John is available for hire

John R. Kosinski

Verified Expert in Engineering

Full-stack Developer

Location

Chiang Mai, Thailand

Toptal Member Since

February 9, 2016

As a veteran full-stack developer, John在加密货币方面的经验非常广泛和深入, IoT, blockchain, and mobile projects. 他的基础是C和c++，有多年的经验 .NET. 直到2009年，他的工作经历都是在纽约和纽约地区. 自2009年以来，他一直在国外生活和远程工作. 约翰在后台有一个个人研究项目, involving blockchain and deep neural networks.

Portfolio

Leeds Rising

软件开发，API集成，交易，c#， Python，交易系统...

Patagon Management LLC

稳定性，区块链，智能合约，算法交易...

AxiomSys

稳固，区块链，智能合约，以太坊，以太坊智能合约...

Experience

Software Development - 20 years .NET - 16 years C++ - 16 years Design Patterns - 14 years Technical Leadership - 7 years Banking & Finance - 5 years TypeScript - 4 years Solidity - 4 years

Availability

Part-time

Preferred Environment

Ethers.js、Visual Studio、Visual Studio Code (VS Code)、Scrum、Agile、测试驱动开发(TDD)

The most amazing...

...我最近做的一件事是开发了一种区块链金融工具，这是同类工具中最早的一种.

Work Experience

Software Developer

2023 - 2023

Leeds Rising

Developed PyDAS: a robust, 完整且经过良好测试的Python API到DAS交易平台的购买API, selling, borrowing, and short-selling US stocks.
使用PyDAS API开发并严格测试了算法交易系统, which can specify dynamic trading strategies, 包括一个可配置的触发器和可配置的即插即用的交易逻辑.
实施在纳斯达克和纽约证券交易所借入和卖空非流动性股票的策略. 在现场市场上部署和测试这些策略.

Technologies: 软件开发，API集成，交易，c#， Python，交易系统, Stock Trading, Multithreading

DeFi Architect

2022 - 2023

Patagon Management LLC

Architected and developed a dApp, one of the first of its kind, 允许用户在区块链上购买美国国债基金. Launched on BSC and Ethereum blockchains. Won the race to market before competitors.
设计并开发了一个安全的链下系统，用于自动清理金库和其他与美国国债金库系统相关的流程.
进行技术研究，以评估区块链领域各种潜在自动化对冲基金策略的可行性.
对链上区块链产品实施严格的测试和安全.
为分散应用程序和管理分散接口指导测试和开发React前端.

Technologies: 稳定性，区块链，智能合约，算法交易, Algorithmic Trading Analysis, Hedge Funds, Web 3.0、应用架构、自动交易软件、后端、REST、Git、Express.js, Web Security, Penetration Testing, Decentralized Systems, Decentralized Finance (DeFi), ERC-20, Web3.js、技术架构、解决方案架构、 Fintech, Lambda Functions, Amazon Simple Notification Service (Amazon SNS)

Technical Consultant

2022 - 2023

AxiomSys

计划和估计不可替代和可替代代币开发的项目包, 使用React创建和管理前端网站, and security audits of smart contracts.
Researched, planned, 并介绍了一个知名在线会议场所的Unity游戏引擎后端的可替代和不可替代代币的集成.
Contacted, vetted, and interviewed blockchain developers, 为国际区块链精英团队奠定基础.
开发、计划和记录智能合约的安全审计方法.
在销售会议期间提供专家技术咨询.

Technologies: 稳固，区块链，智能合约，以太坊，以太坊智能合约, Solana, C#, JavaScript, .NET, Unity, Software Development, Blockchain & 加密货币，全栈，Rust，加密货币，Unix, c#.. NET、TypeScript、Crypto、Architecture、React、MetaMask、Rinkeby、Web.应用架构，自动交易软件，后端，Git, Express.js, R&D，分布式系统，ERC-20, Web3.. js，技术架构，解决方案架构，PostgreSQL, Go, Lambda函数

Senior C# Web3 Developer

2022 - 2022

Garbles Labs

Ported the TypeScript SDK to C#/.NET for the well-known Solana market maker Orca Whirlpools to be used in the Unity game engine; made it open for community use.
Developed the SDK for .NET，根据需要进行重构，并添加了一套自动化测试以确保质量.
与Rust智能合约接口，并根据需要修改Rust代码以实现可测试性.

