The Senior Backend Engineer will develop and maintain backend systems and APIs for growth experiments, collaborate cross-functionally, and leverage modern development tools to enhance productivity.
About the role
The Product Growth team drives Cloudinary’s self-serve success by crafting seamless, scalable platform experiences that help users discover more value, activate faster, and grow their usage over time.
As a Senior Backend Engineer, you’ll play a key role in shaping and implementing growth-oriented experiments - from fine-tuning onboarding and registration flows to improving user activation and retention. Unlike core product teams, we focus on the connective tissue of the platform - the touchpoints that influence how users experience and adopt Cloudinary.
You’ll join a small, cross-functional team of frontend engineers, a designer, a product lead, and a quality engineer. Together, we move fast, iterate often, and measure our impact directly through user behavior and business growth.
Team lead insights
I’m looking for a strong backend engineer who loves solving challenges and experimenting. Someone who enjoys working in a fast-paced environment where ideas turn into reality quickly. In our team, trust and ownership are key - I value people who take initiative, share their thoughts openly, and aren’t afraid to explore new directions. You’ll work with an amazing, tight-knit group that’s passionate about growth and impact.
What You’ll Do?
- 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.
What We’re Looking For:
- 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.
Why Join Us?
- 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.
#LI-SL1
Top Skills
AWS
Cursor
Github Copilot
Gpt-Based Assistants
Ruby On Rails
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