Development
Full-stack delivery, solution architecture, and the unfashionable skill of finishing.
About
I am Siebentag IT.
Jeff Cann. Principal consultant, solution architect and software engineer. Thirty years of shipping complex systems in Sydney and London — media, telecommunications, education, finance, energy, healthcare and government.
The work I am proudest of is not the stack. It is the product that still runs, the team that can operate it, and the constraint we respected instead of pretending it was not there.
Breadth
Not a specialist in one lane
QA
TDD, BDD, and test programmes introduced into teams that had been shipping on hope.
DevOps
Cloud migrations, pipelines, cost, continuity — production as a design constraint.
UX
Research, information architecture, and interfaces for people who are busy or distressed.
Business
Finances, sales, marketing, grants. Software that cannot explain its own value does not last.
Timeline
Where the years went
2024 — current
Principal Consultant & CTO · Independent / Gradus Software
Sydney
Building teacher-led education products and taking the CTO seat at Gradus Software, with a particular focus on putting large language models to work inside real learning platforms.
- Architected MusicApprentice, a next-generation music learning and content platform
- Early adoption of AI for structured content generation and interactive learning agents
2016 — 2023
Principal Consultant · Constant Consulting
Sydney
Led architecture and delivery across health, finance, mental health and economic consulting — the stretch of work that produced HealthDirect’s vaccine tools, MindSpot’s rebuild, Funding Finder and Infofox.
- HealthDirect Vaccine Clinic Finder — 60 million unique sessions in the first year
- Rebuilt MindSpot, then the world’s largest online mental health clinic
- HoustonKemp Infofox proof-of-concept that won a $1m government grant
- Architected Funding Finder for The Funding Doctor
2015 — 2016
Principal Consultant · Cevo
Sydney
Cloud migration, mobile modernisation, and retrofitting automated testing into long-lived systems.
- Led Macquarie University researchers from Intersect onto AWS
- Modernised a Macquarie Health Android app and moved its backends to AWS
- Helped PwC add automated testing to a 15-year-old global practice system
2010 — 2015
Senior Consultant · DiUS
Sydney
Led teams across telco, media, superannuation, energy and education. Built quality into programmes that did not have it, and shipped systems that still matter.
- Telstra — world’s first working GSMA Mobile Connect API implementation
- Jemena — multi-million-dollar emergency load-shedding for the NSW Eastern Gas Pipeline
- Vodafone e-Store frontend rebuild with TDD/BDD
- Bauer Media — Agile transformation and quality culture for Australia’s leading women’s network
2004 — 2009
Senior Java Developer · Independent consulting
London
Core systems for clearing, energy finance, investment banking and the courts. The years that taught how production software actually behaves under load, regulation and politics.
- London Clearing House — XML reporting engine for RepoClear and SwapClear
- Shell Central Finance — tracking ~7,000 companies and joint ventures for 3,000 global users
- Lehman Brothers — SWIFT parser and Spring/Hibernate legacy rescue
- Legal Services Commission — Crown Court solicitor payment application
2000 — 2004
Software Engineer · Early career
Sydney
Messaging engines, media optimisation and a startup — the first production scars.
- Starcom MediaVest — audience-reach optimisation against TV ratings
- Emagine — SMS and email engine for Hong Kong Telecom’s million-customer loyalty programme
Education
Bachelor of Computer Science
University of Newcastle
Clients
Organisations
Australia
UK
Legal Services Commission
Transmit
Have something real to ship?
I work with organisations that already know the problem is messy. If you need architecture, delivery leadership, or a product taken from idea to production, start a conversation.