Jhoseph is available for hire
Hire JhosephJhoseph Guerrero
Verified Expert in Engineering
Full-stack Web Developer
Maracaibo, Zulia, Venezuela
Toptal member since May 19, 2022
Bio
Jhoseph is a full-stack web developer passionate about crafting scalable web solutions and innovative applications for startups and enterprises. With proven expertise in multiple aspects of the software development process, he has added significant value to the teams and projects he participated in. Jhoseph is willing to create new outstanding solutions to solve real-world problems and positively impact people's lives while learning new things and continuously growing as a developer.
Portfolio
Indeed
JavaScript, TypeScript, React, GraphQL, Node.js, Jest, Storybook, Software...
RNWBL, LLC
JavaScript, React, GraphQL, Redux, TypeScript, Mapbox
Redxam inc
Node.js, GraphQL, MongoDB, SendGrid, Web3.js, Ethers.js, APIs, TypeScript...
Experience
- Node.js - 4 years
- Programming - 4 years
- React - 4 years
- Web Development - 4 years
- GraphQL - 2 years
- Next.js - 2 years
- MongoDB - 2 years
- TypeScript - 1 year
Availability
Part-time
Preferred Environment
Windows 10, Visual Studio Code (VS Code), Figma, Discord, Slack, Ubuntu, ChatGPT
The most amazing...
...solution I've developed is an A/B testing platform development for Indeed, enhancing job listings' visibility and applications by dynamic experimentation.
Work Experience
Senior software engineer
2022 - PRESENT
Indeed
- Led the development of an A/B testing platform for Indeed, enabling dynamic updates to job listings for enhanced visibility and application rates, driving significant improvements in user engagement and operational efficiency.
- Developed a comprehensive debug tool app for testing API requests across production and QA environments. This app facilitates variable experimentation and response monitoring, significantly enhancing app development and debugging processes.
- Implemented GraphQL CodeGen across multiple projects, significantly streamlining development with automated type generation. Also built and refactored entire pages and components, enhancing project scalability and maintainability.
Technologies: JavaScript, TypeScript, React, GraphQL, Node.js, Jest, Storybook, Software, GraphQL Code Generator
React Developer
2022 - 2023
RNWBL, LLC
- Developed the DSPTCH app, which streamlines technician job management and operations with automation, job-skill matching, and real-time analytics, driving efficiency and client satisfaction.
- Implemented robust CSV/PDF export functionalities, optimizing data processing and presentation, and significantly improved component scalability and performance through strategic refactoring.
- Engineered high-performance React components and pages, including interactive charts, multi-action tables, and file upload modals.
- Integrated advanced Mapbox features for dynamic mapping, enhancing UI/UX and providing users with rich, interactive geographical data visualization.
- Implemented GraphQL for robust data management, using CodeGen for query and mutation generation, which optimized performance and data handling.
- Refactored existing components for scalability and performance, reducing unnecessary re-renders and improving code readability and maintainability.
Technologies: JavaScript, React, GraphQL, Redux, TypeScript, Mapbox
Full-stack Developer | Back-end Lead
2021 - 2022
Redxam inc
- Deployed a Bitcoin node to independently track transactions, eliminating third-party API reliance and saving substantial monthly costs.
- Managed interactions with Polygon network smart contracts to track deposits and wallet balances and facilitate wallet transactions.
- Developed reusable, scalable React components, enhancing the project's codebase for efficiency and readability.
- Refactored complex React components, significantly improving their efficiency, readability, and reusability.
- Engineered GraphQL resolvers and queries to streamline front-end data delivery with optimized business logic.
- Handled server deployment, managing PM2, Nginx, and CircleCI pipelines, gaining valuable experience in deployment strategies.
Technologies: Node.js, GraphQL, MongoDB, SendGrid, Web3.js, Ethers.js, APIs, TypeScript, CircleCI, Bitcoin, Polygon, React, Next.js, Tailwind CSS, HTML, CSS, JavaScript
Full-stack Developer
2019 - 2021
Devsktop
- Analyzed multiple real-life problems and designed, built, and provided a solution with automated software.
