Back End Developer

RevTech; Greater London; On-site; GBP 60,000 - 90,000; Full time

Job summary

RevTech seeks a dedicated server-side engineer to own the API layer behind our consumer mobile apps used by millions of users globally. You will design and build the Backend-for-Frontend API, delivering fast, secure REST and GraphQL services to power real-time experiences.

You will collaborate with mobile, product and design teams to shape scalable solutions, optimize performance, and ensure robust deployment across distributed systems.

Qualifications

• Solid server-side experience in Kotlin (or Java/Scala).
• Hands-on REST and GraphQL API design.
• Experience with Gradle, CI/CD, and automated testing.
• Strong grip on asynchronous programming and performance optimisation.

Responsibilities

• Design Backend-for-Frontend API layer that powers large-scale mobile apps.
• Deliver fast, secure REST and GraphQL APIs for real-time experiences.
• Work with mobile, product and design engineers to shape solutions.
• Tune performance and scalability across distributed systems.

Skills

Kotlin

Java/Scala

API design

Asynchronous programming

Performance optimisation

CI/CD

Automated testing

Tools

Gradle

Job description

I'm working with a global engineering business looking for a server-side engineer to own the API layer behind consumer mobile apps used by millions of people worldwide. If you like your backend work to have a visible, real-world impact, this is a good one.

What you'll be doing:

• Designing and building the Backend-for-Frontend API layer that powers large-scale mobile apps
• Delivering fast, secure REST and GraphQL APIs for real-time consumer experiences
• Working side by side with mobile, product and design engineers to shape solutions
• Tuning performance and scalability across distributed systems

What they're looking for:

• Solid server-side experience in Kotlin (or Java/Scala)
• Hands-on REST and GraphQL API design
• Gradle, CI/CD and automated testing
• Strong grip on asynchronous programming and performance optimisation