Senior Software Engineer 11 month contract Luxembourg 3 days onsite – 2 days remote 387 euros per day You’ve already built integration flows. Now you want to own how they’re designed, how they perform, and how they hold up under pressure. This role gives you that control. You’ll work on complex, business-critical integrations, including SWIFT messaging, where reliability and precision matter. What changes for you You’ll move beyond reactive support into shaping how integration services are built and improved. You’ll design and deploy message flows that actually reduce incidents. You’ll automate manual processes and improve recovery, not just respond to failures. You’ll work across the full lifecycle, from design through to optimisation in production. What you’ll be doing Design, build, test, and deploy message flows using IBM ACE and ITX, including SWIFT MT and MX processing. Analyse systems and integration points to improve how data moves across platforms. Troubleshoot production issues, lead root cause analysis, and implement long-term fixes. Support and maintain IBM ACE, ITX, MQ, and WSO2 Micro-Integrator in Linux environments. Contribute to failover and disaster recovery testing. Automate processes using Ansible and Azure DevOps pipelines. What you need Degree in IT or a related field. Strong hands-on experience with IBM ACE and IBM MQ in real-world environments. Proven experience working with SWIFT message formats (MT and MX). You’ll likely bring experience in IBM ITX and WSO2 Micro-Integrator. Data transformation using XSLT or ESQL. Messaging protocols such as MQ, SFTP, SOAP, REST. Java and SQL. Security standards including OAuth, WS-Security, TLS, SAML or JWT. XML, JSON, and web services development.