Senior Software Engineer

Salary: £13,000 - 49,000 per year

Requirements:

• 5–7 years of professional software development experience.
• Strong proficiency with .NET Core, C#, ASP.NET Core Web APIs, REST, application architectures, and distributed systems.
• Strong proficiency with a modern UI framework such as Angular, React, Vue.js, or Blazor, including performance optimization and component architecture; alternatively, working knowledge with a backend specialization.
• Strong knowledge of SQL, NoSQL, and data architecture decisions.
• Experience delivering complex, multi-system solutions and highly scalable, internet-facing products serving millions of users.
• Demonstrated technical leadership through architecture decisions, technical mentoring, cross-team collaboration, and leading technical initiatives spanning multiple sprints or quarters.
• Experience establishing engineering standards, influencing technology choices, and mentoring junior and mid-level engineers.
• Active use of AI-assisted engineering tools and workflows, such as Cursor, Copilot, Devin, or Claude Code, applied critically and responsibly to design, development, testing, and debugging.
• Advanced observability implementation using Datadog, Application Insights, Amazon CloudWatch, or similar, including performance tuning and cost optimization.
• Experience with Infrastructure as Code using Terraform, Bicep, ARM Templates, AWS CloudFormation, or CDK.
• Ability to design CI/CD architectures, deployment strategies, and efficient pipelines.
• Strong proficiency with SaaS cloud architecture using Azure or AWS services, including infrastructure design and performance tuning.
• Strong containerization experience, such as Docker, or Kubernetes experience (AKS/EKS) with production-scale deployments.
• Expertise in clean architecture principles, SOLID design patterns, and domain-driven design.
• Experience driving TDD/BDD adoption, quality practices, and comprehensive automated testing.
• Experience profiling and benchmarking applications, debugging complex issues, optimizing performance, and supporting production systems.
• Confidence in vulnerability management, threat modeling, and application security.
• Commercial awareness and an outcome-oriented approach, prioritizing customer value and delivery while balancing engineering trade-offs.
• Resilience and adaptability when priorities or commercial commitments change.
• Strong analytical, problem-solving, communication, technical leadership, influencing, coaching, collaboration, and conflict-resolution skills.
• Genuine curiosity about AI and a willingness to make AI tooling a natural part of day-to-day work.
• Desirable: experience in regulated or complex domains with audit requirements, such as finance, health, or govtech.
• Desirable: experience with prompt engineering, token optimization, and Model Context Protocol (MCP) integrations.
• Desirable: advanced monitoring and APM strategies, including custom dashboards and alerting.
• Desirable: modern UI architecture patterns such as micro-frontends and SSR/SSG; security and compliance practices such as OAuth2, OIDC, and RBAC; event-driven architectures; and DevOps automation.
• Desirable: advanced Azure or AWS cloud certifications.

Responsibilities:

• Design and deliver complex, scalable systems, including multi-service integrations, high-traffic APIs, and data-processing pipelines.
• Own large features or components throughout their lifecycle, from conception through production support.
• Make commercially aware technical decisions that balance engineering trade-offs, business commitments, delivery timelines, and customer impact.
• Lead technical discussions, influence architecture decisions, and make component-level technical choices, escalating cross-team impacts to the Engineering Lead.
• Establish architectural patterns, standards, and best practices, and ensure documentation and knowledge transfer for owned systems.
• Promote AI-first ways of working, using tools such as Cursor, Copilot, and Claude Code and helping the team adopt them responsibly.
• Lead story refinement with Product Owners, providing technical expertise for estimation and risk assessment.
• Partner with product, design, and QA teams to deliver solutions that meet business objectives.
• Influence technology choices using technical expertise and business context.
• Facilitate Agile ceremonies, improve team processes, and establish practices that support predictable delivery.
• Identify technical debt and system improvements, and inspire their resolution.
• Champion TDD/BDD, automated testing, shift-left testing, and quality governance.
• Lead security implementation for complex features, establish security practices, and conduct security reviews.
• Establish team development tooling and practices, documentation standards, and knowledge-transfer approaches.
• Lead troubleshooting of complex software issues and production incidents.
• Mentor junior and mid-level engineers, establish code-review standards, review complex features, and improve team capability and delivery quality.
• Champion continuous improvement and responsible AI adoption, including team governance practices.

Technologies:

• AI
• ARM
• ASP.NET
• AWS
• Angular
• Azure
• Backend
• Blazor
• C#
• CI/CD
• Claude Code
• Cloud
• CloudWatch
• Copilot
• Cursor
• Datadog
• DevOps
• Docker
• Support
• Kubernetes
• MCP
• NoSQL
• REST
• RBAC
• React
• SQL
• Security
• TDD
• Terraform
• Vue
• Web
• UX UI Design
• Lambda
• EC2

More:

We are IRIS Software Group, one of the UKs largest privately held software companies, trusted by more than 100,000 businesses, schools, and accountancy firms. Our software supports one in six UK employees, more than 12,000 schools, and 91 of the UKs top 100 accountancy firms. We are a Great Place to Work-certified employer, recognized for our commitment to well-being, inclusion, and development, and we are growing quickly. This full-time Senior Software Engineer role is remote in the UK, within IRIS Engineering. You will work with modern .NET, C#, front-end frameworks, and cloud-native technologies as we evolve our AI-powered platform. We offer support for career growth through an experienced team, learning opportunities, and an active technical community. We value the impact this work can have on millions of people, continuous development, and a culture that celebrates diversity and empowers everyone. Our hiring process typically includes an application review, an initial call, a role-specific skills assessment, and a final interview; we explain the stages in advance and are committed to making the process accessible, including providing adjustments or accommodations.

last updated 40 week of 2026