MainDeck
We don't just advise on security by design. We build it.
MainDeck is an independent, EU-sovereign professionals network. We built it from the ground up with the same principles we apply to every client engagement: privacy first, security by default, zero compromises on data sovereignty.
It's proof that professional networking doesn't require sacrificing your data. And it's a live showcase of what security by design actually looks like in production.
Professional networking, done differently
No algorithms deciding what you see. No data sales. No surveillance.
EU data sovereignty
All data is stored and processed within the European Union. Hosted in Germany and the Netherlands on infrastructure we control directly, regardless of where you access the platform from.
No third-party tracking
No third-party trackers. No third-party analytics. Contextual ads are based on page content only, with no cookies involved. Behavioural ads require explicit opt-in and use first-party cookies only. Your professional activity stays yours.
Transparent by design
Your feed is chronological by default. No algorithmic manipulation to keep you scrolling. You control what you see and how you see it. Endorsements require a written explanation, not a meaningless click.
Your data, your rules
Full data export at any time. Complete deletion within 14 days. Granular control over who sees your profile. GDPR was baked in from the first line of code, not bolted on afterwards.
Under the hood
The same enterprise security architecture discipline we bring to client engagements, applied to our own platform.
Encryption
- TLS 1.3 enforced on all connections
- AES-256-GCM for PII and messages at the application level
- Argon2id password hashing
- Post-quantum readiness in rollout
Access controls
- Short-lived JWT tokens (15-minute expiry)
- Rotating refresh tokens
- Multi-factor authentication (TOTP)
- Exponential backoff on failed attempts
Secure development
- Every change tested against OWASP Top 10 and CWE Top 25
- Automated static analysis
- Dependency vulnerability auditing
- Server-side input validation and API rate limiting
Why we built it
The dominant professional networks treat user data as inventory. Algorithmic feeds are tuned for engagement, not for value. Privacy policies run to dozens of pages of carefully worded opt-outs.
We wanted to show it can be done differently. A professional platform that respects its users, protects their data by default, and still delivers real professional value.
MainDeck is that platform. And it's a working example of what happens when you apply security by design from day one, instead of retrofitting it later.
See for yourself
A professionals network that respects your privacy. Free to join.