Architecture consulting · Australian health & government
Architecture for systems that can't fail.
Designed right the first time.
Sielewicz Consulting is a Brisbane-based architecture practice serving Australian health and government programs where failure isn't an option — national platforms, hospital systems, and the migrations, integrations, and security architectures underneath them.
Services
Fixed-scope or embeddedFour offerings, each built from patterns proven on national programs. Engagements run fixed-scope (weeks) or embedded (months), on-site or distributed.
Service 01
Architecture Assurance & Design Authority
For program directors and CIOs who need designs that survive governance.
Independent target-state review, solution assurance, and standing design-authority services — the architecture function for programs that don't have one, or a second set of eyes for those that do.
- Formal risk-rated reviews with structured endorsement positions
- Architecture review board preparation & representation
- Contested-decision resolution via criteria-based evaluation
- Standards alignment (ISM, Essential Eight, QGEA, WoG frameworks)
- Deliverable: assurance report with prioritised findings
Service 02
Migration & Cutover Assurance
For programs replacing systems that clinicians or citizens depend on daily.
End-to-end migration architecture for mission-critical replatforming — source-to-target design, data quality and reconciliation, cutover rehearsal, and rollback planning. The practice's record across every cutover designed: zero unplanned outages.
- Migration strategy & source-to-target architecture
- Data quality, reconciliation & survivorship design
- Cutover runbooks, rehearsal & rollback planning
- Deliverable: executable migration & cutover plan
Service 03
Integration, Identity & Zero Trust
For platforms exchanging sensitive data across organisational boundaries.
Interoperability and security architecture for regulated data exchange — HL7 FHIR and HL7v2 integration, national identity federation, Zero Trust authorisation, and policy-based access control.
- FHIR / HL7v2 interoperability architecture
- Zero Trust & policy-based access control design
- Identity federation across national credentials
- Deliverable: security & integration architecture pack
Service 04
AI Readiness & Platform Architecture
For organisations moving AI from pilot to governed production.
AI-readiness assessment and GenAI platform architecture for regulated environments — built on frameworks adopted as standard at a national health agency, and on serverless patterns the practice runs in production itself.
- AI-readiness & use-case assessment framework
- AI risk governance under government assessment frameworks
- GenAI architecture with clinical & safety guardrails
- Cloud platform & landing-zone design (AWS depth)
- Deliverable: AI roadmap & reference architecture
How we work
Assurance-led, governance-fluentThe same discipline on every engagement — the reason the cutover record stands at zero.
Phase 1
Discover
Current state, constraints, and the governance landscape — what must be true for this program to succeed, and who has to sign off.
Phase 2
Design
Target-state architecture with options and trade-offs made explicit — decisions framed the way executive committees and review boards need them.
Phase 3
Assure
Standards alignment, security review, rehearsal and rollback planning. Nothing goes to cutover that hasn't been tested against failure.
Phase 4
Land
Close support through delivery and transition — architecture isn't finished until the system is live, stable, and owned by your team.
Selected work
Outcomes as measured, not as marketedTransport and Main Roads (Qld)
Architecture governance & assuranceChallenge
A multi-platform, cloud-native AWS transformation of Queensland's road safety camera enforcement systems needed independent architecture governance — including a contested enterprise integration platform question that had four organisational parties at an impasse.
Approach
Established the program's end-to-end architecture review function: formal risk-rated reviews with structured endorsement positions across five system architectures. Resolved the integration impasse by designing and chairing a criteria-based evaluation — agreeing the criteria across all parties before scoring a single pattern.
Outcome
All parties signed onto an endorsed integration position paper now governing the program's patterns; platform designs progressed from not-endorsable to conditionally endorsed across review cycles.
4 organisational parties alignedMeasurable design-quality uplift per review cycleeHealth Queensland
Migration & cutover assuranceChallenge
Replace the statewide Enterprise Master Patient Index and Enterprise Service Bus — systems every Queensland hospital depends on, 24/7 — without interrupting clinical care.
Approach
Phased migration architecture with data-quality remediation, identity survivorship design, staged cutover across Hospital and Health Services, and rehearsed rollback at every gate.
Outcome
Both platforms replaced across 5 Hospital and Health Services with full clinical continuity.
Zero unplanned clinical disruptions35% integration risk reductionAustralian Digital Health Agency
Identity, Zero Trust & national platformsChallenge
Design national-scale authorisation for health data access — federated across government credentials, trusted by every jurisdiction, and able to pass the Agency's own architecture scrutiny.
