Lachlan Cotter Fractional Rails Engineer • SaaS Founder

Engineering foundations for small teams doing meaningful work

I'm Lach — I bootstrapped a SaaS business to 3,000+ customers. Now I help small teams create reliable, evolving platforms for meaningful work.

About me

I spent 14 years bootstrapping a SaaS platform to 3,000+ customers, processing $48M through Stripe, and keeping a production Rails system running smoothly through years of change.

Before that, I worked for a decade with startups and agencies across Australia and New Zealand, helping small teams ship ambitious products under real constraints.

Today, I partner with thoughtful teams building the next stage of their product — bringing calm technical leadership, strong engineering craft, and sustainable execution.

How I can help

I partner with growing product teams to provide senior full-stack engineering support — primarily in Ruby on Rails, relational systems, integrations, and modern front-end work.


Writing

I write occasional notes for technical founders about product, engineering, and learning from users.

Debugging your business model

A short piece on applying the discipline of software debugging to the assumptions inside an early business.

Read the blog


Let's grab 15 minutes

I'd love to hear what you're working on and share a concrete plan for where I could add value over the next 4–6 weeks.

No lengthy process — just a quick conversation to see if fractional support could help you move faster as you continue to grow.

— Lach

Book a call Grab my resume