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Xephyr

Senior Engineer

Xephyr

. Design, build and deploy production software across Lessn's payments orchestration platform .

Posted 9/24/2026full-timeSydney • AustraliaSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in software engineering with a strong command of Python and experience in cloud infrastructure, infrastructure-as-code, and containerization. Capable of designing and deploying production software in a regulated fintech environment while mentoring junior engineers and contributing to AI/ML decision engines.

Highest-signal resume keywords
Python ProgrammingCloud Infrastructure (AWS, Azure, GCP)Infrastructure-as-CodeCI/CD PracticesFintech Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Software EngineeringProduction SystemsStrongly Typed Languages (C#, Java, C++)Automated TestingData Pipelines
Soft Skills
MentoringTeam CollaborationRapid Decision-Making
Tools & Technologies
XeroMYOBPayments Orchestration Platform
Certifications & Qualifications
National Police CheckCurrent Rights to Work in Australia
Industry Keywords
FintechPaymentsRegulated IndustryAI/ML Engineering

Tech Stack

Tools & technologies
AWSAzureCloudERPGoogle Cloud PlatformJavaPythonRuby on RailsC++

About the role

Key responsibilities & impact
  • Design, build and deploy production software across Lessn's payments orchestration platform
  • Integrate with card networks, banks, the acquirer and payout rails
  • Contribute to the AI/ML decision engine that optimises invoice payment using real-time open banking data
  • Build and maintain reconciliation integrations with Xero, MYOB and future ERP platforms
  • Introduce and champion CI/CD, automated testing and infrastructure-as-code practices
  • Mentor the graduate engineer, review code and support development
  • Act as a senior quality gate before production release in a regulated fintech environment
  • Participate in a shared escalation roster and serve as technical escalation point for customer-impacting incidents
  • Feed delivery insights into the product roadmap across integrations, accounting connectors, Payday Super, multi-currency payments and real-time reconciliation
  • Complete platform migration, compliance work, deployment ownership, automated testing, deployment pipeline, infrastructure rebuild, supplier verification/KYB automation and the data foundation/decision engine

Requirements

What you’ll need
  • 5+ years hands-on software engineering experience, including production systems in a commercial environment
  • Strong command of Python
  • Experience with at least one strongly typed language (C#, Java, C++ or similar)
  • Experience with cloud infrastructure (AWS, Azure or GCP), infrastructure-as-code and containerisation
  • Demonstrated ability to design and ship software independently, with minimal oversight
  • Comfortable operating in a small team with direct exposure to founders and rapid decision-making
  • Appointment subject to a national police check
  • Must have current rights to work in Australia
  • Preferred: experience in fintech, payments or another regulated industry
  • Preferred: exposure to AI/ML engineering and data pipelines
  • Preferred: startup or scaleup experience
  • Preferred: experience mentoring or leading junior engineers

Benefits

Comp & perks
  • Hybrid work arrangement: office in Circular Quay Monday, Wednesday and Thursday; work from home Tuesday and Friday
  • AML/CTF training on joining and annually
  • Mentorship and professional growth opportunity
  • Opportunity to contribute to agentic AI/ML engineering
  • Shared production-support escalation roster