I will fix and optimize your python and sql data workflows

Hong Kong

I speak Chinese, English

Data Warehousing, Data Modeling and ETL Engineer

I help teams design data warehouses and dimensional models, build reliable ETL/API pipelines, and fix Python or SQL data workflows. I have 7+ years of data engineering and analytics experience across ...
About this Gig

When a Python job fails, a SQL query slows down or report totals stop matching, I help you find the cause and get the data workflow back into a usable state.


I have 7+ years of data engineering and analytics experience, including reconciliation, workflow recovery and SQL optimization.


Diagnosis gives you reproducible findings and a repair plan. Repair includes a fix for one agreed issue, regression checks and handover notes. The improvement package addresses one agreed performance or reliability goal, with before-and-after checks and documented changes. Specific speed or cost reductions depend on the system and are not guaranteed.


The FAQ defines the code and workflow limits. I work on copies or in a staging environment and preserve original inputs. New features, full rewrites, data-entry work, scraping and production changes need a separate scope.


Send the error or slow query, a sanitized example and the expected output before ordering. We will confirm the issue, access and acceptance criteria. Revisions cover the agreed task.

Technology:

Excel

•

Python

•

Other

Expertise:

Data flow

•

Data manipulation

•

Data validation

•

ETL

My Portfolio