Job Details


Belfast, Northern Ireland


Senior Big Data / Java Engineer

  • Overview of Citi:

    Citi, the world leading global bank, has approximately 200 million customer accounts and a presence in more than 160 countries and jurisdictions worldwide. Citi provides consumers, corporations, governments and institutions with a broad range of financial products and services, including consumer banking and credit, corporate and investment banking, securities brokerage, transaction services, and wealth management. Citi enables clients to achieve their strategic financial objectives by providing them with cutting-edge ideas, best-in-class products and solutions, and unparalleled access to capital and liquidity.


    About the Team:

    As one of the principal players in the world’s financial markets, Citi is involved in conducting millions of trading events every day.  We have a responsibility to the financial regulators, our clients and ourselves to identify and prevent fraudulent, malicious or erroneous behavior.


    Citi is building a distributed data platform to drive its surveillance functions by acquiring the trading events and enrichment data required for a combination of rule-based and advanced feature-based surveillance algorithms.  The volume and variety of data involved in these surveillance's and the complexity of the algorithms results in one of most challenging and appropriate use cases for big data technologies.


    The Big Data Development Team is rapidly establishing itself in Belfast - the global centre for Citi’s Trade Surveillance software development with the full SDLC from business requirements through to production support. 

    To aid in the growth of the team we are looking to bring in a senior Big Data / Java engineer to help to build next generation surveillance's using cutting edge techniques.  This is a significant opportunity for an experienced developer or engineer with experience in modern data platforms to move into a role working with a variety of development teams, including close collaboration with an on-site data science team.


    Technologies and Languages:

    • Java

    • Hadoop (CDH)

    • Hive

    • Spark

    • Python

    • SQL (Oracle, SQL Server, Netezza)

    • Linux

    • Containerization

    • Continuous Integration

    • Containerization


    About the Role:

    You will report into the Development Team Lead, also located in Belfast. This role has no direct reports, however as a Senior member of the team mentoring more junior members and sharing your expertise through relevant forums is required. You will engage with colleagues and teams in UK, North America and India


    Key responsibilities:

    • Collaborating with the architecture team to define best practice in Java and Hadoop development paradigms including documentation and system monitoring

    • Challenging and helping to direct our technical roadmap and proposing the adoption of new technology or techniques

    • Providing breakdowns of project deliverables and estimates

    • Designing and building data pipelines and Hadoop storage objects

    • Assist in the resolution of production issues when required

    • Mentoring team members

    • Working with data analysts to define logical data structures

    • Encouraging self-learning among the team


    Essential Skills & Qualifications:

    • A confident engineer with an authoritative knowledge of Java and ideally Hadoop or other distributed data platforms

    • Comfortable working with large data volumes and be able to demonstrate a firm understanding of logical data structures and analysis techniques

    • Able to demonstrate an expertise in identifying and resolving data quality issues – in data sets at rest and in flight

    • An expert SQL coder and at ease writing Linux shell scripts

    • Experienced with automated build and test processes

    • An adept written and verbal communicator

    • Highly adaptable and be willing to mentor and train more junior team members

    • Organized and prepared to manage multiple parallel pieces of work

    • Appreciative of a diverse workforce and recognize that differences in style or perspective are one of our organisation’s key strengths


    Additionally, the following attributes will be advantageous:

    • A strong degree in any mathematical subject including computer science, physics, mathematics or engineering

    • Knowledge of agile development methodologies

    • Prior work on cloud computing platforms

    • Hands-on experience with other big data tools such as Oozie, YARN, Spark, SparkSQL, Flume, Sqoop2, Pig, Drill, Kafka, Elastic

    • Familiar with the financial services industry and/or regulatory environments

    • Be able to demonstrate an active participation in the big data, analytics or general IT community

    • Experience in the implementation of machine learning algorithms

    • Prior experience in working with remote teams 


    Exceptional candidates who do not meet these criteria may be considered for the role provided they have the necessary skills and experience.


    What’s in it for you?

    • Opportunities to demonstrate leadership ability as you mentor and guide the delivery of junior team members

    • Hands-on development experience on a production implementation of Hadoop with massive data volumes

    • Potential to contribute to projects involving complex feature-based data algorithms

    • Exposure to data science and surveillance functions in a dynamic and challenging industry with regular close collaboration with our surveillance portfolio clients

    • A team with a win-together/lose-together attitude and strong sense of identity and positive culture

    • Learning & Development opportunities


    What we Offer:

    As well as a competitive salary and consideration for a yearly discretionary bonus Citi offer;

    • 23 days paid annual leave

    • Award winning pension scheme,

    • Life assurance and

    • Private medical insurance with Bupa healthcare.


    In addition, we offer a competitive maternity, paternity and adoption leave scheme. We pride ourselves on our ability to offer employees a number of lifestyle benefits including; on site restaurant and coffee shops, online shopping and concierge service and subsidised clubs and societies.


    Our Select benefit package offers you the opportunity to customise your benefits according to your own lifestyle preferences and includes corporate discounts, memberships and a range of additional extras.

    Our vast range of diversity networks and on site multi faith room demonstrates Citi’s commitment to growing a diverse workforce.