Fujitsu announced the launch of Fujitsu Application Transform powered by Fujitsu Kozuchi, a generative AI service that analyzes source code and automatically generates design documents. The service reduces design document generation time by approximately 97%. It will be offere as a SaaS in Japan starting March 30, 2026.
The service analyzes COBOL and other source codes in existing legacy systems and automatically generates design documents to support system modernization. It builds on a software analysis and visualization service launched in February 2025 by standardizing analysis technology and design document generation know-how.
Fujitsu’s proprietary technology uses code analysis techniques on remaining design information and existing programs. It manages retrieval-augmented generation (RAG) with Fujitsu Knowledge Graph–Enhanced RAG for Software Engineering. By linking large volumes of source code, the system prevents omissions and hallucinations and generates highly accurate, easy-to-read design documentation.
The service reduces the time required to understand programming languages and generate design documents, which previously demanded extensive human effort, by approximately 97%, even without expert knowledge. Compared to analysis using only general generative AI, Fujitsu’s proprietary technology improves comprehensiveness by 95% by generating consistent design information without omissions from complex COBOL source code. It also achieves a 60% improvement in the readability of design documents compared to conventional methods.
Fujitsu plans to begin offering support services for the introduction of this service. In fiscal year 2026, it will sequentially introduce additional features including rebuilding existing source code for future use, automatically rewriting source code, and supporting operation and maintenance.
Toshihiro Horiuchi, Managing Executive Officer, SMBC Nikko Securities Inc., stated that the service advances the modernization of legacy systems by combining Fujitsu’s system development expertise with generative AI. SMBC Nikko Securities has conducted joint verification with Fujitsu on reverse-engineering design documentation for legacy languages including COBOL since fiscal year 2025 and recognizes the technology’s potential for practical modernization.
The service enables clearer understanding of current system specifications and characteristics to support the formulation and implementation of system modernization and migration strategies.