Technologies: C#, Unity, C#.NET, TypeScript, Blockchain, Rust, Node.js, JavaScript, Smart Contracts, Gaming, .NET, Decentralized Systems, Web3, ASP.NET Core

Enterprise C++ Developer

2019 - 2022

Alteryx

解决了软件主要后端c++引擎中的客户和内部缺陷, 在Windows和Linux平台上使用c++ 11.
为软件的主要后端c++引擎开发新功能, 作为开发团队的一员，在Windows和Linux平台上使用c++ 11.
Fixed some of the most long-standing and challenging defects in the software; thoroughly documented the root causes and implemented testing to prevent a recurrence.
Managed the defect lifecycle, 在需要时与其他团队沟通信息并提供帮助.

Technologies: C#, .NET, Microsoft Visual Studio, C++11, C++, Test-driven Development (TDD), Defect Management, Microsoft SQL Server, Agile Software Development, Unit Testing, Software Development, Design Patterns, Complex Problem Solving, Linux, JavaScript, APIs, CI/CD Pipelines, SQL, Unix, Integration, C#.NET, Architecture, Algorithms, MySQL, Application Architecture, API Integration, Back-end, Git, Confluence, Visualization, Data Engineering, Technical Architecture, Solution Architecture, Multithreading

IoT Engineer

2018 - 2019

Jaber Medical

开发ESP8266和ESP32硬件原型，用于独特和专有的医院急诊室通信系统. 原型机包括红外、WiFi和射频识别芯片扫描仪.
为硬件样机设计并开发了ESP32/ESP8266的嵌入式网络软件, with Arduino and RTOS in C, interacting with WiFi, IR, and RFID readers.
研究并做出关于软件和硬件需求的决策和权衡, 与客户紧密合作以满足他们的需求.

Technologies: Amazon Web Services (AWS), ESP32, ESP8266, Embedded Systems, Amazon DynamoDB, Arduino, C++, Internet of Things (IoT), C, JavaScript, Agile Software Development, Node.js, Unit Testing, AWS IoT, Real-time Operating System (RTOS), MQTT, Software Development, Design Patterns, Embedded C++, Complex Problem Solving, Microservices, Linux, APIs, Full-stack, TypeScript, Architecture, Amazon EC2, AWS Lambda, Application Architecture, NoSQL, REST, Git, Express.js、技术架构、解决方案架构、 Lambda Functions, Amazon Simple Notification Service (Amazon SNS)

Alexa Developer

2018 - 2018

Anguleris Technologies

开发了一个丰富的Alexa应用程序，允许客户对复杂的产品数据库进行英语口语查询.
在AWS、Node上使用DynamoDB架构和开发后端.js和AWS SDK，以自动从提供商导入后端数据并与数据库同步.
开发了严格的自动化测试套件，以确保持续的质量.

Technologies: Amazon Web Services (AWS), Amazon Alexa, JavaScript, Agile Software Development, Unit Testing, AWS IoT, Software Development, Design Patterns, Complex Problem Solving, Amazon EC2, AWS Lambda, Amazon DynamoDB, Application Architecture, NoSQL, Git, Lambda Functions

Alexa Developer

2017 - 2018

Sterling VC

开发并推向市场的Alexa技能检索纽约体育新闻更新的Alexa Echo, Dot, and Show.
Used DynamoDB, AWS Lambda scripts in Node.js, 和AWS SDK来构建一个后端系统，用于从提供商那里检索数据并保持数据库同步.
为Alexa设计并实现了声控UI，以及Alexa Show的可视化UI.

