I build web features, connect APIs and fix Python workflows.
I can take a defined feature or defect from reproduction to a tested implementation and clear handover. My preferred stack is TypeScript, React/Next.js and Python, with SQL, webhooks, n8n, Make and Airtable.
Hanoi, Vietnam (UTC+7) · 10–20 hours/week for remote project work
Problem: a document style containing quotes could be created but could not be looked up correctly.
My contribution: changed the affected XPath lookups to use bound variables, passed them through the XML wrapper, and added regression coverage for quoted names and injection-like input. The maintainer reviewed the edge cases and merged the change.
Review merged PR #131 · Read the reproduction and fix
Relevant work: Python debugging, document processing and regression tests. Open-source contribution.
Problem modeled: a reviewer needs to see which requirements have evidence and which still block a release.
My contribution: built the HTML/CSS/JavaScript interface, the acceptance evaluator and its tests. The UI includes ready, loading, empty and error states. A keyboard-focus fix keeps Retry from leaving focus on a hidden control.
Try it: open the live interface, select Error, then Retry. Inspect the loading state and continue navigating with the keyboard.
Relevant work: frontend features, internal tools and accessible error recovery. Independent technical sample with fictional release data; no backend or live deployment control.
Problem modeled: a repeated event or temporary API failure should not silently create conflicting records or trigger unlimited retries.
My contribution: built the Python/SQLite processing boundary, signature validation, duplicate/conflict checks, bounded retries and regression tests. The local CLI preserves event identity across restarts and requires explicit recovery after exhausted retries.
Inspect it: follow the runnable scenarios to compare a successful event, a duplicate and an exhausted retry.
Relevant work: API integrations, automation debugging and data validation. Independent sample with synthetic events and a simulated CRM. The preview API's ledger is scoped to one request; it does not provide cross-request durability.
- SkillArena — independent product. Built a Next.js, React and TypeScript sales-practice application with scenario simulation, transcript-backed debriefs, drills and rematches. Private implementation.
- Workforce attendance — private business project. Built an attendance application for a Vietnamese automotive operation.
- Management reporting — private business work. Built repeatable reporting from Odoo and spreadsheet data, with source tracking, validation and Excel/HTML/PDF outputs.
These descriptions identify my work; private project details and business results are not presented as public case studies. My independent software and automation work began in August 2023.
A first milestone can be one web feature, one failing API path or one reporting workflow. Once we agree the brief, I return the implementation, the checks used to verify it, and handover notes covering remaining limits and recovery.
Send the current behavior, the result you need and the relevant stack. I'll identify the missing inputs and propose a scope, acceptance checks, price and delivery schedule for your review.
I use Codex-assisted implementation, testing and writing. We agree tooling and data requirements before sharing private project material. Working hours and the implementation start date are agreed for each engagement.
- MCP workflow status — distinguish dispatch, completion, rejected input and worker failure in a runnable local example. Fictional CSV data.
- Codex Plugin Check — experimental CLI and GitHub Action for skills/hooks discovery against a pinned Codex release. Strict isolation is Linux-only; discovery is not a security certification.
- HandoffLab — a local, unreleased failure-replay prototype extending the webhook sample.
- Editable workshop presentation — an independent presentation concept using fictional data.