Principal Mobile Engineer – Core Tech

Jagex

Principal Mobile Engineer leading technical initiatives and shaping mobile architecture for Jagex's RuneScape franchise. Delivering scalable mobile solutions across multiple teams and projects in a hybrid working environment.

Posted 5/28/2026full-timeCambridge • 🇬🇧 United KingdomLeadWebsite

Tech Stack

Tools & technologies

AndroidiOSJavaKotlinMicroservicesObjective-CSwift

About the role

Key responsibilities & impact

Own and drive mobile engineering initiatives across multiple projects, ensuring alignment with product goals and long-term technical strategy.
Define and evolve mobile architecture across iOS and Android, ensuring scalability, performance, and maintainability.
Lead the delivery of complex technical solutions, coordinating across teams and managing dependencies at a system level.
Establish and uphold engineering standards across mobile development, including code quality, testing, and deployment practices.
Identify and drive improvements to systems, services, and engineering processes to support reliable, scalable delivery.
Work closely with backend, product, and platform teams to ensure seamless integration across services and user journeys.
Guide technical decision-making, balancing short-term delivery with long-term system health and evolution.

Requirements

What you’ll need

Proven track record leading large-scale mobile engineering initiatives within production environments.
Deep expertise in native mobile development across iOS (Swift / Objective-C) and Android (Kotlin / Java).
Strong experience defining and evolving mobile architecture integrated with backend microservices.
Strong understanding of the software development lifecycle, including CI/CD, testing, and release practices.
Experience operating across teams to manage technical direction, dependencies, and delivery outcomes.
Advanced debugging, performance optimisation, and system-level problem-solving capability.
Experience with C++ is an advantage.

Benefits

Comp & perks

Private Healthcare, including Dental Plan.
Discretionary annual performance bonus.
Minimum 6% Pension contributions.
Life Insurance.
Enhanced family leave policies from day 1.
Flexible working hours.
25 days annual leave + Bank holidays & the option to buy/sell holidays + so much more!

ATS Keywords

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Hard Skills & Tools

iOS developmentAndroid developmentSwiftObjective-CKotlinJavaC++mobile architectureCI/CDperformance optimization

Soft Skills

leadershipcoordinationproblem-solvingcommunicationdecision-making