Top 10 Best As400 Services of 2026

Profound Logic is built for IBM i operations and application change where production stability, workload predictability, and controlled deployments are part of the deliverable. The operating approach ties engineering tasks to operational artifacts so teams can track changes across environments and reduce reliance on tribal knowledge. Engagement work commonly spans integration enablement for existing programs and migration activities that move data and interfaces with minimal downtime exposure.

A key tradeoff is that work artifacts and operational alignment take time, which can slow early experimentation compared with teams that only need short-term advisory time. A strong usage situation is an IBM i estate that must support ongoing change while adding API enablement or EDI integration and keeping batch schedules and job queues stable.

NTT DATA fits organizations that run mission-critical IBM i workloads with strict availability expectations and need coordination across operations, integration, and development delivery. The engagement approach typically organizes work around operational transition, steady-state monitoring, and controlled release processes for application and interface changes. API enablement and web service integration work tend to be delivered as part of modernization programs rather than as standalone tooling.

A key tradeoff is that managed services outcomes depend on client readiness for requirements, environment access, and change approval workflows. NTT DATA is a strong fit for scheduled modernization waves where existing RPG IV and interface-heavy applications must be updated while keeping business calendars stable.

CNX Corporation fits teams that need hands-on IBM i engineering rather than only advisory work, since its delivery model includes operational support and implementation staffing for real workload changes. The engagement workflow is usually structured around intake, impact analysis, and change execution across application and infrastructure boundaries that affect daily IBM i operations. Where integration is part of the scope, CNX Corporation’s work tends to focus on reliable data movement between IBM i and external systems to support EDI and web services style interfaces.

A key tradeoff is that CNX Corporation’s strongest fit is in IBM i focused delivery, so organizations seeking broad platform coverage beyond IBM i may need additional vendors. CNX Corporation is well suited for modernization support where new interfaces must coexist with existing RPG IV and RPGLE code while reducing production downtime risk.

Fresche Solutions delivers IBM i and AS/400 modernization support with a focus on integration work across legacy and newer channels. Its core engagement pattern centers on application lifecycle services that cover RPG IV and RPGLE change work, data access improvements, and system integration for operational continuity.

Fresche Solutions also supports data movement and migration efforts tied to DB2 for i and related IBM i artifacts to reduce breakage during change. For teams that need repeatable delivery for IBM i environments rather than one-off fixes, its delivery emphasis maps to ongoing modernization programs.

IBM Consulting delivers managed and transformation services for IBM i estates running on Power Systems, including modernization work on legacy applications. Engagements often combine application work with infrastructure operations such as performance tuning, availability design, and disaster recovery planning for IBM i workloads.

Delivery teams typically map modernization tasks across RPG IV, RPGLE, CL programming, DB2 for i, and integration pathways like EDI and web services. Governance support tends to focus on operational controls, change management, and auditability across the IBM i lifecycle.

Wipro is a global systems and engineering services firm with established delivery teams for IBM i environments and Power Systems estates. It supports AS400 modernization work that combines application and data integration, including migration planning and coordinated cutover to newer runtime targets.

Its core IBM i service portfolio typically spans RPG and SQL-centric application maintenance, EDI and batch integration, and operational hardening for journaling and recovery workflows. Delivery governance is geared toward enterprise change control rather than small-team experimentation.

Seiden Group is an IBM i services provider focused on end-to-end delivery around Power Systems estates, from assessment through modernization execution. Teams get hands-on work that typically covers RPG IV and RPGLE application maintenance, DB2 for i data changes, and migration support for dependent interfaces. The practical emphasis centers on integration work where OS-level behavior, batch scheduling, and job control details matter for predictable outcomes.

CGI provides managed IBM i services focused on running and modernizing Power Systems estates, with delivery built around migration programs, operational support, and application engineering. Delivery teams typically cover application work that includes RPG IV and free-form RPG modernization paths, plus database and integration tasks around DB2 for i.

CGI also brings automation for platform operations through managed processes that control change and incident handling across multiple IBM i environments. For AS/400 modernization, CGI is most relevant when governance, hands-on engineering, and integration delivery need to be coordinated under one services team.

HCLTech delivers managed IBM i services for Power Systems environments, including modernization, migration, and ongoing operations. Delivery centers on application support for RPG IV and RPGLE workloads, plus data work for DB2 for i and dependent integrations.

Automation and control are reflected in its run-and-change approach for batch scheduling, incident response, and environment governance across IBM i estates. Service coverage is oriented around integration projects that connect IBM i applications with enterprise channels using middleware and API-oriented patterns.

Kyndryl is a global managed-services and infrastructure integrator that can support IBM i environments across planning, build, and ongoing operations. Its delivery model is centered on managed IBM i services and platform modernization workstreams that connect Power Systems operations with application and data change.

Governance is handled through enterprise service management practices that typically include change control, incident workflows, and operational reporting. Kyndryl is distinct among IBM i service providers that focus on end-to-end accountability from migration design through steady-state run operations.