Matthew Hendricks

Documentation & AI-Ready Knowledge Systems · Building Matchstick Replay

Documentation & AI-Ready Knowledge Systems

I build support, documentation, and AI-ready knowledge systems that make complicated technical work easier to understand, operate, and trust. My background spans six years leading product and technical support at NinjaTrader, customer engineering, technical writing, and hands-on software development — including Matchstick Replay and Stela, two systems I'm building now.

Core Capabilities

Support Operations

Support workflows, escalation paths, service knowledge, and team enablement.

Product Implementation

Customer setup, migration, technical troubleshooting, and adoption.

Documentation Systems

Information architecture, onboarding, docs-as-code, and API clarity.

Process Design

Turning repeated confusion into a workflow people can follow and improve.

Developer Tooling

Schema validation, CLI tools, and small utilities for documentation-heavy systems.

Technical Product Management

Customer discovery, product scope, cross-functional priorities, and delivery.

Selected Experience

Full-time Parent / Independent Builder — Career break (Sep 2022–Present)

Balanced limited consulting with caregiving through mid-2025. Since July 2025, focused on full-time parenting while maintaining a small set of independent tools and writing when capacity allows — most recently Matchstick Replay, a live market-data replay product, and Stela, an open-source RAG-provenance library.

Technical Consultant — Westmark.dev (Feb 2023–Jul 2025)

Delivered bounded consulting and product R&D projects across workflow-heavy MVPs, UX cleanup, and documentation systems while sharing caregiving responsibilities.

Customer Engineer — Privacy Dynamics (Oct 2021–Sep 2022)

Built a documentation website, supported early-stage customers, troubleshot UX/QA issues.

Contract Technical Writer — Microsoft (Feb 2020–Jun 2020)

Consolidated product and engineering knowledge into structured wiki content for an Office 365 support organization; collaborated with PMs and engineers and tracked work through Git and Markdown.

Business Analyst / Technical Writer — Premera Blue Cross (Apr 2019–Dec 2019)

Improved workforce-management efficiency by about 10% through process analysis; documented workflows and built SharePoint knowledge hubs.

Technical Services Manager — Ookla (Speedtest.net) (Apr 2017–Dec 2018)

Managed a 5-person technical services team supporting ~1,500 accounts; reduced customer response time by about 50% and helped customers migrate from Flash-based testing to browser-native WebSocket/XHR.

Product Manager / Technical Support Lead — NinjaTrader (May 2010–Jan 2017)

Led a support team of 15; maintained docs for ~40,000 users; contributed to C# debugging; translated customer workflow problems into product and documentation improvements.

Selected Projects

Matchstick Replay screenshot

Matchstick Replay

Active

A market-data replay tool — capture a live L2 crypto order-book feed, then scrub, seek, and replay it deterministically, reconstructing the same market state at the same timestamp every time.

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Stela

Active

RAG preprocessing library — chunks UTF-8 text and verifies every chunk's byte range and SHA-256 hash against the source. Benchmarked against LangChain (byte-offset drift on non-ASCII text) and on 15 CUAD contracts (100% stale-chunk detection vs. 0% baseline).

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Easy Walk screenshot

Easy Walk

Active

A free, ad-free PWA that times Japanese interval walking — voice cues, chimes, and a streak-tracking progress screen.

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FieldTest

Maintained

Schema validation toolkit for content-rich systems and documentation pipelines.

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Quarrel

Maintained

Dependency-free TF-IDF similarity toolkit. Works in Node, browsers, and Obsidian.

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Tools & Technologies

JavaScript / TypeScriptPythonRustHTML/CSSAstroNext.jsFastAPISupabaseCloudflareGitMarkdown publishing

Contact

Reach out about project-based, outcome-scoped work or to talk shop.

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