Staff Software Engineer

At Upside, we're partnering with ambitious companies across the globe to solve complex, meaningful problems through technology. We work in focused teams, combining engineering, product thinking, and design, to deliver outcomes, not just output.

Requirements

• Extensive commercial experience in building web-based applications (+7 years)
• Solid expertise in at least one of the following frameworks: Python, Ruby, JavaScript
• Proven ability to design and oversee complex architectures
• Strong understanding of databases (PostgreSQL preferred) and performance optimization at scale
• Experience in cloud-native environments and CI/CD practices
• Excellent consulting skills
• Demonstrated ability to mentor engineers, provide constructive feedback, and foster technical growth
• Fluent English (clear written and verbal communication)

Benefits

• Transparent progression path
• Flexible work: office in Kraków, hybrid or remote from anywhere in Poland, with company on-sites
• Additional paid days off beyond national holidays
• A deeply collaborative, engineering-led company culture
• Support for ongoing learning