Senior Mobile Engineer - Core Tech

Office location: Cambridge, UK – This position offers flexible working options, including predominantly remote work. Applicants should be based (or willing to relocate) within a comfortable commuting distance of our office to attend onsite as required.

Are you an experienced mobile engineer who excels at creating seamless, secure, and high-performing mobile experiences across iOS and Android platforms?

As a Senior Mobile Engineer in our Player Gateway team, you’ll play a pivotal role in shaping how players first engage with Jagex titles, from their initial visit through to becoming active, returning members of our game communities. You’ll work at the intersection of mobile engineering, platform optimisation, and player experience, delivering scalable and secure solutions that power key touchpoints across the RuneScape franchise.

You’ll act as a subject matter expert, leading the delivery of complex mobile solutions while mentoring and developing a talented team of engineers and driving engineering excellence across the wider organisation.

What you’ll be doing:

• Contribute across the full Software Development Lifecycle, delivering secure-by-design, production ready code supported by automated testing, peer review, and reliable deployment practices.
• Act as a subject matter expert, ensuring technical solutions meet product needs and align with Jagex engineering standards.
• Take ownership of the quality and delivery of complex engineering initiatives, ensuring outcomes meet stakeholder expectations.
• Collaborate across teams and disciplines to deliver scalable, high-impact technical solutions.
• Proactively identify opportunities to improve systems, services, and engineering processes, driving continuous improvement across the organisation.
• Support team effectiveness by helping engineers break down work into clear, value-driven increments and contributing to a strong, resilient production environment.
• Participate in an on-call rotation to troubleshoot and resolve production issues when required.

What we’re looking for:

• Strong experience with native mobile development across both iOS (Swift / Objective-C) and Android (Kotlin / Java), with a deep understanding of platform constraints such as lifecycle, permissions and store policies.
• Proven experience delivering secure, maintainable mobile architecture that interfaces cleanly with backend microservices.
• Experience with automated testing, CI/CD pipelines, version control systems, and performance profiling tools.
• Strong debugging, optimisation and problem-solving skills, with the ability to navigate established codebases.
• Demonstrable ability to mentor engineers and contribute to improving engineering standards and best practices.
• Experience with C++ would be an advantage.

What we offer:

When you join Jagex you can look forward to a generous Perks & Benefits package including:

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!

About Jagex

We are Jagex: The RuneScape Company. Home to one of gaming’s most enduring success stories. We create deep, community-powered games with worlds that evolve, inspire, and endure. Our flagship MMORPG franchise, RuneScape, has welcomed over 300 million player accounts, inspiring generations of players across PC and mobile for 25 years.

As we begin our 26th year, we are accelerating our strategy to expand RuneScape into a broader ecosystem of forever games and connected experiences, grounded in a renewed commitment to integrity and fair play. This includes the reduction of monetisation mechanics, as well as the launch of RuneScape: DragonWilds into Steam Early Access in 2025, representing a major step in building a multi-genre future for the RuneScape universe. We remain focused on building enduring worlds, empowering player-led innovation, and laying the foundations for the boldest era in RuneScape’s history. For more information, visit www.jagex.com.

Headquartered in Cambridge, United Kingdom, we are home to passionate creators, storytellers, engineers, and even a few dreamers, all united by a single mission to shape the future of online worlds and empower players to make them their own. We’re looking for people to join us who share our ambitions and values. We foster an inclusive workplace built on trust, autonomy, and a shared passion for creating experiences that inspire our communities.
Our values guide everything we do: We Embrace Fellowship by collaborating and sharing openly. We Hone our Craft by always learning and improving; We Honour our Vows by being honest and transparent; We are our Customers’ Heroes by striving to understand our team & player needs, and We Seize The Day by making the most of every opportunity.

Join us. The next era of RuneScape and the next chapter of Jagex: The RuneScape Company starts now.

We are committed to providing equal opportunities and creating an environment where everyone can thrive. We welcome applications from all backgrounds, and we recruit, develop, and promote based on merit and ability.

If you require any reasonable adjustments to support you during the recruitment process, please let us know when you’re invited to interview.