Java Software Engineer - Financial Markets

ING Hubs Poland; Katowice; On-site; PLN 60,000 - 90,000; Full time

Job summary

ING Hubs Poland is looking for a talented Engineer III or IV to join its high-impact engineering team in Katowice. You will develop robust backend services central to the trading lifecycle and enhance system performance in a dynamic environment.

The ideal candidate has over 5 years of experience in production-grade software development, strong Java and Spring Boot skills, and a solid understanding of financial markets. Collaboration with traders and business experts is essential.

Qualifications

• 5+ years of experience building and maintaining production-grade software.
• Strong foundations in algorithms, data structures, design patterns, and concurrency.
• Proven ability to build modular, testable, and maintainable systems.

Responsibilities

• Design and develop robust backend services and expose them via modern REST APIs.
• Continuously improve architecture, scalability, and infrastructure.
• Enhance performance, reliability, and system resilience in production environments.
• Collaborate closely with business experts, traders, and quants to deliver complex features.
• Apply and promote high-quality engineering practices, including automated testing.

Skills

Java

Spring Boot

Git

SQL

Problem-solving mindset

Analytical thinking

English (written and spoken)

Knowledge of equity derivatives

Education

MSc in Computer Science or equivalent practical experience

Tools

CI/CD pipelines

Market data APIs (e.g., Bloomberg B-Pipe)

Job description

Join a high-impact engineering team delivering cutting‑edge solutions for Financial Markets. We build systems used daily by sales teams, traders, and risk managers across global hubs: London, Amsterdam, Brussels, New York, and Singapore.

Our focus is on derivative products across multiple asset classes (equities, commodities, interest rates). You will contribute to platforms that automate the full trading lifecycle - from client quote requests to pricing, booking, and risk management - in highly dynamic, real‑time environments.

This is a unique opportunity to work at the intersection of technology, finance, and global collaboration, where your work directly influences business decisions.

Your responsibilities:

• Design and develop robust backend services and expose them via modern REST APIs
• Continuously improve architecture, scalability, and infrastructure, including CI/CD pipelines
• Enhance performance, reliability, and system resilience in production environments
• Collaborate closely with business experts, traders, and quants to deliver complex features
• Apply and promote high‑quality engineering practices, including automated testing
• Proactively identify, troubleshoot, and resolve issues, ensuring long‑term stability

We are looking for you, if you have:

• MSc in Computer Science or equivalent practical experience
• 5+ years of experience building and maintaining production‑grade software
• Strong foundations in algorithms, data structures, design patterns, and concurrency
• Proven ability to build modular, testable, and maintainable systems
• Hands‑on expertise in Java, Spring Boot, Git, and SQL
• Strong analytical thinking and a problem‑solving mindset
• Good command of English (written and spoken)
• Knowledge of equity derivatives or trading concepts
• Experience in financial markets or fintech environments
• Familiarity with market data providers and APIs (e.g., LSEG / RFA, Bloomberg B‑Pipe)

The role naming convention in the global ING job architecture will be “Engineer III" or "Engineer IV".