Job Description

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.

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About the role

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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.

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Role details

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- Level: Principal Engineer — the most senior individual-contributor role in engineering.

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- Reports to: CTO.

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- Experience: 8+ years of hands‐on software engineering, including significant time operating at a senior/staff level across complex systems.

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- Location: Remote or Hybrid — Melbourne-based (3 days/week in our St Kilda office; 2 days WFH). Remote considered with solid overlap with AEST/AEDT core hours.

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How we work

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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.

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Our stack

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Predominantly Python and React on AWS, with data processing in Databricks.

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