Job details:

• Role: Senior Java Engineer / Solution Architect 
• Full-time
• Hybrid, 8 times a month in Krakow office
• Start date: ASAP
• End date: 31/12/2026

Scope:

• Analyze the existing monolithic trading platform and propose a pragmatic service decomposition strategy.
• Identify logical service boundaries based on business capabilities such as: Trade capture, Trade validation and approvals, Trade affirmation, Trade lifecycle management, Valuation, Termination and maturity processing, Settlement, Reporting and state visibility
• Support the transition from a tightly coupled monolith to a service-oriented or microservices-based architecture.
• Design communication patterns between services and external systems using REST APIs, messaging, queues, or Kafka where appropriate.
• Define data ownership principles and decide which services should own their own databases.
• Propose strategies for database synchronization, eventual consistency, data replication, and avoiding dependency on a central “golden source” database.
• Design resilient failure-handling mechanisms across distributed services.
• Define approaches for monitoring, observability, auditability, and visibility of system state.
• Address scalability challenges, including duplicate message processing, idempotency, concurrency control, and horizontal scaling.
• Collaborate with business analysts, developers, architects, QA engineers, and production support teams.
• Help ensure the new architecture supports performance, reliability, regulatory requirements, and operational stability.

Skills:

• Strong commercial experience with Java and the Spring Framework.
• Experience working with large, complex legacy systems, ideally monolithic applications.
• Good understanding of distributed systems architecture.
• Practical experience with REST APIs, SOAP web services, and system integrations.
• Strong database experience, preferably with Oracle.
• Understanding of service decomposition, bounded contexts, domain-driven design, or similar architectural approaches.
• Experience designing systems with asynchronous communication using queues, Kafka, or other message brokers.
• Knowledge of transaction handling, eventual consistency, retry mechanisms, dead-letter queues, and failure recovery.
• Experience with observability concepts such as logging, monitoring, tracing, correlation IDs, and operational dashboards.
• Understanding of scalability patterns, including idempotent processing and duplicate message prevention.
• Ability to evaluate trade-offs between synchronous REST communication and asynchronous messaging.
• Strong analytical and problem-solving skills.
• Ability to communicate architectural decisions clearly to both technical and non-technical stakeholders.

Nice to have:

• Experience in investment banking, capital markets, or trading systems.
• Knowledge of swaps, FRAs, trade lifecycle events, settlements, or valuations.
• Experience with C++ integration or modernization.
• Experience with Kafka, MQ, RabbitMQ, or similar messaging technologies.
• Experience migrating legacy financial platforms to cloud-native or containerized environments.
• Experience with high-availability systems and production-critical platforms.

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