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LoopMe

Senior Java Engineer

LoopMe
Poland · Full-time · Mid-Senior

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 on a daily basis, 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

To all recruitment agencies: LoopMe does not accept agency resumes. Please do not forward resumes to our jobs career page, LoopMe employees or any other company location. LoopMe is not responsible for any fees related to unsolicited resumes.

Key Skills

Ranked by relevance

java microservices postgresql docker kafka cloud grpc sql
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Posted
Jul 30, 2025
Type
Full-time
Level
Mid-Senior
Location
Cracow
Company
LoopMe

Industries

IT Services IT Consulting

Categories

Engineering

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