Technologies: Amazon Web Services (AWS), Node.js, Amazon Alexa, Agile Software Development, Unit Testing, AWS IoT, Software Development, Design Patterns, Complex Problem Solving, JavaScript, Full-stack, Amazon EC2, AWS Lambda, Amazon DynamoDB, Application Architecture, Git, Lambda Functions

R&D Manager

2017 - 2018

Futronix

在亚马逊Echo Dot的Alexa技能开发以及如何将其整合到现有欧博体育app下载中进行研究和指导.
研究了在公司现有产品中使用更便宜的ESP8266和ESP32芯片取代专有芯片的可能性.
创建了一个原型模块，用于将语音命令集成到现有家居照明产品的接口中, utilizing AWS and Alexa APIs.
Presented and documented research findings, 以及技术产品改进的新建议.

Technologies: Amazon Web Services (AWS), Amazon Alexa, Arduino, Embedded C++, ESP8266, Internet of Things (IoT), JavaScript, .NET, Agile Software Development, Node.js, Unit Testing, AWS IoT, Real-time Operating System (RTOS), Embedded Systems, MQTT, ESP32, Software Development, Design Patterns, .NET Core, Complex Problem Solving, Linux, C#, Unix, Architecture, Amazon EC2, AWS Lambda, Amazon DynamoDB, Application Architecture, GraphQL, Git, Prediction Markets, Visualization, ASP.NET Core, Technical Architecture, Solution Architecture, PostgreSQL, Lambda Functions, Amazon Simple Queue Service (SQS)

Automated Trade Analyst

2016 - 2017

Event Driven Investor

不同金融资产价格序列相关性分析的改进算法.
修正Pearson系数计算，发现股票交易对之间的相关性.
重构c#应用程序代码，以获得更好的组织、可扩展性和模块化.
添加了自动测试以发现现有代码库中的错误. Analyzed and fixed the bugs found.

Technologies: C#, SQL, .NET, Interactive Brokers API, Infragistics, Azure, MySQL, Stock Trading, Trading, Finance, Stock Analysis, Trading Systems, ASP.NET Core, Fintech, Multithreading

Node.js Developer

2016 - 2017

Private Client

开发了一个完整且有利可图的算法交易系统，以利用加密货币期货和现货市场之间的套利机会.
测试和调试系统，使用各种交易所的api.
开发插件，允许系统在各种流行的加密期货和现货交易所使用.

技术:区块链、交易、套利、期货、JavaScript、敏捷软件开发、节点.js、单元测试、软件开发、设计模式、复杂问题解决、Docker、Linux、c#、 .NET, Microsoft Visual Studio, Ethereum Smart Contracts, Decentralized Finance (DeFi), APIs, Blockchain & Cryptocurrency, Full-stack, Bots, Binance API, Cryptocurrency, Unix, Integration, TypeScript, Crypto, Architecture, Rinkeby, Amazon EC2, Amazon RDS, AWS Lambda, Amazon DynamoDB, Algorithmic Trading, Algorithmic Trading Analysis, Application Architecture, Automated Trading Software, REST, Git, Express.js, Prediction Markets, Visualization, Twilio, Trading Systems, Decentralized Systems, Bitcoin, Technical Architecture, Solution Architecture, Multithreading, Lambda Functions, Amazon Simple Notification Service (Amazon SNS)

Freelance Senior Xamarin Developer

2015 - 2017

Aquamonix

从头开始开发一个Xamarin iOS应用程序，通过Java中间层控制大规模SCADA灌溉系统.
构建MVP的架构，并准备一个促进跨平台移植的计划.
创建了一个紧密的系统，跨多个连接或应用程序会话与服务器端同步长时间运行的任务.

Technologies: WebSockets, C#, JavaScript, .. NET, Microsoft Visual Studio，敏捷软件开发，Node.. js、单元测试、软件开发、设计模式、Xamarin.iOS，复杂问题解决，全栈，SQL, c#.. NET、REST api、应用架构、后端、REST、Git、移动应用、Xamarin.Android, Solution Architecture

Mobile Developer (Remote)

2014 - 2016

Door3/FreshDirect

使用Xamarin开发了一个赢得网络大奖的电子商务iPad应用程序.iOS取代了公司的遗留Objective-C应用程序，并将Android和iOS遗留应用程序统一到一个代码库中.
与小团队一起使用Xamarin iOS开发后端和前端功能.
帮助构建框架，将两个遗留应用程序的代码库合并为一个统一的Xamarin应用程序.
诊断和修复公司遗留的Android和iOS应用程序的缺陷.

