Kotlin/Java Backend Engineer - Mobile APIs (INSIDE IR35)

Project overview

Kotlin/Java Backend Engineer - Mobile APIs (INSIDE IR35)

We are looking for experienced Kotlin/Java Backend Engineers to join a major financial services organisation, working on the Back End services supporting large-scale iOS and Android mobile applications used by millions of customers worldwide.

There are opportunities for both hands-on Backend Engineers and more senior engineers with technical design and leadership experience.

Responsibilities

Required Skills & Experience:

Desirable Experience:

Kotlin/Java Backend Engineer - Mobile APIs (INSIDE IR35)

• Design, develop and maintain scalable Back End services and APIs.
• Build Backend for Frontend (BFF) solutions supporting mobile applications.
• Develop high-quality code using Kotlin and/or Java.
• Work with REST APIs, microservices and existing enterprise Back End systems.
• Participate in code reviews, testing, debugging and performance optimisation.
• Collaborate with engineering, architecture, product and QA teams.
• Contribute to CI/CD pipelines, monitoring and continuous improvement.
• Support technical architecture and mentor engineers where appropriate.
• Strong hands-on Back End development experience with Kotlin and/or Java.
• Experience developing REST APIs and microservices.
• Familiarity with Spring/Spring Boot.
• Experience with Maven or Gradle.
• Understanding of CI/CD, automated testing and software development best practices.
• Experience working in Agile engineering environments.
• Strong problem-solving and communication skills.
• Java 17+
• Backend for Frontend (BFF) architecture
• Domain-Driven Design (DDD)
• GitHub Actions/CircleCI
• Dynatrace, ELK or Sentry
• GraphQL/RAML
• Technical leadership, solution design or mentoring experience

Project details

• Start: ASAP
• Duration: 6 Months + Extension
• Location: United Kingdom, GB
• Rate: 44-50 EUR/h