Senior Software Developer (Web Development)

SigmaSoftware2

Kyiv, Kyiv city, Ukraine Remote permanent

Posted: March 10, 2026

Job Description

Are you a talented Senior Software Developer ready to make an impact on high-traffic web platforms? This role offers the opportunity to tackle complex technical challenges, shape product architecture, and deliver solutions used worldwide.

We at Sigma Software are looking for a skilled professional to join our Engineering department in Kyiv, Ukraine, with the flexibility to work remotely. You will collaborate with cross-functional teams, drive innovation, and work with modern technologies.

Why join us? You will be part of a company that values technical excellence, creativity, and continuous improvement, offering diverse projects and opportunities for professional growth.

CUSTOMER

Our client is a well-established Ukrainian product company with a strong presence in the global market. Their flagship platform is widely adopted internationally and continues to grow rapidly. Known for delivering high-quality, scalable solutions, the company fosters a culture of innovation and continuous improvement.

PROJECT

The project involves developing and enhancing a high-traffic product website, implementing new features, improving architecture, and enabling rapid experimentation through A/B testing and analytics integrations. You will work closely with product managers and designers to deliver seamless user experiences and scalable solutions.

• Collaborate with cross-functional teams to design, develop, and maintain the product website
• Implement new features and improvements, ensuring high performance and scalability
• Manage releases and run A/B experiments to optimize user experience
• Build systems for rapid iteration of web funnels, including hypothesis testing and analytics
• Integrate with third-party analytics tools such as Amplitude and Customer.io
• Participate in architectural discussions and contribute to technical decision-making
• Mentor junior developers and share best practices within the team

• 5+ years of experience in web application development
• Proficiency in Next.js, TypeScript, and React
• Familiarity with CI/CD pipelines
• Experience integrating third-party services (e.g., Amplitude, Customer.io)
• Strong understanding of high-quality architecture principles
• Business-oriented mindset and creative thinking
• Ability to balance big-picture thinking with attention to detail
• Upper-Intermediate English level

WILL BE A PLUS

• Experience with Firebase
• Experience with Cypress or other testing frameworks
• Experience with Material UI or other UI libraries
• Experience with CI/CD pipelines
• Prior work with analytics integrations

PERSONAL PROFILE

• Proactive problem-solver who thrives in collaborative environments
• Strong technical expertise combined with a business-oriented mindset
• Passionate about modern web technologies
• Able to balance strategic thinking with meticulous attention to detail

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