Engineer, founder & technology leader

Jonah
Turnquist.

I build and integrate AI systems for problems where the details matter.

I’m a software engineer, founder and technology leader based in Sydney. I co-founded PropCode, turning complex planning regulations into clear, explainable answers.

Previously, I established Service NSW’s first AI engineering team and built software at Atlassian and Amazon.

From complex problems
to working systems.

PropCode

Co-founder & CTO

2022 — Present

Accurate, explainable AI at scale.

I co-founded PropCode and built its regulatory-analysis platform from the first commit to paying customers. I designed AI systems to process large volumes of legislation and assess which rules apply to each property, with a focus on accuracy, source citations and explainable reasoning.

Legal & regulatory AI · Accuracy · Explainability

Service NSW

Principal Software Engineer — AI

2020 — 2021

Building an AI capability from the ground up.

I established the agency’s first AI engineering team and led delivery of its first production chatbot. I shaped the technical strategy, hired the team and worked with contact-centre staff to integrate it into existing systems and support workflows.

AI strategy · Team building · Public services

Atlassian

Staff Software Engineer

2015 — 2019

Building and delivering enterprise software.

I led delivery of a customer migration platform, built internal engineering tools and helped shape product direction. Working across engineering, product, design and support at the company behind Jira gave me a strong grounding in enterprise software development and agile delivery.

Enterprise software · Agile delivery · Engineering leadership

Amazon

Software Development Engineer

2012 — 2014

Engineering for scale.

I built backend systems for Amazon Fresh and Amazon Music, working on services designed for massive scale. At Fresh, I developed cart, checkout and regional product-availability services, and coordinated expansion into new US regions across engineering and operations. At Music, I contributed to Cloud Player and the AutoRip launch, delivering digital music from customers’ past CD and vinyl purchases.

Scalable systems · Backend engineering · Delivery across teams

CTO at togetherAI and Parampara.

How I work.

I like working across the whole problem: understanding what people need, figuring out the technical approach, and integrating a solution into the way they work. I’m particularly interested in legal and regulatory AI: systems that analyse complex source material accurately, explain their conclusions and make their limits clear.

I studied Electrical Engineering & Computer Sciences at UC Berkeley, and have worked across startups, enterprise and government in the US and Australia. Sydney is home these days.

Say hello.