Rapsys Technologies Hiring! Full Time Senior Solution Architect - Senior Technical Lead (Java -.NET) in - Ricebowl

Job Summary

We are seeking an experienced Senior Solution Architect / Technical Lead to lead the architecture, design, and delivery of mission-critical enterprise applications for the Defence sector. This role is responsible for driving enterprise architecture, technical governance, cloud-native modernization, AI-assisted software engineering, DevSecOps practices, and engineering excellence across large-scale government projects.

The ideal candidate possesses deep expertise in Java and/or Microsoft .NET technologies, modern cloud-native platforms, secure software engineering, AI-powered development tools, and enterprise solution architecture within highly regulated environments. You will lead high-performing engineering teams while ensuring scalable, secure, resilient, and maintainable solutions that align with government engineering standards.

Key ResponsibilitiesEnterprise Architecture

• Define enterprise application architecture aligned with DSTA engineering standards.
• Design secure, scalable, resilient, and highly available enterprise solutions.
• Lead architecture reviews and technical governance activities.
• Produce High-Level Designs (HLD), Low-Level Designs (LLD), Architecture Decision Records (ADR), and technical roadmaps.
• Design API-first, Microservices, and Event-Driven architectures.
• Lead modernization initiatives for legacy enterprise systems.
• Ensure architecture compliance with government security and engineering standards.

Technical Leadership

• Lead cross-functional engineering teams of 10–30 developers.
• Establish software engineering standards, best practices, and coding guidelines.
• Drive code quality through reviews, automation, and continuous improvement.
• Mentor Solution Architects, Technical Leads, and Senior Developers.
• Conduct architecture and design reviews.
• Troubleshoot and resolve complex technical and production issues.
• Support Agile/Scrum delivery and technical planning.

AI-Assisted Software Engineering (Mandatory)

Leverage AI-powered software engineering tools to improve developer productivity and software quality.

Experience with AI development tools such as:

• GitHub Copilot Enterprise
• Claude Code
• OpenAI Codex
• Cursor IDE
• Amazon Q Developer
• JetBrains AI Assistant
• *************
• Windsurf
• Sourcegraph Cody

Practical experience in:

• AI-assisted code generation
• Automated test generation
• Code refactoring
• AI-powered code reviews
• Documentation generation
• Architecture generation
• Unit test creation
• Security scanning
• AI-assisted debugging
• Prompt engineering
• AI pair programming
• Agentic software development workflows
• Vibe Coding methodologies
• AI coding governance

Technical SkillsBackend DevelopmentJava

• Java 17+
• Spring Boot
• Spring Cloud
• Spring Security
• Hibernate
• JPA
• Maven
• Gradle
• JUnit
• Mockito

Microsoft .NET

• .NET 8
• ASP.NET Core
• C#
• Entity Framework Core
• Minimal APIs
• Blazor
• Web API
• LINQ
• NUnit
• xUnit

Frontend

• React
• Angular
• Vue.js
• TypeScript
• HTML5
• CSS3
• Bootstrap
• Material UI

API & Integration

• REST APIs
• GraphQL
• gRPC
• OpenAPI
• Swagger
• Kong API Gateway
• WSO2
• Apigee
• NGINX

Event Streaming

• Apache Kafka
• RabbitMQ
• IBM MQ
• ActiveMQ
• Azure Service Bus

Databases

• PostgreSQL
• Microsoft SQL Server
• Oracle
• MySQL
• MongoDB
• Redis
• Elasticsearch

Cloud Platforms

Experience with one or more:

• Microsoft Azure
• AWS
• Red Hat OpenShift
• Kubernetes
• Docker

DevSecOps (Mandatory)CI/CD

• GitHub Actions
• Azure DevOps
• Jenkins
• GitLab CI

Source Control

• Git
• GitHub Enterprise
• Bitbucket

Infrastructure as Code

• Terraform
• Ansible
• Helm
• Kustomize

Container Platforms

• Kubernetes
• OpenShift
• Docker

Observability

• Prometheus
• Grafana
• Datadog
• ELK Stack
• Splunk

Secure Software Engineering

Strong understanding of:

• OWASP Top 10
• OWASP ASVS
• Secure SDLC
• Threat Modeling
• SAST
• DAST
• Software Composition Analysis (SCA)
• Secrets Scanning
• Infrastructure-as-Code Security
• Container Security
• SBOM
• Dependency Management
• Zero Trust Architecture
• OAuth2
• OpenID Connect (OIDC)
• JWT
• PKI
• Mutual TLS (mTLS)

