CareerPlan

Senior Full Stack Engineer - AI Harness

NZ: Wellington: Xero One (19-23 Taranaki St)RemoteFull-time2026-11-10
Hybrid

Core

Designing specs, verification harnesses, and AI guardrails to enable software agents to safely handle implementation on a critical platform managing hundreds of millions of daily requests.

Role type

Senior Full Stack Engineer (AI Harness & Platform Modernization)

Builds

Automated verification loops, test simulation harnesses, cloud agent tooling, and decoupled domain services.

Domain

Enterprise SaaS / Identity and Platform

Deliverable

production ML models

Required skills

Full-stack or backend engineering, C#, .NET, SQL Server, distributed systems architecture, API design, data modeling, relational database migrations, AI harnesses, automated verification pipelines

Preferred skills

Experience with typed languages, cloud agent tooling, collaborative workflows for automated development lifecycle

Technologies

.NET Framework, C#, SQL Server, Cloud

Responsibilities

Setting up local development harnesses with automated validation checks, Refactoring legacy monolith endpoints and services, Developing automated verification loops and test simulation harnesses, Building cloud agent tooling and collaborative workflows

Seniority

Senior, hands-on IC