Senior Backend Engineer - Focus Ninetailed Experience API (f/m/d)

About the Opportunity

Become part of the Ninetailed Team, pioneer of composable personalization and experimentation within the Contentful family.

At Ninetailed by Contentful, you will revolutionize personalization & experimentation for leading businesses worldwide. As a Senior Backend Engineer, you’ll solve complex technical puzzles and challenges to continuously optimize our low latency Experience API, processing billions of requests in real time.

Your work will enable our customers to serve personalized digital user experiences in the most performant way possible.

What to expect?

• Design, develop, and maintain high-performance backend services with a focus on reliability and scalability based on very modern technologies like Cloudflare Workers
• Constantly search for opportunities to improve the system performance and iterate on its architecture
• Solve technical challenges in creative ways, balancing the tradeoff between performance and elegant software architecture
• Continuously monitor and optimize system performance through benchmarking, while making sure the system is well instrumented for observability
• Stay up to date with the latest technologies and constantly evaluate their potential usage at Ninetailed
• Implement defensive coding practices, ensuring systems are resilient and fault-tolerant
• Guarantee correctness and maintainable code through automated testing

What you need to be successful

• Proven experience in building APIs and services that efficiently handle large volumes of traffic.
• Strong proficiency with server-side TypeScript and API protocol design.
• Experience with serverless architectures, ideally edge compute environments such as Cloudflare Workers.
• Familiarity with lower-level languages such as Rust is a plus.
• Familiarity with runtime environments like V8 and experience in optimizing infrastructure and algorithms for performance.
• Hands-on experience with benchmarking, instrumenting code for observability, and performance optimization for large-scale systems.
• Expertise in defensive coding practices, ensuring system robustness and fault tolerance.
• Proficiency in using CI / CD pipelines (e.g., GitHub Actions, GitLab CI) and maintaining automated tests with tools like Jest or Mocha.
• Proactive approach with a high sense of ownership.
• Great communication skills in English, especially when explaining complex technical concepts.

What's in it for You?

• Join an ambitious tech company reshaping the way people build digital experiences
• Full-time employees receive Stock Options for the opportunity to share in the success of our company
• Fertility and family building benefits, including a lifetime reimbursable wallet to support your growing family.
• We value Work-Life balance and You Time! A generous amount of paid time off, including vacation days, sick days, compassion days for loss, education days, and volunteer days
• Company paid parental leave to care for and focus on your growing family
• Use your personal annual education budget to improve your skills and grow in your career
• Enjoy a full range of virtual and in-person events, including workshops, guest speakers, and fun team activities, supporting learning and networking exchange beyond the usual work duties
• An annual wellbeing stipend to care for your physical, financial, or emotional health
• A monthly communication stipend and phone hardware upgrade reimbursement.
• New hire office equipment stipend for hybrid or distributed employees. Get the gear you need to work at your best.

LI-Hybrid #LI-KH1