Senior Java Engineer (low - latency Trading Systems) (she/ He/ They)

Senior Java Engineer (Low-Latency Trading Systems)

We are looking for a Poland based candidate. At Capco Poland, we're not just another consultancy - we're the spark behind digital transformation in the financial world. As a global leader in technology and management consulting, we thrive on helping clients tackle the toughest challenges across banking, payments, capital markets, wealth, and asset management.

PROJECT OVERVIEW:

The team is working on extending Client's existing, business-critical equities trading system. The system is a low-latency, Java-based trading platform covering the full trading lifecycle and operating under strict performance and stability requirements. The platform covers the full equities trading lifecycle within a fully real-time, latency-sensitive environment. It includes market data ingestion and processing, pricing and quoting, order entry and order management (OMS), execution and smart order routing (SOR/EMS), pre-trade risk checks, and post-trade enrichment and reporting. All components operate without batch processing, ensuring continuous, low-latency performance across the system. From a business standpoint, the platform supports core Front Office functions including trading, execution, and order management, with a strong focus on equities and complex financial instruments. Engineers collaborate closely with Front Office–aligned IT teams, contributing to systems that are critical to trading operations while requiring solid domain understanding of capital markets products and workflows.

ROLE OVERVIEW:

We're looking for a Senior Java Engineer with proven experience building low-latency, event-driven systems in complex environments. You will design, develop, and optimize performance-critical components within a microservices-based trading platform using Java 17 and Spring Boot, working with messaging technologies and modern architectural patterns such as CQRS and ring buffer concepts. The role requires strong ownership, the ability to ramp up quickly in an established codebase, and a DevOps mindset within an Agile setup. Experience with JVM performance tuning and high-throughput systems is highly valued.

KEY RESPONSIBILITIES:

• Design, develop, and extend low-latency Java components within the trading platform
• Implement new features across the trading lifecycle
• Optimize performance and latency-critical paths
• Collaborate with a designated Technical Lead / Architect
• Contribute to system stability, scalability, and maintainability
• Work in an Agile / Scrum setup across multiple thematic streams

REQUIRED SKILLS & QUALIFICATIONS:

• 7+ years of experience in software engineering with Java
• Proven experience in low-latency trading or execution systems
• Strong understanding of event-driven architectures
• Ability to work independently in complex, high-performance environments
• Comfortable ramping quickly in an established codebase and architecture

TECHNICAL STACK & ARCHITECTURE:

• Java 17
• Frameworks / libraries:
• Spring Boot
• Selective use of Hibernate
• Messaging:
• Solace
• Architecture:
• Microservices
• Event-driven
• Ring buffer patterns, sequencer concepts, CQRS
• CI/CD:
• GitLab
• Jenkins
• Infrastructure:
• Hybrid setup with Azure

We offer a flexible collaboration model based on a B2B contract, with the opportunity to work on diverse projects.

RECRUITMENT PROCESS:

1. HR interview with the recruiter
2. Technical interview with Capco Engineering team
3. Client interview
4. Feedback and offer