Full-stack Developer
2018 - 2018Open Polytechnic of New Zealand (via Toptal)- Refactored old AngularJS learner's dashboard page into Angular 5.
- Implemented proof-of-concept feature for learners to set custom course start and end date.
- Refactored old integration tests written in mocha into WDIO (WebDriverIO) tests so that multiple tests can be run simultaneously.
- Worked on portfolio (course model structure) migration and refactored the related API endpoints.
- Ensured multiple reviewers can be added to the courses.
Technologies: Angular, AngularJS, Node, Express, WDIO, Grunt, TypeScript, MochaFull-stack Python Developer
2018 - 2018S3: Shapiro Settlement Solutions (via Toptal)- Re-implemented data extraction from Excel file into various microservices databases based on their new `ETL workflow.
- Updated database models definition in Cloud Datastore which is used in the new extraction flow.
- Implemented transformation of imported column data through front-end UI in React.
- Refactored back-end APIs for preloading of entity and relationship options in Python.
- Implemented UI and back-end APIs for mapping relationships between entities imported from Excel files.
Technologies: Python, Microservice, Google App Engine, Google Cloud Datastore, React, Redux, GraphQL, StoryBook, FlaskFront-end Web Developer
2018 - 2018Megawarne Consulting (via Toptal)- Implemented new UI layout with Ant Design.
- Refactored authentication logic with redux-auth-wrapper.
- Implemented Web socket communication between back-end and front-end through MsgPack - binary serialization format.
- Implemented showing of field level validation error message from the backend api response with redux-form and promise handling.
- Tested and demonstrated React components using Storybook.
- Introduced the HOCs for code reuse, logic and bootstrap abstraction.
- Implemented live detection view through web socket subscription.
Technologies: React.js, Redux, Web Socket, MsgPack, Redux-Form, Ant Design, Storybook, Java, Maven, Vagrant, Virtual Box, PostgresSr. UI Developer
2017 - 2017OpenRisk Technologies LLC (via Toptal)- Implemented Kafka topics UI into the React.js/Redux web app to handle real-time data feeds.
- Created multi-dimensional stocks chart with AmChart.
- Implemented complex diagram visualization and interaction with Ogma.
- Tested and demonstrated React components using Storybook.
- Refactored authentication logic with redux-auth-wrapper.
- Utilized Immutable.js with PureComponent to boost the performance.
Technologies: React.js, Redux, Redux-Saga, Immutable.js, AmCharts, HighCharts, D3, RxJS, Material UI, Storybook, Kafka, OgmaShopify Developer
2016 - 2016Polysleep- Built an e-commerce platform with Shopify to sell mattress for stress-free sleep.
- Implemented customer reviews section by building a custom plugin app.
- Implemented multi-language support in English and French with langify.
Technologies: Shopify, Ruby, SCSSFull-stack developer
2016 - 2016Mosaic Sustainability- Built a custom CMS to manage micro sites, pages, groups and users.
- Developed RESTful APIs to connect tableau server and get response data.
- Implemented the view of tableaus with user-specific settings.
- Built front-end with Angular 2.
Technologies: Ruby on Rails, Angular, Github, TableauFull-stack Web Developer
2015 - 2016Theme Paradise- Worked on part-time engagment for building of several responsive multi-purpose WordPress themes.
- Built my own WordPress theme framework called Crystal.
- Strong experience with building WordPress shortcodes along with Visual Composer.
Technologies: PHP, WordPress, Javascript, jQueryWeb Developer
2015 - 2016Nelou- Built a RESTful API for web and mobile app.
- Developed cross-browser compliant front-end using AngularJS.
- Tested front-end using Jasmine and back-end using Mocha.
- Implemented an integration with Stripe for card payment processing.
- Identified and corrected software deficiencies.
Technologies: Ruby on Rails, Angular, Bitbucket, Mocha, GitFull-stack Web Developer
2015 - 2015Charibin- Developed a fundraising auction system with Meteor.js.
- Improved UI and UX with Bootstrap based on the mockup provided.
- Revamped project setup and deployment with iron-cli and mupx.
- Built a module to cache the backend API responses in the front-end to improve performance.
- Conducted technical and functional research and analysis.
Technologies: Meteor.js, Stripe, Bootstrap, Iron-cli, Google Places API, GuideStarWeb Developer
2012 - 2014Manglobe, Inc.- Worked as a internal developer to maintain and upgrade the web app for their internal management system.
- Scripted in Python and Shell for system administration and data processing.
- Led a team of developers implementing business applications on top of the in-house developed RAD tool.
- Designed and built a real-time chat module.
- Implemented a continuous integration and deployment process.
- Improved development and testing workflow with virtualization and container technologies.
Technologies: Ruby on Rails, Python
Leo Esaki
JavaScript Developer in Tokyo, Japan
Member since September 7, 2017
Leo is a talented and passionate full-stack developer with a focus on front-end development with React.js and Angular. He is also specialized in web and service-oriented applications and dynamic languages such as JavaScript, Python, Ruby, PHP, etc. Leo is passionate about working with motivated teams and getting things done. Currently, he prefers to work with React.js and Redux. He strictly adheres to the DRY principle and KISS approach.
Leo is now available for hire
Portfolio
- Open Polytechnic of New Zealand (via Toptal)Angular, AngularJS, Node, Express, WDIO, Grunt, TypeScript, Mocha
- S3: Shapiro Settlement Solutions (via Toptal)Python, Microservice, Google App Engine, Google Cloud Datastore, React, Redux...
- Megawarne Consulting (via Toptal)React.js, Redux, Web Socket, MsgPack, Redux-Form, Ant Design, Storybook, Java...
Experience
- JavaScript, 10 years
- Ruby on Rails (RoR), 7 years
- Angular, 6 years
- Python, 6 years
- Django, 6 years
- React, 6 years
- Redux, 4 years
- ECMAScript (ES6), 3 years
Availability
Part-time
Preferred Environment
Ubuntu, Mac, Git, Sublime Text, Atom, PyCharm
The most amazing...
...project I've worked on is a Fintech platform that provides a portfolio management solution with intuitive dashboards and console for both clients and advisors.
Employment
Experience
- Mosaic Tableau Management (Development)
- Built a custom CMS to manage microsites, pages, groups, and users.
- Developed RESTful APIs to connect tableau server and get response data.
- Implemented the view of tableaus with user-specific settings.
- Built front-end with Angular 2. - Nelou CMS (Development)
- Developed a RESTful API for web & mobile app.
- Developed front-end using AngularJS.
- Tested front-end using Jasmine and back-end using Mocha.
- Implemented an integration with Stripe for card payment processing.
- Identified and corrected software deficiencies.
Skills
Languages
CSS3, SQL, GraphQL, JavaScript, C++, C, Sass, HTML5, Python, PHP, ECMAScript (ES6), ES7, JavaFrameworks
Laravel, Redux, Angular, Django, Koa, Express.js, Ruby on Rails (RoR)Libraries/APIs
React Redux, Ramda, Lodash, Redux-saga, Redux Form, D3.js, jQuery, React, Node.js, PayPal APITools
GitHub, Bitbucket, Redux Thunk, Webpack, Sublime Text 3, SlackParadigms
Object-oriented Programming (OOP), Functional Programming, REST, Continuous Integration (CI)Platforms
WordPress, Shopify, Ubuntu, Windows, MacOSStorage
MySQL, MongoDB, SQLite, PostgreSQL, RedisOther
SSH
Education
- Bachelor's degree in Computer Engineering2008 - 2012Tokyo University of Science - Tokyo, Japan
