Help us build an AI-native platform where segmentation, analysis and activation happen through conversation, not configuration. Lexer is a Customer Data Platform that's been helping retail and hospitality brands understand and act on their customer data for seventeen years. We're now rebuilding what a CDP can be: an AI-native platform where the hard work of segmentation, analysis, and activation happens through conversation, not configuration. We're looking for a Principal Engineer to work with our AI product teams on the hardest technical problems we have.
About the role
This is the most senior individual-contributor engineering role at Lexer. You'll shape how the engineering organisation builds, through demonstrated technical authority and the quality of the systems you create. At its core this is a software engineering role. You're building and operating a SaaS and data platform product that our customers rely on every day — multi-tenant, always-on, and held to a high bar for quality, performance and reliability. We've transitioned to agentic harness engineering and spec-driven development, where engineers direct AI agents and maintain the systems that produce software rather than writing all of it by hand.
Role details
- Level: Principal Engineer — the most senior individual-contributor role in engineering.
- Reports to: CTO.
- Experience: 8+ years of hands‐on software engineering, including significant time operating at a senior/staff level across complex systems.
- Location: Remote or Hybrid — Melbourne-based (3 days/week in our St Kilda office; 2 days WFH). Remote considered with strong overlap with AEST/AEDT core hours.
How we work
We practice spec-driven development inside an agentic harness: engineers direct AI agents and maintain the systems that produce software. Our engineering culture draws on XP — test-first, continuous integration, small batches, pairing, and shared ownership.
Our stack
Predominantly Python and React on AWS, with data processing in Databricks.
Principal Engineer employer: King River Capital Group
Cover Genius is an exceptional employer that prioritises the well-being and growth of its team members. With a flexible work environment, opportunities for global collaboration, and a strong commitment to diversity and social initiatives, employees are empowered to thrive both personally and professionally. The company's focus on employee stock options and philanthropic programs further enhances the rewarding experience of working in a dynamic and supportive culture.
