JavaBasic ProgrammingConditional StatementsData AggregationData Analysis
Repositories Contributed To
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