Senior Java Engineer

Java

Senior Java Engineer

Java
Wadowicka 3a, Kraków

Loopme

Full-time
B2B
Senior
Hybrid
7 712 - 9 365 USD
Net per month - B2B

Job description

Are you interested in working with cutting-edge technologies and developing high-performance applications capable of handling over 2 million data queries per second? If so, we have the perfect job for you at LoopMe!


We are a team of skilled engineers who develop and maintain real-time bidding platforms for global advertisers. As part of our team, you will work alongside other talented engineers daily, using technologies such as Java, Postgres, Clickhouse, Kafka, and others to scale performance, optimize cloud infrastructure, and create innovative features for our various product lines.


Join us and be a part of our mission to push the boundaries of what is possible in the advertising industry!


What we need

We are looking for a Senior Java Backend Engineer to help build out our high-load ad serving system, capable of handling over 2M requests/second with 50ms response time.


What you'll be doing

  • Developing features and performance optimisation for our Java ad-serving application
  • Hardening system architecture to ensure smooth operation during peak-load time
  • Implementing complex targeting algorithms into the core ad-serving flow
  • Working hand-in-hand with multiple teams providing services and data used by our solutions


You'll have

  • 5+ years experience in engineering
  • Strong knowledge of Java, Spring / Spring Boot
  • Practical knowledge of SQL and experience with PostgreSQL (or any other database)
  • Good understanding of microservices architecture and best practices around that
  • Linux shell, Docker


Nice-to-have:

  • Concurrency understanding
  • Experience with gRPC, Project Reactor (formerly RxJava)
  • Experience with Kubernetes
  • Experience with Kafka
  • DGS framework / GraphQL


Benefits:

  • Flexible working schedule with the hybrid type of work
  • Annual performance bonus 
  • One month of workation (you can work from any part of the world for one month)
  • Multikafeteria

Tech stack

    English

    B2

    Java

    master

    Spring

    advanced

    Spring Boot

    advanced

Office location

Published: 30.07.2025

About the company

Loopme

LoopMe is a technology company that uses AI to improve brand advertising performance & outcomes.

Company profile