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Senior Backend/Fullstack Engineer

Location: Auckland, New Zealand

We're on the lookout for a versatile Backend Developer with hands-on experience in Java, Kotlin, and fullstack web application development, particularly using React. The ideal candidate will help us engineer top-notch backend services while also contributing to our frontend web applications.

Here’s what we’re looking for you to tackle:

Development & Architecture:

  • Design, develop, and maintain robust and scalable backend systems using Java and Kotlin.
  • Implement, optimise, and maintain APIs for our web and mobile platforms.
  • Keep up-to-date with the latest industry trends, best practices, and emerging technologies in frontend development.

Fullstack & Frontend Development:

  • Develop and optimize web applications using React and other modern web technologies.
  • Collaborate with designers to implement user-friendly and visually appealing interfaces.
  • Ensure seamless integration between the frontend and backend systems.



  • Minimum of 3 years of backend development experience with Java/Kotlin.
  • Proven experience developing web applications using React.
  • Demonstrable fullstack development capabilities.

Skills & Knowledge:

  • Strong knowledge of object-oriented programming, design patterns, and software development best practices.
  • Deep understanding of database design, optimisation, and management.
  • Proficiency with RESTful API design and development.
  • Proficiency in modern frontend development, including CSS preprocessors, state management, and bundling tools.


  • Bachelor's/Master's degree in Computer Science, Information Technology, or related fields (or equivalent experience).

You’ll be resilient + up for a challenge - you enjoy hard work and the thrill of chasing a massive target. Friends would say you're honest, capable and a natural high-achiever... While being down to earth.

You love your work and understand that it's also meant to be fun. You’re mature enough to deal with a high-trust environment and lots of autonomy. You're probably looking for more than just a job - and you may even be looking for a once-in-a-lifetime opportunity...


SquareOne has big plans. Since launching 18 months ago with our debut product, we’ve onboarded more than 150,000 customers and added a wide range of capabilities around cards and banking. We only work with the best of the best, so you’ll be dealing closely with Mastercard, ANZ, Windcave & other partners.

We offer a challenging, fun and massively rewarding environment, with an exciting 5 year vision and an awesome, high performing team. You’ll also gain (if you choose) exposure to all areas of the business, and an opportunity to learn a huge amount as we grow.

If this sounds like you, send your cover letter and CV to: