🤝
Make a deal with Simon Josefsson
🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
253
Account age
7 yrs
💰 Suggested sponsorship rate
$40 – $65 / sponsored post
Estimated from audience size & typical reach — every deal is negotiable and held in SocialDB escrow.
🧰 Free analysis for Simon Josefsson
📊 Post engagement
9
Avg engagement / post
3.6%
Engagement vs followers
Sep 2018
On Mastodon since
🔥 Top post: Please welcome Guile Hoot in Debian #guile https://tracker.debia · 42 likes + reposts
📊 Activity & format
Posting cadence
0.62 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 11 text · 1 image · 0 video.
Follower / following
0.6×
Follows 397 back. A more reciprocal / networked account.
Recent posts
View on Mastodon ↗
Guile-GnuTLS v5.0.2 #guile https://lists.gnupg.org/pipermail/gnutls-help/2026-June/004930.html
”Exploiting ML-DSA bugs” - graphing risks with ML-DSA vs Ed25519+ML-DSA. https://cr.yp.to/papers/mldsa-20260601.pdf
Contrary opinion: go.sum is a generated non-source file and should not be stored in any git repository.
“Monitors 36 window.__oai_so_* properties tracking keystroke timing, mouse velocity, scroll patterns, idle time, and paste events. A behavioral biometric layer running underneath the fingerprint.” - how about saying that more clearly: Clou…
Please welcome age-plugin-tpm to Debian! @Foxboron https://tracker.debian.org/pkg/age-plugin-tpm
“verification theatre” - https://eprint.iacr.org/2026/192
”Cryspen’s Approach to TLS: A Critical Analysis” https://symbolic.software/blog/2026-03-07-cryspen-tls/ - I feel less confident about OpenSSH’s ML-KEM libcrux approach now
Great talk from @bunnie about the hardware supply-chain as a threat model in https://media.ccc.de/v/38c3-iris-non-destructive-inspection-of-silicon which is similar to my thinking about security dongle safety in https://blog.josefsson.org/…
”Reports of Telnet’s Death Have Been Greatly Exaggerated” https://www.terracenetworks.com/blog/2026-02-11-telnet-routing
Finally video is available too: https://video.fosdem.org/2026/ub4136/ZELSB8-guix-containers.av1.webm It seems video subtitle texts were automagically created by the FOSDEM video team, and it is wonderful to see that it s/Guix/geeks/ all o…
Slides now up: https://josefsson.org/talks/fosdem-guix-container-images.pdf
The project source code: https://gitlab.com/debdistutils/guix/container
Docker Hub: https://hub.docker.com/r/jas4711/guix
Enjoy and happy hacking ☀️
”Exploiting ML-DSA bugs” - graphing risks with ML-DSA vs Ed25519+ML-DSA. https://cr.yp.to/papers/mldsa-20260601.pdf
Contrary opinion: go.sum is a generated non-source file and should not be stored in any git repository.
“Monitors 36 window.__oai_so_* properties tracking keystroke timing, mouse velocity, scroll patterns, idle time, and paste events. A behavioral biometric layer running underneath the fingerprint.” - how about saying that more clearly: Clou…
Please welcome age-plugin-tpm to Debian! @Foxboron https://tracker.debian.org/pkg/age-plugin-tpm
“verification theatre” - https://eprint.iacr.org/2026/192
”Cryspen’s Approach to TLS: A Critical Analysis” https://symbolic.software/blog/2026-03-07-cryspen-tls/ - I feel less confident about OpenSSH’s ML-KEM libcrux approach now
Great talk from @bunnie about the hardware supply-chain as a threat model in https://media.ccc.de/v/38c3-iris-non-destructive-inspection-of-silicon which is similar to my thinking about security dongle safety in https://blog.josefsson.org/…
”Reports of Telnet’s Death Have Been Greatly Exaggerated” https://www.terracenetworks.com/blog/2026-02-11-telnet-routing
Finally video is available too: https://video.fosdem.org/2026/ub4136/ZELSB8-guix-containers.av1.webm It seems video subtitle texts were automagically created by the FOSDEM video team, and it is wonderful to see that it s/Guix/geeks/ all o…
Slides now up: https://josefsson.org/talks/fosdem-guix-container-images.pdf
The project source code: https://gitlab.com/debdistutils/guix/container
Docker Hub: https://hub.docker.com/r/jas4711/guix
Enjoy and happy hacking ☀️
🐘 Community & instance
Home server
fosstodon.org
A open-source software server — its members and audience skew toward that niche, so expect a community-aligned, engaged following.
✅ Link-verified
Verified link
Proved ownership of a website linked on their profile — Mastodon's green-check verification, a real identity signal rather than a paid badge.
On Mastodon since
Sep 2018
An OG fediverse account from Mastodon's early years — a long, established presence.
💡 Facts
🗓️Joined Mastodon in 2018 — 7 years ago.
👁️Averages 9 views per post.
📤Posts about 0.6× per week.
🛡️ Audience credibility
89/100
Excellent
Credibility score
99%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 99% real, active audience · Low fake-follower risk.
- Strong engagement (~3.6% of followers engage each post) — an active, real audience.
- Verified account.
- Established account (7+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
Luís
18%
Dr. Unabart :vepi: :jrbd:
17%
Rui Ogawa
16%
Grant Canterbury
16%
Mike Edey
14%
Sasha Kotlyar :sparkles_fiery:
10%
More like this
Find more →
Mastodon
Sasha Kotlyar :sparkles_fiery: ✓
@arktronic@infosec.exchange
253
Followers
Mastodon
Luís
@mandelbrota@masto.pt
253
Followers
Mastodon
Rui Ogawa
@rogawa@bolha.us
253
Followers
Mastodon
Mike Edey ✓
@mce@cosocial.ca
253
Followers
Mastodon
Dr. Unabart :vepi: :jrbd:
@unabart@dobbs.town
253
Followers
Mastodon
Grant Canterbury ✓
@dendroica@ecoevo.social
253
Followers
✉ Message Simon Josefsson
Reaching out to influencers is a Pro feature. Upgrade to message any influencer directly — perfect for brands and agencies booking sponsorships.
- ✓ Message any influencer from their listing
- ✓ The influencer gets notified by email
- ✓ Manage every conversation in one inbox
Already Pro? Log in.
🎤 Event / appearance with Simon Josefsson
Booking an event / appearance is a Pro feature. Upgrade to book Simon Josefsson for an in-person or virtual appearance — payment held safely in escrow until the event is done.
- ✓ Book them for events, livestreams, panels & more
- ✓ Simon Josefsson gets notified by email
- ✓ Fee held in escrow, released after the appearance
Already Pro? Log in.
🚀
You're out of free requests this month
Free accounts get 5 per month. Go Pro for unlimited sponsor pitches, collab requests & sponsorship deals — plus featured placement, the Verified badge, free withdrawals and more.
Upgrade to Pro — $9.95/mo →Your free limit resets on the 1st of next month.