Staff Engineer

Harnham - Data & Analytics Recruitment; Greater London; Hybrid; GBP 61,000 - 101,000; Full time

Job summary

Harnham - Data & Analytics Recruitment in London is seeking a Staff Engineer to lead the end-to-end replacement of a premium finance integration. You will own discovery through delivery, defining the technical strategy and ensuring uninterrupted service for customers and accurate financial reporting during the transition.

The role requires hands-on C#, .NET, SQL, CI/CD, and Kubernetes experience, with exposure to Azure DevOps and Datadog.

Qualifications

• Staff Engineer/Principal Engineer with ownership of large-scale platform delivery.
• Replacing or migrating business-critical third-party integrations while maintaining live services.
• Hands-on with C#, .NET, SQL, CI/CD, DevOps and automated testing.
• Designing resilient integrations: APIs, batch interfaces, reconciliation, idempotency, observability, auditability.
• Strong knowledge of Kubernetes and cloud-native software engineering practices.
• Experience in regulated environments with financial accuracy, compliance and reporting.
• Ability to engage with technical and non-technical stakeholders and explain decisions clearly.
• Exposure to Azure/Azure DevOps/Datadog and payments or financial services is advantageous.

Responsibilities

• Map and document the existing premium finance integration landscape (APIs, batch processes, policy lifecycle dependencies, reconciliation, reporting).
• Define and own the engineering strategy for migrating to a new third-party premium finance platform.
• Design and build a robust integration solution using C#, .NET, SQL, and cloud-native practices.
• Deliver a migration approach with parallel running, phased cut-over, and clear rollback capabilities.
• Ensure financial reporting, reconciliation, customer communications, and payment collection remain accurate.
• Lead vendor integration activities, testing, cut-over execution, and knowledge transfer.

Skills

C#

.NET

SQL

CI/CD

DevOps

Automated testing

Kubernetes

Azure

Cloud-native

Stakeholder communication

Tools

Azure DevOps

Datadog

Job description

Staff Engineer, Premium Finance Integration

South West London (Hybrid) Outside IR35 £550 per dayThis is a unique opportunity to lead the end-to-end replacement of a business-critical premium finance platform within a regulated environment. You will take ownership from discovery through to delivery, defining the technical strategy and building the solution while ensuring uninterrupted service for customers and accurate financial reporting throughout the transition.

The Company

They are a well-established organisation operating within a highly regulated sector, delivering services to customers across the UK. Technology is central to their customer experience, with a strong focus on reliability, compliance and operational excellence. They are investing in the modernisation of a core financial integration and are seeking an experienced Staff Engineer to own this critical transformation programme.

The Role and Deliverables

• Map and document the existing premium finance integration landscape, including APIs, batch processes, policy lifecycle dependencies, reconciliation processes and reporting flows.
• Define and own the engineering strategy for migrating to a new third-party premium finance platform, including architecture decisions, risk management and transition planning.
• Design and build a robust integration solution using C#, .NET, SQL and modern cloud-native engineering practices.
• Deliver a migration approach supporting parallel running, phased cut-over, reconciliation between platforms and clear rollback capabilities.
• Ensure financial reporting, reconciliation, customer communications and payment collection processes remain accurate and uninterrupted throughout the transition.
• Lead vendor integration activities, testing, cut-over execution, stakeholder sign-off and knowledge transfer to the internal engineering team.

Your Skills & Experience

• Strong experience operating as a Staff Engineer, Principal Engineer or equivalent technical leader with ownership of large-scale platform delivery.
• Proven track record replacing or migrating business-critical third-party integrations while maintaining live operational services.
• Hands-on expertise with C#, .NET, SQL, CI/CD, DevOps and automated testing.
• Experience designing resilient integrations involving APIs, batch interfaces, reconciliation processes, idempotency, observability and auditability.
• Strong knowledge of Kubernetes and modern cloud-native software engineering practices.
• Experience working within regulated environments where financial accuracy, compliance and reporting are critical.
• Ability to engage effectively with technical and non-technical stakeholders and explain technical decisions clearly.
• Exposure to Azure, Azure DevOps, Datadog, event-driven architectures, payments, lending or financial services environments would be advantageous.