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Senior Backend Engineer (MyXero Platform Modernisation)

Xero • New Zealand
Full Remote
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Key Highlights
Owns critical delivery stream for MyXero platform (hundreds of millions of daily requests)
Modernises legacy .NET/C#/SQL Server monoliths into decoupled domain services without disruption
Designs AI guardrails, automated verification loops, and test harnesses for high reliability
Key Responsibilities
Design and implement architectural solutions for MyXero platform challenges
Refactor legacy .NET/C#/SQL Server monoliths into modern APIs
Develop automated verification loops and test harnesses for production reliability
Mentor engineers and shape safe AI tool integration practices
Collaborate remotely with a New Zealand-based team in a written-first, async environment
Technical Skills Required
C#/.NET Framework Distributed systems architecture Automated verification pipelines
Nice to Have
Experience with AI harnesses or coding agents
Exposure to cloud agent tooling and automated development lifecycles
Strong written communication for technical documentation

Job Description

The role / impact

This senior engineering position owns a critical delivery stream on MyXero, the foundational platform that underpins every organisation and user record while managing hundreds of millions of daily requests. You will take ambiguous platform challenges from problem framing to durable architectural solutions, designing the specs, verification harnesses, and AI guardrails that enable software agents to handle implementation safely.

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