Alexey Koren
Cryptography Engineer at Excursia
Amsterdam, North Holland, Netherlands
Summary
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SeniorAlexey Koren is a cryptography engineer with a decade of experience focused on distributed ledger technologies, R&D and startup delivery, based in Amsterdam. He designs and implements privacy-preserving protocols—most recently contributing ZIP-226/227 for Zcash Shielded Assets at QEDIT—and previously led Corda privacy work at ING using Rust ZKP tooling (Zinc) and SGX proofs of concept. Comfortable bridging product, protocol and implementation, he maintains a Zinc fork, authors ZKP-friendly libraries (ZKKrypto) and has built compiler tooling to target ZKP VMs from Kotlin. As founder and technical lead of a location-based mobile audioguide startup, he still ships Android and backend code, keeping a pragmatic operator’s perspective. He blends deep cryptographic engineering with hands-on product development, and is equally at home debugging core protocol invariants or negotiating B2B customer requirements. An unusual strength is translating JVM/Kotlin ecosystems into ZKP-first toolchains, enabling practical privacy upgrades for enterprise DLTs.
10 years of coding experience
Github Skills (32)
kotlin10
blockchain-network10
corda10
zcash9
blockchain9
distributed-ledger9
dlt9
zebra9
smart-contracts9
proofs8
testing7
fabric7
cryptography7
deprecated7
cryptocurrency6
Programming languages (8)
Github contributions (5)
QED-it/librustzcash
Dec 2022 - Jan 2026
QEDIT main branch: https://github.com/QED-it/librustzcash/tree/zsa1
Contributions:183 reviews, 43 PRs, 193 pushes in 3 years 1 month
qed
QED-it/sapling-crypto
May 2024 - Aug 2025
Zcash "Sapling" cryptography
Contributions:5 reviews, 3 PRs, 7 pushes in 1 year 3 months
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