Application designer, Software Development

Location: City of London

Application Designer  IBM App Connect Enterprise (ACE)    

The Role   An exciting opportunity has arisen for an  Application Designer specialising in  IBM App Connect Enterprise (ACE)  to join a high-performing technology team within a global financial services environment.
IT sits at the heart of the organisation, driving continuous innovation and delivering reliable, high-quality solutions to support critical business operations. The technology landscape includes  HP Non Stop (Tandem)  systems and a distributed Linux-based messaging and communications infrastructure.
The successful candidate will contribute across the full software development lifecycle, from design through to delivery and support, within a fast-paced and collaborative environment.

Key Responsibilities   You will be responsible for designing, developing and supporting integration and messaging solutions, including:
Producing:  High-Level Application Design documentation
Detailed Technical Design documentation
Program specifications based on design outputs

Developing:  IBM App Connect Enterprise (ACE) code
Deployment scripts and documentation

Testing:  Creating and executing Unit Tests covering all code paths
Producing and executing Sub-system Test plans

Supporting:  Preparing documentation for ongoing application support

Collaborating:  Participating in peer reviews for design, code and testing artefacts
Ensuring quality, completeness and accuracy across deliverables

Technical Environment    Core Technologies     Platforms:  Linux (Red Hat Enterprise Linux)
Integration & Middleware:
IBM App Connect Enterprise (ACE) v12 / v13
IBM Web Sphere MQ v9

Databases:
Oracle 19 (SQL, PL/SQL, data modelling)

Messaging & Data Formats:
MRM, XML, JSON

Integration Exposure    Kafka
HP Non Stop systems
SWIFT connectivity
Required Skills & Experience    Proven experience across the  full software development lifecycle
Strong
** analysis, design and Heres a clean, fully anonymised and market-ready version of the job advert with company identifiers removed and written to attract candidates:
Application Design Analyst  IBM App Connect Enterprise (ACE)    Overview   A leading financial services organisation is seeking an experienced  Application Design Analyst  with strong expertise in  IBM App Connect Enterprise (ACE)  to join a high-performing technology team.
This role sits within a core IT function responsible for developing and supporting mission-critical systems that underpin enterprise-scale transaction processing and messaging infrastructure.
The successful candidate will contribute across the full software development lifecycle, from analysis and design through to build, testing, integration, and support.

Key Responsibilities   You will be responsible for delivering high-quality solutions across a distributed systems environment, including:
Producing  High-Level Application Design documents
Creating  Detailed Technical Design documentation  based on functional and technical requirements
Developing  program specifications  aligned to design outputs
Building and maintaining:  IBM ACE (v12/v13) integrations
Deployment scripts and documentation

Designing and executing:
Unit Test plans  (covering all code paths)
Sub-system and integration testing

Producing support and reference documentation for operational teams
Participating in  peer reviews  to ensure quality, completeness, and accuracy of deliverables
Supporting application integration across messaging and connectivity layers
Technical Environment   You will be working within a modern distributed architecture, including:
Linux (RHEL)  platforms
Messaging and integration technologies
Connectivity with enterprise systems and external financial networks
Required Skills & Experience   Strong experience across the full development lifecycle, with particular strength in  analysis, design, and integration , is essential.
Core Technical Skills      IBM App Connect Enterprise (ACE) v12 / v13
Configuration, development, and administration

Web Sphere MQ (MQ v9+)
Messaging design and implementation

Oracle Database (19c)
SQL, PL/SQL, and data modelling

Messaging formats:
XML, JSON, MRM

Operating systems:
Linux (RHEL)

Programming / scripting (at least one of):
C / C++
SQL
Linux scripting

Desirable Skills    Knowledge of financial messaging standards:
SWIFT ISO 15022 / ISO 20022

Soft Skills & Attributes   We are looking for someone who is:
A  team player , comfortable participating in peer reviews
Able to  mentor and support junior team members
Self-motivated  with the ability to work independently
Detail-oriented with a strong focus on  quality and accuracy
Service-focused  and delivery-driven
Comfortable working in a  fast-paced, dynamic environment
Flexible with a proactive approach to problem solving
Why Apply?
Work on  mission-critical systems  in a complex, high-performance environment
Engage with  modern messaging and integration technologies
Be part of a collaborative team delivering  enterprise-scale solutions