Technologies: Java, Scrum, Jira, Android, iOS, Xamarin, C#, JavaScript, Agile Software Development, Node.js, Unit Testing, eCommerce, Software Development, Model View Controller (MVC), Design Patterns, Model View ViewModel (MVVM), Xamarin.iOS, Complex Problem Solving, .NET, APIs, Full-stack, SQL, Integration, C#.NET, Architecture, REST APIs, Application Architecture, API Integration, Back-end, Git, Mobile Apps, Xamarin.Android, ASP.. NET核心，技术架构，解决方案架构，企业架构

Senior Developer | Team Leader

2012 - 2014

Manao Software

管理一个开发团队，为EveryAngle提供一个独特的sap查询接口的REST/JSON前端.
对上述软件进行了体系结构设计 .NET Web API MVVM with NHibernate.
Managed a team to develop the above software in .NET.
Directed the QA unit testing using SoapUI; interfaced with the client's executive team.

Technologies: RESTful Services, Domain-driven Design (DDD), Perforce, Jira, Scrum, Test-driven Development (TDD), User Interface (UI), SOAP, Knockout (Knockout.. js)、Model View ViewModel (MVVM)、JSON、c#、Microsoft Visual Studio、Agile Software Development、ASP.NET, Unit Testing, WebSockets, Software Development, Model View Controller (MVC), Design Patterns, Xamarin.iOS、领导力、技术领导力、团队领导力、精益项目管理、 .. NET Core，复杂问题解决，微服务，c++， Linux， .NET, APIs, HTML, Unix, C#.NET, Architecture, Windows, ASP.NET MVC, REST APIs, Amazon RDS, Application Architecture, API Integration, Azure, Back-end, REST, Git, Express.js, Mobile Apps, ASP.. NET核心，技术架构，解决方案架构，多线程， .NET 4, Enterprise Architecture

Software Development Manager

2009 - 2012

HotelTravel.com

Architected, oversaw, 并为底层后端预订引擎的全面检修编写了代码(对于某些部分), 一个复杂的系统，用于整合来自不同类别酒店价格提供商的数据.
为新软件组件的自动和手动测试设计并实现测试驱动策略，以确保每个组件的开发质量及其在整个系统中实现的正确性.
指导个别开发人员进行软件微设计(例如.g., design patterns), new technologies (such as mobile), and best practices for efficiency, security, and scalability.

技术:Internet服务器应用程序编程接口(ISAPI), Android, PHP, Microsoft SQL Server, C++, C#, Microsoft Visual Studio, Agile Software Development, ASP.NET, Unit Testing, WebSockets, Software Development, Design Patterns, Leadership, Technical Leadership, Team Leadership, Lean Project Management, Complex Problem Solving, Linux, .NET, HTML, SQL, C#.. NET，架构，Windows应用程序开发，Windows, ASP.NET MVC, REST APIs, IIS, Legacy Software, Application Architecture, Windows Services, API Integration, Azure, Back-end, REST, Object-relational Mapping (ORM), Express.js、技术架构、解决方案架构、 .NET 4, Crystal Reports, WinDev

Senior Developer

2007 - 2009

Morgan Stanley (NYC)

为摩根士丹利全球财富管理平台的新固定收益产品界面开发后端逻辑.
Designed and integrated .. NET模块与用COBOL编写的遗留大型机系统接口.
在部门内率先推行测试驱动的开发政策, 为各种项目实现严格的自动化测试.

