Carl Barrdahl

A food truck point-of-sale system where customers can discover nearby food trucks and place orders for pickup.

It was built with Next.js and Chakra-UI. The back end is connected to tRPC and Prisma to connect to a Postgres database hosted on Supabase.

Stripe is used to connect merchants and Mapbox to display the trucks on a map with a detailed information overlay.

Gitwork is a side project where GitHub issues can be funded with tokens. A developer can create a pull request (PR) on GitHub by tagging the problem to close.

When the PR has been merged, the developer can go to a page to claim the bounty. A GitHub API verifies if the signed-in user has, in fact, closed the issue and generates a signature for the user. This signature is sent to the smart contract to claim the bounty.

https://github.com/carlbarrdahl/gitwork

Pay Stripe invoices with USDC.

Built with React, Next.js, Stripe, RainbowKit, and Wagmi and deployed to Vercel. The customer connects their Stripe account, and their invoices are listed, and a payment link can be copied to share with clients to connect their wallet and transfer to the specified wallet address.

A dashboard was built to connect USDC transfers to matching invoices.

Kaly is a decentralized calendar and scheduling app. It's built with Next.js, Chakra UI, Ceramic, FullCalendar, and iCal specifications. I built it as a prototype to explore how DAOs could have shared calendars that users can subscribe to and where each user account is in control of their data.

Code and screenshots can be found at: github.com/carlbarrdahl/kaly

An IDO launchpad built for Defi & Cross-Chain Interoperability Hackathon event.

The application was built with React, Next.js, Chakra UI, and Ethers.js. Stripe Identity was used for KYC, so only verified identities were allowed.

Memosay is a meeting note-taking app for teams. It lets users capture notes right after client visits, with real-time transcription that displays text as they speak and allows them to edit before saving. I built it as a collaborative, organization-based workspace with Google and Microsoft sign-in, designed for the Swedish market.

Svarar Alltid is an AI receptionist for Swedish tradespeople. When a call is missed, the service answers via SMS within seconds, around the clock. It qualifies the lead with follow-up questions, then delivers a categorized summary to the business owner, sorted by urgency. I built it for small firms of 1-15 people: plumbers, electricians, builders, and carpenters. It pairs LLMs with a custom SIP-to-WebSocket voice gateway for real-time telephony.

Curator Studio is a permissionless capital-allocation protocol. Curators create weighted funding strategies, donors fund those strategies, and recipients claim their allocations on-chain, routing money to public goods and grantees without a trusted intermediary. The system spans smart contracts, a TypeScript SDK, and indexing infrastructure. It builds on ERC-8185/8186, Ethereum standards authored for off-chain entity resolution and claimable escrow.