Software Engineer or Senior Software Engineer developing high throughput ads products in Tokyo. Focused on performance measurement, ranking, and user targeting in a profitable ad ecosystem.
About the role
- C++ Engineer leading modernization of legacy C++ applications into scalable products. Partnering with GenAI teams to reverse-engineer and forward-engineer into modern languages.
Responsibilities
- Partner with GenAI teams to trace execution paths, uncover implicit behaviors, and identify side effects within large legacy monoliths.
- Build comprehensive system documentation, including component diagrams, sequence flows, dependency maps, and API contracts derived from existing code.
- Define the target architecture and migration phases, using patterns such as the Strangler Fig Pattern for incremental re-platforming.
- Create and refine LLM prompts and retrieval contexts to accelerate code understanding, while validating GenAI outputs to ensure functional parity.
- Convert legacy C++ constructs (memory handling, concurrency, state management) into modern equivalents in the target language.
- Identify hidden dependencies and concurrency hazards. Ensure the new system meets SLAs for performance, security, and observability.
- Drive characterization testing and build regression suites and "golden datasets" to verify behavior during migration.
Requirements
- 5+ years of experience with C++, including Modern C++ (C++11/14/17; C++20 preferred).
- Proven track record of modernizing large, tightly-coupled codebases.
- Strong mastery of OOP, SOLID principles, and clean architecture.
- Advanced skills using gdb, lldb, or Visual Studio debugger for crash analysis and core dumps.
- Proficiency with CMake is strongly preferred.
- Firm grasp of data structures, algorithms, and performance optimization.
Job title
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