🇵🇱Poland, Warsaw (UTC+02:00)
🇺🇦Ukraine, Kyiv (UTC+02:00)
Last Update Last Updated: March, 2026
$5,000/month

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Expert Javascript (React) Engineer

Front-End Web.

Expert
B2 (Upper-Intermediate)

Required Skills

React
React
5.0 yr.
JavaScript
JavaScript
5.0 yr.

Nice to Have

TypeScript
TypeScript
HTML/CSS Preprocessors
SASS
SASS
LESS
LESS
Styled components
Bootstrap
Bootstrap
Foundation
Gitflow
Jest
Jest
Mocha
Jasmine
Jasmine
Payment
DBA
Responsive
UI
Web Applications
Agile
Agile
CSS
CSS
Preprocessors
Responsive Design
Git
Git
API
API

Summary

• We have a new urgent vacancy of an Expert JavaScript / React Engineer
• Direct Hire model of cooperation!
• Client is a Payment processing and provider platform
• Location: Europe - Poland, Ukraine (we look at Kyiv, Zhytomyr, Vinnytsia, Khmelnytskyi, Chernivtsi, Ternopil, Rivne, Zakarpattia, Ivano-Frankivsk, Lviv, Volyn regions), Spain, UK, Bulgaria.
• Duration: a 3-month project, but with good chances to turn into a permanent engagement
• PE (FOP 3 group) is needed
• Start: ASAP
• English: Upper-Intermediate and higher.

Are you a talented developer looking for a remote job that lets you show your skills and get decent compensation? Join Upstaff.com, a platform that connects you with hand-picked startups and scale-ups in the US and Europe.

Ridect Hiring Model (No Subcontract)

About the client

A fast-growing, profitable, well-funded and dynamic global payments company. Its offices are located in Israel, New York and more. It is serving thousands of corporates and millions of end-users (payment receivers), in 190+ countries

R&D organization holds almost 500 workers (Developers,Automation QA, DBA, IT, Professional services / production support). R&D teams are operating in SCRUM methodology, with product managers involved in each team.

Client systems are based on Microsoft and open-source technologies serving both international WEB users and the Company internal users.

R&D is looking to extend its capacity for new-developments and existing product enhancements, in high quality and fast pace of delivery.

With client’s fast, flexible, secure and low-cost solutions, businesses and professionals in both developed and emerging markets can now pay and get paid globally as easily as they do locally.

About the role

As an Expert React Engineer, become a part of a cross-functional development team, engineering experiences of tomorrow. The client ecosystem domain is responsible, among other things, for the integration of partnerships (3rd party solutions).

Responsibilities

  • Collaborate with designers and developers to build responsive and user-friendly interfaces.
  • Implement and maintain UI components using React.
  • Write clean, efficient, and testable code under the guidance of more experienced colleagues.
  • Troubleshoot and debug issues in web applications.
  • Contribute to improving the usability and performance of our products.
  • Front-end development to meet customer’s business needs and implement components according to modern software development environment with acceptable quality and supervision;
  • Taking part in the decision-making process in design application architecture, solution development, architecture and code review;
  • Describing own code within technical documents and simple diagrams and provide inputs/update to specifications for the solution;
  • Writing automated tests;
  • Proactive position in solution development, processes improvements;
  • Working in an international distributed team in an Agile environment;
  • Following best practices and defined standards for implementing the web application
  • Investigate and fix application bugs

Requirements

  • Experience in Front End development for more than 5 years, including recent experience in React
  • Translate business needs into technical solutions and make decisions when building software (business-oriented);
  • Proficiency in JavaScript/TypeScript, including knowledge of asynchronous

programming.

  • Experience with modern JavaScript frameworks/libraries
  • Understanding of server-side technologies
  • Familiarity with CSS preprocessors (like SASS or LESS.) or modern styling techniques (e.g., StyledComponents).
  • Understanding of responsive design and frameworks like Bootstrap or Foundation.
  • Proficiency in Git and workflows (e.g., GitFlow).
  • Ability to handle asynchronous operations
  • Knowledge of front-end testing frameworks such as Jest, Mocha, or Jasmine.
  • Understanding of best practices for optimizing front-end performance.
  • Familiarity with tools for monitoring and improving performance
  • Experience working in an Agile environment.
  • Excellent communication skills and a willingness to learn.

Can be a plus

  • Experience with financial apps
  • API integration
  • Stable coins

Personal skills

  • Investigate issues.
  • Able to work in distributed cross-functional teams effectively.
  • Plan, schedule and monitor your own work.
  • Have learning agility (readiness for challenge and being open to change).

Vetting and Interview Process

Hackerrank Test -> Interla Technical Interview -> 1-2 Client Interviews.

How to Apply for Expert Javascript (React) Engineer

Be ready for the next steps:

  • Create your profile on our website (import from LinkedIn)
  • 20-30-minute screening call
  • Technical interview feedback
  • Project Selection (we are looking for the best project for you).

Who can apply:

  • We work with developers across Europe, LATAM, the U.S. (W-9 form owners), Canada, Asia, Oceania, and the UK.
  • We do not provide visa assistance, and this cooperation model does not include direct-hire benefits.
  • We cannot accept applicants from Russia, Belarus, Iran, or North Korea.
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