Senior JavaScript/Node.js Developer, FinTech Project

Sigma Software Group

Node.js expert developing large-scale software solutions for a growing FinTech company in Europe. Leading projects that integrate financial services into their platform, focusing on quality and best practices.

Posted 6/9/2026full-timeRemote • 🇵🇱 PolandSeniorWebsite

Tech Stack

Tools & technologies

AWSGraphQLJavaScriptMicroservicesNode.jsReactTypeScript

About the role

Key responsibilities & impact

Design and implement large-scale software solutions and components using multiple technologies, with a primary focus on Node.js and ReactJS
Maintain a consistently high level of quality throughout all stages of the development
Communicate effectively to collaborate closely with the team and gain full context for complex tasks
Follow the best engineering practices, as well as company and client guidelines
Play supervisory, advisory, and coaching roles for less-experienced engineers on the team
Promote clean code, as well as design patterns and principles

Requirements

What you’ll need

Over 5 years of experience in Back-end software development
At least 3 years of experience with TypeScript
Over 4 years of experience working with Node.js
Practical understanding of MCP architecture and agentic system design
Experience with security aspects of AI Agentic systems and MCP integrations
Strong experience in designing distributed and secure systems
Good Front-end development skills
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
Strong experience working with AWS
Good knowledge of testing best practices
At least an Upper-Intermediate level of English.

Benefits

Comp & perks

🌐 Worldwide ❌ Jobs You've Hidden ⭐️ Saved Jobs ✅ Applied Jobs ✉️ Email Alerts 👤 Account Sigma Software Group Website LinkedIn All Job Openings 1001 - 5000 employees Founded 2002 🎮 Gaming 📡 Telecommunications Software Development
Gaming
Telecommunications Sigma Software Group is a multinational company, established in 2002, that specializes in providing high-quality software development, graphic design, testing, and support services. The company focuses on delivering solutions across various industries such as automotive, telecommunications, aviation, advertising, gaming, banking, real estate, and healthcare. Sigma Software values professional growth, offers remote work opportunities worldwide, and caters to world-renowned clients like AstraZeneca, Scania, and SAS. The company emphasizes a culture of continuous education, mentorship, and flexible work environments, making it a preferred workplace for IT specialists aiming to work on complex solutions utilizing cutting-edge technologies. Sigma Software is committed to innovative solutions and engineering the future while also contributing to social causes such as charitable work in Ukraine. Senior JavaScript/Node.js Developer, FinTech Project 🔥 11 minutes ago 🇵🇱 Poland – Remote ⏰ Full Time 🟠 Senior 🔙 Backend Engineer AWS GraphQL JavaScript Microservices Node.js React TypeScript Apply Now Find Hiring Managers Customize resume + cover letter Report problem ☆ Save ☑️ Mark as applied ❌ Hide 📋 Description
Design and implement large-scale software solutions and components using multiple technologies, with a primary focus on Node.js and ReactJS
Maintain a consistently high level of quality throughout all stages of the development
Communicate effectively to collaborate closely with the team and gain full context for complex tasks
Follow the best engineering practices, as well as company and client guidelines
Play supervisory, advisory, and coaching roles for less-experienced engineers on the team
Promote clean code, as well as design patterns and principles 🎯 Requirements
Over 5 years of experience in Back-end software development
At least 3 years of experience with TypeScript
Over 4 years of experience working with Node.js
Practical understanding of MCP architecture and agentic system design
Experience with security aspects of AI Agentic systems and MCP integrations
Strong experience in designing distributed and secure systems
Good Front-end development skills
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
Strong experience working with AWS
Good knowledge of testing best practices
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Hard Skills & Tools

Node.jsReactJSTypeScriptMCP architectureagentic system designdistributed systemssecure systemsAPIsRESTGraphQL

Soft Skills

communicationcollaborationsupervisoryadvisorycoachingclean code promotionengineering best practices