Hybrid Senior Backend Engineer – Product Growth

at Cloudinary

• Job title: Senior Backend Engineer – Product Growth
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: No Education Requirement
• Tech skills: AWS, Cloud, React, Ruby, Ruby on Rails, TypeScript
• Location requirements: Hybrid, Krakow, Poland

About the role

• Senior Backend Engineer shaping and implementing growth-oriented experiments at Cloudinary. Focusing on backend systems to improve user activation and retention for their platform.

Responsibilities

• Build and maintain backend systems and APIs that power growth experiments across onboarding, activation, and usage.
• Collaborate closely with product, design, and frontend engineers to define, implement, and measure experiments (A/B tests).
• Integrate with existing large-scale Ruby on Rails systems while contributing to performance, scalability, and maintainability.
• Develop and own new backend endpoints supporting personalized onboarding, user profiling, and data-driven experimentation.
• Work autonomously on short iteration cycles, shipping small, impactful improvements frequently.
• Communicate and collaborate across multiple Cloudinary teams to coordinate experimental initiatives.
• Explore and apply modern development tools, including GitHub Copilot, Cursor, and GPT-based assistants, to enhance productivity.
• Participate in shaping how we design and execute growth experiments from both technical and product perspectives.

Requirements

• 5+ years of backend development experience, preferably in Ruby on Rails within large, complex codebases.
• Strong understanding of API design, service architecture, and data modeling.
• Experience working with AWS or similar cloud environments.
• Familiarity with frontend technologies (React, TypeScript) - a plus, not a requirement.
• Comfortable working in a fast-moving environment (Scrumban).
• Excellent communication skills and ability to work independently with minimal instruction.
• Open-minded, curious, and eager to explore new technical areas.
• Strong problem-solving mindset and willingness to take ownership end-to-end.
• Interest in or prior exposure to experimentation platforms (A/B testing, feature flags) - nice to have.
• Enthusiasm for learning and using AI-assisted development tools like Copilot, Cursor, or GPT.

Benefits

• Be part of a trusted, high-ownership team that values autonomy and creativity.
• Hybrid work model - 2 days per week in our Kraków office (ul. Fabryczna 18) with parking available.
• Collaborate closely with team members in Poland and Israel.
• Access to modern tools and opportunities to grow your skills across backend, frontend, and experimentation.
• Work that directly impacts Cloudinary’s business growth and user experience.