Danny Wang
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Danny Wang

Danny Wang  new_releases

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Fullstack Blockchain Engineer
United States

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Flexible work
Starting at USD50/hour
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Starting at USD50/hour
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Résumé

Jobs verified_user 0% verified
  • Zipmex
    Senior Full Stack Blockchain Engineer public Remote experience
    Zipmex
    Oct 2019 - Dec 2020 (1 year 3 months)
    • Audited a complex Node.js React/Redux web application to identify security concerns and performance issues. • Developed signal and trading bots using cryptocurrency exchange APIs in Node.js. • Architected the payment and collateral system on the Ethereum blockchain. • Developed and deployed Solidity contracts on Ethereum blockchain using Truffle and OpenZepplin, and used Web3.js to publish and execute contracts, RPC calls on the test, and main networks. • Administered full Ethereum, BTC, and Altcoin nodes in the local and production environment using AWS, Terraform, and Docker (ECS). • Integrate CI/CD in AWS with GitHub actions and Terraform. • Developed mockup with Ruby on Rails for funding.
  • Coinuma
    Senior Full Stack Blockchain Engineer public Remote experience
    Coinuma
    Aug 2018 - Aug 2019 (1 year 1 month)
    • Developed a trading engine for a crypto exchange to perform algorithm and rule-based trades in Ruby on Rails. • Built user modules to provide CRUD operations on the role, user, team, organization, and user modules in Ruby on Rails. • Converted a Rest API approached service to graphQL to boost front-end UI needs. • Developed pub/sub-models for Bitcoin, Ethereum, Ripple blockchains to provide accounting service for the exchange with Node.js. • Migrated database from RDS MySQL to Aurora to handle scaling and distributed infrastructure. • Integrated Elasticsearch to perform complex queries and searching with minimal response time. • Extended Electrum library to support HD wallet keys and derivation from the path by using extended public keys.
  • Brightsave
    Senior Fullstack Javascript Developer public Remote experience
    Brightsave
    Jan 2018 - Jun 2018 (6 months)
    •Architected a complete end-to-end microservice-based scalable and high-availability frontend and backend solution based on AWS services and leveraging open source technologies like React and Node.js. •Designed and developed several serverless GraphQL APIs with Node.js, leveraging multiple AWS services (including Cognito, Lambda, API Gateway, DynamoDB, and Aurora) to serve as a back-end for multiple client apps. •Designed and developed several responsive PWA client apps using a React/Redux/Sagas stack, leveraging AWS Cognito for user authentication and authorization, including authorization and access to the aforementioned GraphQL APIs. •Developed an entire CI/CD pipeline consisting of a complex orchestration of multiple AWS services (inclu
  • TourRadar
    Full Stack Engineer public Remote experience
    TourRadar
    Jan 2017 - Dec 2017 (1 year)
    •Build an OAuth login system for head out and integrated one-click login microservice using all the major social networks. •Scaled APIs to handle up to 100,000 requests per minute and Docker-based deployment for quick horizontal scaling. •Refracted database operation with Sequelize ORM and tuned it, which resulted in managing connection pools with almost 0 errors and dropping connections. •Migrated some async workers from VM-based infrastructure to serverless infrastructure, which effectively reduced the cost of AWS. •Performed A-B testing both on front-end and back-end parts to analyze certain business parameters to increase profits.
  • Sazze
    Mobile Application Developer public Remote experience
    Sazze
    Mar 2015 - Sep 2016 (1 year 7 months)
    • Worked on 3 projects - Dealsplus, Whym, BlackFriday. • Implemented Dealsplus application for both iOS and Android with Objective-C and Java. • Implemented Whym application for both iOS and Android with Swift and Java. • Implemented BlackFriday application for both iOS and Android with Objective-C and Kotlin. • Adapted the app navigation flow and the UX/UI following Google's material design guidelines. • Built the app's design and navigation flows using AutoLayout.
  • L
    Mobile Application Developer public Remote experience
    Lapa Studio
    Jan 2013 - Dec 2014 (2 years)
    - Developed an Android and iOS object tracker app that located external devices via Bluetooth. - Integrated with Parse Android lib, REST API, and cloud functions. - Implemented push notification and geolocation queries. - Adapted the app navigation flow and the UX/UI following Google's material design guidelines. - Implemented the authentication system, allowing both Facebook and email registration - Created and documented a RESTful mobile API using Ruby on Rails.
Education verified_user 0% verified
  • York University
    Bachelor's Degree
    York University