Senior Integration Developer (IBM ACE / IIB) - Banking

About the role

We are seeking an experienced Senior Integration Developer to join a high‑performing engineering team delivering enterprise integration and messaging solutions for a complex financial services environment. You will design, develop and maintain high‑performance integration services that support large‑scale transaction processing, working across the full software development lifecycle.

Key responsibilities

• Design and develop integration solutions using IBM App Connect Enterprise (ACE) and IBM Integration Bus (IIB).
• Produce detailed technical designs and specifications from functional requirements.
• Develop, test, and deploy integration services and message flows.
• Configure and develop solutions using IBM MQ / WebSphere MQ.
• Create deployment documentation and automated deployment scripts.
• Develop and execute unit and subsystem test plans.
• Support production deployments and troubleshoot issues.
• Participate in code reviews, design reviews and technical discussions.
• Perform proof‑of‑concepts to validate performance and throughput.
• Collaborate within Agile delivery teams to deliver solutions on time.

Required profile

• Strong commercial experience with IBM ACE v12 or IBM IIB v10+.
• Experience developing and supporting IBM MQ / WebSphere MQ solutions.
• Proficient in SQL and PL/SQL with Oracle databases.
• Good knowledge of Oracle database design.
• Familiarity with Linux (RHEL) environments.
• Experience with XML and JSON message formats.
• Understanding of enterprise integration and messaging architecture.
• Full‑cycle software development lifecycle experience.
• Excellent analytical and problem‑solving abilities.

Required skills

• IBM App Connect Enterprise (ACE)
• IBM Integration Bus (IIB)
• IBM MQ / WebSphere MQ
• SQL
• PL/SQL
• Oracle Database
• Linux (RHEL)
• XML
• JSON

What we offer

• Hybrid working model – 8 days onsite per month, remainder remote.
• Day rate of £500‑£600 via umbrella company.