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Senior Fullstack Engineer - Focus SDKs (f/m/d)

ContentfulBerlin, GermanyOnsite
This job is no longer open

About the Opportunity


Become part of the Ninetailed Team, pioneer of composable personalization and experimentation within the Contentful family.Join Ninetailed by Contentful as a Senior Fullstack Engineer and shape the future of how digital personalized user experiences are being built at scale. You’ll play a key role in developing SDKs and tools that empower developers to seamlessly integrate our platform. Your work will directly impact the developer experience for major companies around the world.

What to expect? 


  • Develop and maintain SDKs and tools that are both high-performing and enjoyable for developers to use.
  • Own the strategic future of the Ninetailed SDKs and its architecture.
  • Collaborate closely with API teams to implement efficient protocols to exchange events and render dynamic experiences in the most performant way possible.
  • Ensure stability & reliability through a great suite of unit and e2e tests
  • Make the life of your peers and external users joyful by creating strong documentation.
  • Manage the release process for public packages using semantic versioning, ensuring smooth transitions and upgrades for developers.
  • Optimize for performance by focusing on reducing bundle sizes and improving load times.
  • Work with external engineers on different flavors of our SDKs to enable customers to use Ninetailed with mobile platforms.

What you need to be successful


  • Proven experience building developer-facing tools, libraries, or open-source projects.
  • Strong experience with TypeScript, including deep understanding of its type system.
  • Proficient in using React and some of its higher level frameworks (e.g. Next.js, Remix, Astro etc.)  and other similar libraries (e.g. Vue, Angular, Svelte, Nuxt.js) for front-end development.
  • Hands-on experience with modern bundlers such as Rollup, Vite, etc.
  • Solid background in automated testing, including both unit and e2e tests, using frameworks like Jest & Playwright.
  • Experience working with Web APIs and ensuring browser compatibility.
  • Experience in optimizing for bundle size and load time.
  • Familiarity with semantic versioning for managing public package releases.
  • Experience with Monorepos for handling multiple packages, ideally nx.dev is a plus.
  • Knowledge in mobile development (e.g. React Native) is great to have.
  • Strong collaborative mindset with experience working cross-functionally.
  • 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,compassion days for loss, education days, and volunteer days
  • 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

Who are we?


Contentful is the intelligent composable content platform that unlocks all of an organization’s digital content to deliver impactful customer experiences, making content a strategic business asset. The Contentful Platform, Contentful Studio, and the Contentful Ecosystem combine the flexibility of composable content with the intelligence of AI, empowering digital teams to drive business momentum through collaboration, speed, and scale. Contentful powers innovative content experiences across brands, regions, and channels for organizations around the world, including nearly 30% of the Fortune 500.

Nearly 800 people from more than 70 nations contribute their energy and creativity to Contentful, working from hubs in Berlin, Denver and distributed around the world.

Everyone is welcome here!


“Everyone is welcome here” is a celebrated component of our culture. At Contentful, we strive to create an inclusive environment that empowers our employees. We believe that our products and services benefit from our diverse backgrounds and experiences and are proud to be an equal opportunity employer. All qualified applications will receive consideration for employment without regard to race, color, national origin, religion, sexual orientation, gender, gender identity, age, physical [dis]ability, or length of time spent unemployed.

We invite you to apply and join us!If you need reasonable accommodations at any point during the application or interview process, please let your recruiting coordinator know.Please be aware of scammers who may fraudulently allege to be from Contentful. These types of fraud can be carried out through copycat websites, fake email addresses claiming to be from our company, or social media. We do not ask for your personal information such as bank account numbers, identification numbers, etc through social media or chat-based apps, nor do we request or send money for the purchase of business equipment.

If you suspect fraud, please report it to your local authorities, as well as reaching out to us at security-esk@contentful.comwith any information you may have.By clicking “Apply for this job,” I acknowledge that I have read the “Contentful’s Candidate Privacy Notice”, and hereby consent to the collection, processing, use, and storage of my personal information as described therein.

This job is no longer open

Life at Contentful

Contentful powers digital experiences for major brands around the globe. Our content infrastructure provides a powerful set of APIs to manage, integrate and deliver content to any device or service. Developers and content creators can build digital products and edit content in parallel, enabling teams to ship faster. Our team includes more than 200 people from 45 nations, with offices in Berlin and San Francisco. Come work with us.
Thrive Here & What We Value- Ownership Opportunity (Stock Options)- Comprehensive Healthcare Package (Health, Dental, Vision Care Coverage)- Work-Life Balance Emphasis (Paid Time Off Policy)- Learning & Networking Opportunities (Professional Development Activities)- Physical Wellness Support (Remote/Office Gym Equipment Budget)- New Hire Equipment Stipend (Work-Related Equipment Assistance)- Monthly Phone/Internet Upgrade & Reimbursement (After Two Years Eligibility)- Employee Assistance Program (Counseling and Resources Access)- Personal Education Budget (Online Courses or Certifications)- Inclusive Work Environment (Diversity and Inclusion Practices)

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