Logo
Yaroslav – React Native, Node.js, Typescript, experts in Lemon.io

Yaroslav

From Ukraine (GMT+3)

flag
Full-stack Web DeveloperSenior
Mobile DeveloperSenior
Hire developer
8 years of commercial experience
Automotive
Data analytics
Environmental services
Environmental studies
Job and career services
Machine learning
Retail
Tourism
Transportation
AI software
CRM
Mobile apps
Lemon.io stats

Yaroslav – React Native, Node.js, Typescript

Yaroslav is a Senior Full-stack and Mobile Developer with over 8 years of commercial experience. He has extensive expertise in JavaScript and Python, along with solid practical skills in TypeScript and various back-end architectures. Yaroslav demonstrates exceptional knowledge of React.js and React Native, with hands-on experience in mobile development. He is proficient in database management systems like PostgreSQL and MySQL. Yaroslav is adept at problem-solving and can effectively navigate complex systems. He is recommended for roles as a Senior Mobile Developer, Senior Front-end, and Senior Back-end Engineer, capable of taking on project responsibilities as an individual contributor or team leader.

Main technologies
React Native
2 years
Node.js
4 years
Typescript
6 years
React
4 years
Next.js
4 years
Python
3 years
Django
3 years
Additional skills
AWS
JavaScript
Jest
GPT
OpenAI API
Microsoft Azure
Django REST
Nest.js
Cypress
Web Components
GitLab CI/CD
OpenAI
Vercel
Tailwind CSS
Docker
FastAPI
Webflow
Expo
Firebase
PostgreSQL
Terraform
Flask
GCP
Ready to start
ASAP
Direct hire
Potentially possible

Experience Highlights

Senior Full-stack Developer
Feb 2023 - Ongoing1 year 3 months
Project Overview

The company is one of the world’s leading leisure travel groups, with over 220 trusted brands in 180 countries and more than 30 million customers. It fully or partially owns several travel agencies, hotel chains, cruise lines, and retail shops as well as five European airlines.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Created and maintained web applications based on Microfrontend architecture pattern;
  • Performed technical assessment of mockups/wireframes and architectural designs/specifications to ensure the possibility of their implementation;
  • Extended and optimized existing Gitlab CI/CD pipelines;
  • Defined and resolved complex domain-specific dependencies by communication with different company departments.
Project Tech stack:
Web Components
AWS
Node.js
Stencil.js
Preact
GitLab CI
CD
Typescript
Jest
Vite
Kanban
Senior Mobile Developer
Dec 2023 - Apr 20243 months
Project Overview

An iOS and Android app that helps with planning, conducting, and reviewing environmental research. Freelancers receive notifications about all platform updates and when they need to take action.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Independently developed the application;
  • Implemented the application based on provided Figma wireframes and designs;
  • Provided feedback to designers by reviewing and assessing app design;
  • Configured CI/CD pipelines for updating and building the application;
  • Successfully published the application to both AppStore and PlayStore platforms.
Project Tech stack:
React Native
Expo
REST API
React Hook Form
Firebase
React Query
MapBox
Senior Full-stack Developer (Generative AI)
Jan 2023 - Mar 20231 month
Project Overview

Enterprise ChatGPT, the privacy and security-focused ChatGPT & Bard alternative.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Built private enterprise chat GPT clone that uses Azure OpenAI;
  • Created custom chat GPT that uses data from private confluence space
  • Developed Python API that generates an answer for the chat GPT based on an in-context learning approach;
  • Deployed Python API to Microsoft Azure and protected a web app with Azure AD authorization.
Project Tech stack:
Next.js
Tailwind CSS
Vercel
Python
FastAPI
Microsoft Azure
GPT
OpenAI
Docker
Senior Full-stack Developer
Oct 2022 - Jan 20233 months
Project Overview

This is an ecological consultancy firm from the Netherlands that specializes in species inventories, ecological quick scans, and ecological guidance. They needed to build a platform for planning work for a season, taking into account a huge amount of conditions: from available research to sunrise.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Created Front-end architecture and established development process;
  • Developed private portal;
  • Wrote unit and e2e tests using Jest and Cypress;
  • Led a team of 5 Front-end developers;
  • Build React Native mobile app for research (not published to AppStore yet);
  • Integrated with complex ArcGIS map API: export/import of map points and polygons.
Project Tech stack:
React
React Native
Material UI
Python
Django REST
React Hook Form
React Query
AWS
Docker
Expo
MapBox
Senior Full-stack Developer / Team Lead
Jun 2022 - Sep 20223 months
Project Overview

The company operates a platform where IT professionals can explore job opportunities while remaining anonymous. Candidates create profiles and allow companies to contact them without revealing their identities. Currently, the platform is suspended.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Designed web app architecture and decided on tools and technologies to be used on the project;
  • Developed complex Full-stack features;
  • Wrote unit and e2e tests using Jest and Cypress;
  • Led a team of 5 Front-end developers: helped to understand requirements, planned features architecture and development, code reviews, and personal growth;
  • Worked closely with the designer and PO to build the most convenient UI with less development time to fit the project budget.
Project Tech stack:
Next.js
React
React Hook Form
React Query
Material UI
AWS
Docker
Python
Django REST
Webflow
Senior Front-end/Mobile Developer
Apr 2022 - Jun 20222 months
Project Overview

This is a start-up in the Netherlands that offers electric and luxury shared cars and intends to expand its products to scooters, bikes, and boats. They needed to build a mobile app where users could access their car rental services. The app was removed from AppStore as the company decided to close the stand-up.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Created technical solutions for the project based on requirements;
  • Built mobile app architecture;
  • Developed React Native app using NativeBase UI library;
  • Led a team of 2 mobile developers;
  • Published mobile app to the AppStore.
Project Tech stack:
React Native
React Hook Form
React Query
REST API
Firebase
Typescript
Expo

Education

2018
Software Engineer
Master of Science

Copyright © 2024 lemon.io. All rights reserved.