Radek is available for hire

Radek Ostrowski

Verified Expert in Engineering

Ethereum Developer

Location

Phuket, Thailand

Toptal Member Since

September 24, 2014

Radek是Toptal区块链认证工程师，对以太坊和智能合约特别感兴趣. 在法币领域，他在大数据和机器学习项目方面经验丰富. 他是两次不同的国际IBM Apache Spark竞赛的三连冠得主, co-creator of PlayStation 4's back end, a successful hackathon competitor, and a speaker at conferences in Australia, Poland, and Serbia.

Java Web3.js Blockchain Ethereum Scala NoSQL Spring Hadoop Solidity Docker Apache Spark Cassandra Spark SQL Amazon Web Services (AWS)Python

Portfolio

StartOnChain

Smart Contracts, Ethereum, Blockchain

British Asset – Kauri Crypto (via Toptal)

JavaScript, GRAPH, Truffle, Solidity，以太坊

Zipmex Exchange (via Toptal)

Truffle, Solidity, Ethereum

Experience

Java - 11 years Ethereum - 4 years Blockchain - 4 years Web3.js - 4 years Scala - 4 years Solidity - 3 years Ethereum Smart Contracts - 3 years Apache Spark - 3 years

Availability

Part-time

Preferred Environment

GitHub, MacOS, Unix

The most amazing...

...我的成就是赢得了IBM举办的两次国际Apache Spark竞赛.

Work Experience

Blockchain Consultant

2018 - PRESENT

StartOnChain

与想要进入区块链领域的客户合作，特别是在以太坊生态系统中.
在ConsenSys的“Time Locked Wallet”演示项目中获奖, a uPort Blockchain and Identity hackathon.
为代币和ico设计和部署智能合约，包括代币归属, refund vaults, and multi-signature wallets.
Performed smart contract security audits.

技术:智能合约、以太坊、区块链

Ethereum Engineer

2020 - 2020

British Asset – Kauri Crypto (via Toptal)

为平台令牌创建并部署了一个抵押合约.
为权益合约创建了一个演示DApp.
实现并部署了用于跟踪所有事件并允许更高级查询的抵押合约图.

技术:JavaScript, GRAPH, Truffle, Solidity，以太坊

Ethereum Engineer

2019 - 2020

Zipmex Exchange (via Toptal)

使用调用委托代理创建了一个可升级的erc20令牌合约.
Deployed the project to mainnet, verified on Etherscan, 并指导团队如何使用它.

Technologies: Truffle, Solidity, Ethereum

Blockchain Engineer

2019 - 2019

LLPS, LLC (via Toptal)

搭建了一个房地产支持贷款平台的原型.
设计并构建以太坊智能合约，形成平台的后端.
使用React和Drizzle创建了区块链后端的用户界面.

技术:Drizzle, React, DApps, Web 3.0, Solidity, Ethereum

Blockchain Engineer

2018 - 2018

Grayblock (via Toptal)

帮助设计和构建POC平台，利用区块链改善发电融资.

Technologies: DApps, Web 3.0, Solidity, Ethereum

Blockchain Engineer

2018 - 2018

IDEX – Aurora Labs S. A. (via Toptal)

研究了IDEX对以太坊交易吞吐量和gas成本的各种优化, currently the biggest on-chain exchange.
原型化了几个优化，包括调度和专门的智能合约.

Technologies: Node.js, Solidity, Ethereum

Solidity Expert

2018 - 2018

Coinuma SL (via Toptal)

帮助将以太坊整合到正在构建的加密货币交易所中.
演示了钱包生成、以太币和令牌传输、余额检查和侦听事件.
Advised on best security practices.

Technologies: Python, Web 3.0, Solidity, Ethereum

Blockchain Engineer

2018 - 2018

Fan Hero (via Toptal)

Provided consultancy on Ethereum.
研究了许可块和IPFS的使用.
调查不使用以太币的代币转移.
Prototyped a token contract.

