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

Cornelius

From France (GMT+2)

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Front-end Web DeveloperSenior
Mobile DeveloperSenior
Hire developer
8 years of commercial experience
Art and creativity
Healthcare
Hospitality
Media
Medtech
Real estate
Scientific research
Social media
SaaS
Lemon.io stats

Cornelius – React, React Native, Typescript

Cornelius is an experienced front-end/mobile developer with occasional back-end expertise with a strong engineering approach to development. With over 6 years of hands-on experience in React, React Native, TypeScript, and occasional Node.js back-end tasks, he has contributed to various web and mobile application projects. Additionally, Cornelius has previously provided valuable code reviews for junior developers and holds a Bachelor's degree in Computer Science and Applied Mathematics.

Main technologies
React
6.5 years
React Native
6 years
Typescript
5.5 years
HTML
7 years
Additional skills
Node.js
JavaScript
AWS
Tailwind CSS
Jenkins
Java
Jest
Redux Toolkit
GCP
Storybook
Netlify
MobX
Apollo GraphQL
Rewards and achievements
Mar 24:React/RN/TS - pool
Ready to start
ASAP
Direct hire
Potentially possible

Experience Highlights

Senior Frontend developer
Apr 2024 - Ongoing2 months
Project Overview

Working for a client of Proxify. The project is a real estate web app for owners to be able to handle all the process of evaluating their estate, linking with others entities as photographers, diagnosticians. Managing all their estate via their dashboard with automatic publishing on 40+ platforms . The aim of the app is to have owners handle theirs estate without the need for agencies.

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Responsibilities:
  • Led the development from scratch of a responsive SaaS web platform using React, translating Figma designs into fully functional UI components.
  • Integrated Stripe for seamless payment processing within the application, closely aligning with Figma models and business requirements.
  • Integrated PriceHubble API to leverage real estate data within the platform, enhancing user experience and functionality.
  • Demonstrated proficiency in React state management strategies, specializing in Zustand and React Context for efficient and scalable application state management.
  • Collaborated closely with UI/UX designers, product owners, and backend engineers to ensure seamless integration of designs and functionalities.
  • Defined project architecture, making informed decisions on technology stack and frameworks to optimize performance, scalability, and maintainability.
  • Facilitated effective cross-functional collaboration, ensuring alignment with project goals and customer expectations.
  • Optimized application performance and responsiveness through strategic state management and architecture decisions.
Project Tech stack:
React
Typescript
Tailwind CSS
Zustand
React Query
Formik
Senior React Native Developer
Mar 2023 - Ongoing1 year 2 months
Project Overview

The project is akin to a "Shazam for movies," enabling users to identify films by their audio, currently supporting English movies. Developed in collaboration with partners, the app has been available for download on both the App Store and our website since the beginning of this year.

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Responsibilities:
  • Established front-end architecture and crafted custom components to enhance user experience;
  • Developed a real-time audio recording module and implemented bundle symbolization for streamlined issue tracking on Sentry;
  • Automated end-to-end testing with Detox and integrated captivating animations, optimizing user engagement. Additionally, facilitated seamless update setups using App Center Code Push.
Project Tech stack:
React Native
Typescript
Nest.js
AWS
Sentry
Senior Software Consultant
Dec 2023 - Mar 20243 months
Project Overview

The project involved developing an internal app for a laundry company to streamline operations across multiple locations. Utilizing RFID scanners, the app enables seamless management of processes such as scanning laundry items, adding clients, and introducing new products efficiently.

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Responsibilities:
  • Supported application updates and executed a redesign of the existing front end to enhance user experience;
  • Successfully debugged and resolved application issues, ensuring optimal functionality;
  • Developed two distinct versions of the application, including a staging version for testing and a production version for deployment;
  • Collaborated closely with UI/UX designers and the product owner to ensure seamless integration of designs.
Project Tech stack:
React Native
Android
Java
Senior Full-Stack Developer
May 2021 - Oct 20232 years 5 months
Project Overview

A French digital platform that fosters innovation and scientific collaboration between academia and businesses, backed by government support and funding. Like LinkedIn, it offered features such as regular post feeds, job listings for researchers, collaborative projects, subscription options, and individual or institutional pages. Additionally, the platform facilitated one-to-one and group chats and contract finalization upon mission agreement.

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Responsibilities:
  • Developed a web application messaging system using React with socket.io and Node.js backend, based on AdobeXD designs and Swagger documentation for REST API consumption;
  • Implemented various features and performed maintenance on web and mobile platforms, including posts, pages, notifications, chat, advanced search, login/signup, and landing page;
  • Built and integrated a subscription module with Stripe for payment processing, managed subscriptions, and designed collaborative project announcements with dynamic forms using Formik and Yup;
  • Conducted code reviews and provided feedback to the team.
Project Tech stack:
React
React Native
Formik
Typescript
Node.js
Tailwind CSS
React Hooks
Socket.io
Senior Software Consultant
Jun 2020 - Jan 20217 months
Project Overview

The project involved developing a web application for COVID testing, catering to various entities including clients, laboratories, and event ticketers. Clients could register themselves or their families, select a partner laboratory for testing, and receive a barcode for event entry upon completion.

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Responsibilities:
  • Developed the application according to Figma designs;
  • Integrated graphs using ApexCharts to display testing rates;
  • Utilized Google Maps to provide directions to the nearest partner laboratory for client testing;
  • Implemented barcode scanning and functionality;
  • Created custom form components using Formik and Yup;
  • Followed Agile methodologies, conducting code reviews for each pull request before merging;
  • Utilized Jest and RTL utilities for Test-Driven Development (TDD).
Project Tech stack:
React
Typescript
Material UI
Redux Toolkit
Google Map API
Senior Software Consultant
Dec 2019 - Mar 20202 months
Project Overview

The project focused on developing native apps for the AutoCare network using React Native for Android and iOS platforms. These apps cater to merchants and clients within the car wash sector, providing clients with functionalities to wash their cars, locate nearby stations via maps, and manage vouchers seamlessly.

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Responsibilities:
  • Developed both merchant and client applications based on Figma designs;
  • Integrated Google Maps functionality to locate nearest stations;
  • Implemented push notifications using Firebase;
  • Followed Agile methodologies, including code reviews and pull request evaluations before merging;
  • Incorporated Google and Apple authentication via Firebase;
  • Utilized Redux Toolkit, React Hooks, functional components, Jest, and RTL utilities for Test-Driven Development (TDD);
  • Collaborated closely with UI/UX designers to ensure smooth design integration;
  • Employed performance optimization techniques to improve application speed and responsiveness;
  • Conducted thorough code reviews, offering constructive feedback for continuous improvement.
Project Tech stack:
React Native
React Hooks
Formik
Firebase
Typescript
Redux Toolkit
Jest

Education

2021
Computer Science and Applied Mathematics
Bachelor's

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