Senior JavaScript Full Stack Developer with AI

SigmaSoftware2

Kraków, Lesser Poland Voivodeship, Poland Remote permanent

Posted: March 18, 2026

Required Skills

Job Description

Are you passionate about building sophisticated enterprise solutions and working with cutting-edge AI tools? We at Sigma Software are looking for a Senior Full Stack Developer to join our internal HRMS/ERP project team. This role offers flexibility for Back-end specialists willing to contribute to Front-end development. 

You will work remotely, collaborating with a highly skilled team across Ukraine and Europe. At Sigma Software, we value innovation, professional growth, and delivering top-quality solutions. Joining us means access to continuous learning, challenging projects, and a supportive environment. 

This is an internal Sigma Software initiative, developed and maintained by our engineering teams. The solution is designed to optimize business processes, streamline operations, and enhance employee engagement across the company. 

PROJECT

Our HRMS/ERP system is a comprehensive platform integrating automation, cloud infrastructure, and advanced AI tools to improve operational efficiency. The project involves complex integrations, scalable architecture, and modern development practices. 

• Design, implement, and debug software modules, components, and complete systems of small to medium complexity 
• Develop unit, integration, and automated end-to-end tests 
• Perform thorough self-testing of code, covering key scenarios and edge cases before marking tasks as complete 
• Follow best engineering practices aligned with company SDLC and guidelines 
• Mentor junior specialists, providing guidance and conducting peer reviews to ensure quality delivery 
• Participate in requirements clarification sessions, proactively raising questions and ensuring readiness for implementation 
• Conduct peer reviews with middle and senior specialists, actively requesting feedback 
• Contribute to estimation and planning sessions 
• Act as feature leader when applicable, overseeing delivery from requirements gathering to defect resolution 
• Prepare technical and user documentation 
• Track task progress against estimates and schedules, proactively flagging risks 
• Participate in project and team meetings, providing relevant updates 
• Support build and deployment automation where applicable 
• Continuously develop skills and qualifications, aiming for advancement to Senior role 
• Attend training courses, seminars, and conferences 
• Join customer meetings, both virtual and in-person 

• 5+ years of experience with TypeScript and JavaScript 
• Back-end: 5+ years of experience with Node.js; experience with NestJS 
• Experience with AI tools: Cursor, Claude Code 
• Databases: MySQL (Relational), Redis (Document-based) 
• Optional Front-end: React JS, TypeScript, JavaScript 
• DevOps: General understanding of CI/CD practices 
• Cloud: Experience with Azure and/or AWS 
• English: Upper-Intermediate level 

WILL BE A PLUS 

• Process automation experience 
• Business process modeling skills 
• ERP systems experience 
• Familiarity with Scrum frameworks 

PERSONAL PROFILE

• Proactive communication 
• Adaptability in fast-paced environments 
• Attention to detail 
• Interest in working with AI tools 

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