# Trading Systems Integration Engineer - FIX 4.4 Expert at Capco

Trading Systems Integration Engineer - FIX 4.4 Expert at Capco in Poland - Warsaw. Hybrid. Posted September 14, 2026.

- Company: Capco
- Location: Poland - Warsaw
- Workplace: Hybrid
- Posted: 2026-09-14
- Apply: https://job-boards.greenhouse.io/capco/jobs/8201240
- Source: https://jobmagic.ai/jobs/trading-systems-integration-engineer-fix-44-expert-capco-bht4fa

## 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, 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

## Description

**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

 

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