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

This is us

At Avenga, we believe that human creativity empowers technology that matters. Operating globally, our 6000+ specialists provide a full spectrum of services, including business and tech advisory, enterprise solutions, CX, UX and Ul design, managed services, product development, and software development.

This is the job

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.

This is you 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 skills: 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

This is your role 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

At Avenga, everyone matters. We provide equal opportunities in recruitment, career development, and leadership, regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to fostering a work environment where our diverse community of employees, candidates, and business partners actively shapes our growth. By bringing together people from different backgrounds and experiences, we build a workplace where everyone feels free to be themselves while honoring the boundaries of others.