- Designed multiple user-friendly interfaces that became clients' preferences for their projects.
- Developed multiple applications from the ground up and configured the project structure.
- Created reusable and scalable React components that are easy-readable and can be used along with all the projects.
- Implemented the memoized Redux selector to get better time performance on rendering list components, optimizing from 250 to 14 minutes.
- Designed and built REST APIs to serve the front end of multiple applications.
- Oversaw and built relational databases with MySQL.
Technologies: ECMAScript (ES6), React, Redux, React Router, Electron, Node.js, Sass, Express.js, MySQL, User Interface (UI), User Experience (UX), HTML, CSS, JavaScript
Web Developer
2018 - 2019
Freelance
- Interviewed clients to collect information about their specific needs and problems and provide custom solutions.
- Designed stunning, user-friendly interfaces that matched the clients' goals and caught users' attention.
- Built fast, responsive, interactive, and high conversion rate websites.
- Applied SEO techniques to get high visibility in Google searches.
Technologies: React, JavaScript, HTML5, CSS, Sass, GreenSock Animation Platform (GSAP), Firebase, Next.js, HTML
Experience
Market Store Management
Developed a comprehensive mini-market management software, transforming manual operations into an automated, efficient system with a user-friendly interface.
This software accelerates customer service, boosts sales, and reduces human errors through features like purchase price calculation, product filtering, stock management, and detailed income reports. It includes robust user administration and data backup/restoration capabilities. I played a key role in the app's inception, design, and development, focusing on both front-end and back-end solutions to ensure optimal performance and reusability of components.
This software accelerates customer service, boosts sales, and reduces human errors through features like purchase price calculation, product filtering, stock management, and detailed income reports. It includes robust user administration and data backup/restoration capabilities. I played a key role in the app's inception, design, and development, focusing on both front-end and back-end solutions to ensure optimal performance and reusability of components.
Fe y Alegria Payment Management
Developed the Fe y Alegría payment management system to streamline the institution's student billing and accounts management. This solution facilitates student registration, payment tracking, and debt management, enhancing financial oversight and statistical analysis. I contributed from initial design to deployment, focusing on front-end, back-end, and efficient business logic to ensure optimal performance and component reusability.
Healtcare Medical Date Management
A mobile app built in the middle of the COVID-19 pandemic as a solution to avoid the accumulation of people at hospitals or medical centers by coordinating their medical appointments. The app enables setting a specific day and hour so people wouldn't need to go to the medical center hours before to get and wait for a medical consultation.
I set the Firebase project to use its database and storage and collaborated on the front end, building reusable components with React Native and handling the app's business logic.
I set the Firebase project to use its database and storage and collaborated on the front end, building reusable components with React Native and handling the app's business logic.
Education
2017 - 2021
Engineer's Degree in Computer Science
URBE University - Maracaibo, Zulia, Venezuela
Certifications
FEBRUARY 2022 - PRESENT
MongoDB Course
Platzi
FEBRUARY 2022 - PRESENT
GraphQL Course
Platzi
JANUARY 2022 - PRESENT
Unit Testing Course with Jest in React
Platzi
JANUARY 2022 - PRESENT
TypeScript Fundamentals Course
Platzi
JANUARY 2022 - PRESENT
Next.js Course
Platzi
Skills
Libraries/APIs
React, Node.js, Web3.js, React Router
Tools
Figma, Slack, SendGrid, CircleCI, ChatGPT
Languages
JavaScript, HTML, GraphQL, TypeScript, CSS, UML, Sass, ECMAScript (ES6), HTML5
Frameworks
Redux, Next.js, Jest, Express.js, Electron, React Native, Tailwind CSS
Platforms
Visual Studio Code (VS Code), Software Design Patterns, Firebase, GreenSock Animation Platform (GSAP), Ubuntu, Mapbox
Storage
Databases, MongoDB, MySQL
Other
Programming, Web Development, Data Structures, Algorithms, Windows 10, Discord, Networks, User Interface (UI), Ethers.js, APIs, Bitcoin, Polygon, User Experience (UX), Storybook, Software, GraphQL Code Generator
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