Senior Software Engineer - US

IRIS Software Group is hiring a Senior Software Engineer to design, build, and support scalable cloud-based software. The role owns significant product areas end-to-end, influences architecture and engineering practices, and mentors other engineers.

Responsibilities:

• Design and deliver complex, scalable systems, including high-traffic APIs, multi-service integrations and data-processing solutions
• Own large features and components end-to-end, from technical design and development through to deployment and production support
• Build modern applications using C#, .NET Core, ASP.NET Core Web APIs and contemporary frontend technologies
• Influence architecture and technology decisions, helping the team choose solutions that balance scalability, maintainability and business needs
• Build and improve cloud-native solutions across Azure or AWS
• Champion strong engineering practices including automated testing, TDD/BDD, CI/CD, observability, security and Infrastructure as Code
• Work closely with Product, QA, Design, DevOps and other Engineering teams to turn requirements into high-quality software
• Lead technical discussions, story refinement and technical problem-solving
• Identify opportunities to reduce technical debt and improve existing systems
• Troubleshoot complex production and performance issues
• Mentor junior and mid-level engineers, sharing knowledge and helping others develop technically
• Help the team use AI-assisted engineering tools responsibly and effectively to improve quality, productivity and decision-making

Requirements:

• 5 to 7 years of professional software development experience
• Strong backend development experience using .NET Core, C#, ASP.NET Core Web APIs and REST
• Experience working with application architectures and distributed systems
• Strong knowledge of SQL, NoSQL and data architecture
• Experience with modern frontend frameworks such as Angular, React, Vue.js or Blazor, or working knowledge of frontend development alongside deeper backend expertise
• Strong Azure or AWS experience within SaaS environments
• Experience with cloud technologies such as Azure Functions, Queues, Blob Storage and VMs, or AWS equivalents including Lambda, SQS/SNS and EC2
• Experience with Docker and/or Kubernetes, ideally including production-scale deployments using AKS or EKS
• Experience with Infrastructure as Code, using tools such as Terraform, Bicep, ARM Templates, AWS CloudFormation or CDK
• Strong understanding of CI/CD, deployment strategies and engineering automation
• Experience with automated testing and TDD/BDD practices
• Understanding of clean architecture, SOLID principles and domain-driven design
• Experience building highly scalable, internet-facing software
• Strong production troubleshooting skills, including application profiling, benchmarking and performance optimisation
• Knowledge of observability platforms such as DataDog, Application Insights or Amazon CloudWatch
• Good understanding of application security, vulnerability management and threat modelling
• Ownership of complex, multi-system solutions
• Experience working on scalable, internet-facing products
• Technical leadership through architecture decisions, mentoring and collaboration
• The confidence to challenge and influence technical decisions constructively
• A track record of improving engineering standards and practices
• Experience mentoring junior and mid-level engineers
• The ability to lead technical initiatives spanning multiple sprints or quarters
• Strong communication skills, including explaining technical decisions to non-technical colleagues
• You don't need formal management experience. We're looking for someone who can lead through technical expertise and influence while remaining genuinely hands-on
• Working in regulated or complex environments such as finance, health or government technology
• Using prompt engineering and Model Context Protocol (MCP) to connect AI systems with tools and services
• Advanced DataDog/APM, dashboards and alerting
• Modern UI architecture such as micro-frontends, SSR or SSG
• Security technologies and standards including OAuth2, OIDC and RBAC
• Event-driven architectures
• GraphQL, SignalR or WebSockets
• DevOps automation and true end-to-end ownership of software in production
• Advanced Azure or AWS certifications