[Hiring] Senior Software Engineer @IRIS

Role Description

This is a hands-on senior engineering role where you’ll solve complex problems, build scalable cloud-based software and have genuine influence over how we design and deliver our products. You’ll work across modern .NET, C#, cloud and web technologies, helping us create secure, reliable software capable of supporting large numbers of users.

As a Senior Software Engineer, you’ll take ownership of significant areas of our products from initial design through to production. You’ll:

• 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.

Qualifications

• 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.

Requirements

• 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.

Benefits

• Your work will influence millions globally.
• Continuous learning and career development opportunities.
• A culture that celebrates diversity and empowers every individual.

Company Description

IRIS Software Group is one of the UK's largest privately held software companies, trusted by 100,000+ businesses, schools and accountancy firms to keep their operations running. Our software pays 1 in 6 UK employees, supports over 12,000 schools, and is relied on by 91 of the top 100 UK accountancy firms.

We're a Great Place to Work® certified employer, recognised for our commitment to well-being, inclusion and development - and we're growing fast.