Jelmer✓ Add us as a preferred source on Google
🔄 Data last refreshed 16 days ago
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Make a deal with Jelmer
🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
309
Account age
1 yrs
💰 Suggested sponsorship rate
$40 – $65 / sponsored post
Estimated from audience size & typical reach — every deal is negotiable and held in SocialDB escrow.
🎁 Free analysisfor Jelmer
📊 Post engagement
Recent posts · likes + reposts
Oct 3latest
4
Avg engagement / post
1–4
Typical post (engagement)
1.3%
Engagement vs followers
64/100
Consistent reach
Aug 2025
On Mastodon since
Half of recent posts land between 1 and 4 likes + reposts (median 3) — a dependable floor a sponsored post can count on.
🔥 Top post: I've been working on a source code viewer for #Debian packages - · 11 likes + reposts
📊 Activity & format
Posting cadence
0.28 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 12 text · 0 image · 0 video.
Follower / following
0.5×
Follows 577 back. A more reciprocal / networked account.
Recent posts
View on Mastodon ↗
I've been sending data access requests under GDPR (article 15) to various companies I've interacted with. Several - most notably #rouvy - have not read the message at all and promptly just deleted my account.
I've been working on a #sourcegraph like code browsing tool for Debian that's aware of all of the core languages and allows you to jump between definitions and find all references to a symbol - all based on the SCIP format. It builds on th…
I liked using --- in LaTeX before LLMs made it uncool.
https://blog.metabrainz.org/2026/02/24/robert-kaye/
Really sad to hear about Robert's passing. :-( I have fond memories of meeting him at some of the early Summer of Code Mentor Summits and other FOSS events.
There is something ironic about the mic sound clipping in the Linux Audio room at #FOSDEM
I've arrived in Brussel for my 22nd (I think?) in-person #FOSDEM. Looking forward to seeing people in person - I'll be reachable on Signal, matrix or IRC if you'd like to say hi.
There is some dubious reporting out there that affects somebody close to me, including in a (lazily written) dpa article that has been published by a number of German newspapers. I've written to a number of editors to complain and the resp…
The @openssf #scorecard project is misleading and harmful; it reduces projects to fairly arbitrary numerical scores based purely on whether they're using tools the scorecard authors are familiar with. For example, it doesn't recognize ruf…
@heptapod Hello, I've tried to email two email addresses (support@clever-cloud.com and contact@heptapod.net) to get my account unblocked but both bounce (and one reveals the addresses it's aliased to). Is there a better place to ask?
Disappointed to see #strava using software patents offensively. Another good reason to consider alternatives.
Now that I'm taking the #eurostar at twice per month, the absolute worst part of it is the departure lounge at St Pancras.
🐘 Community & instance
Home server
hachyderm.io
A tech & engineering 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
Aug 2025
An established account with real history on the platform.
💡 Facts
🗓️Joined Mastodon in 2025 — 1 year ago.
👁️Averages 4 views per post.
📤Posts about 0.3× per week.
📍Based in United Kingdom.
🕵️ Fake follower check
Estimated47/100
Fair
Credibility score
71%
Mixed
Real audience
Medium
Fake-follower risk
High
Data confidence
- Est. 71% real, active audience · Medium fake-follower risk.
- Low engagement (~1.3% of followers engage each post) — a sign of an inflated or inactive audience.
- Verified account.
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
London-based Dutch Free Software nomad. #foss hacker working on #debian #samba #wireshark #breezy #bitlbee #dulwich
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
Steffi Jên 🏴🏳️⚧
32%
Maddie :linuxmint: :xfce:
18%
Alex 🔧🔮🌎🪿:honk:
13%
B.
13%
Ilya Sergey
11%
hynekolog
11%
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Frequently asked questions
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How many followers does Jelmer have?
Jelmer has 309 followers on Mastodon.
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