Technologies: IPFS, Solidity, Ethereum

Ethereum/Solidity Developer

2018 - 2018

Kryptonex LLC (via Toptal)

帮助将以太坊和ER20代币整合到目前正在构建的交易所中. It included address generation, token listing, 以及使用Web3进行以太币和代币相关的基本钱包操作.js.

Technologies: Web3.js, Ethereum, Solidity

Big Data Engineer

2017 - 2018

Commonwealth Bank of Australia

提供大数据技术和数据科学方面的咨询.
架构和设计可扩展的解决方案.
主要使用Apache Spark和Scala开发解决方案.
利用机器学习技术实现利润最大化.
带领团队在一次内部黑客马拉松中获胜——开发了一个用于知识发现的Slack机器人, deployed on AWS.

技术:机器学习，Scala, Apache Spark

Big Data Engineer

2016 - 2016

Taulia, Inc. (via Toptal)

设计并构建了新一代Taulia的数据分析平台.
有效地处理财务数据，提取有用的信息，批处理和实时.
Built the platform in Scala, Spark Streaming and SQL, Cassandra, Kafka, Docker, and Redshift, running on Kubernetes on AWS.

Technologies: Amazon Web Services (AWS), Redshift, Kubernetes, Docker, Cassandra, Apache Kafka, Scala, Spark

Big Data Engineer

2015 - 2016

Method Mill

帮助大规模集成各种数据源.
建立了从MySQL到Amazon Redshift的管道.
Created a syncing tool for Amazon S3.

Technologies: Amazon Web Services (AWS), MySQL, Amazon S3 (AWS S3), Redis, Redshift, Docker, Akka, Scala, Spark

Big Data Engineer

2015 - 2015

Max2, Inc. (via Toptal)

帮助设计和建立一个社区驱动的场地发现平台，提供个性化推荐, planning with friends, and curated and real-time information.
使用SparkSQL和DataFrames进行数据摄取，使用Spark Streaming和MLlib进行分析.
用Scala编写，使用Akka和Kafka，在Mesos上运行.

技术:Mesos, Akka, Apache Kafka, Scala, Spark

Senior Developer/Docker Evangelist

2015 - 2015

Tesco Bank

向开发环境介绍Docker.
Helped improve the CI pipeline.
Extended the credit card portal.
改进了贷款门户的用户旅程体验.

技术:Docker, Git, Cucumber, Spring, Java

Big Data Engineer

2015 - 2015

Expedia, Inc.

帮助自动化构建和运行过程.
Prototyped with Apache Spark.
更新现有Hive和MapReduce工作流.

技术:Jenkins, Azkaban, Chef, Git, Apache Spark, Hadoop

Senior Software Developer/Team Leader

2013 - 2015

Sony

为索尼设备和平台(主要是索尼PS4和4K-TV)构建了一个生产RESTful Java web服务，处理数十万个事务.
基于Spring框架和Cassandra开发.
提供基于OAuth2的身份验证和授权功能.
通过使用100%代码覆盖率的单元测试来关注代码的质量, BDD with Cucumber, code reviews with GitHub pull requests, and Jenkins.
制作了一个项目，收集、分析和可视化索尼设备的统计数据. 数据存储在Amazon S3中，使用Hadoop (MapReduce和Hive)进行处理。. 数据收集服务器和BI门户是基于Java的(Spring MVC和REST). 我保护了对web服务(通过扩展Spring Security)和关系数据库的访问. 使用的其他技术包括Apache Karaf (OSGi)和Maven.
参与Playstation及其他设备“One Account - All Sony”全球统一账户整合项目.
在布鲁塞尔领导一个三人团队，并与圣地亚哥团队的其他成员密切合作.

