Zack is available for hire

Zack Yang

Verified Expert in Engineering

Software Developer

Location

Sydney, New South Wales, Australia

Toptal Member Since

March 23, 2022

Zack is a full-stack engineer with 10 years of experience building and polishing products for startup companies, focused on fintech and eCommerce. He has a solid understanding of concise coding principles and best practices and is proficient with Node.js, Ruby, JavaScript, React, PostgreSQL, MongoDB, and CI/CD. Zack created an eCommerce app that reached the top three in the Apple Store Life category, led teams, and delivered a dynamically configurable discount and reward system.

Full-stack Front-end Back-end Full-stack Development CSS5 MacOS Ruby Ruby on Rails (RoR)SQL Rails Engines API Development Redis Sidekiq REST APIs CSS Stripe

Portfolio

Forbes Media - Q.ai - Main

Ruby on Rails (RoR), React, Google Cloud Platform (GCP), Apache Kafka, RabbitMQ...

Myfoodlink

Vue, Ruby on Rails (RoR), MongoDB, CSS, SEO Tools, APIs, Ubuntu, Redis...

Sentia Australia

JavaScript, Ruby on Rails (RoR), PostgreSQL, React, React Redux, Redis, Ubuntu...

Experience

Ruby on Rails (RoR) - 10 years JavaScript - 7 years PostgreSQL - 6 years Node.js - 4 years React - 4 years Express.js - 4 years TypeScript - 3 years Next.js - 2 years

Availability

Part-time

Preferred Environment

MacOS, Slack, Zoom, Google Meet, Jira, Tailwind CSS, Unit Testing, MERN Stack, RSpec, Next.js, Front-end, Rails Engines

The most amazing...

...high-speed eCommerce platform I've built was for a mobile phone manufacturing company where the number of orders generated per second exceeds 50,000.

Work Experience

Senior Software Engineer

2022 - 2023

Forbes Media - Q.ai - Main

Completed new dashboard design and code implementation and refactoring the legacy code.
Improved the availability and stability of services by optimizing data structures and algorithms, increasing the trading success rate from about 50% to 96%.
Implemented the architecture of a microservice system.
Designed and implemented the architecture of the automatic test program.
Managed and maintained the most important business services.
Managed and maintained daily business tasks.

Technologies: Ruby on Rails (RoR), React, Google Cloud Platform (GCP), Apache Kafka, RabbitMQ, APIs, Auth0, Google Cloud, Tailwind CSS, REST, CI/CD Pipelines, RESTful Services, Front-end, Rails Engines, Serverless, Front-end Development, ECMAScript (ES6), API Development

Software Engineer

2020 - 2021

Myfoodlink

Developed a service that automatically obtains product details through barcodes or product descriptions. It means that retailers do not need to enter detailed product information themselves.
Implemented the API service that automatically binds product images and product pages via OCR.
Implemented the store's template system, allowing customers to quickly deploy the website and list products through existing templates.

Technologies: Vue, Ruby on Rails (RoR), MongoDB, CSS, SEO Tools, APIs, Ubuntu, Redis, Software Testing, Software Analysis, Human-computer Interaction (HCI), HTML, HTML5, Back-end, CSS5, GraphQL, Mocha, Haml, GitHub, Git, Node.js, Amazon Web Services (AWS), TypeScript, WebSockets, Pub/Sub, Stripe, Full-stack, Unit Testing, Sideqik, MySQL, jQuery, Express.js, Sidekiq, Scalability, Amazon RDS, JavaScript, RSpec, REST APIs, Next.js, Docker, Jest, Cypress, REST, CI/CD Pipelines, RESTful Services, Front-end, Tailwind CSS, Rails Engines, Serverless, AWS Lambda, Sass, Front-end Development, ECMAScript (ES6), API Development, Elasticsearch, eCommerce, Google Maps SDK

Full-stack Engineer

2017 - 2019

Sentia Australia

Implemented the development of a large-traffic data API and a single server that can process more than 10,000 real-time data per minute.
Participated in the development of a financing platform application for the Australian market. Completed multiple third-party services development for financial institutions.
Delivered a dynamically configurable discount and reward system for eCommerce platforms. Users can quickly create discount and point rules for products through the background DSL.

Technologies: JavaScript, Ruby on Rails (RoR), PostgreSQL, React, React Redux, Redis, Ubuntu, RSpec, Capybara, Jira, CSS, SEO Tools, APIs, New Relic, Software Testing, Software Analysis, HTML, HTML5, Back-end, SQL, CSS5, GitHub, Git, Node.js, Amazon Web Services (AWS), WebSockets, Full-stack, Unit Testing, Sideqik, jQuery, Express.js, Sidekiq, Scalability, Amazon RDS, MERN Stack, REST APIs, Jest, REST, CI/CD Pipelines, RESTful Services, Front-end, Rails Engines, AWS Lambda, Sass, Front-end Development, ECMAScript (ES6), Jenkins, API Development, Elasticsearch

Senior Full-stack Engineer

2013 - 2015

Stylesaint

Developed the entire order system of the application integrated multiple payment methods, including Stripe, PayPal, and Braintree.
Implemented a unified authentication solution for different web servers. Multiple applications can share the registration and authentication.
Oversaw the creation and maintenance of the company's AWS cloud server cluster.

