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Senior Back End Developer (Fintech project)

Sigma Software Group
Department:Backend Developer
Type:REMOTE
Region:EU
Location:Poland
Experience:Mid-Senior level
Estimated Salary:€50,000 - €80,000
Skills:
JAVASCRIPTREACTNODE.JSTYPESCRIPTAPISMICROSERVICESDEVOPSCLOUD COMPUTING
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Job Description

Posted on: April 7, 2025

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.

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

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 in building and consuming REST and/or GraphQL APIs
  • Familiarity with DevOps practices
  • Experience working with a Cloud Provider (AWS, GCP, Azure, etc.)
  • Good knowledge of best testing practices
  • At least an Upper-Intermediate level of English

Would be a plus

  • Experience with modern JavaScript and ES6 libraries
  • ​Experience with AWS
Originally posted on LinkedIn

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