Jefferson is available for hire
Hire JeffersonJefferson Moura Amador de Oliveira
Verified Expert in Engineering
Software Developer
Location
Barnstable, MA, United States
Toptal Member Since
December 7, 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.
Portfolio
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
Experience
Availability
Part-time
Preferred Environment
MacOS, Slack, GitHub, Visual Studio Code (VS Code)
The most amazing...
...thing I worked on was Conta.no, an app that serves 2% of Norwegian people and delivers millions of quotes and invoices every day.
Work Experience
Front-end Engineer
2020 - 2021
Genome
- 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
Experience
2GTHR App
https://play.google.com/store/apps/details?id=com.seedpray2GTHR 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 Tremendous.com; 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.
Skills
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 (VS Code), WordPress, MacOS, Algolia
Tools
Slack, GitHub
Other
Firebase Cloud Functions
Certifications
DECEMBER 2020 - PRESENT
Software Development
U.S. Equivalence of Formal Education (USCES)
Collaboration That Works
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