Senior Software Engineer (Kotlin, ReactJS)

About the role

Activate Interactive, a technology consultancy in Singapore, is hiring a Senior Software Engineer (Kotlin, ReactJS) for its Co-Development Business Unit. You will work on a modernisation project for a Singapore government digital service, migrating a legacy stack to a cloud-native, containerised platform on AWS. This is a fixed-term contract of 1 year.

Key responsibilities

• Migrate legacy applications to a modern cloud-native, containerised stack, building products end to end from frontend to backend, infrastructure, security integration and production support.
• Build responsive, accessible web frontends with ReactJS, TypeScript and Next.js.
• Develop backend services and APIs in Golang and/or Kotlin, including long-running business processes with a workflow engine such as Temporal.
• Set up and maintain secure AWS infrastructure using Infrastructure as Code (e.g. Terraform).
• Implement security controls and monitoring, including authentication and identity integration with Singpass, Corppass, OIDC and SAML.
• Build and maintain CI/CD pipelines in GitLab and deploy workloads to Kubernetes (EKS); instrument applications with tools such as Dynatrace or Datadog.
• Support production deployments, troubleshoot issues and take part in incident resolution.
• Define the technical architecture and target state, lead delivery across workstreams, and mentor team members.
• Plan the migration approach, including sequencing, risk management and cutover, and write clean, tested, documented code.

Required profile

• Experience migrating or modernising legacy systems is strongly preferred.
• Experience delivering Singapore Government or public sector projects is an advantage.
• Senior consultant level: proven leadership, stakeholder management and decision-making.

Required skills

• Frontend: ReactJS, TypeScript, Next.js
• Backend: Golang and/or Kotlin
• DevOps: CI/CD, Docker, Kubernetes
• Cloud: AWS architecture and services
• Infrastructure as Code: Terraform (or equivalent)
• Observability: hands-on experience with at least one tool (e.g. Dynatrace, Datadog)
• Workflow engines (e.g. Temporal) and rules engines (e.g. Gorules, Open Policy Agent)
• Identity and security: OIDC, SAML, RBAC, ABAC, Singpass, Corppass, ADFS, CAM, Trend Micro FAM
• Container and infrastructure security practices

What we offer

• Competitive market salary and a variable performance bonus.
• Medical coverage, life and health insurance, and flexible benefits or allowance.
• Wellness support, learning programmes, certification support and a staff development budget.
• Structured career pathways on technical, domain expert or leadership tracks.
• Flexible work arrangements (flexi-place, flexi-time, flexi-load).