Portfolio

Selected engineering proof: what I built, the systems underneath, and the tradeoffs that mattered. Raintree product pages live at raintree.technology.

Agent Safety & Evals

Context & Developer Tools

Data & Intelligence Systems

Product SaaS

Systems & Low-Level

Music & Creative Systems

Finance SaaS / personal case study

BetterOff

household finance with approvals

What I built

Household finance workspace for account data, billing, cited analysis, and approval-gated changes.

Stack

Bun monorepo / Next.js 16 / Hono / Expo / Postgres + Drizzle / Stripe / Plaid / ccxt

Runtime

Next.js app, marketing site, API routes, Hono webhooks, and Expo client share workspace packages.
Provider sync jobs lease work, retry transient failures, and dead-letter invalid payloads.
Stripe subscription state maps back to household seats instead of living in a separate billing silo.

Data model

Provider payloads normalize into accounts, holdings, transactions, prices, liabilities, and billing state.
Household tenancy scopes members, provider credentials, account snapshots, seats, and entitlements.
Decimal-backed money and allocation math avoid floating-point drift in portfolio views.

Techniques

Postgres RLS plus server-side household guards for cross-tenant isolation.
Approval records and audit logs gate write-capable tool paths before mutation.
Architecture, route logging, RLS coverage, raw-Postgres, and sensitive-logging scripts run as CI gates.
TanStack Query, React Hook Form, Zod, and shared contracts keep app/API boundaries typed.

Verification

Postgres RLS policies and server-side household guards block cross-tenant account, holding, transaction, and user access.
AI outputs carry evidence links back to account and transaction facts instead of producing free-floating financial advice.
Decimal-backed calculations keep asset values, price snapshots, and allocation math out of floating-point drift.
Write-capable tool paths create approval records and audit logs before any mutation is accepted.

Portfolio

Selected engineering proof: what I built, the systems underneath, and the tradeoffs that mattered. Raintree product pages live at raintree.technology.

Agent Safety & Evals

Context & Developer Tools

Data & Intelligence Systems

Product SaaS

Systems & Low-Level

Music & Creative Systems

Finance SaaS / personal case study

BetterOff

household finance with approvals

What I built

Household finance workspace for account data, billing, cited analysis, and approval-gated changes.

Stack

Bun monorepo / Next.js 16 / Hono / Expo / Postgres + Drizzle / Stripe / Plaid / ccxt

Runtime

Next.js app, marketing site, API routes, Hono webhooks, and Expo client share workspace packages.
Provider sync jobs lease work, retry transient failures, and dead-letter invalid payloads.
Stripe subscription state maps back to household seats instead of living in a separate billing silo.

Data model

Provider payloads normalize into accounts, holdings, transactions, prices, liabilities, and billing state.
Household tenancy scopes members, provider credentials, account snapshots, seats, and entitlements.
Decimal-backed money and allocation math avoid floating-point drift in portfolio views.

Techniques

Postgres RLS plus server-side household guards for cross-tenant isolation.
Approval records and audit logs gate write-capable tool paths before mutation.
Architecture, route logging, RLS coverage, raw-Postgres, and sensitive-logging scripts run as CI gates.
TanStack Query, React Hook Form, Zod, and shared contracts keep app/API boundaries typed.

Verification

Postgres RLS policies and server-side household guards block cross-tenant account, holding, transaction, and user access.
AI outputs carry evidence links back to account and transaction facts instead of producing free-floating financial advice.
Decimal-backed calculations keep asset values, price snapshots, and allocation math out of floating-point drift.
Write-capable tool paths create approval records and audit logs before any mutation is accepted.

Selected projects

What I built

Stack

Selected projects

What I built

Stack