HAP
Development

Selected Work

A look at the custom software we've designed, built, and shipped — AI agents, dashboards, full-stack and mobile apps, internal tools, and the infrastructure underneath.

Most of this work is built for clients under NDA, so projects below are described by their purpose and stack rather than by name.

Tech Stacks & Concepts We Use

Languages

TypeScriptJavaScriptSwiftPythonSQL / PLpgSQLGLSLShell

Frameworks & UI

Next.jsReactViteSwiftUITailwindshadcn/uiThree.js / R3F

Data & Infrastructure

SupabasePostgreSQLSQLiteRedisPrismaVercelDockerTailscale

AI & Integrations

Vercel AI SDKOpenAIOllama (local LLMs)StripeTwilioResendSolana

Concepts

AI agentsAutomationData pipelinesRealtimeAuth & access controlPaymentsWeb scrapingData visualization

AI & Automation

Agents and tools that do real work — reading inputs, making decisions, and acting across systems.

AI Marketplace Listing Agent

Upload a single photo and an AI agent identifies the item, validates pricing against live marketplace data, writes optimized descriptions, and prepares the listing for publishing — turning hours of manual work into minutes.

Stack

Next.jsTypeScriptVercel AI SDKOpenAI (vision)PrismaTailwind

Concepts

AI agentsImage recognitionWeb scrapingMarket price validationStructured generation

Listing Automation Browser Extension

A Chrome extension that auto-fills listing forms across multiple marketplaces from a stored catalog of items and photos, with smart category mapping and programmatic image uploads.

Stack

ReactViteTypeScriptSupabaseChrome Extension APIs

Concepts

Browser extensionsContent scriptsDOM automationImage compressionCross-platform field mapping

Dashboards & Reporting

Pulling data out of spreadsheets, APIs, and exports — and turning it into something a team can actually act on.

Multi-Client Advertising & Sales Reporting

A weekly performance dashboard that aggregates advertising and sales data for multiple brands from spreadsheet exports, with in-browser uploads, campaign notes, and a cross-brand action and risk board.

Stack

Next.jsTypeScriptSupabaseVercel BlobRechartsXLSX

Concepts

Data ingestion pipelinesExcel parsingPIN-gated multi-tenant accessData visualization

Marketplace API Explorer

An internal tool for debugging and exploring ecommerce marketplace APIs — selling-partner and advertising endpoints — with signed requests and exportable results.

Stack

Next.jsTypeScriptAWS Signature v4XLSX

Concepts

Signed API requestsOAuth token flowsAPI integration & debugging

Trading Performance Dashboard

Imports brokerage CSV exports and derives closed trades and open positions using FIFO logic, with accurate long/short P&L across multiple interactive views.

Stack

Next.jsTypeScriptRecharts

Concepts

FIFO accounting logicLong/short P&LDynamic file discoveryFinancial analytics

Finance Dashboard

A fast, local-first financial dashboard with an embedded database and interactive charts for tracking performance without a heavy backend.

Stack

Next.jsTypeScriptSQLiteRechartsshadcn/ui

Concepts

Local-first dataEmbedded databaseData visualization

Full-Stack & Mobile Apps

Complete products — web and native — from database schema through payments, messaging, and the screens users touch.

Social Accountability Challenge Platform

A social habit-challenge product where friends commit to daily goals together: daily photo check-ins, streaks, weekly standings, and auto-renewing challenges — with payments, SMS/email reminders, AI-generated rules, and a native iOS companion app.

Stack

Next.jsTypeScriptSupabase / PostgresSwift (iOS)StripeTwilioResendVercel AI SDKPlaywright

Concepts

Full-stack productNative mobileRealtimeMembership state machinesPaymentsTransactional SMS/emailEnd-to-end testing

Membership Directory

A searchable member directory with bulk spreadsheet import, filtering, and clean CRUD management for organizations.

Stack

Next.jsTypeScriptSupabaseXLSXshadcn/ui

Concepts

CRUDBulk importAuthenticationSearch & filtering

Coupon Distribution App

An account-based coupon claiming app with secure sign-in and automated email delivery of codes to customers.

Stack

Next.jsTypeScriptSupabase (SSR auth)Nodemailer

Concepts

Server-side authSession cookiesTransactional email

Web3 Social & Token Apps

Realtime social applications integrating blockchain wallets and on-chain interactions, backed by a relational database and live socket updates.

Stack

ReactViteTypeScriptSolana web3.jsPostgreSQLWebSockets

Concepts

Blockchain integrationWallet connectivityRealtime sockets

Sites, Tooling & Infrastructure

The supporting cast — marketing sites, internal tools, and the servers everything runs on.

Marketing Sites & Landing Pages

Custom marketing sites (including this one) built with design systems, motion, and 3D/WebGL backgrounds — fast, responsive, and SEO-ready.

Stack

Next.jsTypeScriptTailwindshadcn/uiThree.js / React Three FiberGLSL shaders

Concepts

Design systemsWebGL & particle effectsResponsive UISEO

Gated Client Demo Hub

An internal app that hosts client demos behind per-client PINs and tracks every view, unlock, and demo open — so we can share work privately and see engagement.

Stack

Next.jsTypeScriptUpstash Redis

Concepts

Signed httpOnly cookiesAccess controlAnalytics tracking

Review Management Tool

An internal tool for managing and posting product reviews, with immediate UI feedback kept in sync with server writes.

Stack

JavaScriptHTMLREST APIs

Concepts

Optimistic UI updatesServer state syncing

Self-Hosted AI Server Infrastructure

A reproducible setup for a shared on-prem AI server running local LLMs over private mesh networking, with containerized services and infrastructure tracked as code.

Stack

DockerOllamaTailscalelaunchdHomebrewShell

Concepts

DevOpsSelf-hosted LLMsMesh VPN networkingInfrastructure as code

Have something in mind?

If you can describe the problem, we can build the tool. Tell us what you need and we'll figure out how to ship it.