Region
Remote
Description
Working pattern: Home Based
Holiday: 28 days + bank holidays
PMI
Free Parking when on site
The Opportunity
We are recruiting an RPG Developer to join an organisation in the retail distribution and fulfilment sector. This is a high-volume operation where the IBM i (AS400) platform runs the engines behind order management, warehouse execution, inventory accuracy, pricing, and customer billing.
The environment is mature, stable, and heavily relied upon — but it’s not standing still. The business is investing in pragmatic modernisation: increasing automation, improving integration capability, tightening testing and release discipline, and upgrading codebases toward RPG ILE and free-format RPG.
If you enjoy working on mission-critical systems where your code directly impacts real-world operations (and you want to modernise without breaking what works), this is a strong long-term role.
What you’ll be doing
You’ll be hands-on across development, support and continuous improvement, working closely with business stakeholders and technical peers.
Key responsibilities
Develop, enhance and maintain applications on IBM i using RPG (ILE / free-format), ensuring clean structure, reusability and robust error handling.
Work with DB2 for i to design and optimise data access (SQL tuning, indexing, query plans, commitment control).
Support and improve IBM i batch and online processes underpinning operational workflows (orders, inventory, picking, dispatch, invoicing).
Troubleshoot production issues: job logs, message queues, spool files, locking/contention, data integrity defects—driving root cause fixes.
Build and maintain integrations: APIs and services where applicable, plus file-based and partner interfaces (EDI/XML/flat-files/SFTP).
Support formal testing cycles: integration testing, UAT, regression, and performance checks with clear release evidence.
Contribute to release discipline: code reviews, documentation, change impact analysis, and controlled deployments.
Maintain technical documentation and runbooks to improve operational resilience and reduce incident resolution time.
Participate in an out-of-hours support rota when required (paid / controlled / not constant firefighting).
Tech stack (what you’ll be working with)
This role blends strong IBM i fundamentals with a modernisation mindset.
Essential skills
RPG development on IBM i / AS400
Ideally RPG ILE and/or free-format RPG
Modular programming, service programs, binding directories (where applicable)
DB2 for i (SQL, performance thinking, indexing, commitment control)
CL (job control, automation, wrappers, operational scripting)
IBM i operational understanding: libraries, objects, job queues, subsystems, authority concepts, basic troubleshooting
Experience working in structured environments (change control, testing discipline, production stability)
Highly desirable
Modern IBM i patterns/tools: SQLRPGLE, RDi, ACS, source control integration
Integration tooling and formats: REST APIs, JSON/XML, EDI, message/file processing pipelines
Knowledge of Web services on IBM i (HTTP APIs, service programs, API gateways/wrappers)
Batch scheduling and workload control (job descriptions, job logs, performance analysis)
Exposure to modern delivery practices: CI/CD, automated build/deploy scripting, regression automation
Any experience modernising legacy RPG III toward ILE/free-format
What the systems support (business domain)
You’ll work on applications that directly impact trading performance and customer outcomes, including:
Inventory (stock movements, adjustments, replenishment, accuracy controls)
Warehouse processes (pick/pack/ship, dispatch confirmation, scanning feeds)
Billing & Finance interfaces (invoicing, postings, reconciliation outputs)
Carrier/shipping artefacts (labels, manifests, tracking data feeds)
What success looks like in the first 3–6 months
You’ll take ownership of one or more IBM i workflows and become a trusted point of contact for enhancements and incident resolution.
You’ll deliver changes with low defect rates—supported by better regression discipline and clearer documentation.
You’ll improve performance and reliability in at least one high-usage process through DB2 for i tuning and cleaner RPG structure.
You’ll contribute to modernisation: reducing brittle code, introducing reusable service programs, and improving integration boundaries.
What we’re looking for
Commercial experience as an RPG Developer in IBM i / AS400 environments
Strong troubleshooting skills across code + data layers, with a root-cause mindset
Comfortable working with business stakeholders to clarify requirements and deliver stable solutions
A quality-first approach: clean code, testing discipline, documentation, and controlled releases
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