We Break Into Systems
For a Living.
Grey Shield runs enterprise penetration tests for companies that can't afford to get this wrong — web, network, cloud, and mobile. Between engagements, we built Vulnfield, a practice ground where researchers learn offensive security by actually doing it.
Why we exist
Security Testing Was Never
Going to Be Enough
Grey Shield began as a straightforward penetration testing practice — web application, network, cloud, and mobile assessments, plus red team engagements for companies that couldn't risk getting this wrong.
A pattern kept showing up across client work: most researchers we met had cleared certifications and worked through lab exercises, but few had actually attacked something that behaved like a real production system. Sandboxed labs are predictable in a way live infrastructure never is. So we built the environment we wished we'd had as students — messy, realistic attack paths that respond the way real systems actually do.
That project became Vulnfield, and it's still early. We're now putting the same energy into a handful of internal tools born directly from client engagements — the kind of gaps you only notice once you've done the work yourself, week after week.
What we build
Three Pillars.
One Mission.
Enterprise Security Services
Web application, network, cloud, and mobile penetration testing, red team operations, source code review, and compliance gap analysis — scoped around what could actually go wrong in your environment, not a generic checklist.
Vulnfield — Hands-On Learning
Real attack paths in realistic environments, built and maintained by the same team that runs these attacks on client engagements — not a training vendor working from a syllabus.
Security Tools & Products
Internal tooling built to solve problems we've hit ourselves mid-engagement — currently in active development, with details to follow once it's ready to share.
Who's behind it
Senior-Led,
Start to Finish
Every engagement is scoped and overseen by senior practitioners, starting with our founder, who stays personally involved from the first scoping call through final report and retest. Nothing gets handed off partway through.
Vipin Prajapat
Founder
Vipin runs Grey Shield's client engagements personally — scoping, testing, and reporting on the same assessments he sells. He started Vulnfield after noticing how many capable researchers had never worked against a system that felt genuinely alive, and built the platform to close that gap.
LinkedInEngineering & platform
Pardeep Prajapati
Platform Engineer
Focuses on the engineering that keeps Grey Shield's systems running smoothly behind the scenes. Spends most days making sure things stay stable, fast, and dependable as the team's work scales up.
Shashank
Security Tools Engineer
Works on the tooling and infrastructure that support the team's day-to-day engagements. Prefers solving the unglamorous problems that make everyone else's work easier and more reliable.
Trust & compliance
Registered. Recognised. Accountable.
MSME Registered
Ministry of MSME, Government of India
Udyam Reg. No: UDYAM-HR-07-0029134
Work with us
Want to Test Your Defences
— or Sharpen Your Skills?
Whether you're an enterprise looking for a real security assessment, or a researcher looking to practice on realistic attack paths, we'd like to hear from you.