Carl Barrdahl

Builder — AI, Decentralized Systems, Funding Infrastructure

Gothenburg, Swedencarlbarrdahl@gmail.com@carlbarrdahlcarlbarrdahl

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 trades) and Fractional CTO for Curator Studio / support.eth (permissionless capital allocation protocol).

Available for protocol design, fractional CTO engagements, and AI infrastructure projects.

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 pilot with first customer within weeks of conception

Fractional CTO — Curator Studio / support.eth

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

Track Record

Engineering Lead — Gitcoin Ecosystem

2022 – 2025
  • Architected EasyRPGF — open-source Retroactive Public Goods Funding platform deployed by Filecoin, and others
  • 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 for 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 OpenAI Realtime API with zero transcoding. Powers the voice layer of Svarar Alltid.
  • EasyRPGF — Open-source retroactive public goods funding platform, deployed by Filecoin, and others

Background

Self-taught engineer with 15+ years of professional software development. Active contributor to Ethereum standards process and open-source ecosystem. Interests in AI governance, decentralized identity, digital sovereignty, and sense-making infrastructure.