Company lists · Data refreshed September 2026
Top 25 Secure software development companies based in Sydney, Australia
RevenueBase identified 133 secure software development companies headquartered in Sydney, Australia as of September 2026 and tracks 823 professional contacts across them, including 273 with verified work emails. Sydney is the largest hub.
This list covers secure software development companies headquartered in Sydney, Australia, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 6, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest secure software development companies based in Sydney, Australia
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 41 | ||||
“Seccom Global - The Cyber Security Company Providing excellence in service to educate, connect and protect your business Founded in 2003, Seccom Global is recognised as a leader…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | Devops1Partial evidence | 40 | |||
“At DevOps1, our technologists are dedicated to using their collective experience and knowledge of modern engineering best practices to deliver effective, secure, and…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | 30 | ||||
“At Nueva, we aim to create a safer digital environment by providing innovative and customised cybersecurity solutions for our clients.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 25 | ||||
“For most organisations in Australia, a data breach can be more than a PR disaster, it could be the final chapter.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | 23 | ||||
“SilentGrid is an offensive security consultancy with a focus on adversary simulation and penetration testing.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | 21 | ||||
“At Empire Technologies, our unwavering dedication to delivering technology solutions can help you drive business success.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | RazilioIndirect evidence | 19 | |||
“Razilio is a Sydney, Australia-based boutique cybersecurity consultancy that simplifies the management of cyber risk for businesses of all sizes.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | The Citadel GroupStrong evidence | 16 | |||
“The Citadel Group is a leading software and application development company that has been servicing the Australian Government and large corporates for over 25 years.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 16 | ||||
“Intrix Cyber Security protect businesses with our Information Security Services.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | 15 | ||||
“Skylight is a boutique cyber security practice providing high-end services to the modern enterprise.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | Mercury Information Security ServicesPartial evidence | 14 | |||
“Our mission is to provide organisations with a comprehensive, world class range of customised information security services and advice which will enable them to secure and protect…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 14 | ||||
“Morrisec provides tailored security strategies and services that align with each company’s specific threat landscape, risk profile, and strategic goals.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | 13 | ||||
“At Parabellum, we help organisations see clearly and act confidently in a complex digital world.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | 12 | ||||
“Flynk is a technology consulting firm specialised in custom software development.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | 10 | ||||
“Assertiv is a Security Services company based in Sydney, Australia with offices in Melbourne, Wellington (New Zealand), and Singapore.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | 10 | ||||
“With ZIRILIO on your side, the digital world just became safer.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | 9 | ||||
“CyberHub was established with the aim of making Cyber Security more available to companies of all sizes.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | 8 | ||||
“We want to be the next generation of cyber security consultancy firms.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | 7 | ||||
“Welcome to codeSource: Experience.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | 7 | ||||
“IQBOX helps you pinpoint your organization’s most pressing vulnerabilities, eliminate critical threats, and implement a security program that leaves you free to focus on…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | 6 | ||||
“Red Cursor was built on more than 20 years of real-world cybersecurity experience, helping protect over 800 organisations across Australia and beyond.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | 6 | ||||
“Empowering Your Business with Seamless IT Solutions Technology should empower, not complicate.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | 6 | ||||
“Cyberlinx is a premier cyber security solutions and services provider, we offer a comprehensive range of cyber security solutions, including, infrastructure and network security…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | 6 | ||||
“Vertex Cyber Security provides an extensive Cyber Security capability of Technology and Security Services for organisations across Sydney.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | 5 | ||||
“Fort1: Comprehensive Cybersecurity Services based in Australia.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 133 secure software development companies based in Sydney, Australia
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Secure software development companies based in Sydney, Australia at a glance
As of Sep 6, 2026Companies by employee count
Email recency for this list is measured across the whole Australia list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Sydney, over 133 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among secure software development companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Sydney, Australia whose own description of what they do matches “secure software development companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among secure software development companies, and records with no verified work email. Companies headquartered outside Sydney are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 273 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 6, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Secure software development companies by metro in Australia
- Secure software development companies in Sydney133
- Secure software development companies in Melbourne131
- Secure software development companies in Brisbane49
- Secure software development companies in Canberra30
- Secure software development companies in Perth28
Frequently asked
How many secure software development companies are there based in Sydney, Australia?
RevenueBase identified 133 secure software development companies headquartered in Sydney, Australia as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Seccom Global, headquartered in Sydney, tops this list with the largest team on record.
Which city has the most secure software development companies?
Sydney leads with 133 headquartered companies, followed by Melbourne (131) and Brisbane (49).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 273 verified decision-maker contacts tracked across these 133 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 6, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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