Staff Software Engineer w Kraków, Polska

About Our Client On behalf of our Client - a highly profitable, US-headquartered scale-up in the Cybersecurity and Threat Prevention space—we are seeking an experienced Staff Software Engineer. Our Client builds real-time platform security solutions that protect global digital platforms from fraud, account abuse, and automated attacks. Operating at massive scale, their architecture processes high-throughput API traffic under stringent low-latency requirements. They combine deep backend scalability engineering with a heavy emphasis on intuitive product UI/UX and developer-first design. Location & Work Setup 100% Remote (requiring working overlap between UTC-5 and UTC+1 time zones). Hybrid Option: Access to a modern tech hub in Krakow, Poland if you prefer working from an office. Key Responsibilities Product Development: Architect and deliver end-to-end features using a tech stack centered on Ruby on Rails, Angular, and AWS. High-Throughput APIs: Design and optimize public-facing APIs with a focus on developer ergonomics, efficiency, and reliability. Engineering Standards: Drive continuous quality through thorough code reviews, architectural discussions, and technical mentoring. Product Impact: Work in an autonomous, streamlined engineering team where your technical decisions directly shape the platform's trajectory. Candidate Profile 6+ years of commercial software development experience, ideally within SaaS, fintech, or high-growth product companies. Backend Proficiency: Strong experience with Ruby on Rails (or deep expertise in https://jobeax.com/link/JSd7UYCSg572jJDY with a fast learning agility to transition into a Ruby environment). API Ecosystems: Proven track record of shipping scale-ready, public-facing APIs optimized for developer consumption. Communication: C1+ fluent written and spoken English for daily collaboration in a distributed team. Work Culture High Autonomy: Strong emphasis on complete project ownership from concept to production release. Pragmatic & Modern: Openness to experiment, iterate, and leverage automation and modern AI tools to eliminate toil. What Is Offered Compensation: ~$150,000 – $205,000 USD / year (B2B Contract). Time Off: Unlimited PTO policy + flexible working hours focused on delivered outcomes. Benefits: Paid parental leave policy. Equipment: Full high-spec hardware setup (laptop + workstation gear).