Technologies: Splunk, GitHub, Jenkins, Amazon S3 (AWS S3), Amazon EC2, Apache Hive, Hadoop, OAuth 2, Cucumber, REST, Spring, Scala, Java

Senior Developer

2012 - 2012

DeltaDNA (GamesAnalytics)

应对实时数据收集的挑战, predictive analytics, data measurement, 以及数百万在线和移动电脑游戏的用户粘性, 通过优化游戏设计和有针对性的游戏内部信息，个性化用户游戏体验，提高留存率和收益.
Designed, developed, 并作为敏捷内部开发团队的一部分，为平台和移动sdk提供新功能的持续更新和增强.

Technologies: Amazon Web Services (AWS), iOS, Android, Apache Hive, Hadoop, VoltDB, REST, Spring, Java

Applications Consultant

2006 - 2012

EPCC (University of Edinburgh)

Led “Work Package 3: Test, Delivery, 和支持”从开始到结束在一个优秀的评级, data-intensive research project for the EU.
Designed and implemented the test platform, new software components based on Java, REST, Spring, Hibernate, 和HDFS，并在项目生命周期内扩展现有的软件组件，如OGSA-DAI.
在高性能计算领域获得科学硕士学位, “test infecting” the students by lecturing and leading tutorials on unit testing and extreme programming and Agile methods; also created and gave a lecture on cloud use cases.
为OGSA-DAI软件开发了基于Jersey的RESTful表示层.
为英国国家超级计算服务设计并开发了一个iPhone应用程序.
Fixed performance problems involving CUDA, C, JNI, 和Java代码，并通过一家衍生公司改进了其图形用户界面.
参与研究使用Hadoop/MapReduce和云(Amazon EC2/Eucalyptus)分析后基因组数据的项目.
通过在Java中实现web服务层，实现了UKQCD社区与国际点阵数据网格的集成.

技术:Amazon Web Services (AWS)、Hadoop、Spring、REST、Java

Experience

Topcoder/ConsenSys - uPort区块链和身份黑客马拉松

http://github.com/radek1st/uport-time-locked-wallets

设计并实现以太坊dApp，在黑客马拉松中获奖. 它由智能合约和web前端组成, 并可用于时间锁定以太坊和ERC20令牌. dApp可用于加密礼物和授予.

我的完美天气- IBM火花竞赛

我设计并构建了这个web服务，它获得了IBM Sparkathon大赛的大奖和粉丝最爱奖.

浸入大数据河:大规模流分析

http://github.com/radek1st/BigDataRiver

我在澳大利亚最大的数据会议上展示了我的项目. Recorded talk is available here:
http://data.yowconference.com.au/profile/?id=radek-ostrowski

Kaggle - Data Science Competitions

http://www.kaggle.com/radek1st

我的排名展示了我与世界上最好的数据科学家竞争的能力:
* Expedia酒店推荐排名前6% (100/1984)
在Outbrain点击预测中排名前9% (84/979)

iWisps - IBM Spark Competition

一个快速、可扩展、可移植的本地商业推荐微服务，由Apache Spark提供支持. 我设计并建造的项目成为IBM Spark竞赛的获胜者，并在纽约的IBM活动中获得了“大支票”.

Scala for Data Science

I was a technical reviewer for the book.

Contributions to Spark Notebook

http://github.com/andypetrella/spark-notebook/pull/191

使用Spark SQL、Spark Streaming和MLlib在Spark中创建了一个异常检测演示.

Contributions to Stubby4j

http://github.com/azagniotov/stubby4j/pull/50

增加了基于请求中指定的RegEx表达式从文件系统路径提供文件的功能.

对Spring安全认证的贡献

http://github.com/spring-projects/spring-security-oauth/commits?author=radek1st

扩展表达式方法，允许通过指定RegEx表达式对现有范围进行测试.

