At a Glance
- Tasks: Build high-performance systems for digital advertising using modern Java.
- Company: Join a dynamic team at Global, a leader in digital advertising.
- Benefits: Hybrid work model, mentorship, and opportunities for career growth.
- Other info: Collaborate with experienced engineers and contribute to production code from day one.
- Why this job: Make a real impact on innovative projects in a supportive environment.
- Qualifications: Knowledge of Java, OOP, and a passion for learning.
The predicted salary is between 60000 - 80000 £ per year.
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, learning how real‑time systems are designed, built and run in the cloud. This is a hybrid role based in our Holborn office in London (3 days per week).
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, learning how to support 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: 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 real mentoring, regular feedback and a clear path from junior to mid‑level.
What Success Looks Like
- 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 (but 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.
Junior Java Developer in London employer: Global
At Global, we pride ourselves on being an excellent employer, offering a dynamic work culture that fosters collaboration and innovation. As a Junior Java Developer in our Holborn office, you'll benefit from hands-on mentorship, opportunities for professional growth, and the chance to contribute to impactful projects in digital advertising. With a hybrid work model and a supportive team environment, you'll find a rewarding career path that encourages continuous learning and development.
StudySmarter Expert Advice🤫
We think this is how you could land Junior Java Developer in London
✨Join Developer Communities
Get involved in online developer communities like GitHub or Stack Overflow. We can showcase our skills by contributing to open-source projects – it’s a great way to network, learn, and possibly catch the eye of a recruiter while doing something we love!
✨Attend Coding Meetups and Hackathons
Check out local coding meetups and hackathons. These events are fantastic for meeting other developers and potential employers, plus they're a great way to get some hands-on experience and showcase our problem-solving skills in real-time.
✨Set Up a Public Portfolio
We should create a public portfolio or GitHub repository showcasing our projects and code. This not only demonstrates our technical skills but also gives employers a peek into our creative process and problem-solving abilities.
✨Utilise University Career Services
If we're fresh out of uni, let's not forget about our university’s career services! They often have tailored resources and connections in the software development field. Plus, internships can lead to entry-level roles – a true win-win!
We think you need these skills to ace Junior Java Developer in London
Some tips for your application 🫡
Show Off Your Coding Skills:As this is an entry-level role in software engineering development, make sure to include your coding projects. Whether it's a cool school project, a personal website, or even contributions to open-source, it all counts! Link to your GitHub or any platforms you've showcased your code on – we want to see what you've got!
Tailor Your CV to Highlight Relevant Skills:Make your CV work for you by focusing on the programming languages and frameworks you've learned. If you've dabbled in JavaScript, Python, or any specific frameworks, be sure to include those. Plus, showcasing any relevant coursework or certifications can really help us get a clearer picture of your skill set.
Craft a Motivating Cover Letter:Since you're applying for an entry-level position, your cover letter is your chance to shine. Tell us why you’re passionate about software engineering and what excites you about working with Global. Highlight any internships or projects that shaped your interest in coding – it’s all about your motivation!
Use Your Network:Don't hesitate to mention any connections you might have to Global in your application. If you know someone who works there or have attended any events they hosted, slip that into your cover letter. It shows your genuine interest and can give you that extra edge in your application!
How to prepare for a job interview at Global
✨Know Your Code: Prepare for Technical Questions
For a role in software engineering, you can bet your Interviewer might throw some coding problems your way. Brush up on common algorithms and data structures, and practise coding on platforms like LeetCode or HackerRank. That way, you're ready to showcase your problem-solving skills confidently!
✨Portfolio Power: Show Off Your Projects
As an entry-level candidate, your portfolio is your secret weapon. Make sure you have a few solid projects on GitHub that demonstrate your coding skills and understanding of software development processes. Be ready to walk through your code and explain your thought process during the interview.
✨Familiarise Yourself with Agile and Development Tools
Understanding Agile methodologies can really set you apart from other entry-level candidates. Get familiar with tools like JIRA or Trello, and be prepared to discuss how you've used them in your projects or studies. This shows you're not just a coder but also a team player.
✨Demonstrate Your Learning Mindset
Since you're applying for an entry-level position, it's important to show your eagerness to learn. Be ready to discuss how you’ve tackled challenges in your studies or projects, what new skills you’ve picked up recently, and how you plan to continue developing in this fast-paced field.
