Choosing the Right Partner for IBM iSeries AS400 Modernization: What To Look For

Choosing Right Partner for IBM iSeries AS400 Modernization: Understanding the Stakes of AS400 Modernization or Support

Many mid to large-scale enterprises across diverse sectors viz., retail, logistics, manufacturing, or insurance, still rely on the IBM i / AS400 as their backbone system, even if it’s decades old. But what is hard? Maintaining or upgrading it isn’t as simple as just hiring anyone. The wrong consulting partner can:

• Disrupt your day-to-day operations

• Lead to errors or loss of critical business data

• Waste time, money, and internal IT effort

On the other hand, the right consulting team:

• Helps you modernize or support AS/400 without breaking what already works

• Brings in proven tools, methods, and people who understand IBM i inside-out

• Keeps your systems running smoothly while unlocking new business value

So, if you are thinking of upgrading the old green-screen interface, modernizing your database, or outsourcing support to reduce cost and risk, no doubt it all starts with the right partner by your side.

What to Look For – Evaluation Criteria + 10-Point Checklist

A great IBM i consulting partner should do more than “keep the lights on.” They should bring thought leadership, platform fluency, and modernization best practices tailored to your unique workload.

Here’s what you should evaluate:

Strategic Alignment

• Does your partner understand your industry and business model?

• Can they tailor modernization plans to coexist with your operational realities?

Platform Mastery

• RPG III, IV, and free-format expertise

• DDS to DDL conversion track record

• Proficiency with tools like Rational Developer for i (RDi), X-Analysis, Rocket Aldon, LegaSuite, and more

Modernization & Integration Readiness

• Experience with REST API enablement

• Integration with cloud platforms (Azure, AWS)

• Frontend modernization using modern UI frameworks

Support Models & SLAs

• Flexible managed services for ongoing L2/L3 support

• Proven SLA and uptime metrics

• Onshore-offshore blended delivery models

 

10 Key Questions to Ask Your AS400 Partner

1. Do they actively support RPG III, IV, and free-format?

2. Can they show past DDS-to-DDL migration results with performance improvements?

3. What’s their strategy for regression testing and UAT during modernization?

4. How do they handle code remediation for nested legacy modules?

5. What SLAs do they offer for downtime, resolution, and change request handling?

6. Can they demonstrate green-screen to web/mobile transformation projects?

7. Do they support SQL enablement for native DB2 performance tuning?

8. Are tools like Rocket Software or X-Analysis part of their delivery toolkit?

9. Do they provide discovery-to-deployment visibility with milestone tracking?

10. Can they present anonymized client success metrics, not just case studies?

 

How to Evaluate Technical Depth in a Discovery Call

Discovery calls reveal more than capabilities. They uncover intent, maturity, and alignment. Here’s how to probe deeper:

• Ask about edge cases: How would they handle RPGLE code that pulls from outdated APIs? Look for specificity in response.

• Challenge their assumptions: Propose an unsupported scenario, say, AS400 integration with Shopify. See if their answers are grounded in reality or speculation.

• Probe for tooling: Ask which analyzers, testing frameworks, or deployment pipelines they use. Technical depth is often in the tools they standardize.

• Ask for architecture diagrams or modernization roadmaps: Partners who’ve “been there” often have frameworks to show.

Listen for transparency: Do they acknowledge trade-offs, or only promise greenfield results?

 

What Real AS400 Success Looks Like: KPIs That Matter

Anyone can claim AS400 expertise. But only a few can prove it with consistent, measurable outcomes across complex enterprise environments. When evaluating potential partners, look for specific, quantifiable success metrics – not vague statements or inflated claims.

Here are the key performance indicators that separate true IBM i consulting specialists from generalists:

Uptime and Availability Gains

• What to Look For: 99.99%+ uptime guarantees post-modernization or managed services transition

• Why It Matters: Any unplanned downtime on your AS400 platform can grind business operations to a halt, especially in logistics or retail sectors where every second impacts customer experience or revenue.

SLA Adherence & Ticket Resolution Time

• What to Look For: Average SLA compliance rate of 95%+ and first-response times under 30 minutes

• Why It Matters: Legacy support doesn’t mean slow support. A strong partner runs your AS400 like a modern engine with real-time monitoring and agile support models.

Project Delivery Timelines

• What to Look For: Consistently delivered transformation projects within a ±5% variance of committed timelines

• Why It Matters: AS400 projects involve mission-critical systems. Delays impact ERP, inventory, finance, or billing. Precision planning is a hallmark of strong IBM i consultancies.

Business Outcomes

• What to Look For: Proof of impact such as improved order-to-cash cycle times, faster month-end closing, increased throughput, or reduced MIPS costs

• Why It Matters: The right partner doesn’t just modernize technology; they modernize business results.

Client Retention & Repeat Engagements

• What to Look For: High customer retention rate (ideally >85%) and multi-year managed services relationships

Why It Matters: Long-term partnerships speak volumes. Enterprises don’t stick around for vendors; they do for value creators.

 

How United Techno Measures Up – Client Metrics + Tools

At United Techno, we approach AS400 not as a relic to be retired but as a resilient core to be reimagined.

What Sets Us Apart:

• 75+ IBM iSeries developers, with 150+ successful projects across retail, logistics, and healthcare

• Modernization accelerators that reduce manual effort by 35% and testing time by 40%

• Tooling ecosystem: Rocket Aldon, X-Analysis, RDi, Git-based change management, DB2 SQL tooling

• DDS-to-DDL conversion success with real-world performance metrics

• REST API enablement on AS400 to modern cloud endpoints (AWS Lambda, Azure Functions)

• 99.9% uptime SLA for managed support engagements

 

Final Thoughts: Treat AS400 Like the Core Asset

To sum up, it’s crucial to view AS400 as a strategic asset rather than just legacy infrastructure to unlock the full potential of your system. Modernization, when done thoughtfully, can drive business agility, enhance productivity, and safeguard your competitive edge.

• Leverage existing AS400 investments by enhancing and integrating proven systems instead of costly replacements.

• Modernize incrementally with API enablement, cloud connectivity, and automation to future-proof operations.

• Partner with trusted IBM i experts to minimize risk, downtime, and ensure smooth transitions.

• Unlock business insights through advanced analytics on legacy data.

• Maintain compliance and security with up-to-date practices integrated into your IBM i environment.

• Build scalable, resilient architecture designed to support future growth.

Choosing the right IBM i consulting partner is more than an IT decision. It’s a vital business resilience strategy that transforms your AS400 into a core enabler of long-term success.

Ready to discuss your AS400 roadmap? Let’s Talk.