Built by Payments People Who Found Blockchain
KomiKey Technologies was founded in 2017 by James Hart and Sarah Chen, who met while working on payment infrastructure at Revolut. Frustrated by how difficult it was to integrate crypto payments reliably at scale, they left to build the tooling they wished had existed.
What started as a two-person consultancy in a Shoreditch co-working space has grown into a 38-person specialist firm serving clients across Europe, North America, and Southeast Asia. We have offices in London, Lisbon, and Singapore.
Our Mission
We believe crypto payments should be as reliable, fast, and invisible as card payments. Every business that wants to accept digital assets should be able to do so without hiring a team of blockchain engineers. We exist to close that gap.
Our Approach
We are engineers first. Every engagement starts with a deep technical audit of your existing payment stack. We do not sell you a product — we design a solution to your specific problem, build it, and hand it over with full documentation and a 12-month support SLA.
We work across the full stack: protocol layer, smart contracts, APIs, SDKs, and front-end wallet UIs. We understand compliance requirements in the UK, EU, US, and Singapore, and we build with those constraints in mind from the start.
Leadership Team
James Hart — Co-founder & CEO
James spent a decade in traditional payments at Barclays and Mastercard before joining Revolut as Head of Payment Infrastructure in 2015. He holds an MSc in Computer Science from UCL and is a regular speaker at Money20/20 and Consensus.
Sarah Chen — Co-founder & CTO
Sarah holds a PhD in Applied Cryptography from Imperial College London. Prior to KomiKey, she led the blockchain research division at JPMorgan Onyx, where she contributed to the development of JPM Coin. She is a co-author of three peer-reviewed papers on threshold signature schemes.
Alex Morozov — Head of Engineering
Alex has been writing Solidity since 2016. Before KomiKey, he was a senior engineer at Parity Technologies and a core contributor to the OpenZeppelin Contracts library. He has audited over 80 smart contract codebases and personally reported 12 critical vulnerabilities through responsible disclosure.
Locations
- London (HQ) — 14 Curtain Road, Shoreditch, EC2A 3AT
- Lisbon — Rua Augusta 90, 1100-053
- Singapore — 1 Raffles Place, #20-61 One Raffles Place