Bui Thanh Chien · Freelance IT engineer
17 years in finance · Vietnam (GMT+7)
I build and fix the small systems a business runs on: WordPress, landing pages, Excel and Google Sheets, Python automations, fillable forms and English-Vietnamese translation. Every job comes with the checks I ran.
Small and medium jobs are welcome. I quote a fixed price when the scope is clear and say so when it is not.
Errors, speed, custom features, WooCommerce and Elementor changes. Staging first, backups before any change.
One goal per page, fast on phones, clear calls to action and forms that say what to fix.
Formulas, dashboards, VBA and Apps Script, budget and finance models that other people can maintain.
CSV and Excel clean-up, API connections and migrations between platforms, checked row by row.
Forms that work on a phone, add up totals themselves and are ready for e-signature.
A crawl of your site, the issues that matter ordered by impact, then the fixes if you want them.
Business, finance and IT documents, with the terms kept consistent from start to finish.
Prices are starting points for small, clearly described jobs. You get a fixed quote after I read the details; hourly work is $20 to $30 per hour.
Demo projects I built to show how I work. The brands are fictional; the code, the pages and the tests are real.
A long sales page with one goal: book a seat. Animated proof in the hero, a before/after table, pricing, FAQ and a sign-up form.
8/8 browser tests · 390 px phone · keyboard · reduced motion · voiced walkthrough video
How it was built and tested →
Live savings and payback for an LED retrofit, a five-year chart, and an "email me this estimate" form stored in WordPress.
Same results in PHP 8.3, PHP 7.4 and JavaScript · 5/5 end-to-end tests · server recalculates every lead
How it was built and tested →
Crawl, titles, descriptions, canonicals, broken links and schema, delivered as a PDF and a filterable spreadsheet.
10 findings · each checked on the page · ordered by impact and effort
How it was built and tested →
A product quiz for Instagram traffic: branching questions, a lead step and a personal recommendation worked out on the server.
16 unit · 21 integration on 2 WordPress versions · 11 browser tests
How it was built and tested →
Galleries that open full screen, two languages, a contact page built for quick bookings, and a layout that holds on phones.
146 browser checks · desktop and 390 px · English and Serbian
How it was built and tested →
Pick a region and every figure, the month table against target, the rep ranking and the charts follow.
2,506 formulas, 0 errors · every figure cross-checked in Python
How it was built and tested →
Seven day rows where hours fill themselves from the times entered, a weekly total, service tick boxes and two signature boxes.
8/8 form tests · hours formula 6/6 cases · no overlapping fields
How it was built and tested →
Dollar and date formats, single-choice groups, and signer fields named for Adobe Acrobat Sign.
8/8 form tests · entries kept after save and reopen
How it was built and tested →Posts exported to a WordPress import file with dates, slugs and images intact, and subscribers to a clean CSV.
8/8 tests · 6/6 posts identical after a real WordPress import
How it was built and tested →Seventeen years of finance IT taught me that a change is finished when it has been checked, not when it has been made.
I restate the job, the result you expect and the questions that matter before I start.
Staging site, copy of the file or test data. Never your live system first.
Desktop and phone, the real inputs you will use, the cases that usually break.
The result, the evidence and short notes on how to use and change it.
Checked against your requirement, on the devices and data you use.
Screenshots, test output or a before/after, so you can see what was checked.
What changed, how to use it, and what to watch when you change it later.
Vietnam, GMT+7. I reply within a few hours on working days and plan delivery around your time zone.
Yes. A one-hour fix gets the same care as a two-week project.
I prefer a staging copy. If there is none, I take a backup first and change only what we agreed in writing.
If the result does not match what we agreed, I fix it at no extra cost. New requests get a separate quote.
Through Upwork or Fiverr, so your payment is protected until you approve the work.
They are demo projects I built to show my work; the brands are fictional. Client work stays private unless the client agrees.
Send the details and the deadline on Upwork, Fiverr or by email. I reply with questions or a plan and a price.
Email: buithanhchiencntt@gmail.com