Approach
Zero Trust authorisation architecture with policy-based access control, federated identity across national credentials, and a conformance framework enabling a multi-vendor ecosystem.
Outcome
National authorisation platform endorsed without rework; national data-exchange platform operating multi-tenant at scale.
First-time architecture board endorsement90+ participants · 99.9% uptimeMetro North Health
Business case to funded programChallenge
Australia's largest Hospital and Health Service needed closed-loop medication management across 5 campuses — but first, an investment case executives would fund.
Approach
Enterprise solution architecture consolidating 7 clinical applications into a coherent target state, with a phased delivery model and a business case defended directly to investment committees.
Outcome
Funded program delivered across all campuses, serving 900,000+ patients annually.
$12M+ executive funding securedZero service interruptions in deliveryWhy Sielewicz Consulting
The premium is in what you avoidPrincipal-led, always
Every engagement is delivered by the principal — not scoped by a partner and delivered by the bench. The experience you buy is the experience that shows up, from first workshop to cutover night.
Cleared and governance-fluent
Current Baseline clearance means no vetting delay. Two decades inside health and government assurance machinery means designs arrive shaped for the review boards that will judge them.
Calibrated honesty
Claims are made only where verifiable, and the practice states plainly where a technology sits outside its hands-on depth. Clients get an architect whose word survives due diligence — because it's built to.
A practice that ships
Sielewicz Consulting runs its own production platform: remediant.ai, a clinical-intelligence system for Australian aged care, designed and built in-house to the same standards recommended to clients.
It's the practice's proving ground. Every pattern in a client engagement — serverless, event-driven, FHIR ingestion, CI/CD quality gates — has been shipped and operated here first, at current AWS service depth.
Advice grounded in production, not slideware.
lambdas : 31 (Python 3.12)
iac_stacks : 25 (AWS CDK v2, TypeScript)
ingestion : FHIR R4 · HL7v2
nlp : Comprehend Medical
orchestration : Step Functions
frontend : React 19 + TypeScript
ci_cd : 12 workflows (Codecov · Bandit · Mypy · Vitest)
The principal
The practice is built on 25+ years of enterprise and solution architecture across Australia's most consequential health and government programs — the national My Health Record platform now serving 23M+ Australians, the Australian Digital Health Agency's national authorisation and provider-data platforms, Queensland Health's statewide patient-identity and integration backbone, and Healthdirect Australia's transformation architecture.
Earlier chapters span Accenture, Fujitsu, and London consulting — with delivery across education, transport, utilities, and telecommunications alongside the health and government core.
One number summarises the practice standard: across every mission-critical cutover designed in 25 years, unplanned outages total zero.
Frequently asked questions
The practical detailsWhat engagement models does the practice offer?
Fixed-scope engagements (architecture reviews, assurance reports, migration plans — typically 2–8 weeks), embedded program roles (daily rate, typically 3–12 months), and standing advisory or design-authority arrangements. All contracting is via ABN; rates depend on scope and duration and are best discussed directly.
Is the practice available now?
Yes — capacity is open for new engagements, with a start typically possible within a fortnight of agreement, subject to onboarding.
Do you work outside Brisbane?
Yes — Australia-wide. Most national programs in the practice's record ran as distributed teams. Engagements operate remote-first with travel for workshops, governance forums, and key delivery milestones.
What does Baseline-cleared delivery mean for our program?
The principal holds a current Baseline clearance under the Australian Government Security Vetting Agency framework, permitting work on OFFICIAL and PROTECTED systems from day one — removing the 3–6 month vetting delay programs face when onboarding uncleared consultants.
Who actually does the work?
The principal, on every engagement. Sielewicz Consulting is deliberately a principal-led practice: no bench, no bait-and-switch, no juniors learning on your program. Where an engagement needs specialist capacity beyond architecture — network engineering, detection engineering, product administration — the practice works alongside your teams or specialist partners and says so upfront.
How does remediant.ai relate to client work?
remediant.ai is the practice's own self-funded platform in aged-care clinical intelligence, built and operated outside engagement hours as a proving ground for the patterns recommended to clients. Where any engagement could raise a conflict, it's disclosed before contracting.
Can the practice provide references?
Yes — references from senior stakeholders across national and state health and government programs are available on request during engagement discussions.
Have a program that can't afford to fail?
Book a consultation — a 30-minute conversation about your program, its risks, and whether the practice is the right fit. It costs nothing and usually clarifies a lot.
Book a consultation