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 a principal-level mobile engineer ready to set the technical direction for mobile across one of the world’s most iconic gaming franchises?
As a Principal Mobile Engineer in our Player Gateway team, you’ll own the mobile architecture and engineering strategy that shapes how players first experience Jagex titles – from their very first visit through to becoming active members of our game communities. This is a role with genuine organisation-wide impact: your technical decisions will set the standards and patterns that engineers across multiple teams build on.
You’ll lead the most complex, high-stakes mobile initiatives from concept through to production, influence engineering strategy beyond your immediate team, and raise the bar for mobile engineering across the discipline – all while helping the next generation of engineers grow.
What you’ll be doing:
- Own the technical direction and architecture for mobile initiatives within the Player Gateway team, influencing engineering standards and strategy across the wider discipline.
- Lead the delivery of our largest, most complex mobile initiatives – breaking down ambiguity, de-risking delivery, and defining the approaches other engineers follow.
- Drive long-term improvements to systems, services, and ways of working that extend well beyond a single team, shaping the future of mobile at Jagex.
- Contribute across the full Software Development Lifecycle, delivering secure-by-design, production-ready code backed by automated testing, peer review, and reliable deployment.
- Lead build/buy evaluations and architectural proposals, ensuring technical solutions meet both product needs and Jagex’s engineering standards.
- Raise the engineering bar across the mobile discipline through coaching, mentoring, and championing best practice - multiplying the effectiveness of those around you.
- Participate in an on-call rotation to troubleshoot and resolve production issues when required.
What we’re looking for:
- Demonstrable expertise in native mobile development across both iOS (Swift / Objective-C, Xcode, Instruments) and Android (Kotlin / Java, Android Studio, profilers), with a deep understanding of OS-level constraints including app lifecycle, permissions, backgrounding, and store policies.
- Proven ability to set and own technical direction and mobile architecture across multiple teams or an engineering discipline.
- Track record of leading large, ambiguous, or cross-team technical initiatives from concept through to production, with minimal direction.
- Demonstrated experience influencing technical strategy and building consensus across teams and senior stakeholders without direct authority.
- Proven ability to raise engineering standards across a discipline through coaching, technical leadership, and championing best practice.
- Strong experience with automated testing, CI/CD systems (e.g. Git, Bitbucket Pipelines, Bamboo), debugging, profiling, and mobile performance optimisation at scale.
- Experience with A/B testing frameworks, analytics SDKs, and collaborating with UX designers to deliver streamlined player experiences is advantageous. Experience with C++ and game systems is a plus.
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.
Inclusion & Accessibility Statement
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.
Skills Required
- Strong experience with native iOS development (Swift / Objective-C)
- Strong experience with native Android development (Kotlin / Java)
- Proven experience delivering secure, maintainable mobile architecture interfacing with backend microservices
- Experience with automated testing and CI/CD pipelines
- Experience with version control systems
- Experience with performance profiling and optimization tools
- Demonstrable ability to mentor engineers and improve engineering standards
- Participation in on-call rotation to troubleshoot production issues
- Based in or willing to relocate within commuting distance of Cambridge, UK (able to attend onsite as required)
- Experience with C++
What We Do
A leader in creating deep and engaging forever games on PC, Console & Mobile that empower our communities. Jagex was founded in 2001 and is today one of the UK’s biggest and most respected video game developers and publishers. Famed for its flagship MMOs RuneScape and Old School RuneScape, Jagex has welcomed more than 300 million player accounts to its world and created a $1bn lifetime franchise revenue. Today the RuneScape franchise exists beyond running games in live operations; our titles are forever games that connect and inspire millions of players, with content and experiences both inside and outside of inexhaustible game worlds. Both RuneScape and Old School RuneScape, on PC and mobile, offer ever-evolving, highly-active worlds and our community-focused development ethos empowers players to have a real say in how each game is shaped. Jagex has added to its skill set with the acquisitions of Pipeworks and Gamepires in 2022, bringing our expertise to titles such as SCUM, helping to make SCUM a forever game. It also works with external partners on products such as Melvor Idle and This Means Warp; bringing these titles to new and existing audiences. Jagex employs more than 600 people at its Cambridge headquarters and around the world at Pipeworks in North America, and Gamepires in Europe. We’re always on the hunt for talented people to work across the business, to help the company to achieve its goals.
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