NexusSec.Founder & CEO
NexusSec
Leads the firm and sets its technical direction across VAPT and red teaming, firewall deployment, network architecture, SD-WAN, server and storage deployment, and managed security.
NexusSec servicesSridhar Thewar
Founder & CEO, NexusSec
Sridhar Thewar founded NexusSec, a cybersecurity and IT-infrastructure firm based in Airoli, Navi Mumbai, and leads it as CEO. He sets the firm's technical direction across VAPT and red teaming, firewall deployment, network architecture, SD-WAN and managed security.
Also published as S. Sridhar Thewar.
- Role
- Founder & CEO
- Company
- NexusSec
- Based in
- Navi Mumbai, India
- Experience
- 4 years, hands-on
About
Sridhar has four years of hands-on experience across servers, firewalls, networking and cybersecurity. He founded NexusSec on a single principle: security is not a feature, it is architecture, and set up the firm to close the gap between compliance on paper and security engineering that holds up in practice.
His approach starts from the attacker's side. NexusSec scopes its engagements with reconnaissance first, architecture second, and validation by testing rather than assumption.
“Architecture is the first line of defense.”
Areas of expertise
- Network architecture
- Offensive security
- Penetration testing
- VAPT
- Next-generation firewalls
- Zero-trust architecture
- Network segmentation
- SD-WAN
- Red teaming
- Infrastructure security
Current work
In development · Not yet released
NXSgate
NexusSec, which he leads, is building NXSgate, a zone-based next-generation firewall. It has not been released; early access is open through a waitlist.
About NXSgateVerified credential
Sophos Firewall Architect
Sophos's hands-on, instructor-led training and certification in configuring and deploying Sophos Firewall.
- Issued by
- Sophos
- Issued
- Valid until
Official profiles
Articles by Sridhar Thewar
Guides he has written for the NexusSec blog, newest first.
- The questions to ask your IT supplier
- Your first 90 days without an IT team
- One laptop should not reach everything
- What a good VAPT report should contain
- What your cyber insurer actually wants to see
- Before you sign the firewall renewal
- How to answer a client security questionnaire
- Opening a branch without inheriting a mess
- When the person who knew the network leaves
- The firewall became the way in
- DPDP Act: what to actually do in 2026
- India's 2026 threat numbers, translated
- Top Firewalls to Deploy in 2026: An Enterprise NGFW Guide
- A Practical Zero-Trust Checklist for Growing Businesses
- SD-WAN vs MPLS: Which Is Right for Your Business?
- Top 10 Cybersecurity Threats in 2026 (India)
- Top 7 Network Security Mistakes Indian Businesses Make
- Why Your Business Needs VAPT
Questions about Sridhar Thewar
Who is Sridhar Thewar?
Sridhar Thewar, also published as S. Sridhar Thewar, is the founder and CEO of NexusSec, a cybersecurity and IT-infrastructure firm in Airoli, Navi Mumbai, India.
What does Sridhar Thewar do at NexusSec?
As CEO he leads the firm and sets its technical direction across VAPT and red teaming, firewall deployment, network architecture, SD-WAN, server and storage deployment, and managed security.
What credential does Sridhar Thewar hold?
Sophos Firewall Architect, issued by Sophos on 14 July 2026 and valid until 9 December 2027. It can be verified on Credly.
What experience does Sridhar Thewar have?
Four years of hands-on experience across servers, firewalls, networking and cybersecurity, which he now applies as founder and CEO of NexusSec.
Where is Sridhar Thewar based?
In Navi Mumbai, Maharashtra, India, where NexusSec is based.
How can I contact Sridhar Thewar?
Through NexusSec: use the contact page at nexussec.org/contact or email info@nexussec.org.
Get in touch
To reach Sridhar, contact NexusSec. Messages to the team reach him.
