Senior Cloud Java Developer at OpenX
Krakow, PL
OpenX is looking for talented and highly motivated Senior Software Engineer to help us innovate and improve our products. You will work in all aspects of agile application development, including our enterprise platform that interfaces with a multitude of services that are depended on to deliver billions of requests per day. Your opinions will be important in all phases of product development, starting from requirements to validation and deployment.

Working on the enterprise platform, you will be working with multiple distributed teams to architect, create, and deliver new features and functionality in order to deliver the best possible advertising experience in the market. Scalability, performance, and rock-solid reliability are all factors to consider with every line you code.


You will be involved in a couple of projects, for instance:

Marketplace Quality (Traffic Quality and Ad Quality) - recognise non-human traffic and block it to reduce cost of our infrastructure and to not overload our demand side partners, detect malware in ads, check if they meet standards and keep websites and visitors safe, provide response in few milliseconds if quality of traffic and ads is good for 100 billions of requests per day. Check our video on

Audience system, which is responsible for user targeting and cookie matching. Serves OpenAudience data for the AdExchange, integrates with 3rd party DMP and DSP, processes billions of records daily, handles cookie matching signals, provides user data in a few milliseconds for 100 billions of ad requests daily.

All above is happening globally, hosted in the Google Cloud Platform. Sounds like a challenge to you?

Key Responsibilities
    • Design high-performance, distributed, low-latency systems
    • Design data processing solutions based on Hadoop (DataProc)
    • Architect, create and deliver new features and functionality
    • Work with Product to drive the requirements, and own the project end-to-end
    • Analyze and improve efficiency, scalability, and stability of services and processes
    • Think long-term and be unsatisfied with band-aids
    • Identify unnecessary complexity and remove it

Required Qualifications
    • Ideally 5+ years for working experience in Java along with a MSc degree in Computer Science or equivalent degree. If you are not that experienced please get in touch with us anyway!
    • Experience in GoLang
    • Experience in BigData ecosystem (Hadoop, MapReduce, Spark, AitFlow)
    • Good written and spoken English skills
    • User level knowledge of Linux systems
    • Experience in Google Cloud Platform, k8s, docker, Prometheus, Grafana is a big advantage
    • Experience working in digital media, marketing technology or advertising technology is a big plus.

Desired Characteristics
    • Good written & oral communication skills
    • Accuracy, responsibility
    • Ease of fast learning
    • Good sense of humour
    • Team player
    • Self-starter with the ability to independently identify and act on areas of improvement

Desired Qualifications
    • Fluently speak algorithms and data structures and platforms (Linux)
    • Be comfortable using the right tools and languages for the job, even brand new ones
    • Have the ability to develop scalable, modular applications
    • Agile environment experience

What We Offer
    • Free Catered Lunches every Monday, Wednesday and Friday
    • Extra days off
    • Travel allowance
    • Private medical healthcare for you and your relatives
    • Life insurance
    • Multicafeteria
    • Standing desks - all desks at our office are adjustable
    • Snacks & Drinks (healthy options available)
    • SocialX Club
    • Great opportunities to work with your local team as well as with the teams in the US
    • New modern office close to the City Center

OpenX Values

Our five company values form a solid bedrock serving to define us as a group and guide the company. Our values remind us that how we do things often matters as much as what we do.

We are one

One team. No exceptions. We are a group of strong and diverse individuals unified by a clear common purpose.

Our customers define us

We know our business flourishes or dies because of our customers.

OpenX is mine

We are all owners of OpenX. We stake our personal and professional reputations on the excellence of our work.

We are an open book

We are eager to teach and share what we know with others.

We evolve fast

We take risks and confront failure openly. We recognize and repeat success aggressively. We actively seek out and provide constructive criticism. Defensiveness is for weaklings!

The above job description is not intended to be an all-inclusive list of duties and standards of the position. Incumbents will follow any other instructions, and perform any other related duties, as assigned by their supervisor, policy and c

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