Work
Positions
- Principal Research Engineer at Greenfield Capital (2022 — now)
- Leading the infrastructure deal team and member of the IC
- Head of Engineering at Greenfield Capital (2020 — 2022)
- Technical due diligience, running validators & internal infrastructure
- Senior Software Engineer at Coinbase (2020 — 2020)
- On-chain intelligence
- Head of Engineering at TokenAnalyst (2018 — 2020)
- On-chain data provider for quantitative trading firms
- Co-Founder at Reebo (2018 — 2019)
- Smart Contract Security Monitoring
- Data Engineer at Hive Streaming (2017 — 2018)
- Batch Report Analytics for P2P CDN
- Data Engineer at Plista (2016 — 2017)
- NLP-based recommender systems
- PhD Researcher at University of Oldenburg (2014 — 2016)
- Numerical blackbox optimization under constraints
Investments
I led the following fund investments at the crypto investment firm Greenfield Capital.
- Arcium (2024)
- Parallelized Confidential Computing Network for Solana
- Stroom (2023)
- Liquid Staking Protocol for Lightning Network Channel Capacity
- Foundation Devices (2021)
- Self-Sovereignty Open Source Hardware Wallet
Open source
- Mocked Streams (2016 — 2022)
- Scala: DSL for Unit-Testing Kafka Streams Topologies
- Blockchain-Importer (2019 — 2020)
- Scala: Imports Ethereum on-chain data into Kafka ecosystem
- Blockchain-RPC (2020 — 2020)
- Scala: JSON-RPC client for Ethereum/Bitcoin nodes
- Chop Chop (2020 — 2020)
- Typescript/React: Mouseless paged-reader for the browser
- Kafcache (2019 — 2020)
- Low-latency Kafka Streams State Store Memcached
- Twitter Intervals (2017 — 2018)
- Scala: Intervals for Twitter Util
- Twitter Stream (2017 — 2018)
- Twitter Streaming API Example with Kafka Streams
- CG Price database
- Rust: Fun Project to learn Rust
Publications
- Multi-stage Constraint Surrogate Models for Evolution Strategies
- Jendrik Poloczek, Oliver Kramer:
- A Framework for Data Mining in Wind Power Time Series.
- Oliver Kramer, Fabian Gieseke, Justin Heinermann, Jendrik Poloczek, Nils André Treiber
- KNN Regression as Geo-Imputation Method for Spatio-Temporal Wind Data.
- Jendrik Poloczek, Nils André Treiber, Oliver Kramer
- Local SVM Constraint Surrogate Models for Self-adaptive Evolution Strategies
- Jendrik Poloczek, Oliver Kramer: