Trading Systems Integration Engineer - FIX 4.4 Expert

CAPCO POLAND *We are looking for 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. Build resilient integration and workflow solutions at the intersection of capital markets, modern technology and digital assets. The Role As a Senior Integration & Workflow Engineer , you’ll provide specialist engineering services focused on designing and developing custom integration and workflow-orchestration components connecting capital markets platforms, blockchain infrastructure and market infrastructure. Design and develop custom integration and workflow-orchestration components connecting capital markets entity’s platforms, Blockchain infrastructure and market infrastructure. The scope includes delivering resilient, secure and auditable services supporting pre-trade validation, transaction orchestration, settlement processing and downstream system integration.. What You’ll Do Design and develop custom middleware and workflow-orchestration services Build REST/API-based integrations with internal and third-party platforms Implement transaction and workflow state management, including multi-step processing across systems Develop orchestration logic for Pre-Trade Gateway, DvP/settlement and downstream integration flows Implement validation, routing, reservation/earmark and transaction-processing logic Develop adapters and integration services for external platforms and market-infrastructure systems Implement idempotency, retry, queueing, replay and recovery patterns for resilient transaction processing Implement asynchronous/event-driven processing where required by detailed architecture Build robust exception handling, error classification and operational status management Implement audit logging, monitoring and traceability across end-to-end workflows Develop data mappings, transformation and canonical integration models Support authentication, authorization, API security and enterprise security requirements Develop automated unit/component tests and support SIT/E2E testing Troubleshoot complex cross-system integration and production issues Support CI/CD, deployment, configuration and production-readiness activities Produce technical documentation and support knowledge transfer/handover Develop and maintain FIX 4.4 message flows and routing logic connecting the existing exchange environment with the DLT/tokenized order flow Implement FIX message mapping, validation, routing, acknowledgements, execution reports, rejects and error handling for tokenized order flows What We’re Looking For Strong hands-on experience developing enterprise integration / middleware applications Strong hands-on experience with FIX 4.4 , including message structures, tags, session management, routing, order lifecycle messages and execution reporting Experience integrating FIX 4.4-based exchange order flows with API/middleware-based downstream systems, including DLT or other non-traditional market infrastructure. Strong development experience in Java / Spring Boot, .NET/C#, Node.js/TypeScript or comparable enterprise technology stack Strong FIX 4.4, REST API and service-integration experience Experience implementing workflow/orchestration or transaction-processing applications Experience with asynchronous processing, messaging and event-driven patterns such as Kafka, MQ or equivalent Strong understanding of distributed-system patterns including idempotency, re-tries, timeouts, circuit breakers, concurrency and failure recovery Experience with relational databases and persistent transaction/state management Experience integrating with third-party/vendor APIs Experience with secure enterprise application development, authentication/authorization and audit logging Experience with Git, CI/CD, automated testing and modern deployment practices Strong troubleshooting skills across distributed applications and interfaces Domain & Industry Experience Financial services integration experience, particularly capital markets, payments, trading or settlement Experience with financial-market messaging standards Experience developing transaction orchestration in regulated/high-availability environments Exposure to blockchain/DLT, digital assets, smart assets or custody platforms is preferred We offer a flexible collaboration model based on a B2B contract, with the opportunity to work on diverse projects. Recruitment Process: HR Interview with the recruiter Technical Interview Client Interview Feedback and offer #LI-HYBRID