技术:SOAP, JavaScript, Microsoft Visual Studio, ASP.NET, Unit Testing, Banking & 金融、WebSockets、软件开发、设计模式、微服务、c++、 .NET, SQL, COM, C#, C#.. NET，架构，Windows应用程序开发，Windows, ASP.NET MVC, REST APIs, IIS, Legacy Software, Windows Services, API Integration, Back-end, REST, Object-relational Mapping (ORM), Fintech, Multithreading, Enterprise Architecture, Crystal Reports

Experience

Bond Vault for EVM Blockchains

http://streamprotocol.money

这是一个安全的合约系统，是首个此类系统之一，它为美国国债和其他固定收益工具创建了一个链上ETF. 它目前在币安智能链(BSC)和以太坊上推出. The on-chain side is written in Solidity, 链下处理主要是在AWS上使用TypeScript, and the front end is created with vanilla React.

PROJECT LINKS:
• streamprotocol.money
• appstreamprotocol.money/
• etherscan.io /地址/ 0 xd86ffb404147163e19e010a0e9d4995e0e36f335
• etherscan.io /地址/ 0 xadf789e61bf38c463e4ba5b2b6e9c1af6659e11b
http://etherscan.io /地址/ 0 xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
• etherscan.io /地址/ 0 x746430119da3ea0e398b93059e96f21bfabaa8a4
http://etherscan.io /地址/ 0 xd48425b7fb702f571d872f4b7046b30c9fa47e15
• bscscan.com/address/0x3daa26E70383B37E41434a8bF8e8bF3A335c144A
http://bscscan.com/address/0xB95Bc0d1057a43ACF608805c6D4e3e234e4d4C1b
• bscscan.com/address/0x8ac76a51cc950d9822d68b83fe1ad97b32cd580d
http://bscscan.com/address/0x2A7aD6908A08dD19D6c5090aA86E7c7E61C3e7F4
• bscscan.com/address/0x2900E387152a22370F482a0640701e1B41cc0896
• github.com/jrkosinski/evm-bond-vault

Zeppelin: EthGlobal 2023 Hackathon Winner

http://ethglobal.com/showcase/zeppelinfinance-gvawn

我设计和建造的区块链项目连接了去中心化金融和电子商务, 为电子商务卖家提供了一个门户，通过销售定制的nft为他们的项目融资.
使用Solidity, Hardhat, TypeScript, Tableland和Next创建.js.

Common NFT Contract Design Anti-patterns

http://medium.com/@john.kosinski/4-common-nft-contract-design-anti-patterns-dd519c02a7af

撰写并发表了一篇关于最常见的设计反模式的文章.

扫描区块链中经过验证的nft，我经常看到重复出现的常见反模式. 我写了一篇文章，列出了我认为最常见的几种, some thoughts about why they occur, and some better alternatives.

Security Manager Design Pattern in Solidity

http://medium.com/@john.kosinski/security-manager-design-pattern-in-solidity-d8851779cb6d

这是我在完成一个定义项目后写的一篇文章，该项目是关于在Solidity中保护一组智能合约的特定设计模式的. 这是一个简单的模式，可以作为个人对solid中模块化设计概念的有用介绍，以及它与传统OOP的不同之处.

Ethernaut Solutions

http://github.com/jrkosinski/Ethernaut

这些都是众所周知的以太问题的解决方案. 由OpenZeppelin发布的练习作为教学工具，并评估一个人理解EVM和Solidity安全漏洞以及如何防范它们的能力. 这些解决方案包含带有单元测试和解释的完整源代码.

Krew NFT Project

http://github.com/jrkosinski/krewnime-nft

开发和部署安全且经过良好测试的NFT智能合约和web3脚本，以管理以太坊和Polygon等EVM链的合约，并使用Metaplex管理Solana. Listed on Opensea and Magic Eden.

FreshDirect iOS

一个屡获殊荣的iOS杂货订单/配送应用程序，为著名的纽约在线杂货店, FreshDirect. It was developed with .NET using the Xamarin iOS platform. 这款应用在2015年网站和移动网站类别中获得了Webby奖.

Aquamonix iOS

http://apps.apple.com/nz/app/aquamonix/id1166491146

这是一款iOS应用程序，允许Aquamonix的客户远程与他们的工业规模的SCADA灌溉系统进行交互. It was developed from scratch using Xamarin iOS.

