Kristian Sosnin
Cryptography Engineer at Nexus Labs
Dubai, Dubai, United Arab Emirates
Summary
🤩
Rockstar🎓
Top SchoolKristian Sosnin is a cryptography engineer based in Dubai with seven years of hands-on experience building high-performance back-end systems and blockchain tooling. He has strong Rust expertise from roles at Parity Technologies and Matter Labs, contributing to Polkadot, zkSync, and Wasmtime integrations that improved runtime APIs and compilation performance. Kristian contributed to database internals at Tarantool and to sqlx, fixing edge cases and memory issues in numeric conversions—demonstrating attention to low-level correctness and interoperability. Currently at Nexus Labs, he focuses on applied cryptography and secure system design while remaining selective about new opportunities. His profile shows a pattern of improving core infrastructure—compilers, DB engines, and blockchain nodes—rather than surface features. An unusual detail: he blends formal mathematical training from Lomonosov Moscow State University with practical fixes like recursion limits and BigDecimal handling that prevent subtle production failures.
7 years of coding experience
4 years of employment as a software developer
Specialist, Faculty of Mechanics and Mathematics, Specialist, Faculty of Mechanics and Mathematics at Московский Государственный Университет им. М.В. Ломоносова (МГУ)
Github Skills (32)
substrate10
postgresql10
back-end-development10
testing10
bigdecimal10
databases10
c1110
c1710
lua10
polkadot-js10
sql10
blockchain10
nodejs10
wasmtime10
rust10
Programming languages (9)
Github contributions (5)
matter-labs/zksync
Oct 2020 - Nov 2021
zkSync: trustless scaling and privacy engine for Ethereum
Role in this project:
Back-end Developer
Back-end DeveloperContributions:315 commits in 1 year 1 month
Contributions summary:Kristian primarily focused on developing and testing the Block structure within the zkSync project. Their contributions involved adding tests for the `Block` structure, including the handling of block sizes and the verification of big-endian byte order. Additionally, the user made changes to the types library by refactoring the existing code, particularly related to legacy formats of the eth messages, and adding support for the new transaction messages. The changes involved code modifications across multiple source files, showcasing a strong understanding of the project's core components.
privacyethereumteam-coretrustlessscaling
paritytech/polkadot
Aug 2021 - Jan 2023
Polkadot Node Implementation
Role in this project:Back-end Developer
Back-end DeveloperContributions:309 reviews, 150 commits, 67 PRs in 1 year 5 months
Contributions summary:Kristian primarily contributed to the Polkadot node implementation, specifically focusing on runtime API enhancements and low-level system configurations. Their work involved introducing new runtime API endpoints for fetching validation data and modifying Wasmtime configurations within the node's core functionality. They also addressed and fixed issues related to the PVF host, including artifact management and prechecking implementation.
substraterustblockchainparitypolkadot
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