Australian owned · Application security specialists
Secure software,
from the source.
Zerosource is an Australian application security company. We are experienced hackers and software developers — so we do not stop at “the login page looks fine”. We read your code, understand your architecture, and help your engineers ship software that holds up under real attack.
- Avg. team experience
- 12+ yrs
- Vulnerabilities Found
- 3300+
- Australian-based team
- 100%
Trusted across
- Government
- Law Enforcement
- Mining & Resources
- Financial Services
- Healthcare
- Critical Infrastructure
About us
We were engineers before we were attackers.
Zerosource was founded on a simple frustration: most security reports tell developers what broke, but never why the code allowed it — or how to design it out for good.
We are a small, senior, Australian-based team of penetration testers, secure code reviewers and security engineers. Every one of us has shipped production software, and every one of us has broken it. That dual perspective is the whole point: we can sit in a sprint planning session in the morning and pop a deserialisation chain in the afternoon.
Our team has spent well over a decade securing software for government and law enforcement, mining and resources, financial services and healthcare — environments where the threat model is real, the compliance bar is high, and the systems are rarely greenfield. We work equally comfortably on a modern Kubernetes platform, a twenty-year-old claims engine, or a battery management controller.
- Source-first assurance, not surface-level scanning
- Senior consultants only — no junior bench, no hand-offs
- Australian sovereign delivery, security-cleared personnel available
- Findings written for developers, mapped for executives
Why choose us
Depth you can act on
Anyone can hand you a scanner export. We are engaged when the stakes, the codebase, or the architecture demand something considerably better.
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Hackers who ship code
Our consultants write software for a living too. You get exploitation depth and a remediation conversation your developers actually want to have — in their language, in their repo, at their layer of abstraction.
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Whitebox by default
Blackbox testing finds what an attacker finds in a week. Source-code-assisted testing finds what they would find in a year — race conditions, broken authorisation logic, unsafe deserialisation, and the flaws no payload list will ever reach.
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Sector-hardened context
Government, law enforcement, mining, finance and healthcare each carry their own threat actors, obligations and legacy realities. We arrive already fluent in yours, so scoping is fast and the findings are relevant.
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Australian & sovereign
Locally owned, locally staffed, locally hosted. Your source code never leaves Australian jurisdiction, and clearance-holding personnel are available for engagements that require them.
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No shelfware reports
Every engagement closes with a developer walkthrough, prioritised remediation guidance, reproducible proof-of-concepts and a free retest. We measure success by what gets fixed, not by page count.
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Built into your pipeline
We do not just test at the end. We help you shift assurance left — gates in CI, hardened runners, meaningful SAST/DAST signal, and a supply chain that resists compromise rather than merely documenting it.
Services
Assurance across the whole software lifecycle
From a single point-in-time test to an embedded security engineering partnership — scoped to your architecture, not to a template.
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Whitebox Penetration Testing
Source-code-assisted technical assurance — our flagship service. Full read access to your repositories and architecture, combined with hands-on exploitation, to find the vulnerabilities that blackbox testing structurally cannot.
- Web & API
- Mobile
- Thick client
- Cloud-native
- Retest included
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Secure Code & Architecture Review
Manual, threat-model-driven review of your source and system design. We follow the trust boundaries, the authorisation model and the data flows — then tell you which design decisions are quietly costing you security.
- Threat modelling
- Design review
- Crypto review
- Authz logic
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Security Engineering
Security engineers embedded alongside your developers, building the controls rather than just recommending them — authentication, authorisation, secrets management, hardened defaults and reusable secure patterns.
- Control build
- Paved roads
- Secure defaults
- Uplift
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DevSecOps & CI/CD Pipeline Security
Two problems, both ours: security of the pipeline — runners, tokens, artefact signing, dependency and supply-chain integrity — and security in the pipeline, with automated gates that produce signal instead of noise.
- Supply chain
- Runner hardening
- Secrets
- SAST/DAST/SCA
- SBOM
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Cloud, Embedded & IoT Security
Assurance beyond the browser: cloud platform and IAM review, container and Kubernetes hardening, firmware analysis, hardware interfaces, and the provisioning and update paths of connected device fleets.
- AWS / Azure / GCP
- Kubernetes
- Firmware
- Protocol & RF
- OT-adjacent
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AI & LLM Application Security
AI features inherit every classic application flaw and add new ones. We threat model and test agents, tool-calling, RAG pipelines and model supply chains — prompt injection, data exfiltration, excessive agency and unsafe autonomy.
- Prompt injection
- Agent & tool abuse
- RAG boundaries
- Model supply chain
Application Security Advisory
Not sure what you need yet? We help organisations design the whole programme: secure-by-design governance, AppSec maturity uplift, standards and coding guidelines, vendor and third-party assurance, security champions, and board-level reporting that reflects real risk rather than open-ticket counts.
Contact
Let’s scope your next engagement
Tell us what you are building and what worries you. You will speak to a consultant who will actually be on the job — not a salesperson.