IoT Demo for Alexa

http://github.com/jrkosinski/AlexaTvRemote

这个Alexa的物联网演示允许用户使用Echo设备和嵌入ESP8266芯片的代码来控制三星电视遥控器关闭和打开电视.

它与Toptal上的Toptal博客文章相关联.com/arduino/esp8266-arduino-tutorial-alexa-hack

Medium Articles

http://medium.com/@john.kosinski

这些是我最近在Medium上发表的文章，展示了我的技能和知识
• blockchain development and architecture
• machine learning and AI
• statistics
• software development and architecture
• communication skills

为Keras LSTM输入准备和整形时间序列数据

http://medium.com/@john.kosinski/preparing-and-shaping-timeseries-data-for-keras-lstm-input-part-one-5bb882bc2143

这篇由两部分组成的文章详细介绍并演示了一些预处理时间序列数据(使用的示例是股票价格历史数据)的技术，准备将其用作Keras长短期记忆(LSTM)神经网络的输入.

所描述和演示的预处理包括缩放等统计转换, handling outliers, removing the trend, and extracting important features. 它还包括将数据塑造成适当数量的维度的正确方法.

The article is in two parts:
Part 1: http://medium.com/@john.kosinski/preparing-and-shaping-timeseries-data-for-keras-lstm-input-part-one-5bb882bc2143
Part 2: http://medium.com/@john.辛斯/ preparing-and-shaping-timeseries-data-for-keras-lstm-input-part-two-ad17f6ab450

Publication

Education

1993 - 1998

Bachelor of Science in Computer Science

University of Delaware - Newark, DE, USA

Certifications

OCTOBER 2023 - PRESENT

AWS Certified Solutions Architect – Associate

Amazon Web Services

DECEMBER 2018 - PRESENT

Blockchain Platforms

University at Buffalo & The State University of New York | via Coursera

NOVEMBER 2018 - PRESENT

Decentralized Applications (Dapps)

University at Buffalo & The State University of New York | via Coursera

OCTOBER 2018 - PRESENT

Smart Contracts

University at Buffalo & The State University of New York | via Coursera

OCTOBER 2018 - PRESENT

Blockchain Basics

University at Buffalo & The State University of New York | via Coursera

FEBRUARY 2003 - FEBRUARY 2004

MCT (Microsoft Certified Trainer)

Microsoft

MAY 2001 - MAY 2005

MCSD (Microsoft Certified Solutions Developer)

Microsoft

Skills

Libraries/APIs

Node.js, Web3.. js、Amazon API、REST API、Interactive Brokers API、Xamarin.Android, Xamarin.iOS, Mailchimp API, Mixpanel API, TensorFlow, React, Binance API, Keras, TensorFlow Deep Learning Library (TFLearn), Infragistics, LSTM

Tools

Microsoft Visual Studio, NPM, Jira, MetaMask, Git, Amazon Simple Notification Service (Amazon SNS), Perforce, Mongoose, Amazon Simple Email Service (SES), MQTT, SoapUI, Visual Studio, Confluence, Amazon Simple Queue Service (SQS), Crystal Reports

Frameworks

.NET, ASP.NET Core, .NET 4, .NET Core, ASP.NET MVC, ASP.NET, Express.js, Knockout (Knockout.js), React Native, Unity, Next.js

Languages

Solidity, C#, JavaScript, C++, C#.NET, Python, C, Assembly, SQL, TypeScript, C++11, Rust, HTML, Embedded C++, Go, Java, Perl, PHP, Haskell, GraphQL, Solidity Assembly

Paradigms

RESTful Development, Agile Software Development, Scrum, REST, Design Patterns, Application Architecture, Model View ViewModel (MVVM), Model View Controller (MVC), Kanban, Unit Testing, Microservices, Windows App Development, Object-relational Mapping (ORM), Mobile Development, Test-driven Development (TDD), Service-oriented Architecture (SOA), Functional Programming, Agile, Penetration Testing, Serverless Architecture