Publication

Skills

Languages

Solidity, Scala, Java, Python, JavaScript

Frameworks

Truffle, Apache Spark, Play Framework, Spring, Hadoop, OAuth 2, Spark, Akka

Libraries/APIs

Web3.js, Spark Streaming, Node.js, React, Drizzle

Tools

Git, Spark SQL, Cucumber, Jenkins, GitHub, Splunk, Chef, Mesos

Paradigms

数据科学，敏捷软件开发，函数式编程，Scrum，看板，REST

Platforms

Android, Drupal, Blockchain, Ethereum, Docker, Linux, MacOS, Kubernetes, Hyperledger, R3 Corda, Apache Kafka, Amazon Web Services (AWS), Amazon EC2, iOS, Unix

Storage

NoSQL, Cassandra, Redshift, Apache Hive, Amazon S3 (AWS S3)， voldb, Azkaban, Redis, MySQL

Other

Ethereum Smart Contracts, Machine Learning, Data Engineering, Freelancing, Altcoin, Smart Contracts, Non-fungible Tokens (NFT), IPFS, Web 3.0, DApps, GRAPH

Education

2005 - 2006

高性能计算(优异)理学硕士学位

University of Edinburgh - Edinburgh, UK

2004 - 2005

计算机科学(荣誉)学士学位

爱丁堡纳皮尔大学-英国爱丁堡

2001 - 2004

物理与信息技术学士学位

尼古拉斯·哥白尼大学-托伦，波兰

Certifications

JUNE 2017 - PRESENT

Apache Cassandra架构师认证

DataStax

MAY 2015 - PRESENT

Developer Certification for Apache Spark

Databricks

JANUARY 2014 - PRESENT

Java Web Services Certified Expert

Oracle

Collaboration That Works

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Radek Ostrowski

Verified Expert in Engineering

Ethereum Developer

Portfolio

Experience

Availability

Preferred Environment

The most amazing...

Work Experience

Blockchain Consultant

StartOnChain

Ethereum Engineer

British Asset – Kauri Crypto (via Toptal)

Ethereum Engineer

Zipmex Exchange (via Toptal)

Blockchain Engineer

LLPS, LLC (via Toptal)

Blockchain Engineer

Grayblock (via Toptal)

Blockchain Engineer

IDEX – Aurora Labs S. A. (via Toptal)

Solidity Expert

Coinuma SL (via Toptal)

Blockchain Engineer

Fan Hero (via Toptal)

Ethereum/Solidity Developer

Kryptonex LLC (via Toptal)

Big Data Engineer

Commonwealth Bank of Australia

Big Data Engineer

Taulia, Inc. (via Toptal)

Big Data Engineer

Method Mill

Big Data Engineer

Max2, Inc. (via Toptal)

Senior Developer/Docker Evangelist

Tesco Bank

Big Data Engineer

Expedia, Inc.

Senior Software Developer/Team Leader

Sony

Senior Developer

DeltaDNA (GamesAnalytics)

Applications Consultant

EPCC (University of Edinburgh)

Experience

Topcoder/ConsenSys - uPort区块链和身份黑客马拉松

我的完美天气- IBM火花竞赛

浸入大数据河:大规模流分析

Kaggle - Data Science Competitions

iWisps - IBM Spark Competition

Scala for Data Science

Contributions to Spark Notebook

Contributions to Stubby4j

对Spring安全认证的贡献

Docker入门:简化DevOps

我是如何在黑客马拉松中使用Apache Spark和Docker来构建天气应用程序的

时间锁定钱包:以太坊智能合约简介

The Ultimate ENS and ĐApp Tutorial

Apache Spark的示例和用例介绍

Skills

Languages

Frameworks

Libraries/APIs

Tools

Paradigms

Platforms

Storage

Other

Education

高性能计算(优异)理学硕士学位

计算机科学(荣誉)学士学位

物理与信息技术学士学位

Certifications

Apache Cassandra架构师认证

Developer Certification for Apache Spark

Java Web Services Certified Expert

How to Work with Toptal

Share your needs

Choose your talent