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Middle/Senior Java Software Engineer

Madfish

Madfish

Software Engineering
Ukraine
Posted on Nov 28, 2025

Description

Founded in 2007, Client’s pioneering technology created a new model for the advertising industry. Today, our automated advertising platform is used by the world’s leading publishers and applications to transact with top brands around the globe enabling them to reach more than 1 billion consumers. The Client operates the largest independent Display Advertising Exchange and Supply Side Platform that automates the buying and selling of Display Advertising across all formats (banner, video) on all devices (desktop browsers, mobile devices, billboards). The Client auctions over 20 Billion Ads on a daily basis in real time in less than 1/2 of a second each. The Client is a publicly traded company (NYSE: RUBI) headquartered in Los Angeles, California, USA.

Requirements

– Experience building and operating large-scale, high-throughput, enterprise apps
– 3+ years coding experience in server-side Java
– Excellent Java Core knowledge (Java 8 or higher, Collections, Exceptions, Concurrency)
– Experience with RDBMS (MySQL, PostgreSQL), native SQL, ORMs (Hibernate)
– Experience with automated testing frameworks (TDD, Mocking, Unit/Functional/Integration)
– Handy use of cloud services (AWS)
– Understanding of VCS (Git)
– Experience working in a Linux environment.
– Fluent English verbal and written communication skills
– Shifted working hours 12pm till 8pm EEST time zone

Nice to have experience with:
– Familiar with Scala, Spark
– Commercial experience with Spring Framework (Boot, Core, MVC, Data)
– Experience with Redis, Aerospike, RabbitMQ, Kafka, Camel

Job responsibilities

– Write production-ready code and unit tests that meet both system and business requirements.
– Respond to feature requests, bug reports, performance issues, and ad-hoc questions.
– Work collaboratively with multiple teams to deliver quality software.
– Comfortable in multi-tasking and fast-pacing dev process.
– Support operation of services in production.