Platforms

Blockchain, Ethereum, Magento, Amazon Web Services (AWS), Blockchain Platforms, Linux, Arduino, Amazon Alexa, Android, iOS, Web, Xamarin, Unix, Windows, Amazon EC2, AWS Lambda, AWS IoT, Docker, Visual Studio Code (VS Code), Jupyter Notebook, Azure, Mobile, Twilio

Storage

JSON, Microsoft SQL Server, MySQL, PostgreSQL, Amazon DynamoDB, NoSQL, MongoDB

Industry Expertise

Banking & Finance, Trading Systems

Other

Ethereum Smart Contracts, Software Development, Software Architecture, Complex Problem Solving, Computer Science, Full-stack, Crypto, Architecture, Web 3.0, Back-end, Technical Architecture, Solution Architecture, Smart Contracts, SOAP, WebSockets, ESP8266, Internet of Things (IoT), HTTP, eCommerce, Trading, ESP32, Leadership, Technical Leadership, Team Leadership, Lean Project Management, Solana, Non-fungible Tokens (NFT), Token Design, Ethers.js，去中心化金融(DeFi)， api，区块链 & Cryptocurrency, Cryptocurrency, Algorithms, Rinkeby, Algorithmic Trading, Algorithmic Trading Analysis, IIS, Legacy Software, Windows Services, API Integration, Automated Trading Software, Stock Trading, Stock Analysis, Prediction Markets, Visualization, Data Engineering, Mobile Apps, Decentralized Systems, ERC-20, Fintech, Multithreading, Web Development, Lambda Functions, Enterprise Architecture, User Interface (UI), Domain-driven Design (DDD), RESTful Services, Internet服务器应用程序编程接口, COM, Embedded Systems, Real-time Operating System (RTOS), Customized Blockchains, Machine Learning, Defect Management, Arbitrage, Futures, Software, CI/CD Pipelines, OpenSea, Bots, DApps, Integration, Amazon RDS, Training, Web Security, Deep Learning, Hedge Funds, Finance, Statistics, Long Short-term Memory (LSTM), Neural Networks, Recurrent Neural Networks (RNNs), Gaming, R&D，演示，Web3，移动，比特币，云，WinDev

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John R. Kosinski

Verified Expert in Engineering

Full-stack Developer

Portfolio

Experience

Availability

Preferred Environment

The most amazing...

Work Experience

Software Developer

Leeds Rising

DeFi Architect

Patagon Management LLC

Technical Consultant

AxiomSys

Senior C# Web3 Developer

Garbles Labs

Enterprise C++ Developer

Alteryx

IoT Engineer

Jaber Medical

Alexa Developer

Anguleris Technologies

Alexa Developer

Sterling VC

R&D Manager

Futronix

Automated Trade Analyst

Event Driven Investor

Node.js Developer

Private Client

Freelance Senior Xamarin Developer

Aquamonix

Mobile Developer (Remote)

Door3/FreshDirect

Senior Developer | Team Leader

Manao Software

Software Development Manager

HotelTravel.com

Senior Developer

Morgan Stanley (NYC)

Experience

Bond Vault for EVM Blockchains

Zeppelin: EthGlobal 2023 Hackathon Winner

Common NFT Contract Design Anti-patterns

Security Manager Design Pattern in Solidity

Ethernaut Solutions

Krew NFT Project

FreshDirect iOS

Aquamonix iOS

IoT Demo for Alexa

Medium Articles

为Keras LSTM输入准备和整形时间序列数据

开始物联网开发:ESP8266 Arduino教程

以太坊甲骨文合约:我们能信任甲骨文吗?

以太坊Oracle合约:稳定性代码特性

以太坊Oracle合约:设置和方向

Education

Bachelor of Science in Computer Science

Certifications

AWS Certified Solutions Architect – Associate

Blockchain Platforms

Decentralized Applications (Dapps)

Smart Contracts

Blockchain Basics

MCT (Microsoft Certified Trainer)

MCSD (Microsoft Certified Solutions Developer)

Skills

Libraries/APIs

Tools

Frameworks

Languages

Paradigms

Platforms

Storage

Industry Expertise

Other

How to Work with Toptal

Share your needs

Choose your talent