Carl Barrdahl

I design and build fullstack products. AI, onchain systems, and funding infrastructure.

Gothenburg, Sweden·carlbarrdahl@gmail.com·GitHub·LinkedIn·Telegram·CV

About

I build infrastructure that connects digital systems to real-world impact — AI services for tradespeople, funding protocols for public goods, and Ethereum standards for identity and capital allocation.

Currently: Founder of Svarar Alltid (AI receptionist for Swedish tradespeople).

Available for full-stack and AI engineering, product design, and onchain / protocol work.

Selected Work

Stadsvision

designed & built

Photograph a street in Gothenburg, say what you would change (trees, a wider sidewalk, somewhere to sit), and a multimodal model re-renders that same street with the change in it. Proposals publish to a shared map where anyone can drag between before and after, comment, and build on each other's ideas.

Stadsvision product overview across three mobile screens
Published visions on the map, the before/after slider, and a single vision with its description and comments.

Curator Studio

designed & built

Curators publish funding strategies: a list of recipients with weights, so a donation splits onchain by share and nobody holds the money in between. Anyone can fork a strategy and propose a rebalance, which lands in the discussion as a current vs proposed diff for the curator to accept or reject. I designed and built it end to end, from the Solidity to the allocation UI.

Create-strategy form with a live allocation preview
Setting recipients and weights, with the resulting split previewed live beside the form.
A fork proposing a rebalance, shown as current vs proposed allocations
A fork proposing a rebalance, with each recipient's current and proposed share side by side.

Memosay

designed & built

Field notes for people who spend the day visiting customers. It reads your calendar and nudges you to record when a meeting ends; you talk, the transcript runs live on screen, and the saved note comes back as a summary with the customer, the contacts and the next steps, ready to email. Shipped as an installable PWA with web push.

Memosay product overview across three mobile screens
Today's notes, calendar meetings waiting to be recorded, and a finished note with its summary and next steps.

Core Competencies

Engineering

TypeScript · React · Next.js · Node.js · Solidity · EVM · PostgreSQL · System Architecture · DevOps

Decentralized Systems

Smart Contract Design · Protocol Design · Mechanism Design · Quadratic Funding · RPGF · Decentralized Identity (SSI) · ENS · Token Engineering

AI & Infrastructure

AI Agents · LLM Integration · Open Source · Auditable Digital Infrastructure

What I'm Building

Founder — Svarar Alltid

2026 – Present

Gothenburg, Sweden

  • AI-powered receptionist service for Swedish tradespeople — automated SMS lead qualification from missed calls
  • Full-stack: Mastra AI framework, 46elks telephony, Next.js dashboard, Drizzle ORM
  • Designed and launched the pilot within weeks of conception
  • First three-month pilot (4 businesses): 58 qualified leads and 189 conversations from 134 callers, real traffic that would otherwise have been missed calls

Track Record

Lead Architect — Curator Studio / support.eth

2024 – 2026
  • Permissionless capital allocation protocol with curated funding strategies and ENS integration
  • Architected protocol design, smart contracts, and frontend infrastructure

AI Engineer — DeepGov (research)

2025
  • Built an AI multi-agent pipeline that reviews funding applications and returns scored, structured assessments through a review dashboard, with humans keeping the final decision
  • Deployed for Gitcoin's GG23 round; the same project won Bhutan's first international hackathon (GovTech Bhutan, backed by the Ethereum Foundation)

Engineering Lead — Gitcoin Ecosystem

2023 – 2024
  • Architected and built EasyRPGF, the open-source retroactive public goods funding platform Celo and Filecoin used to distribute 250,000 CELO and ~1.05M FIL (about $3.5M) across ~290 project grants
  • Built grants and funding interfaces for the Ethereum ecosystem — including retroactive public goods funding tools, grant round management, and allocation dashboards used by Gitcoin, Filecoin, and others
  • Authored ERC-8185 and ERC-8186 — Ethereum standards for identity resolution and deterministic pre-funding

Smart Contract & Full-Stack Engineer — Freelance / Contract

2018 – 2022
  • Delivered decentralized applications across DeFi, governance, and public goods domains
  • Built open-source tooling for Ethereum ecosystem — funding mechanisms, governance frameworks, identity systems
  • Collaborated with DAOs, foundations, and protocol teams on system design and implementation

Standards & Open Source

  • ERC-8185 & ERC-8186 — Ethereum Standards Track drafts for an off-chain entity registry and deterministic identity accounts (Draft, 2026)
  • sipstream — Open-source SIP voice gateway for AI. Bridges traditional telephony (G.711/RTP) to any WebSocket/AI backend (OpenAI example included) with zero transcoding. Powers the voice layer of Svarar Alltid.
  • EasyRPGF — Open-source retroactive public goods funding platform, used by Celo and Filecoin to distribute about $3.5M across ~290 grants