You’ll become a part of product development that is used by thousands of businesses worldwide.

DataXu is looking for a Java Developer to join our engineering team working on the next generation of DataXu’s industry-leading DMM (Digital Marketing Management) platform based on a real-time bidding solution with high-load up to 2M rps and used by leading advertisers to manage their online ad campaigns across all media channels, device platforms and advertising exchanges.

Java 11, Concurrency, Big Data, Amazon AWS (EC2, Autoscaler, Kinesis, Cloudfront, Cloudwatch, Spark, Athena...), Aerospike, Avro, Zookeeper, Thift, Netty, Tomcat, Apache Mina, Lucene

Qualifications and Skills
— Expert knowledge of Java Core
— In-depth understanding of Engineering
— Good understanding and practical knowledge of multithreading
— 3-5 years of relevant software development experience
— Experience in building flexible, scalable, and efficient systems capable of running in real time
— Product-focused mindset
— Team-player with strong interpersonal skills
— English — Upper Intermediate or above

— Start-up experience
— Experience of test driven engineering of distributed and data driven systems
— Experience with large database systems
— Strong verbal, written and team-oriented communication skills

— Solve interesting problems, such as scaling applications for large data computation and reporting
— Contribute to the requirements, architecture and implementation of existing and future systems
— Deliver constant value back to the business in a highly agile team approaching near-continuous deployment
— Collaborate effectively with engineers and other team members
— Anticipate problems or issues that may arise, forecast high risk areas in software
— Be part of a continuous improvement atmosphere, proactively suggesting improvements to the platform and development processes
— Adapt quickly to new technologies

We offer multiple benefits, that include
— Challenging work in an international professional environment
— Long standing team as this is for a long term project
— Mature and highly professional leadership team on Client’s side
— Mastering English language with a native speaker
— 40-hours working week with flexible working hours
— Flexible work-from-home policy
— Competitive salary
— PE accounting and support
— 20 paid vacation days per year
— 14 paid sick leaves per year
— Annual 250$ deposit for attending external events (conferences, workshops, etc.)
— Collaborative friendly team environment
— Cozy fully equipped office space in city center (near ”Palats Ukraina” subway station)

The project
DataXu ( is a petabyte scale marketing cloud that enables marketers to better understand and engage their customers. Powered by Active Analytics™, our patented approach to Programmatic Marketing, the DataXu Marketing Cloud is a suite of applications that transform big data into better customer experience – at the speed of life. Our software helps marketers focus their marketing investments and achieve optimal results across all available media formats, devices, channels, and buying modes. With thirteen offices in nine countries, DataXu is powering the digital transformation of the world’s most valuable brands. Visit for more information.

About Rails Reactor

We Design and Code purposeful and impactful software solutions for startups and Enterprise.
With the special expertise in Ruby, AI, Machine Learning, Big Data, Mobile, AR/VR and more, we deliver our services across multiple industries like Healthcare, Ecommerce, Retail, Marketing Automation tools and On-demand services mainly for US-based customers. With the headquarters in San-Francisco and offices in Boston and New-York, we keep abreast with US business scene.

Besides delivering software solutions, Rails Reactor pays the great attention to building and improving local JS, AI, PM and multiple other communities in Kyiv. We do that by running and hosting meetups, workshops and hackathons under the brand “Meetup Tonight”.

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