Solution Architect - AS400/Mainframe to Microservices Migration

Unison Group

Singapore, Singapore, Singapore permanent

Posted: April 17, 2026

Required Skills

Job Description

Role Overview

We are looking for a Solution/Technical Architect with strong experience in migrating legacy AS400/Mainframe systems to modern Java-based microservices architecture. The role involves driving end-to-end architecture, modernization strategy, and implementation for large-scale enterprise systems.

Key Responsibilities

• Define target architecture for Mainframe/AS400 to Java microservices migration
• Design scalable, resilient, and cloud-native solutions
• Assess legacy systems and define migration strategy (rehost, refactor, re-architect)
• Lead decomposition of monolithic applications into microservices
• Define API, integration, and data flow architecture
• Ensure smooth migration with minimal business disruption
• Drive adoption of Java, Spring Boot, REST APIs, and microservices best practices
• Implement containerization and orchestration (Docker, Kubernetes)
• Define data migration, transformation, and reconciliation strategies
• Design event-driven and messaging-based architectures (Kafka, MQ)
• Collaborate with business and technical stakeholders
• Provide technical leadership and mentor development teams
• Conduct architecture reviews and ensure governance standards
• Ensure security, scalability, and performance of solutions

Requirements:
Required Skills

• Strong experience in AS400/Mainframe systems
• Proven experience in legacy system modernization and migration
• Expertise in Java, Spring Boot, and Microservices architecture
• Experience with REST APIs and distributed systems
• Knowledge of Docker, Kubernetes, and cloud platforms (AWS/Azure/GCP)
• Strong understanding of data migration and system integration

Preferred Skills

• Experience in Banking/Financial Services domain
• Knowledge of messaging systems (Kafka, IBM MQ)
• Familiarity with DevOps tools and CI/CD pipelines
• Exposure to Agile methodologies

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