Senior Java Cloud Developer

Citigroup Inc.; Warszawa; On-site; PLN 190,000 - 275,000; Full time

Job summary

A leading global financial services company in Warsaw is seeking a Senior Engineer for their Applications Development Technology Lead Analyst role. The successful candidate will design and maintain a platform responsible for extensive risk calculations. Ideal candidates should have significant experience with Java and cloud technologies, along with a commitment to mentoring and team collaboration. This position offers a competitive salary and a variety of benefits in a hybrid work environment.

Benefits

Private Medical Care Program

Life Insurance Program

Pension Plan contribution

Employee Assistance Program

Paid Parental Leave Program

Sport Card

Holidays Allowance

Sport and team recreation activities

Learning and development resources

Discretionary annual performance bonus

Qualifications

• Minimum 5 years of professional software development experience with Java.
• Solid experience with Java frameworks such as Spring and Spring Boot.
• Experience with cloud platforms and containerization.

Responsibilities

• Develop the future versions of the calculation engine for the XiP platform.
• Mentor and guide mid-level developers, providing technical advice.
• Lead the design and development of enhancements to the Risk Calculation Engine.

Skills

Java

Spring

Spring Boot

Quarkus

AWS

Azure

GCP

Docker

Kubernetes

RESTful API design

Agile/Scrum

CI/CD pipelines

Tools

MongoDB

Cassandra

JUnit

Mockito

Job description

Team/Role Overview

We are seeking a Senior Engineer to fill the role of ‘Applications Development Technology Lead Analyst’ on the XiNG large scale distributed calculation platform (XiP).

In this role you will design, build, and maintain the software that manages and controls the XiP platform. This engine is responsible for 500 million risk & suitability calculations at Citi every day. The calculation engine at the core of XiP is both highly performant and rapidly changing to support new scenarios, technologies, and infrastructure.

As an engineer working on XiP, you will work on a platform which daily coordinates hundreds of thousands of pods, consumes tens of thousands of compute cores, utilizes hundreds of TB of memory, and distributes hundreds of millions of calculations.

You will work closely with software engineers, DevOps, and our customers to ensure reliable, secure, and scalable operations of the platform.

Responsibilities

• Take part of the shared responsibility for the long‑term strategic direction of the XiP Platform:

  Apply your experience and skills to develop the future versions of the calculation engine. This means making it faster, utilizing resources better, and scaling to even greater sizes. This means adding new features without impacting performance of the platform in undesirable manner, small changes multiplied by millions of calculations have a high cost. This means solving hard problems like transferring small amounts of data to a huge number of machines.

• Serve as advisor or coach to team members, allocating and overseeing work:

  Mentor and guide mid-level developers, providing technical advice, code reviews, and career development support. Allocate tasks based on skill sets and project priorities, ensuring balanced workloads and timely delivery. Foster a collaborative and growth‑oriented team environment, encouraging best practices and continuous learning.

• Implement changes and improvements to Citi's Risk Calculation Engine, including analyzing and designing improvements to the distribution mechanisms of the engine which regularly parallelizes 250,000 hours of compute into a single 90‑minute execution:

  Lead the design, development, and implementation of enhancements to the Risk Calculation Engine, focusing on optimizing its distribution mechanisms. Analyze current parallelization strategies and identify opportunities to further improve efficiency, scalability, and throughput.

• Operationally support the optimization of Risk calculations by examining and providing SME level insight into the distributed execution of extremely large calculations:

  Monitor and analyze the distributed execution of large‑scale risk calculations, identifying performance bottlenecks and inefficiencies. Provide subject matter expertise to guide operational improvements, leveraging deep technical knowledge to recommend and implement optimizations that enhance calculation speed and resource utilization.

• Plan, coordinate, and execute strategic changes to the engine to reach the next scaling milestone:

  Develop and manage strategic initiatives aimed at scaling the Risk Calculation Engine to meet future business demands. Coordinate with stakeholders to ensure that all scaling efforts are aligned with customer needs.

• Provide specialized customer support to optimize and improve large, distributed calculations.

  Act as a primary point of contact for clients to address issues and optimize inefficiencies that arise during distributed workload execution.

Qualifications

• Minimum 5 years of professional software development experience with Java.
• Solid experience with Java frameworks (e.g., Spring, Spring Boot, Quarkus).
• Exposure to cloud platforms (e.g., AWS, Azure, GCP) and containerization (e.g., Docker, Kubernetes).
• Experience designing, building, and maintaining large‑scale, distributed systems.
• Experience with RESTful API design and implementation.
• Strong understanding of object‑oriented programming and design patterns.
• Exposure to NoSQL databases (e.g., MongoDB, Cassandra) is a plus. Experience with unit testing, integration testing, and test automation frameworks (e.g., JUnit, Mockito).
• Experience working in Agile/Scrum development environments.
• Experience with CI/CD pipelines and DevOps practices is a plus.

By joining Citi Solutions Center Poland, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed) and enjoy a whole host of additional benefits such as:

• Private Medical Care Program
• Life Insurance Program
• Pension Plan contribution (PPE Program)
• Employee Assistance Program
• Paid Parental Leave Program (maternity and paternity leave)
• Sport Card
• Holidays Allowance
• Sport and team recreation activities
• Special offers and discounts for employees
• Access to an array of learning and development resources
• A discretionary annual performance related bonus
• A chance to make a difference with various affinity networks and charity initiatives

Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self every day. We want the best talent around the world to be energized to join us, motivated to stay, and empowered to thrive.

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