Solution Technical Architect AS400

Unison Consulting Pte Ltd

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Singapore, Singapore, Singapore on site Until 8/23/2026 First posted April 17, 2026 Last posted April 17, 2026
Job description

Role Overview

We are looking for an experienced Solution / Technical Architect to lead large-scale legacy modernization initiatives, specifically migrating AS400/Mainframe systems to Java-based Microservices architecture. The ideal candidate will have deep expertise in designing scalable, cloud-native solutions and hands-on experience in end-to-end transformation programs.

Key Responsibilities

  • Lead architecture and design for AS400/Mainframe to Java Microservices migration programs
  • Analyze existing legacy systems (RPG, COBOL, CL, DB2) and define modernization strategy
  • Design target architecture using Java, Spring Boot, Microservices, and APIs
  • Define migration approach: re-platforming, re-hosting, refactoring, or re-engineering
  • Drive domain decomposition and microservices design aligned with business capabilities
  • Collaborate with business stakeholders, product owners, and engineering teams
  • Ensure high availability, scalability, and performance in the new architecture
  • Define integration patterns using Kafka, REST APIs, event-driven architecture
  • Lead data migration strategy (DB2 to modern databases like PostgreSQL/Oracle)
  • Ensure adherence to security, compliance, and enterprise architecture standards
  • Provide technical leadership, governance, and mentorship to development teams
  • Support testing, deployment, and production rollout

Required Skills & Experience

  • 12+ years of IT experience with strong architecture background
  • Proven experience in AS400/Mainframe modernization projects
  • Hands-on expertise in:
    • AS400 / Mainframe (RPG, COBOL, JCL, DB2)
    • Java, Spring Boot, Microservices architecture
    • API design and integration
  • Experience with cloud platforms (AWS / Azure / GCP)
  • Strong understanding of event-driven architecture (Kafka preferred)
  • Experience with containerization (Docker, Kubernetes)
  • Strong knowledge of data migration and transformation strategies
  • Experience in banking / payments / financial services domain is highly preferred
About this role

Summary

Lead AS400 modernization, design scalable microservices, and oversee migration strategies.

Job title

Solution Technical Architect AS400

Experience level

12+ years

Industry

software

Location requirements

Singapore, Singapore, remote work not specified

Salary

Not specified

Management role

No

Skills & keywords

Required skills

AS400MainframeRPGCOBOLJavaSpring BootAPIsKafkaDockerdata migration

Preferred skills

cloud platformsmicroservicesAPI designAWSKubernetes

Specializations

legacy modernizationmicroservicescloud-native
Locations

Structured locations inferred from the posting.

Alexandra, Singapore

On-site City