Senior Java Engineer – High-Load & Real-Time Systems

Avenga is an international engineering firm helping businesses operate with AI at the core. With 6,000+ experts worldwide, we combine engineering expertise with AI-native thinking to turn ambitious ideas into real-world impact across industries, technologies, and markets.

About the Position

We are looking for a Senior Java Engineer to join a project for a leading US streaming technology company transforming how people watch television.

You will contribute to a highly scalable, highly available, real-time advertising platform that supports a rapidly growing streaming business. Working with an experienced international engineering team, you will design and develop high-performance backend applications operating at scale.

This role is an excellent match for an engineer who has a strong command of Java, understands concurrency beyond the framework level, and enjoys solving complex performance and scalability challenges.

Responsibilities

• Design, develop and maintain large-scale, highly available, real-time Java applications
• Build efficient concurrent and asynchronous processing solutions
• Investigate and resolve performance, scalability and reliability challenges
• Write clean, maintainable and well-tested production code
• Contribute to technical decisions, engineering standards and development best practices
• Collaborate with engineers, product specialists and analytics teams on strategic initiatives
• Identify technical gaps and operational problems and propose robust solutions
• Communicate effectively with both technical and non-technical stakeholders
• Take ownership of delivered solutions throughout the development lifecycle

Requirements

• At least 5 years of professional experience in Java backend development
• Hands-on experience building large-scale, low-latency distributed systems
• Strong command of Java 11 or newer
• Solid practical knowledge of Java Concurrency and multithreading
• Experience with asynchronous programming in Java, including CompletableFuture
• Good understanding of algorithms, data structures and performance optimization
• Strong knowledge of object-oriented programming and software design principles
• Basic understanding of high-load system design and scalability techniques
• Basic practical knowledge of Kafka
• English at B2 level or higher, enabling effective communication in an international team

Nice to Have

• Experience with distributed caching
• Experience working with SQL and NoSQL databases
• Knowledge of AWS or other cloud platforms
• Experience with Big Data technologies
• Previous experience in adtech, streaming, media, fintech or another high-throughput domain

We Offer

• Fully Remote work from Poland
• Opportunity to work with cutting-edge technologies
• Professional growth and development opportunities
• Collaborative and inclusive work environment

About the Company

People are at the core of Avenga. We provide equal opportunities regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to a respectful environment where everyone can be themselves, share their ideas, and feel that they belong.

Application Process

1. Send your CV: Tell us about your core skills and what you're looking for next.
2. Talent Call: Meet our Talent team to talk about your goals and experience while exploring our culture and the way we work.
3. Technical Interview: We'll explore your experience, strengths, and approach to work to see what we can build together.
4. Customer Interview: For some roles, you'll meet our customers to understand the outcomes your expertise can help create.
5. Welcome to Avenga: An offer is just the beginning. We welcome you to put your expertise into action and shape what's next together.