Sebastian Kunert
Team Lead SDK-Node at Parity Technologies
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolSebastian Kunert is a Berlin-based software engineer and team lead with 12 years of experience building back-end systems and developer tooling, currently leading the SDK-Node team at Parity Technologies. He combines deep Rust expertise—contributing substantial runtime, benchmarking, and async runtime work to high-profile projects like Polkadot, Substrate and Cumulus—with earlier full-stack and data-engineering experience (notably improving CSV I/O in Apache Flink). Sebastian’s work spans performance measurement, API ergonomics, and codebase modernization (refactoring, clippy fixes, wasm build improvements), demonstrating a pragmatic focus on reliability and maintainability. He holds an M.Sc. in Computer Science from TU Berlin and brings a history of industry and research internships that shaped his systems-thinking approach. Colleagues describe him as a hands-on leader who moves between low-level runtime concerns and SDK design to make complex blockchain infrastructure more usable for integrators.
12 years of coding experience
6 years of employment as a software developer
Bachelor of Science (B.Sc.) Applied Computer Science, Bachelor of Science (B.Sc.) Applied Computer Science at Baden-Wuerttemberg Cooperative State University (DHBW)Master of Science (M.Sc.) Informatik, Master of Science (M.Sc.) Informatik at Technische Universität Berlin
German, English
Github Skills (29)
substrate10
benchmark10
apache-flink10
apidoc10
benchmarking10
java10
parity10
javas10
polkadot-js10
api10
blockchain10
cumulus10
nodejs10
rust10
para10
Programming languages (13)
Github contributions (5)
paritytech/polkadot-sdk
Aug 2023 - Apr 2025
The Parity Polkadot Blockchain SDK
Role in this project:
Back-end Developer
Back-end DeveloperContributions:615 reviews, 144 PRs, 212 pushes in 1 year 7 months
Contributions summary:Sebastian's contributions focus on implementing a benchmark to measure transaction throughput within the Parity Polkadot Blockchain SDK. Their work involved adding a new benchmark file, specifically for measuring transaction throughput, within the `cumulus/test/service/benches` directory. The code modifications include the import of necessary crates and the definition of the benchmarking function. The user interacts with the `cumulus_test_runtime`, indicating a focus on the backend functionality of the blockchain.
blockchaincumuluspolkadotsubstrate
paritytech/cumulus
Nov 2021 - Jan 2023
Write Parachains on Substrate
Role in this project:Backend Developer
Backend DeveloperContributions:305 reviews, 51 commits, 81 PRs in 1 year 2 months
Contributions summary:Sebastian contributed to the `cumulus` repository, which is focused on building parachains on Substrate. Their commits primarily involved porting and implementing benchmarks for the transaction pool, specifically measuring transaction throughput. This work involved creating and modifying Rust code within the testing service to assess performance metrics related to transaction handling within the parachain environment. The user's changes included modifications to benchmark files and integration with the test runtime.
substraterustblockchainparachainsparity
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