Java Developer - Backend

Experis; City Of London; On-site; GBP 129,150 - 147,600; Full time

Job summary

Experis is seeking a Senior Backend Engineer to join our London-based team. You will design, implement and maintain Java backend systems that power our live game platform, collaborating closely with Unity developers and other backend engineers to deliver scalable features.

You will work in a hybrid setup with 2-3 days in London or opt for 100% remote, ensuring robust, reliable game-server infrastructure while mentoring junior developers and supporting operations and CI pipelines.

Qualifications

• Ability to architect, design and implement Java backend components.
• Experience building live game backends with high concurrency.
• Proficiency with Unix environments, Git and CI/CD pipelines.
• Hands-on with Kubernetes, Docker and modern cloud tooling.

Responsibilities

• Architect, design and implement Java backend components and systems.
• Collaborate with Unity engineers and other backend teams to deliver features.
• Investigate issues and support live game operations at scale.
• Mentor junior developers and contribute to best practices.

Skills

Java backend design

SOLID principles

KISS principles

Live game scale

Databases

UNIX

Git

Kubernetes

Docker

CI/CD

Gradle

GCP/GKE

Kafka

BigQuery

CI systems

Tools

Jenkins

Job description

Senior Backend Engineer

Location: London

Full Time - 40 hours pw

Rate: £700 - £800

Duration: 6 months

Hybrid - 2-3 days in London offer OR 100% remote

Work supporting our new generation of games. You will challenge and refine our way of working with internal technology.

Your role

As our Java Backend Developer you will be a part of a team with the mission to build and maintain technology to support the studio in creating our new games. This includes integrating with existing tech, developing new creative solutions for our games, investigating problems reported by the game teams and coaching fellow developers. You will work in close collaboration with our Unity developers to enjoy a creative, challenging and collaborative workplace where your ideas will be every bit as valued as your programming expertise.

Skills to create thrills

• Able to architect, design and implement components, features and systems in Java.


• Able to design technical solutions that follow a good balance between SOLID and KISS principles.


• Excited about working on a live game product with a massive number of active users.


• Knowledge of databases and general web development.


• Able to support game servers from a Level 3 support perspective, investigating issues when escalated.


• Experienced working with UNIX environments and Git.


• Experience working with custom tech stacks, reaching out to developers outside of the immediate team when needed.


• Great communication between our dedicated ops team, client developers and other backend developers.


• Ability to work with different teams and provide mentorship to junior developers


• Experience with developing backend for mobile apps.

Desired

• Experience with C# and Unity engine.


• Experience with Gradle build systems.


• Experience using Jenkins or other CI systems for automation.


• Experience with Kubernetes and Docker


• Experience with GCP/GKE


• Experience with Kafka and Big query