Senior Software Engineer (US)

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.

As a Senior Software Engineer, you'll be a technical leader within your team, responsible for delivering complex full-stack web applications, serving millions of users, driving technical excellence, and mentoring other engineers. You'll work hands-on with cutting-edge UI frameworks, .NET Core backends, and cloud-native technologies while contributing to architectural decisions and ensuring high-quality delivery across containerised, scalable products.

You'll join our Document Management team within the Accountancy product line, building systems for managing and securely retrieving client documents that CPA and accounting firms rely on daily - working remote or hybrid from our Salt Lake City office alongside a close-knit engineering team.

Design and deliver complex, scalable systems - document processing, storage, and workflow systems - that anticipate edge cases and long-term maintainability

Own large features or components end-to-end, from conception through production support

Lead technical discussions and influence architecture decisions within owned systems, escalating cross-team impacts to the Engineering Lead

Establish architectural patterns and standards others can follow

Lead story refinement with Product, providing technical input for estimation and risk

Champion TDD/BDD, automated testing, and security reviews - with particular rigour on document integrity and data security

Lead troubleshooting for complex issues and production incidents

Proactively identify and drive resolution of technical debt

Mentor junior and mid-level engineers, raising team capability and technical standards

Lead code review standards and conduct complex feature reviews

Champion responsible AI adoption within team practices

Internal: Engineering Teams, Engineering Lead/Manager, Accountancy Product Management, QA, DevOps, Architecture. External: Professional Services, Customer Support, third-party integration vendors.

Experience with content or document management systems, ideally within accounting or professional services

Experience with e-signature or workflow integrations, and event-driven architectures

Knowledge of security/compliance standards (OAuth2, OIDC, RBAC); experience in regulated or audit-heavy domains

Strong analysis and problem-solving for complex technical issues

Communicates technical concepts clearly to technical and non-technical stakeholders

Leads and influences without formal authority; coaches through mentoring

Collaborative, with sound judgement in technical disagreements

Learning mindset, adaptable to new tools and industry trends

Impact: Your work will influence millions globally.

Growth: Continuous learning and career development opportunities.

Belonging: A culture that celebrates diversity and empowers every individual.

Click Apply - we’re excited to learn about your unique perspective and experience. If you need adjustments during the process, let us know. We’re committed to making this opportunity accessible to everyone.

Our process is designed to be fair, transparent and straightforward. Stages vary depending on the role — more senior positions may involve additional steps, and some areas include role-specific assessments such as a technical test or case study — but typically you can expect:

Application review — we assess your experience and potential

Initial call — a short conversation to learn about you and share more about the role

Skills assessment — tailored to the position, e.g. case study, coding challenge or portfolio review

Final interview — meet the team and explore how you'll make an IMPACT at IRIS

We'll always walk you through the specific stages at the start of the process so you can prepare with confidence.

If you need any adjustments or accommodations during the process, let us know, we’re committed to making this experience accessible for everyone.