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London, England, United Kingdom · Remote OK
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London, England, United Kingdom · Hybrid
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01HealthLondon, England, United Kingdom · Hybrid
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London, England, United Kingdom · Hybrid
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London, England, United Kingdom · Hybrid
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London, England, United Kingdom · On-site
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Develop and enhance the DAX Exchange and DOOH Scheduler using modern Java to power programmatic advertising. Maintain production services through monitoring, troubleshooting, and collaborating with senior engineers via code reviews.
Requires a degree in Computer Science or equivalent practical experience with strong foundations in Java and OOP. Candidates should be familiar with Git, Linux, and Agile methodologies, with a growth mindset toward cloud and real-time systems.
Your Role: Junior Java Developer – DAX Exchange
Are you an early-career engineer who wants to build high-performance systems that power digital advertising at scale?
As a Junior Java Developer – DAX Exchange at Global, you’ll join a small, focused team building performance-critical services in modern Java. You’ll work on the matching engine that connects advertisers with outdoor screens and, over time, live radio and on-demand audio. You’ll contribute to production code from day one and learn how real-time systems are designed, built and run in the cloud.
Key Responsibilities
Backend development (40%): Contribute to the DOOH Scheduler and DAX Exchange, delivering features, fixes and enhancements across the platform using modern Java.
Quality and reliability (20%): Write clean, well-tested and maintainable code that meets the team’s standards for performance, resilience and observability.
Operational support (20%): Help monitor, troubleshoot and maintain production services, gaining experience with supporting real-time, always-on systems.
Learning and collaboration (20%): Pair with senior engineers, participate in code reviews and technical discussions, and support continuous improvement in how the team works.
What You’ll Love About This Role
Think Big: Help build the matching engine that powers programmatic advertising across outdoor screens in the UK, with growing opportunities across live radio and digital audio.
Own It: Ship code that runs in production, take responsibility for your changes and see the direct impact of your work on a critical platform.
Keep it Simple: Learn to design clear, focused services and straightforward solutions to complex performance and scalability challenges.
Better Together: Work in a small, supportive team where you’ll receive mentoring, regular feedback and a clear path from junior to mid-level.
What Success Looks Like
In your first few months, you’ll have:
Contributed working, well-tested code to the matching engine and related services.
Gained a solid understanding of the DAX platform, its data flows and performance requirements.
Learned and applied the team’s development practices, tooling and deployment workflows.
Helped support production systems, including monitoring, debugging and incident follow-up.
Built strong working relationships with your teammates through pairing, reviews and regular collaboration.
What You’ll Need
Technical foundations: Experience from a Computer Science (or similar) degree or equivalent practical background, with a strong understanding of core data structures and algorithms.
Java and OOP fundamentals: Knowledge of Java and core object-oriented concepts such as inheritance, composition and common design patterns.
Engineering practices: Familiarity with Git, basic Unix/Linux commands and working within an agile software development environment.
Attention to detail: A careful, methodical approach to writing, reviewing and testing code.
Growth mindset: Curiosity about how software interacts with hardware and networks, and an interest in learning more about cloud infrastructure, containerisation and real-time systems.
Nice to have (not essential): Interest in low-level performance, networking or systems programming; exposure to AWS or other cloud platforms and/or containerised environments; curiosity about digital advertising, media or high-throughput real-time platforms.
Making everyone’s day brighter
The UK and Europe’s largest Radio & Outdoor company, Global is home to respected, national market-leading media brands broadcasting across the UK on DAB & FM and around the world on Global Player, including Heart, Capital, LBC, Capital XTRA, Capital Dance, Classic FM, Smooth, Radio X and Gold Radio. Global Player allows listeners to enjoy all of Global’s radio brands, award-winning podcasts, and expertly curated playlists, in one place in app, on web and on smart speakers. Global is also one of the leading Outdoor companies in both the UK & Europe, with over 253,000 sites reaching 95% of the UK population. Global’s extensive and diverse outdoor portfolio encompasses Transport for London’s Underground network, almost all major UK airports including Gatwick, the UK’s largest portfolio of roadside posters and premium digital screens in prime locations, as well as the UK’s largest network of buses including all major cities. On-air, on Global Player and with our outdoor platforms combined, Global reaches 51 million individuals across the UK every week, including 29 million on the radio alone.
Offices: 30 Leicester Square, London, WC2H 7LA, GB · 11 Brindley Place, Birmingham, England B1 2LG, GB · Temple Quay, One The Square, Bristol, England BS1 6DG, GB · Hemingway Rd, The Red Dragon Centre, Cardiff , CF10 4JY, GB · 1 West Regent Street, 8th Floor, Glasgow, Scotland G2 1RW, GB
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