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Donaldo – React Native, React, Typescript, experts in Lemon.io

Donaldo

From Guatemala (GMT-6)

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Mobile DeveloperSenior
Front-end Web DeveloperSenior
Hire developer
5 years of commercial experience
Consumer services
Customer support
Edtech
Entertainment
Fintech
Social media
Sports
CRM
Mobile apps
Video streaming software
Lemon.io stats
1
projects done
224
hours worked
Open
to new offers

Donaldo – React Native, React, Typescript

Sebastian, a seasoned Front-End and Mobile Developer, is your React Native expert, known for optimizing app performance and ensuring seamless usability on various screen sizes, including TV apps. His remarkable achievement includes independently customizing React Native's Flatlist component. What truly sets Sebastian apart is his sense of responsibility and dedication to delivering top-quality work. His motto, "The way to learn fast is to act now," reflects his proactive approach to growth and excellence. Beyond coding, you'll find Sebastian exploring his passion for enduro in his spare time.

Main technologies
React Native
3 years
React
4 years
Typescript
4 years
Additional skills
Kotlin
Swift
AWS
Python
Node.js
Angular JS
GitHub Actions
AWS Lambda
Jest
DynamoDB
Docker
CI/CD
OpenAI
Figma
JavaScript
Redux
Tailwind CSS
Expo
Ionic
Supabase
Ready to start
ASAP
Direct hire
Potentially possible

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Experience Highlights

Senior Software Engineer
Jan 2024 - Oct 20248 months
Project Overview

Streaming application

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Responsibilities:
  • Created end to end application;
  • Integrated with Adobe, did a native bridge for both Kotlin and Swift;
  • Translate Figma to pixel perfect app.
Project Tech stack:
React Native
Typescript
Redux
Senior Software Engineer
Dec 2023 - Jun 20245 months
Project Overview

This is a Canadian company that operates a diverse portfolio of media assets. It includes several radio stations and digital platforms, delivering a variety of content ranging from news and entertainment to music and sports. The company focuses on serving local communities with high-quality media services, engaging audiences through both traditional and digital channels.

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Responsibilities:
  • Created a new architecture for server-driven UI, just as Shopify for creating stores;
  • Developed the mobile app;
  • Built the web application's core using Typescript and Next.js;
  • Created e2e and unit tests.
Project Tech stack:
React Native
Typescript
Redux
Next.js
Senior software Engineer
Oct 2023 - Feb 20244 months
Project Overview

This application is designed to revolutionize communication. It utilizes geofence technology to allow users to view posts within a selected perimeter.

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Responsibilities:
  • Created front-end architecture;
  • Created landing website in Next.js;
  • Wrote unit test cases;
  • Integrated with maps and camera/camera roll;
  • Redisigned the Figma for the app;
  • Created mobile app in both iOS and Android, creating CI/CD for sending it to testflight and Google Play;
  • Created mobile app version on the web with React.
Project Tech stack:
React Native
React
Swagger
OpenAPI
Python
Vercel
Next.js
Project Manager, Tech Lead
Jun 2023 - Aug 20232 months
Project Overview

Is a CRM for clients in Spain which are mainly universities.

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Responsibilities:
  • Checked project roadmap;
  • Created an API consolidating many APIs like META, Linkedin, etc;
  • Developed the architecture of the project.
Project Tech stack:
GraphQL
Apollo Client
Node.js
Python
FastAPI
AWS
Clean Architecture
React
Material UI
Software Developer, Team Lead
Mar 2023 - Jul 20234 months
Project Overview

It's a streaming platform in India.

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Responsibilities:
  • Migrated all the code to a new architecture I created in previous projects;
  • Lead the migration at a technical level;
  • Created CI/CD pipelines.
Project Tech stack:
React Native
Kotlin
Swift
Redux
Team Lead
Nov 2022 - Feb 20233 months
Project Overview

It's a sports-based application in the Philipines that live streams events and has pre-recorded content.

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Responsibilities:
  • Established the front-end architecture;
  • Implemented payments APIs;
  • Made sure the libraries I created were maintained adequately by making CI/CD pipelines and checking PRs;
  • Supervised a team;
  • Conducted code reviews.
Project Tech stack:
React Native
React
JavaScript
Typescript
Redux Toolkit
Kotlin
Swift
Storybook
Tech Lead
Feb 2022 - Jul 20225 months
Project Overview

It's a product app designed as a template to onboard clients as soon as possible.

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Responsibilities:
  • Came up with a front-end architecture and redesigned the existing front-end;
  • Built Figma designs hand-to-hand with a team of designers;
  • Crafted a common architecture to involve both TV and mobile apps with a shared directory;
  • Created a focus library for tvOS to get a native focus navigation without any delays;
  • Solved issues in CPU usage, memory RAM usage, application size, FPS, and time to interaction;
  • Liaised with a team of cybersecurity engineers to ensure application safeness;
  • Implemented analytics, IAP, video player, push notifications, and Firebase Crashlytics;
  • Contributed to the React Native community, fixing RTL issues in libraries as React Native pager view;
  • Wrote unit, integration, and e2e tests.
Project Tech stack:
React Native
Babel
Kotlin
Swift
Storybook
Styled-components
Jest
ESLint
CI
CD
GitHub Actions
Figma
Redux
Redux Toolkit
Axios
Typescript
Cyber security
Team Lead
Nov 2021 - Feb 20223 months
Project Overview

It's a streaming application in the United States.

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Responsibilities:
  • Maintained the app and added new features;
  • Performed code reviews;
  • Oversaw interactions with the client.
Project Tech stack:
React Native
Objective C
Typescript
React
React Hooks
Tech Lead
Feb 2021 - Oct 20218 months
Project Overview

It's a big OTT streaming app in India.

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Responsibilities:
  • Crafted the web architecture and optimized the app;
  • Came up with SSR for app deployment and built deployment pipelines;
  • Created Node server and utilized Docker and Kubernetes;
  • Lead a team of 11 developers;
  • Participated in discussions with clients;
  • Did code reviews.
Project Tech stack:
Angular
React
Styled-components
Jest
Angular Material
Docker
Kubernetes

Education

2022
Computer Science Engineering
Bachelor degree

Languages

English
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