Mai Tan Phat

Business Analyst shipping AI and LLM products — knowledge-base agents and document automation for Japanese clients — backed by five years building core insurance systems on the mainframe.

COBOL and mainframe developer with five years on production insurance systems — IBM z/OS, DB2, CICS and the Ingenium core — now documenting and modernising legacy COBOL with AI.

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Currently a Business Analyst at FPT Software, building AI agents for Japanese clients. Open to BA (AI / product) and COBOL / mainframe roles.

7 yrs

IT experience

VN / JP / EU

Client markets

AI / LLM

BA on agent products

About

For the last two years I have shipped AI and LLM products as a business analyst — document-processing and knowledge-base agents for Japanese clients — owning requirement elicitation, functional specs, UI/UX design and client demos. Before that, five years as a mainframe developer in life and non-life insurance gave me rare depth in regulated domains and legacy systems: policy lifecycle, claims and batch.

I am a COBOL and mainframe developer with five years on production insurance systems — four on IBM z/OS (COBOL, DB2, CICS, JCL) for a French non-life insurer, plus a year on the Ingenium life-insurance core. I am known for reverse-engineering undocumented legacy code to deliver new functionality, and I now apply that depth on AI projects that document and modernise legacy COBOL.

Experience

04/2024 - Present

Business Analyst

FPT Software

Sole BA on an 11-person team building an LLM knowledge-base agent for a Japanese client; run client demos, write functional specs and design the UI/UX.
Earlier, the mainframe domain authority on an AI agent that reverse-engineers legacy COBOL — defined correctness criteria and validated its output; PoC accepted by the client.
Mainframe domain authority on an AI agent extracting business logic, call-graphs and documentation from a large, decades-old COBOL codebase; validated output against real COBOL/JCL/DB2 behaviour. PoC accepted.
Currently BA on an LLM knowledge-base agent for a Japanese client.

05/2023 - 04/2024

COBOL Developer, Ingenium

Dai-ichi Life Insurance Vietnam

Built surrender-charge logic for unit-linked life products and generated customer documents; deepened life-insurance domain knowledge.
Maintained the Ingenium life-insurance core (COBOL on Unix, Oracle, Perl batch); built surrender-charge logic for unit-linked products.
Generated customer documents and extracted policy data via Crystal Reports.

04/2019 - 04/2023

COBOL Developer → Senior Consultant

Capgemini Vietnam

Four years on a French non-life insurer's z/OS platform, working directly with the client; reverse-engineered undocumented legacy code to ship new CICS screens.
Maintained and developed large-scale z/OS applications (COBOL, DB2, CICS, JCL) for a French non-life insurer over four years.
Reverse-engineered undocumented legacy code to deliver new CICS screens; worked directly with the client across two delivery teams.

Toolkit

The active viewpoint moves the most relevant group to the front.

Business & delivery

Requirements analysis Stakeholder management Agile / Scrum UI/UX design Documentation Cross-functional coordination

Mainframe

COBOL JCL / Batch DB2 / SQL IBM z/OS CICS / VSAM Abend-AID FileAid RDi

AI & modernisation

AI agents & LLMs Knowledge base / RAG Prompt design Legacy modernisation English French

Download my CV

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Selected CV

BA / Vice PM

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A side project: VKey

VKey is an open-source Vietnamese input utility I build and maintain as a side project — a way to stay hands-on with modern application development beyond the mainframe. It ships as a code-signed Windows app, with signing provided for open-source projects by SignPath.io.

View on GitHub Code signed for free by SignPath.io

phatMT97 / VKey

Type: Open-source side project
Purpose: Vietnamese input
Signing: SignPath.io
Status: Maintained

Let us talk.

Whether it is a BA or PM role, a mainframe that needs care, or AI-assisted legacy work, I am happy to hear from you.

phatmtp1997@gmail.com LinkedIn