Mid Backend Engineer (BFF/Kotlin/Java/Spring)

About the Role

As a Backend Engineer (BFF) at Bilue you will take ownership of the BackendforFrontend (BFF) layer that powers our clients mobile applications. Youll be responsible for developing and maintaining backend services tailored specifically to the needs of mobile frontends with a focus on performance usability and scalability.

This role is ideal for someone with solid experience in Kotlin (or Java with a willingness to transition) and a good understanding of Spring Boot. Familiarity with the ServerDriven UI pattern is a strong plus.

Key Responsibilities

• Design build and maintain BFF services that serve our mobile apps with optimised tailored APIs
• Collaborate closely with mobile engineers designers and product managers to deliver seamless user experiences
• Use Kotlin (preferred) or Java with Spring Boot to develop scalable backend services
• Implement and maintain patterns for feature toggles A/B testing and dynamic UI rendering via serverdriven approaches
• Ensure strong API versioning documentation and backward compatibility for mobile consumption
• Write clean testable and welldocumented code that follows best practices
• Identify bottlenecks debug performance issues and propose reliable solutions
• Contribute to discussions on API design system architecture and scalability

Qualifications :

About You

Youre a backend engineer with a passion for building backend systems that power rich mobile experiences. Youre excited about collaboration scalable systems and highquality APIs. Youre proactive technically curious and enjoy working in a fastmoving crossfunctional team.

• 35 years of experience in backend development with Kotlin (preferred) or Java
• Strong experience with Spring Boot and RESTful API development
• Understanding of mobile app requirements and the role of BFFs in supporting crossplatform experiences
• Familiarity with CI/CD tools and modern development workflows (Git GitHub/GitLab Jenkins etc.)
• Solid understanding of API security caching strategies and data serialisation formats (JSON Protobuf)
• Excellent collaboration and communication skills with experience working in agile teams

Bonus Points For

• Experience with ServerDriven UI patterns and dynamic UI delivery
• Exposure to GraphQL or similar querydriven API designs
• Familiarity with feature flags remote configuration tools or A/B testing platforms
• Knowledge of mobile development (Android or iOS) and how mobile apps consume APIs
• Experience with containerization (Docker) orchestration (Kubernetes) and cloud platforms (AWS GCP Azure)

Additional Information :

Life at Bilue

• Clientfocused: We are dedicated to delivering exceptional value to our clients while supporting each other to achieve collective success.
• Flexible work: We offer 12 days per week in the office balancing flexibility with the expectation that youll go the extra mile for our clients when needed.
• Professional development: Were committed to your personal and professional growth offering continuous learning through Go1 (which provides unlimited access to a wide range of courses) along with support from our dedicated internal performance coach.
• Annual events: We organise annual events to foster inperson connection and team collaboration.
• Flat structure: We operate with a flat structure where our casual approachable executive leadership team (ELT) ensures everyones voice is heard.
• Internal communities: We build and nurture internal communities for knowledge sharing and collaboration keeping everyone connected and informed.

Bilue Big Blue Ocean. Are you ready to set sail Apply now!

NB. This is a fulltime position based in Sydney. To be considered candidates must have unrestricted working rights in Australia.

We believe that having balanced and diverse teams is fundamental to our success. We welcome applicants of all backgrounds and experiences and are committed to fostering an inclusive environment where everyone feels respected and valued. We do not discriminate based on race religion national origin gender identity or expression age sexual orientation marital status neurodiversity or disability status. 

We are a 2024 Circle Back Initiative Employer we commit to respond to every applicant.

Remote Work :

No

Employment Type :

Fulltime