I build reliable web applications, data workflows, integrations, and automation systems with React, TypeScript, Node.js, Python, APIs, and structured testing. I turn technical concepts and business requirements into testable software, clear milestones, measurable acceptance criteria, and handoff-ready documentation. I can help with focused MVPs, API integrations, data cleanup and import pipelines, technical SEO, dashboards, bug fixes, and workflow automation. My work emphasizes reproducible tests, secure handling of data and credentials, clear scope control, and dependable delivery.…

Ken Yu

I build reliable web applications, data workflows, integrations, and automation systems with React, TypeScript, Node.js, Python, APIs, and structured testing. I turn technical concepts and business requirements into testable software, clear milestones, measurable acceptance criteria, and handoff-ready documentation. I can help with focused MVPs, API integrations, data cleanup and import pipelines, technical SEO, dashboards, bug fixes, and workflow automation. My work emphasizes reproducible tests, secure handling of data and credentials, clear scope control, and dependable delivery.…

Available to hire

I build reliable web applications, data workflows, integrations, and automation systems with React, TypeScript, Node.js, Python, APIs, and structured testing. I turn technical concepts and business requirements into testable software, clear milestones, measurable acceptance criteria, and handoff-ready documentation. I can help with focused MVPs, API integrations, data cleanup and import pipelines, technical SEO, dashboards, bug fixes, and workflow automation. My work emphasizes reproducible tests, secure handling of data and credentials, clear scope control, and dependable delivery.

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Work Experience

Independent Full-Stack & Automation Developer at Independent R&D
January 1, 2025 - Present
Design and build testable web applications, API integrations, data workflows, technical SEO tooling, dashboards, and automation systems. Translate product requirements into clear milestones and measurable acceptance criteria; implement reproducible tests, failure handling, audit trails, and handoff-ready documentation.

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Industry Experience

Software & Internet
    WordPress REST API Booking Logic Proof
    Built a self-contained WordPress/PHP booking-domain proof that enforces a Thursday-only booking rule with timezone and daylight-saving handling, HMAC-authenticated REST requests, replay protection, deterministic validation, and documented integration boundaries. The package includes automated regression tests and a static audit: 25/25 assertions and 16/16 checks passed. This is an independent synthetic technical proof, not a client deployment, and it contains no customer data. I designed the domain logic, REST security controls, tests, acceptance matrix, and handoff documentation. WordPress PHP RESTAPI WebDevelopment BackendDevelopment SoftwareTesting…
    WordPress REST API Booking Logic Proof

    Built a self-contained WordPress/PHP booking-domain proof that enforces a Thursday-only booking rule with timezone and daylight-saving handling, HMAC-authenticated REST requests, replay protection, deterministic validation, and documented integration boundaries.

    The package includes automated regression tests and a static audit: 25/25 assertions and 16/16 checks passed.

    This is an independent synthetic technical proof, not a client deployment, and it contains no customer data. I designed the domain logic, REST security controls, tests, acceptance matrix, and handoff documentation.

    #WordPress #PHP #RESTAPI #WebDevelopment #BackendDevelopment #SoftwareTesting

    Review-Gated Document Extraction Pipeline

    Built a reproducible Python pipeline for extracting and normalizing invoice fields, preserving provenance and confidence, routing uncertain records to human review, and producing an idempotent JSON Schema result contract.

    Across eight synthetic fixtures, all 18 automated tests passed, no incorrect field was automatically accepted, and every deliberately incorrect document was routed to review.

    Independent technical proof; no live OCR, customer-data, or production-deployment claim.

    Safe CSV Import & Deterministic Deduplication

    Built a dependency-free Python workflow for validating one UTF-8 CSV, previewing a dry run, resolving duplicate keys deterministically, protecting newer records from stale updates, enforcing role checks, recording a hash-linked audit trail, and performing a guarded byte-exact rollback.

    The synthetic demonstration processed 6 rows into 4 unique records, collapsed 2 duplicates, and passed all 11 automated tests, including audit-integrity and rollback checks.

    Independent technical proof; not a production database migration.

    SEO Migration Validation Lab

    Built an offline technical SEO migration auditor that generates a machine-readable audit, a human-readable risk report, and a redirect map for capped URL inventories.

    It checks redirect loops and chains, non-200 targets, canonical and indexability conflicts, robots directives, sitemap integrity, and Article structured data. In a deliberately flawed synthetic fixture it identified 17 issues; after remediation the same fixture produced 0, and all 14 automated tests passed.

    Independent technical proof using reserved .invalid data; no live-site ranking or traffic claim.