Tao H.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Professional Summary: * Having 2 years' experience in full life cycle of development of AI application using Langchain. * Having 19 years' experience in full life cycle of development & support mainframe and cloud applications. * Having rich experience on AI application development.(RAG + Agent) * Having rich experience on cloud skill stack (Java, Python, Microservice, Azure) * Having rich experience on mainframe skill stack (Cobol, PL/I, JCL, DB2, TWS/OPC, MQ, REXX, CICS, MVS, Z/OS) * Taking various kinds of role such as Solution Architect, Business Analyst and Application developer. * Having industry knowledge in Travel & Expense, Core-banking, and Credit Card. * Having Strong experience of mainframe modernization and mainframe application migration to cloud. Technical Experience: 1. Professional in Python and Java programming. 2. Professional in AI RAG and Agent application development through Langchain. 3. Having rich experience on public cloud (AWS, Azure). 4. Proficient in Cobol/PLI programming, having rich experience on Cobol + VSAM/QSAM, Cobol + DB2 and Cobol + CICS programming. 5. Proficient in JCL to develop batch job flow and use SORT for data processing. 6. Proficient in DB2 and database design and having rich experience on DB2 data load/unload and SQL development. 7. Proficient in MQ to implement event trigger function and data integration between mainframe servers. 8. Proficient in OMVS and Shell Script, having rich experience on programming with Shell script and Java in OMVS environment. 9. Proficient in file transmission (SFTP) and encryption/decryption processing. 10. Proficient in TWS/OPS to design event trigger and time trigger batch flow. 11. Proficient in REXX to use it to create automatic tool for repeatable manual operation. 12. Proficient in Java and Cloud application development. Having rich experience on Cobol to Java program conversion. 13. Having rich industry experience on Travel expense, and development experience on Core banking and Credit card. Career History: Kyndryl (2021/9 – 2024/12). Solution Architect IBM (2012/3 – 2021/9) Senior Software Engineer HP (2008/1 – 2012/3) Software Engineer IBM (2005/6 – 2008/1) Software Engineer Professional Certifications: Microsoft Certified: Azure Solutions Architect Expert Microsoft Certified: Azure Developer Associate AWS Certified Solutions Architect (Professional) Project Management Professional (PMP)