IT security and cybersecurity services for businesses
From an initial vulnerability assessment to compliance with the NIS2 Directive, we cover the full offensive security and regulatory cycle your business needs.
Why outsource technical cybersecurity?
Building an in-house offensive security team is prohibitively expensive for most companies. Hiring and retaining a senior penetration tester on staff is costly, and the range of expertise you need (web, network, Active Directory, cloud) rarely comes in a single person. We put a team with more than 10 years of experience at your disposal, without you having to manage headcount or ongoing training.
What we cover
- Web, API and mobile application penetration testing
- Internal network, perimeter and Active Directory penetration testing
- Source code audit (Secure Code Review)
- Phishing and social engineering simulations
- NIS2, DORA, ENS and ISO 27001 compliance
- Technical training and cybersecurity awareness
How we work
- Initial call: We learn about your business, your critical assets and your current exposure level.
- Tailored proposal: We design the exact scope of the service: no generic packages, no charges for what you don't need.
- Technical execution: The team works in a coordinated way, without disrupting your operations.
- Report and wrap-up: We deliver an executive report and a technical report. We explain every finding and the roadmap to fix it.
- Post-delivery support: We answer questions during remediation. If needed, we can run a retest.
Deliverables for every service
- Executive report for management (no technical jargon)
- Detailed technical report with evidence (PoC)
- Findings classified by severity (Critical / High / Medium / Low)
- Concrete remediation recommendations
- Closing meeting to answer questions
Companies that work with us
- SaaS and tech startups that need to prove their security to investors or enterprise clients
- E-commerce businesses with online payment security obligations
- Financial, healthcare or utilities companies subject to NIS2 or DORA
- Public entities that must comply with the Spanish National Security Framework (ENS)
- Companies with Microsoft environments looking to protect their Active Directory
Frequently asked questions
Do we have to sign a long-term contract?
No. Most of our services are fixed-scope projects with a concrete deliverable. If there's an ongoing relationship, it's formalized through a managed service agreement, always with defined terms and a flexible exit.
Do you work with companies of all sizes?
Yes. We have clients ranging from 5-person startups to IBEX 35 companies. We adapt the scope and price to each organization's circumstances.
What sets QuantumSec apart from other cybersecurity companies?
Offensive specialization and a close working relationship. We're not a generalist integrator. We're a technical team that understands the language of attackers, communicates it in business terms and supports the client throughout the process, not just when we deliver the report.
How do you guarantee confidentiality?
We sign an NDA before starting any work. All access and tests are documented and carried out strictly within the agreed scope.
How soon can you start?
Between one and three weeks from the moment scope is agreed, depending on team availability and the window we agree with you. We work as a boutique team with few concurrent projects, so we give a real start and delivery date before signing rather than an estimate that slips later.
Can we hire a single service, or is a package required?
A single service. Most projects are fixed engagements with a defined scope and price, with no minimum commitment and no lock-in. If it later makes sense to extend — adding a retest, moving from a one-off audit to continuous assessment — we raise it based on the work already done, not up front.
What do we get when the project ends?
Two reports and a meeting. A technical report with every finding, its evidence, reproduction steps and the specific fix; an executive report translating risk into business impact, suitable for the board or for a client that requires it. The closing meeting is for your team to ask questions, not for us to read the report aloud.
Specialised services
- Penetration testing for businesses: find your vulnerabilities before attackers do
- Red Team: real adversary simulation to measure your detection capability
- Cybersecurity audit: a technical assessment of your security posture
- Social engineering: the attack vector technology can't block
- Cybersecurity compliance: from obligation to strategic asset
- Cyber Threat Intelligence (CTI)
- Managed security (MSSP): continuous cybersecurity for your business
- Vulnerability Assessment
- Ethical hacking for businesses: know your vulnerabilities before attackers do
- External ethical hacking: perimeter assessment from the internet
- Internal ethical hacking: assessment from inside the network
- AI-assisted pentesting: more coverage in less time
- Managed bug bounty: we design, launch and run your program
- Vulnerability Triage as a Service
- Cybersecurity solutions tailored to your type of business
- Cybersecurity for SMBs: protect your business on a real budget
- Cybersecurity for startups: build secure from day one
- Security audits for apps built with AI: Lovable, Bolt, v0, Cursor and Copilot
- Safe AI use: govern what your team is already doing
- Cyber insurance for businesses: reach the insurer prepared and with the right partner
- Penetration testing and security audits for companies in Valencia
- Cybersecurity consulting for businesses
- Cybersecurity training delivered by the people running the attacks