Jefferson Moura Amador de Oliveira, Software Developer in Barnstable, MA, United States
Jefferson Moura Amador de Oliveira

Software Developer in Barnstable, MA, United States

Member since November 23, 2021
Jefferson is a senior React developer with around six years of experience building amazing web apps for clients like iRobot, Ford, and Tremendous. He focuses on data performance and user experience, including accessibility and A/B testing, and he also has a good background in user tracking and behavior analysis. Jefferson values transparency, commitment, communication, and attention to detail.
Jefferson is now available for hire


  • Genome
    React Native, React, Firebase, Unity3D, TypeScript, Next.js, GraphQL...
  • Tremendous, Inc
    Ruby on Rails (RoR), JavaScript, React, Chrome API, Next.js
  • Conta AS
    AngularJS, Elm, JavaScript, React



Barnstable, MA, United States



Preferred Environment

MacOS, Visual Studio Code, Slack, GitHub

The most amazing...

...thing I worked on was, an app that serves 2% of Norwegian people and delivers millions of quotes and invoices every day.


  • Front-end Engineer

    2020 - 2021
    • Developed the CMS for the iRobot Kiosk app that you can find on BestBuy around the US.
    • Worked on the development of a prayer app that uses engagement through sharing encouragement, praying with and for others, and allowing space in your day to meditate.
    • Developed and worked on Holr, an app that allows influencers to share their content into a paid subscription format and grow their fanbase with exclusive content.
    Technologies: React Native, React, Firebase, Unity3D, TypeScript, Next.js, GraphQL, Firebase Web SDK, Firebase Cloud Functions, Algolia
  • Full-stack Engineer

    2020 - 2021
    Tremendous, Inc
    • Implemented two new methods to redeem the rewards; one in partnership with Coinbase the clients can get cryptocurrency, and Public where the rewards can be redeemed as stocks.
    • Developed the reward recommendation redemption that highlights the best reward for users. This was foreshadowed to increase the revenue by 2.4% in the next year and the adoption rate was 34%.
    • Created a Chrome extension that allows the clients to use their rewards without leaving the website they’re currently using.
    Technologies: Ruby on Rails (RoR), JavaScript, React, Chrome API, Next.js
  • Front-end Engineer

    2016 - 2020
    Conta AS
    • Worked on the Salg project, a quote generator that handles all of the processes from estimate to sale. The project increased the revenue by 23% and was the third most used module of the app.
    • Created A/B case tests, and was responsible for introducing and developing a big part of the accessibility code. I also implemented all animations and user interactions.
    • Implemented part of the bookkeeping module, which is the most important module of the app, and is being used by 2% of the Norwegian population.
    Technologies: AngularJS, Elm, JavaScript, React
  • Co-founder | Full-stack Developer

    2015 - 2016
    Aurum Sistemas
    • Developed part of an app for a startup that made success in Kickstarter and TechCrunch in 2014; this was the controller for a boosted board, with GPS built-in.
    • Planned and developed a web app to manage a white label soccer team fan club, that was later sold for three teams of regional league in Brazil.
    • Developed the logic for an indoor tracking system to be used in a shopping center, that could give users coupons for stores they were passing by and also provide them important information about the mall.
    Technologies: Node.js, React, JavaScript, Python, Django
  • Web Developer

    2014 - 2015
    Varlik Soluções
    • Created websites for dealers in the northeast and north of Brazil.
    • Developed an internal tool to accelerate the website production that increased by 33% the development speed.
    • Fixed bugs using user-tracked data, and also increased UI performance from those reports.
    Technologies: WordPress, AngularJS, JavaScript


  • 2GTHR App

    2GTHR is a well-being app that uses engagement through sharing encouragement, praying with and for others, allowing space in your day to meditate. 2GTHR connects individuals in a meaningful relationship they can have with each other, with yourself, and with God.

  • Tremendous Wallet

    A digital wallet to access rewards you redeemed from; also fills out checkout pages with card information, gift cards codes, and coupons from your rewards without exiting the current website.

  • Holr App

    It was a subscribe-to-follow social network that enables content creators to post exclusive content to their fanbase and generate income from those followers and generate more engagement through special events participation and perks.


  • Languages

    JavaScript, HTML5, TypeScript, Elm, Python, GraphQL
  • Frameworks

    Next.js, React Native, AngularJS, Ruby on Rails (RoR), Unity3D, Django
  • Libraries/APIs

    React, Chrome API, Node.js, Firebase Web SDK
  • Platforms

    Firebase, Visual Studio Code, WordPress, MacOS, Algolia
  • Tools

    Slack, GitHub
  • Other

    Firebase Cloud Functions


  • Software Development
    U.S. Equivalence of Formal Education (USCES)

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