Chase Holdren

Full-stack developer. Recently: software for a barrel shop.

C6 is the order-to-shipment tracking app I built for Carbon Six Barrels. Drag or use ← → to browse its screens; scroll for the story.

The storyResume

OverviewFulfillment health at a glance: total, pending-procurement, and ready-for-production counts, with priority actions for the floor.

C6

Order-to-shipment production tracking for a precision barrel maker. Contract software developer, Oct 2025 – Present.

Carbon Six Barrels machines rifle barrels to order. Orders arrived from two storefronts, production was tracked on spreadsheets, and nobody could say where a barrel was without walking the floor. C6 connects the storefronts to the shop: every order gets a route, every line item gets a printed traveler with barcodes, and every machinist scans in and out of each step. The result is live status per order and real step timings for planning.

  1. Integrations

    1

    Orders arrive

    WooCommerce and Wix orders sync in automatically. Product options become production specs through per-store mappings.

  2. Production routes

    2

    Routed

    Each line item is assigned a master route. For example: Machining, Gunsmithing, Finishing, 2nd Gunsmithing, Shipping.

  3. The traveler

    3

    Traveler printed

    A one-page traveler with the spec header and START/STOP barcodes for every step is rubber-banded around the barrel and follows it through the shop.

  4. Scanner activity

    4

    Scanned on the floor

    Machinists scan START and STOP at each station on the installable scanner app. Out-of-sequence scans are rejected on the spot.

  5. Reports

    5

    Visible

    Live order status, bottlenecks, and real step timings replace the spreadsheet — for every organization on the platform.

  • WooCommerce and Wix orders import automatically; per-store spec mappings turn product options into the specs machinists see on travelers and the scanner.
  • Master production routes (Machining → Gunsmithing → Finishing → 2nd Gunsmithing → Shipping). The machinist flow only sees the order info that is relevant to the current step.
  • One-page order travelers with START/STOP barcodes per step, printed straight from the order.
  • Installable PWA scanner: scan a barcode, C6 resolves the order, step, and direction and validates the sequence.
  • Throughput, lead-time, bottleneck, and time-per-member reports derived from scan events.
  • Multi-tenant with Admin / Shop Manager / Machinist roles and barcode-key logins for the floor; PostgreSQL row-level security scoped by organization.
  • Order ingestion webhooks with per-organization keys for custom integrations.

React 19TypeScriptViteTanStack Router + QueryRadix UIFirebase Data Connect (PostgreSQL + GraphQL)Hono on BunCloud FunctionsGemini analyticsPlaywrightPWA

The traveler

Printed per line item; every barcode below is a scan target.

Order traveler for WC-33541-1: spec header and START/STOP barcodes for Machining, Gunsmithing, Finishing, 2nd Gunsmithing, Shipping
One traveler per line item. Scanning a START or STOP barcode at a station records the step for that order.Open the PDF

Every screen

  • Overview — Fulfillment health at a glance: total, pending-procurement, and ready-for-production counts, with priority actions for the floor.
    OverviewFulfillment health at a glance: total, pending-procurement, and ready-for-production counts, with priority actions for the floor.
  • Orders — Every imported order with its route, current step, and specs. Expand a row to edit specs, add shop notes, or print its traveler.
    OrdersEvery imported order with its route, current step, and specs. Expand a row to edit specs, add shop notes, or print its traveler.
  • Production routes — Master routes define the steps a barrel moves through and which fields the scanner shows at each one.
    Production routesMaster routes define the steps a barrel moves through and which fields the scanner shows at each one.
  • Scanner — The shop-floor PWA. A USB or camera scan of any traveler barcode resolves the order and starts or stops the step.
    ScannerThe shop-floor PWA. A USB or camera scan of any traveler barcode resolves the order and starts or stops the step.
  • Scanner activity — Every scan, newest first — including rejected ones, so a step scanned out of order is visible immediately.
    Scanner activityEvery scan, newest first — including rejected ones, so a step scanned out of order is visible immediately.
  • Reports — Lead time, throughput, bottleneck, weekly step durations, and time per member, all derived from scan events.
    ReportsLead time, throughput, bottleneck, weekly step durations, and time per member, all derived from scan events.
  • Integrations — Commerce sync settings, order-spec mappings per platform, and a documented ingestion API with per-org keys.
    IntegrationsCommerce sync settings, order-spec mappings per platform, and a documented ingestion API with per-org keys.
  • Members — Roles, invitations, and barcode keys so machinists can log in with a scan instead of a password.
    MembersRoles, invitations, and barcode keys so machinists can log in with a scan instead of a password.
  • Organizations — Multi-tenant from day one: every query is scoped by organization at the database layer.
    OrganizationsMulti-tenant from day one: every query is scoped by organization at the database layer.
  • Settings — Account profile and password reset.
    SettingsAccount profile and password reset.

