Junior Java Developer (AdTech)

TL;DR

Junior Java Developer (AdTech): Building and optimizing high-performance matching engine services for digital advertising platforms with an accent on Java development, system reliability, and real-time data processing. Focus on contributing to production code, learning cloud-based infrastructure, and collaborating within a supportive engineering team.

Location: Must be based in or able to commute to the Holborn office in London (3 days per week)

Company

hirify.global is a leading media and entertainment company powering programmatic advertising across outdoor screens, live radio, and digital audio.

What you will do

• Contribute to the development of the DOOH Scheduler and DAX Exchange using modern Java.
• Write clean, well-tested, and maintainable code meeting performance and observability standards.
• Monitor, troubleshoot, and maintain production services in a real-time environment.
• Pair with senior engineers and participate in code reviews to support continuous improvement.
• Learn and apply team development practices, tooling, and deployment workflows.

Requirements

• Strong understanding of core data structures and algorithms (Computer Science degree or equivalent).
• Proficiency in Java and core object-oriented concepts.
• Familiarity with Git, Unix/Linux commands, and agile development environments.
• Methodical approach to writing, reviewing, and testing code.
• Must be able to work from the London office 3 days per week.

Nice to have

• Interest in low-level performance, networking, or systems programming.
• Exposure to AWS or other cloud platforms.
• Experience with containerized environments.
• Curiosity about digital advertising and high-throughput real-time platforms.

Culture & Benefits

• Supportive team environment with real mentoring and regular feedback.
• Clear path for career progression from junior to mid-level.
• Commitment to a healthy work-life balance and flexible, agile working.
• Inclusive culture dedicated to celebrating diverse voices.