I'm Ethan Baier, an independent developer with 7+ years across full-stack web applications, enterprise ecommerce, and games. You work directly with the person who writes the code.
One experienced engineer, scoping and building the thing. No account manager between you and the code.
From a marketing site to a multi-tenant admin app with auth, roles, scheduled jobs and a real backend. Angular, React, TypeScript, Node, Firebase and GCP.
Salesforce Certified B2C Commerce Developer with 4+ years inside a multi-brand SFRA platform: new storefronts, Page Designer components, Business Manager automation, audits and rescue work.
Simulation-heavy systems, reproducible runs, automated test harnesses and balance tooling. The engineering underneath a game rather than the art on top of it, so a small team can ship something with real depth.
Scheduled jobs, integrations and AI-assisted internal tooling built around your existing codebase, so it knows your quirks instead of producing generic output. Plus training your team to work the same way.
A shipped game, live web applications, and production ecommerce work. Client names are kept private; the engineering isn't.
Game · Steam
A roguelike basketball sim. Draft five alien misfits, stack cosmic relics, and coach a simulated squad through three escalating tournaments. Designed, built and shipped to Steam solo.
See the game →
Smart monitoring for hotel and restaurant refrigeration. I built the management platform behind it: companies, locations and devices, time-of-use electricity schedules, bulk onboarding, and the Cloud Functions backend tying it together.
Visit the site →
A native HubSpot Marketplace integration that syncs Whop payments, products and subscriptions into the CRM, with checkout links created right inside HubSpot. I was the lead architect.
View the listing →Look up any building covered by Colorado's Building Performance program and see its deadlines, fees and penalties, plus funding options and local energy consultants.
Visit the site →The same compliance lookup for Washington's Clean Buildings Performance Standard and Seattle's BEPS, covering over 22,000 buildings across 164 cities.
Visit the site →Every League of Legends champion's ARAM, Mayhem and URF balance in one fast reference. A scheduled job watches the official patch notes and refreshes the datasets, so it stays current with no work per patch.
Visit the site →Refactored a tangled Salesforce Commerce Cloud codebase into a clean core that powers many storefronts. Vendor and custom cartridges were separated, about 20 broken features rebuilt to survive upgrades, and each brand isolated on a shared SFRA base.
Client work · SFCC / SFRAAI tooling that reads a client's own codebase and automates the tedious ecommerce back-office work: microsite standup, product builds, promotions and preferences. A two-week microsite process became about an hour.
Client work · ImpEx / OCAPI, Node.jsReplaced a fragile catch-all raw-HTML component, where one typo could take down a whole landing page, with flexible responsive authoring components marketing could actually use.
Client work · Page Designer, ISML, SCSS
I've spent 7+ years building software end to end: front end, back end, infrastructure and the unglamorous integration work in between. Four of those years were deep inside a multi-brand Salesforce Commerce Cloud platform, where I'm a certified B2C Commerce Developer.
Outside client work I build my own things and ship them, which is the part of this job I like most. In August 2026 that meant putting a game on Steam by myself: design, code, art direction, balance, store page and launch.
When you hire EJ Applications you're hiring me, a US-based senior engineer. For larger engagements I bring in a small bench of trusted developers, but the person who scopes your project is the person who builds it.
Web app, ecommerce build, internal tool, or a game that needs real systems underneath it. Tell me what you're trying to ship and I'll tell you the fastest credible path to it.
Start a project