Hocky Yudhiono

Compiler Engineer

Fullstack Developer • Competitive Programmer

New Territories, Hong Kong SAR China

+852 9489-6787

hocky

its@hocky.id

Employment History

Huawei Tech. Investment Co., Limited, Hong Kong SAR, China

Compiler Engineer, December 2023 – Now

Developed AscendNPU IR, an MLIR-based graph compiler infrastructure for Ascend AI processors, leading development of operation fusion algorithms, dimension flattening optimizations, and tensor reshape normalization passes across kernels.
Developed dimension analyzer and transformation passes that optimize multi-dimensional tensor operations, enabling efficient kernel fusion and reducing memory overhead in computation graphs.
Contributed to CCEC compiler toolchain (LLVM/Clang-based) by implementing optimization passes that improved compilation performance and code generation quality for TBE operators targeting Ascend AI Core.
Participated in internal LLVM BOLT project development, implementing post-link binary optimization techniques to improve code layout and reduce instruction cache misses for compiled operators.
Collaborated with compiler team on CCEC toolchain integration, ensuring seamless interoperability between AscendNPU IR graph optimizations and CCEC binary compilation pipeline.

References:AscendNPU IR Documentation CCEC Compiler Specification CANN Development Guide

tiket.com, Jakarta, Indonesia

Backend Engineer, April 2023 – October 2023

Being part of Flight and Pricing engineering team. Developing pricing, flights, and product business applications with Java, Jenkins, PostgreSQL, Apache Kafka, Redis, MongoDB, Grafana, Kibana, and Node.js.
Took part in grooming technical solution documents, including effort estimations and priorities organization.
In charge of maintaining 3 main projects.
Improved and scaled scraping technology horizontally and vertically.

OY Indonesia!, Jakarta, Indonesia

Fullstack Engineer Intern, January 2023 – April 2023

Developed business banking applications involving Java, React.js, PostgreSQL, and Ansible.
Fixed bugs, performance issues on the database and the three-tiered architecture systems.
Wrote unit test, system designs and API specifications for the edge features.

Money Forward, Inc., Tokyo, Japan

Backend Engineer Intern, July – August, November – December 2021, August – September 2022

Developed REST and gRPC Microservices in Golang, involving MySQL, Amazon S3 cloud object storage, and Docker.
Improved DAO layer performance of existing design.

IA-TOKI, Indonesia

Scientific Committee, September 2019 – September 2023

Prepared the delegation of Indonesia in International Olympiad in Informatics (IOI) 2020 in Singapore through its national training camp.
Provided monthly regular open contests through TLX, an online competitive programming judge platform.
Prepared problems in Asia-Pacific International Olympiad 2021.
Prepared problems in National Olympiads in Informatics (OSN) 2023 of Indonesia.

Languages

Bahasa Indonesia (Native proficiency)
English (Full professional proficiency (IELTS 7.5, C1-C2))

Achievements

46th ICPC World Finalist, Luxor, Egypt, April 2024, ICPC Foundation
Silver Medalist of APIO (Asia-Pacific Informatics Olympiad), May 2019, Innopolis University
Gold Medalist of NOI (National Olympiad of Informatics) of Singapore, March 2019, The Ministry of Education of Singapore
Champion of The 2022 ICPC Asia Jakarta Regional Contest, November 2022, ICPC Foundation
Champion of The 2022 Indonesia National Contest (INC), October 2022, ICPC Foundation
Best National and Fourth Winner of The 2021 ICPC Asia Jakarta Regional Contest, November 2021, ICPC Foundation
Champion of The 2021 Indonesia National Contest (INC), October 2021, ICPC Foundation
Silver Medalist of GEMASTIK Programming Competition, October 2021, Ministry of Education and Culture of Indonesia
Bronze Medalist of 2020 ICPC Asia Jakarta Regional Contest, December 2020, ICPC Foundation
Third Winner of the 2019 ICPC Asia Kuala Lumpur Regional Contest, November 2019, ICPC Foundation
National Gold Medalist of the 2019 ICPC Asia Jakarta Regional Contest, October 2020, ICPC Foundation
Bronze Medalist of NOI (National Olympiad of Informatics) of Indonesia, July 2017, The Ministry of Education, Culture, Research, and Technology Indonesia

Education

Universitas Indonesia, 3.99/4.00 GPA

July 2019 – January 2023

Bachelor's degree in Computer Science

Final Thesis: PDF (English edition)

Person in Charge of ICPC Multi-Provincial: COMPFEST 2021.
Valedictorian of the batch. Honors in Artificial Intelligence and taken image processing, information retrieval, machine learning, and data science courses.
Final thesis on cloud computing, exploring WebRTC, CRDT, Operational Transformations, and peer-to-peer architecture for real-time code editor

Papers

Dimension Analysis by Union-Find over Index Space: Flattening, Reshape Propagation and Operator Fusion in HFusion (Technical report, Huawei Technologies) · PDF
Three passes of the HFusion pipeline in the AscendNPU-IR compiler that treat shape facts as an equivalence relation over index positions: a union-find Dimension Analyzer that finds one consistent flattening per function, PropagateReshape, which moves aliasing reshapes out of operator chains, and OpFusion, which groups the cleaned-up graph for fusion. · AscendNPU-IR
Miteiru: Designing an Open-Source Subtitle-Immersion Player for Japanese, Mandarin, Cantonese and Vietnamese, Before and With AI Coding Assistants (Working paper) · PDF
The design of Miteiru, an offline video player that shows readings and glosses over every subtitle word; argues that Cantonese needs its own language mode, and compares 497 commits written without AI coding assistants with 136 written with them. · Source
PeerToCP: A WebRTC-Based Real-Time Collaborative Code Editor and Shared Shell (Bachelor's thesis, Universitas Indonesia (English edition), December 2022) · PDF
Builds a collaborative code editor with a shared shell three ways (client-server OT, client-server CRDT, and peer-to-peer CRDT over WebRTC) and benchmarks them with 2, 4 and 8 users for correctness, latency and resource use. · Source and data
Not Every Word: Measuring and Redesigning Burned-in Captions for Short-form Vertical Video (Working paper) · PDF
Reviews subtitle standards, reading research and East Asian variety-show captions, measures the captions of a real Shorts channel, and proposes a two-layer design: a verbatim subtitle track, and a burned-in caption that may step aside, add an emoji or picture, or change style. · Blog post

Professional Skills

Compiler Engineering & Toolchains (LLVM/MLIR infrastructure, optimization passes, code generation, LLVM tools (clang, mlir-opt, opt, llc, llvm-objdump, lld, ...), TableGen (.td files))
Build Systems & Development Tools (CMake, Ninja, Git, Docker, Ansible, CI/CD pipelines)
Programming Languages (C++ (primary), Python, Golang, Java, JavaScript/TypeScript)
Web Development (React.js, Node.js, Django, Spring Boot, Fastify, React Native, HTML/CSS/Markdown)
Databases & Infrastructure (PostgreSQL, MySQL, Nginx, Cloud Computing, Selenium automation)
Problem Solving & Algorithms (Competitive programming (Codeforces 2154 rating), data structures, algorithm design)