Solution Technical Architect AS400

Unison Group

Singapore, Singapore, Singapore contract

Posted: April 17, 2026

Required Skills

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

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