Other work

The shared space with avatars in it.

frostbase.app

Real-time 3D virtual chat room

A shared 3D space where visitors pick a custom avatar and chat in real time. Built to learn Three.js properly — the same toolkit behind this site.

  • Three.js
  • react-three-fiber
  • Socket.io
  • GCP App Engine

Visit frostbase.app

Log game data on the left; matchup performance on the right.

Smashdex

Match history and matchup analytics for Smash players

A progressive web app for Super Smash Bros. players to log matches and see which characters and stages they actually win on.

  • React
  • Firebase
  • d3
  • PWA

Visit Smashdex

The 8×32 canvas in the browser, and the physical matrix it drives.

Web LEDs

Draw in the browser, see it on a physical LED matrix

An interactive art installation: anyone with the link paints pixels in a web page and an Arduino-driven 8×32 LED matrix lights up to match.

  • React
  • Firebase
  • Arduino
  • 8×32 LED matrix

Visit Web LEDsSource on GitHub

Experience

Full-stack developer with 8+ years building production web applications with React, TypeScript, and Node/NestJS/Express — mostly on fully remote, distributed teams. Background spans cloud security tooling, internal SaaS platforms, and Microsoft Teams integrations, with a focus on front-end architecture, API design, and developer-facing tools. Comfortable owning features end-to-end, from architecture and testing (Jest, React Testing Library, Playwright, Vitest) through deployment.

  1. Software Developer (Contract, Remote)

    Carbon Six Barrels

    Oct 2025 – Present

    • Designed and deployed an AI-powered phone answering system for a precision firearms manufacturer, handling 15 inbound calls/day and cutting missed calls during business hours by an estimated 50%.
    • Built a full-stack inventory management and production-time tracking app used across the shop floor by 20 machinists/gunsmiths, replacing manual spreadsheet tracking.
    • Split time between remote work and periodic onsite weeks to gather requirements directly from shop-floor and business stakeholders.

  2. Software Developer

    Tamnoon, Inc. (Remote)

    Jul 2024 – May 2025

    • Built a cloud security alert management web app in React/TypeScript and NestJS on a team of 3, used to triage and remediate 1000+ cloud security findings per month.
    • Led frontend development of an AI-generated remediation task feature.
    • Built a pixel-accurate dashboard and report generation feature using Puppeteer for PDF export, used by security teams for stakeholder reporting.

  3. Full Stack Developer

    Frameable Inc. (Remote)

    Mar 2022 – Jan 2024

    • Engineered a virtual office web app with video calls and screen-sharing (Vue, Express), supporting hundreds of users across client organizations.
    • Migrated the app into native Microsoft Teams plugins built on the Microsoft Graph API.
    • Diagnosed and resolved plugin load-time issues within Teams' sandboxed runtime, cutting initial load time by an estimated 40%.

  4. Application Developer

    Insight2Profit

    Aug 2019 – Mar 2022

    • Built an internal tool (React, TypeScript, Material UI) letting non-engineer Pricing Analysts build pricing/quoting models and publish them directly as APIs — used by 30 analysts.
    • Cut developer involvement in ad hoc pricing requests, reducing turnaround for new pricing models from days to hours.
    • Benchmarked in-browser editor performance against Monaco and shipped a custom lightweight editor instead, cutting bundle size by an estimated 80% while keeping syntax highlighting and autocomplete via the Language Server Protocol.

  5. Software Engineer – Developer II

    Hyland Software (Lawlogix)

    Jul 2016 – Aug 2019

    • Directed a complete rewrite of a legacy 4D/Python API to C#/.NET, working directly with Entity Framework, PostgreSQL, Jenkins, and Docker.
    • Established core code quality and automated testing standards adopted as the team's enterprise baseline.
Frontend
ReactVueTypeScriptJavaScriptReduxHTMLCSSMaterial UIVite
Backend
Node.jsExpressNestJSC#.NETGraphQL
Testing
JestReact Testing LibraryPlaywrightVitest
Infra & Tools
PostgreSQLDockerJenkinsFirebaseAWSGCPAzureMicrosoft Graph APICI/CDGithub Actions/Workflows

Bachelor of Computer Information Systems — Kent State University, Kent, OH, 2016

Get in touch

Akron, OH. Remote, with onsite weeks when the work needs it.