Senior Java Engineer

Java

Wadowicka 3a, Kraków

Loopme

28 000 - 34 000PLN

Net per month - B2B

Full-time

B2B

Senior

Hybrid

Tech stack

English

B2

Java

master

Spring

advanced

Spring Boot

advanced

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

Published: 14.08.2025

Meet the company

Loopme

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

Company profile

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