Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Senior Web3 full-stack engineer with 7+ years of production experience building blockchain-powered applications, dashboards, and integrations across Ethereum and Solana. I specialize in shipping user-facing dApps, wallet integrations, NFT platforms, and custom Web3 tooling — from frontend UX to smart contracts and backend services. Previously worked with enterprise and startup teams to deliver secure, scalable blockchain products used by real users. Available for short-term builds, integrations, and targeted Web3 development work.…Senior Web3 full-stack engineer with 7+ years of production experience building blockchain-powered applications, dashboards, and integrations across Ethereum and Solana. I specialize in shipping user-facing dApps, wallet integrations, NFT platforms, and custom Web3 tooling — from frontend UX to smart contracts and backend services. Previously worked with enterprise and startup teams to deliver secure, scalable blockchain products used by real users. Available for short-term builds, integrations, and targeted Web3 development work.

Katie Kirby

Blockchain Developer, AI Ethics Consultant, AI Engineer, +3





Senior Web3 full-stack engineer with 7+ years of production experience building blockchain-powered applications, dashboards, and integrations across Ethereum and Solana. I specialize in shipping user-facing dApps, wallet integrations, NFT platforms, and custom Web3 tooling — from frontend UX to smart contracts and backend services. Previously worked with enterprise and startup teams to deliver secure, scalable blockchain products used by real users. Available for short-term builds, integrations, and targeted Web3 development work.…Senior Web3 full-stack engineer with 7+ years of production experience building blockchain-powered applications, dashboards, and integrations across Ethereum and Solana. I specialize in shipping user-facing dApps, wallet integrations, NFT platforms, and custom Web3 tooling — from frontend UX to smart contracts and backend services. Previously worked with enterprise and startup teams to deliver secure, scalable blockchain products used by real users. Available for short-term builds, integrations, and targeted Web3 development work.

Available to hire

Senior Web3 full-stack engineer with 7+ years of production experience building blockchain-powered applications, dashboards, and integrations across Ethereum and Solana. I specialize in shipping user-facing dApps, wallet integrations, NFT platforms, and custom Web3 tooling — from frontend UX to smart contracts and backend services.

Previously worked with enterprise and startup teams to deliver secure, scalable blockchain products used by real users. Available for short-term builds, integrations, and targeted Web3 development work.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Work Experience

Blockchain Security & Backend Engineer (Consultant) at American Express

February 27, 2024 - Present

Designed and operated production blockchain transaction systems supporting high-volume asset issuance, with emphasis on transaction correctness, confirmation reliability, and post-execution verification. Built and maintained event-driven pipelines (webhooks, queues) to track transaction state changes and ensure accurate lifecycle handling across asynchronous systems. Integrated Fireblocks MPC custody and transaction authorization policies, collaborating on secure transaction submission and monitoring. Implemented batching and queueing strategies to optimize throughput, latency, and cost efficiency under load. Supported system reliability through upgrades by validating state assumptions, enforcing invariant checks, and improving observability around execution outcomes. Contributed to early initiatives addressing observability gaps and emerging agentic AI risks, focusing on traceability and verifiable execution paths.

Web3 NFT Platform & Wallet Integration at Copicat

January 31, 2025 - Present

Built a full-stack Web3 application with wallet authentication, NFT minting, and dashboard views using React, Solidity, and Ethereum/Solana integrations. Focused on clean UX and secure transaction handling.

Custom Smart Contract Development at Copicat

June 15, 2025 - Present

Designed and deployed smart contracts for NFT issuance and asset tracking, with frontend integrations for user interaction and admin tooling.