Senior React/Node.js Developer (FinTech Project)

JavaScript

Emilii Plater 53, Warszawa+4 Locations

Sigma Software

Full-time

B2B

Senior

Remote

Tech stack

English

B2

AWS

advanced

Node.js

advanced

Redux

advanced

React

advanced

GraphQL

advanced

Testing

regular

Job description

We invite a highly skilled JavaScript expert with extensive experience in React and Node.js, who excels as a collaborative team member.

The role extends beyond coding, encompassing responsibilities such as handling feature aspects, specifications, technical design, development, testing, documentation, and maintenance.

Customer:

Our client has rapidly become one of Europe’s most swiftly expanding FinTech companies. They oversee all aspects of financial operations, from generating virtual cards to facilitating wire transfers and maintaining customer account balances. As a payment institution, our client provides a platform that integrates financial services into its product, offering features such as account management, card payments, bank transfers, and additional services.

Requirements:

• Over 5 years of experience in Back-end software development

• At least 3 years of experience with TypeScript

• Over 3 years of experience working with Node.js, React, and Redux on large-scale applications

• Strong experience in designing distributed and secure systems

• Good understanding of microservices architectures

• Experience in designing, building, and maintaining APIs

• Experience of building and consuming REST and/or GraphQL APIs

• Familiarity with DevOps practices

• Strong experience of working with AWS

• Good knowledge of testing best practices

• At least an Upper-Intermediate level of English

Would be a plus:

• Experience with modern JavaScript and ES6 libraries

Responsibilities:

• Design and implement large-scale software solutions and components using multiple technologies, with a primary focus on React and Node.js

• Keep consistently high level of quality throughout all stages of the development

• Communicate effectively to actively collaborate with the team and get context for complex tasks

• Follow best engineering practices and company and client guidelines

• Play supervisory, advisory, and coaching roles for less-experienced engineers on the team

• Promote clean code and design patterns and principles

Published: 24.08.2025

Meet the company

Sigma Software

Sigma Software is a global software development company that enables enterprises, startups, and product houses to meet their technology needs through end-to-end delivery. We have been working since 2002, from all over the world.

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