AI Engineering (Preferred)

Experience with:

• OpenAI APIs
• Azure OpenAI
• Claude APIs
• MCP (Model Context Protocol)
• AI Agents
• LangChain
• LangGraph
• Semantic Kernel
• Vector Databases
• Retrieval-Augmented Generation (RAG)
• Prompt Engineering
• AI Guardrails
• AI Security
• Agentic AI
• AI Gateway
• LLM Observability

Architecture Expertise

• Microservices Architecture
• Event-Driven Architecture
• Domain-Driven Design (DDD)
• Clean Architecture
• Hexagonal Architecture
• CQRS
• Saga Pattern
• Service Mesh
• API Gateway
• Enterprise Integration
• Distributed Systems
• High Availability
• Disaster Recovery

Government / Defence Experience (Highly Preferred)

Hands-on experience delivering enterprise solutions for:

• DSTA
• MINDEF
• GovTech
• Home Team
• CSA
• HTX
• Other Singapore Government Agencies

Knowledge of:

• Government procurement processes
• Government engineering governance
• Public Sector SDLC
• Government security policies
• Secure deployment environments
• Mission-critical systems
• Defence engineering lifecycle

DSTA Technical Experience (Preferred)

Experience with:

• Azure Government Cloud / GCC
• Azure Kubernetes Service (AKS)
• Azure API Management
• Azure DevOps
• Azure Functions
• Azure Logic Apps
• Azure Service Bus
• Azure Event Grid
• Azure Key Vault
• Microsoft Graph API
• Microsoft Entra ID (Azure AD)
• Application Insights
• Microsoft Defender for Cloud
• Microsoft Sentinel
• SQL Always On
• OpenShift Container Platform (OCP)
• Windows Server
• Linux (RHEL)

Engineering Excellence

Experience driving:

• Architecture Review Boards
• Technical Governance
• Engineering KPIs
• Quality Gates
• Coding Standards
• Technical Debt Reduction
• Performance Engineering
• Capacity Planning
• Release Governance
• Production Readiness Reviews

Required Qualifications

• Bachelor's degree in Computer Science, Engineering, or a related discipline.
• 12–18+ years of enterprise software engineering experience.
• Minimum 5 years of experience as a Solution Architect or Technical Lead.
• Proven experience delivering enterprise-scale solutions within government, defence, or highly regulated industries.
• Strong hands-on coding capability in Java and/or .NET (not purely managerial).
• Experience leading Agile/Scrum delivery teams.
• Excellent communication, stakeholder management, and leadership skills.

Preferred CertificationsMicrosoft

• Azure Solutions Architect Expert
• Azure Developer Associate
• Azure AI Engineer Associate
• Azure DevOps Engineer Expert

Cloud

• AWS Solutions Architect – Professional
• AWS Developer Associate
• Red Hat OpenShift Certification
• Certified Kubernetes Administrator (CKA)
• Certified Kubernetes Application Developer (CKAD)
• Kubernetes and Cloud Native Associate (KCNA)

Security

• CISSP
• CCSP
• CCSK
• Certified DevSecOps Professional
• GIAC Cloud Security

Architecture

• TOGAF
• Zachman Framework
• ArchiMate

Nice-to-Have Skills

• Platform Engineering
• Internal Developer Platforms (IDP)
• Backstage
• Crossplane
• ArgoCD
• FluxCD
• Dapr
• Istio
• Kong Gateway
• NGINX
• Redis Enterprise
• Apache Ignite
• AI Coding Governance
• FinOps
• Green Software Engineering
• Chaos Engineering
• Performance Engineering
• Digital Twin Architectures
• Site Reliability Engineering (SRE)
• Low-Code Platforms (Power Platform, Mendix, OutSystems)

Key Competencies

• Enterprise Solution Architecture
• Technical Leadership
• Cloud-Native Development
• AI-Assisted Software Engineering
• DevSecOps & Secure SDLC
• Government & Defence Systems
• Stakeholder Management
• Architecture Governance
• Team Mentoring
• Strategic Decision-Making
• Problem Solving
• Executive Communication
• Cross-Functional Collaboration

Experience:

• enterprise software engineering : 1 year (Required)
• Solution Architect : 5 years (Required)
• Technical Lead: 5 years (Required)
• Java: 5 years (Required)
• .NET: 6 years (Required)

Work Location: In person