Senior Full Stack Engineer - AI Harness

NZ: Wellington: Xero One (19-23 Taranaki St), Remote. Posted 3 days ago

The role

You will own a critical delivery stream on the MyXero platform. You will design architectural solutions, verification harnesses, and AI guardrails to enable software agents to handle implementation safely.

What you will do

Set up a local development harness with automated validation checks
Refactor legacy monolith endpoints and services built on .NET Framework, C#, and SQL Server towards modern APIs
Develop automated verification loops, test simulation harnesses, and tools
Build cloud agent tooling and collaborative workflows
Mentor team members
Shape engineering practices
Contribute to production support rotations

Required qualifications

Deep full-stack or backend engineering experience with typed languages
Practical familiarity with distributed systems architecture, API design, data modeling, and managing complex relational database migrations
Proven capability in taking ambiguous technical problems from initial conception to production delivery
Strong written communication skills
Collaborative mindset

Nice to have

Exposure to C# and .NET environments
Hands-on exploration with AI harnesses, coding agents, or automated verification pipelines

About the company

Xero is an organization where engineers work on the MyXero platform. The company hires based on skills, passion, and unique perspectives.