Technologies: Backbone.js, Backbone.Marionette, Ruby on Rails (RoR), PostgreSQL, New Relic, CSS, APIs, Redis, Software Analysis, Software Testing, Human-computer Interaction (HCI), HTML, HTML5, Back-end, SQL, CSS5, GraphQL, MongoDB, Mocha, EJS, Haml, GitHub, Git, Node.js, Amazon Web Services (AWS), Spree, Stripe, Full-stack, Unit Testing, Sideqik, jQuery, TypeScript, Sidekiq, Scalability, Amazon RDS, JavaScript, RSpec, REST APIs, Heroku, CI/CD Pipelines, Front-end, Rails Engines, Sass, Front-end Development, API Development, eCommerce

Senior Web Developer

2011 - 2014

Foxconn

Released our eCommerce app released, reaching the top three in the Apple Store Life category in Taiwan.
Led a team to design and develop the company's web server framework based on Ruby.
Oversaw the architecture of the eCommerce server. Created, tracked, and tested ticket development through project management tools.
Developed a high-speed eCommerce platform for OEM mobile phone companies. The number of orders generated per second exceeds 50,000.

Technologies: Node.js, Ruby, PostgreSQL, CentOS, APIs, Redis, Software Analysis, Software Testing, HTML, HTML5, Back-end, SQL, Full-stack, Unit Testing, Sideqik, MySQL, jQuery, Memcached, Sidekiq, JavaScript, Front-end, Rails Engines, Front-end Development, API Development, Google Maps SDK

Experience

MyFoodlink

https://myfoodlink.com.au/

Myfoodlink provides a fully hosted specialist online supermarket eCommerce platform for supermarkets and grocers. Myfoodlink can also help in website design and build, graphic design, sales and marketing, and shopping applications for smartphones.

Ezy Raise

https://www.ezyraise.com

Ezy Raise is a peer-to-peer fundraising platform provider, creating, maintaining, and supporting profiles for global charity organizations. Clients can customize the theme and feature and integrate third-party APIs (Fitbit, Garmin, etc.)

MLAPP

https://mlapp.com.au/

Mlapp.com.au is an Australia-based fintech project that helps users compare, save, and find a product among hundreds of financial institutions in Australia to suit users' needs.

I was the principal engineer for MLAPP and built the main structure of the front end and back end.

Forbes Q.ai

https://start.tryq.ai/

Q.ai is an AI-powered investing app from Forbes that lets you invest in a wide range of portfolios. Its unique selling point is that many portfolios have a hedging feature to provide downside protection. Portfolios also invest in a range of assets like stocks, ETFs, commodities, and crypto.

Mable

https://mable.com.au/

Mable is an online platform that connects people looking for disability and aged care support with independent support workers (mable.com.au/). It allows people to find local support workers and make choices around their care needs.

Skills

Languages

Ruby, JavaScript, CSS, HTML5, HTML, SQL, Haml, TypeScript, Sass, ECMAScript (ES6), GraphQL, Python

Frameworks

Ruby on Rails (RoR), Ruby on Rails 4, Bootstrap, Express.js, Tailwind CSS, Next.js, Capybara, Redux, Ember.js, Jest, Cypress, Angular

Libraries/APIs

React, Node.js, Backbone.js, REST APIs, EJS, Stripe, jQuery, Sidekiq, Rails Engines, API Development, Google Maps SDK, React Redux, Vue, Backbone.Marionette, Antd

Tools

RSpec, Git, GitHub, Webpack, Spree, Slack, Mocha, Jenkins, Zoom, Jira, RabbitMQ, Auth0, Figma

Paradigms

Unit Testing, REST, Software Testing, Human-computer Interaction (HCI), Microservices, Scrum, Agile

Platforms

MacOS, Sideqik, Google Cloud Platform (GCP), Ubuntu Linux, Linux, CentOS, Ubuntu, Amazon Web Services (AWS), Docker, Heroku, AWS Lambda, New Relic, Apache Kafka, Kubernetes

Storage

PostgreSQL, Redis, MongoDB, MySQL, Memcached, Google Cloud, Elasticsearch

Other

APIs, CSS5, Full-stack, Back-end, WebSockets, Full-stack Development, Scalability, RESTful Services, Front-end, Front-end Development, Technical Leadership, eCommerce, Software Engineering, SEO Tools, Software Analysis, Pub/Sub, Amazon RDS, MERN Stack, CI/CD Pipelines, Serverless, Google Meet, Artificial Intelligence (AI), Planning

Education

2015 - 2017

Master's Degree in Computer Science

University of Wollongong - Wollongong, NSW, Australia

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