The Role
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.
Summary Generated by Built In
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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The Company
What We Do
Cloudinary’s mission is to empower companies to deliver visual experiences that inspire and connect by unleashing the full potential of their media. With more than 50 billion assets under management and 7,500 customers worldwide, Cloudinary is the industry standard for developers, creators and marketers looking to upload, store, transform, manage, and deliver images and videos online. As a result, leading brands like Atlassian, Bleacher Report, Grubhub, Hinge, NBC, Mediavine, Peloton, Petco and Under Armour are seeing significant business value in using Cloudinary, including faster time to market, higher user satisfaction, and increased engagement and conversions. For more information, visit www.cloudinary.com.
