Trading Systems Integration Engineer - FIX 4.4 Expert
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Job description
About the Position
Trading Systems Integration Engineer - FIX 4.4 Expert
Poland - Warsaw
CAPCO POLAND
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.
Build resilient integration and workflow solutions at the intersection of capital markets, modern technology, and digital assets.
Responsibilities
- 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
Requirements
- 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, retries, 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
Nice to Have
- 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
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
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CAPCO POLANDCapco Poland is a global technology and management consultancy specializing in driving digital transformation across the financial services industry. We are passionate about helping our clients succeed in an ever-changing industry.Joining Capco means joining an organization committed to an inclusive working environment where you’re encouraged to #BeYourselfAtWork. We celebrate individuality and recognize that diversity and inclusion, in all forms, are critical to success.We also are:-> Experts in Java, Angular, React, Mobile (Android & iOS), Big Data, DevOps, Cloud (AWS, GCP, Azure), Murex, QA-> Focused on development, automation, innovation, and long-term projects in financial services-> Committed to providing development opportunities, project continuity and professional coaching to our employees