Full Stack Engineer with focus on Back-end

SigmaSoftware2

Warsaw, Masovian Voivodeship, Poland Remote permanent

Posted: January 22, 2026

Job Description

Are you passionate about creating impactful web and mobile solutions and excited to work on cutting-edge music technology? We at Sigma Software are looking for a Middle Full Stack Engineer with a strong focus on back-end development to join our team and help shape innovative tools for musicians worldwide.

You can work remotely, onsite in Warsaw, or in a hybrid format — we are flexible to fit your lifestyle. At Sigma Software, you will join a collaborative environment where your expertise will directly influence product performance, usability, and global reach.

Why join us? We offer competitive benefits, a supportive team culture, and the opportunity to work on projects that make a real difference in the music industry.

CUSTOMER

Our Customer is a leading innovator in the music technology industry, dedicated to transforming how musicians interact with sheet music. Their portfolio includes advanced Optical Music Recognition systems and cross-platform applications that enhance music performance and accessibility worldwide.

PROJECT

The project focuses on developing and enhancing a comprehensive sheet music technology ecosystem. This includes cross-platform mobile applications, single-page web applications, and a proprietary Sheet Music Core engine integrated with Optical Music Recognition technology. The goal is to deliver accurate, high-performance, and user-friendly solutions for musicians globally.

• Design, develop, and maintain cross-platform mobile and web applications within the sheet music ecosystem
• Enhance the proprietary Sheet Music Core engine and OMR system to improve accuracy and performance
• Collaborate closely with product managers, designers, and engineers to deliver robust, scalable solutions
• Ensure code quality through reviews, documentation, and adherence to Agile best practices
• Integrate back-end services with front-end applications, ensuring seamless user experiences
• Troubleshoot and resolve technical issues across platforms

• 3–5 years of experience as a Full Stack Engineer, with strong back-end focus
• Proven system design skills for scalable back-end systems
• Solid understanding of SQL/NoSQL databases and data structures
• Experience with RESTful APIs and integrations
• Proficiency in Node.js, Express.js, MongoDB, Firebase (auth)
• Familiarity with Agile/Scrum methodologies
• Ability to work independently and master complex business logic
• Excellent communication skills and experience working with US-based Customers

WILL BE A PLUS

• Mobile app development experience (cross-platform) with CapacitorJS or similar
• Experience with Vue.js and TypeScript
• Knowledge of Apple Developer and Google Play Developer platforms

PERSONAL PROFILE

• Independent and proactive problem solver
• Passionate about learning new technologies
• Strong communication skills and team-oriented mindset
• Committed to delivering high-quality solutions to stakeholders
• Experience in the music domain

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