Senior Backend Engineer; Java

£75,

Benifex is a fast‑moving technology company and one of the most successful providers of online reward and benefits solutions. We build workplace technology that creates exceptional employee experiences. Our mission is to build remarkable experiences that employees love. Today, Benifex supports more than five million employees in over 3,000 organisations across more than 100 countries.

• Impact: work on a product suite used by millions of people that improves employee experience and wellbeing.
• Scale: build features and services to support our 5 million+ customers globally.
• Autonomy: influence the product roadmap and technically lead features and services.
• Development: ensure a seamless experience across One Hub.
• Recognition:
  Top 10 Employer, Sunday Times Best Places to Work Award recipient.
• Work for a profitable, fast‑growing market leader in the online reward and benefits space.

• Tech setup of your choice (Mac Book Pro or equivalent, monitors, etc.)
• £/€800 annual learning budget, plus two hours per week as ‘Focus Fridays’.
• Flexible work – choose a working setup that works for you; we ask you to visit our UK HQ once a quarter.
• 25 days holiday plus local bank holidays.
• Birthday off.
• Two half‑day wellbeing days.
• Healthcare cash plan covering day‑to‑day costs.
• Employee Assistance Plan 24/7/365 support.
• Income protection (75 %) and life assurance (4× salary).
• Pension scheme.
• Enhanced parental leave: 26 weeks fully paid maternity leave and 4 weeks fully paid paternity leave.
• £50 monthly allowance with a dedicated Benifex card.

We are looking for a skilled Senior Backend Engineer to evolve our Unified Profile service—the central source of truth for user identities, preferences, and cross‑product data. You will design and build robust, API‑driven, event‑oriented services that power a seamless, consistent experience across multiple products. If you are passionate about clean APIs, data modelling, event‑driven architecture, and setting architectural direction, this role places you at the heart of the platform.

Java, Spring Boot, REST APIs, Mongo

DB, Golang, Docker, Kubernetes, GCP.

• Design, build, and maintain high‑quality REST APIs and backend services using Java and Spring Boot.
• Implement and evolve event‑driven workflows using Google Cloud Pub/Sub to synchronise profile data across multiple products.
• Ensure the Unified Profile remains a reliable, scalable, and accurate source of truth for user identity and profile attributes.
• Improve performance, reliability, and observability of the service (logging, metrics, tracing, alerting).

• Work closely with the Principal Engineer to influence future architecture of profile management, data contracts, and event schemas.
• Contribute to the design and evolution of domain events, ensuring schema consistency, forward compatibility, and good modelling practices.
• Drive engineering standards across the squad, including testing strategy, CI/CD improvements, and code quality practices.

• Collaborate with product teams to integrate Unified Profile into their services and support shared use cases.
• Partner with Platform, Data Engineering and Security teams to ensure APIs, events, and data flows are compliant, secure, and well‑governed.
• Work with frontend and mobile engineers to define clear, well‑documented APIs (OpenAPI/Swagger).

• Provide technical mentorship to engineers in the team, supporting growth, knowledge sharing, and sound engineering practice.
• Participate in architectural discussions, design reviews, and incident retrospectives, bringing strong backend expertise.

• Strong experience building high‑performance backend systems with Java and Spring Boot.
• Solid understanding of event‑driven architecture and distributed system principles.
• Practical experience with messaging systems such as Google Cloud Pub/Sub, Rabbit
  
  MQ or similar.
• Experience working with No
  
  SQL databases, ideally Mongo
  
  DB Atlas.
• Comfortable working with and supporting production services in cloud environments.
• Hands‑on experience with CI/CD…