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Xero

Senior Full Stack Engineer – AI Harness

Xero

. Own a critical delivery stream on MyXero, the foundational platform underpinning organisation and user records .

Posted 11/10/2026full-timeWellington • New ZealandSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in full-stack or backend engineering with a focus on C#, .NET, and distributed systems architecture. Capable of designing and implementing automated verification pipelines and mentoring team members in safe engineering practices.

Highest-signal resume keywords
C# Programming.NET FrameworkDistributed Systems ArchitectureAutomated Verification PipelinesAPI Design

ATS Keywords

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Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills
Full-Stack EngineeringBackend EngineeringData ModelingComplex Relational Database MigrationsLegacy RefactoringAutomated TestingCloud Agent ToolingVerification Harness DesignAI Guardrails ImplementationProduction Delivery
Soft Skills
Strong Written CommunicationCollaborative MindsetMentoring
Tools & Technologies
SQL ServerAutomated Validation ChecksDevelopment HarnessTest Simulation HarnessesCollaborative Workflows
Industry Keywords
New ZealandWorking Rights

Tech Stack

Tools & technologies
CloudDistributed SystemsSQL.NET

About the role

Key responsibilities & impact
  • Own a critical delivery stream on MyXero, the foundational platform underpinning organisation and user records
  • Take ambiguous platform challenges from problem framing through durable architectural solutions
  • Design specifications, verification harnesses, and AI guardrails for safe software-agent implementation
  • Support modernisation of a large system into decoupled domain services without disrupting dependent products
  • Set up a local development harness with automated validation checks for production changes
  • Refactor legacy .NET Framework, C#, and SQL Server monolith endpoints and services toward modern APIs
  • Develop automated verification loops, test simulation harnesses, and tools reducing operational toil and manual checks
  • Build cloud agent tooling and collaborative workflows supporting an automated development lifecycle
  • Ensure high reliability through automated verification and robust testing harnesses
  • Mentor team members and shape safe engineering practices with intelligent tools
  • Collaborate with engineers and product partners primarily across New Zealand
  • Participate constructively in production support rotations

Requirements

What you’ll need
  • Deep full-stack or backend engineering experience with typed languages, ideally C# and .NET environments
  • Hands-on exploration with AI harnesses, coding agents, or automated verification pipelines
  • Practical familiarity with distributed systems architecture, API design, data modeling, and complex relational database migrations
  • Proven capability taking ambiguous technical problems from conception to production delivery
  • Strong written communication skills for design records and technical documentation
  • Collaborative mindset and willingness to contribute to production support rotations
  • Candidates must be based in New Zealand
  • Candidates must have appropriate working rights for the country the role is based in

Benefits

Comp & perks
  • Flexible remote-first setup with office access in Wellington or Auckland
  • Written-first, remote-first working philosophy
  • Async communication and balanced collaboration
  • Supportive, open environment with shared learning
  • Blameless reviews
  • Fair and supportive recruitment experience
  • Recruitment accommodations or adjustments, including modified interview format, additional assessment time, and assistive technology
  • Background checks may include credit and criminal history checks