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Make a deal with Fredrik Johansson
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Followers
166
Account age
3 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 Fredrik Johansson
Known for
15 views
New blog post: Fast nonbinary arithmetic https://fredrikj.net/blog/2026/fast-nonbinary-arithmetic/
I'm adding support in FLINT for bignums in any radix (base 10, base 11...) which are nearly as efficient as machine-radix bignums for many operations (and for some operations even faster). This enables big speedups for operations like base conversion and p-adic arithmetic. High-precision base-10 arit
8 views
Ready to refactor some old code.
📊 Post engagement
9
Avg engagement / post
5.4%
Engagement vs followers
Nov 2022
On Mastodon since
🔥 Top post: I'm pleased to announce FLINT 3.6: https://github.com/flintlib/f · 25 likes + reposts
📊 Activity & format
Posting cadence
0.28 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 10 text · 2 image · 0 video.
Follower / following
2×
Follows 81 back. A more reciprocal / networked account.
Recent posts
View on Mastodon ↗
New blog post: FLINT development in the age of AI
A writeup about my recent experience using AI (mainly Claude) for FLINT work, including developing and implementing nontrivial mathematical algorithms. TLDR: used correctly, these tools are…
FLINT 3.5 was released a couple of days ago (https://github.com/flintlib/flint/releases/tag/v3.5.0).
Highlights:
* The new radix module for fast multiprecision arithmetic in nonbinary radix (e.g. decimal or p-adic)
* Significantly faster a…
There is an open two-year position for a research engineer working on Pari/GP in Bordeaux:
https://recrutement.inria.fr/public/classic/en/offres/2025-09454
You'll be working with my excellent colleagues Aurel Page and Bill Allombert, among…
The next FLINT development workshop is scheduled for June 15 - 19 in Bordeaux:
https://flintlib.github.io/workshop2026.html
New blog post: Fast nonbinary arithmetic https://fredrikj.net/blog/2026/fast-nonbinary-arithmetic/
I'm adding support in FLINT for bignums in any radix (base 10, base 11...) which are nearly as efficient as machine-radix bignums for many o…
mpmath 1.4.0 is available: https://github.com/mpmath/mpmath/releases/tag/1.4.0
Big thanks to Sergey B Kirpichev for managing this release!
Once again missing out on the RIPEC C3 bonus :-(
I'm not really surprised since my publication record during the three-year evaluation period has been lacking (just two conference papers and one journal paper), though I had some hope that…
We've just released FLINT 3.4.0! Long writeup on my blog: https://fredrikj.net/blog/2025/flint-3-4/
For the first time in over 20 years, newly discovered works by JS Bach!
https://www.youtube.com/watch?v=vDGRpqDq-M4
Ready to refactor some old code.
Announcing the next FLINT workshop at École Polytechnique in Palaiseau (near Paris, France), October 27 – 31!
https://flintlib.github.io/workshop2025_october.html
If you want to attend, please contact Albin or Marc to register. We expect t…
New blog post: Fast nonbinary arithmetic https://fredrikj.net/blog/2026/fast-nonbinary-arithmetic/
I'm adding support in FLINT for bignums in any radix (base 10, base 11...) which are nearly as efficient as machine-radix bignums for many o…
mpmath 1.4.0 is available: https://github.com/mpmath/mpmath/releases/tag/1.4.0
Big thanks to Sergey B Kirpichev for managing this release!
Once again missing out on the RIPEC C3 bonus :-(
I'm not really surprised since my publication record during the three-year evaluation period has been lacking (just two conference papers and one journal paper), though I had some hope that…
We've just released FLINT 3.4.0! Long writeup on my blog: https://fredrikj.net/blog/2025/flint-3-4/
For the first time in over 20 years, newly discovered works by JS Bach!
https://www.youtube.com/watch?v=vDGRpqDq-M4
Ready to refactor some old code.
Announcing the next FLINT workshop at École Polytechnique in Palaiseau (near Paris, France), October 27 – 31!
https://flintlib.github.io/workshop2025_october.html
If you want to attend, please contact Albin or Marc to register. We expect t…
🐘 Community & instance
Home server
mathstodon.xyz
Their home server on the fediverse — the instance a creator picks signals the community they belong to.
On Mastodon since
Nov 2022
Joined in the Twitter-exodus wave of late 2022 — part of the migration that made Mastodon a real destination.
💡 Facts
🗓️Joined Mastodon in 2022 — 3 years ago.
👁️Averages 9 views per post.
📤Posts about 0.3× per week.
🕵️ Fake follower check
Estimated80/100
Excellent
Credibility score
97%
Real
Real audience
Low
Fake-follower risk
High
Data confidence
- Est. 97% real, active audience · Low fake-follower risk.
- Strong engagement (~5.4% of followers engage each post) — an active, real audience.
- Established account (3+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
Researcher at Inria working on computer algebra & arbitrary-precision arithmetic. Developing FLINT, Arb, mpmath, and various other open source software libraries. Now also a proud dad! https://fredrikj.net
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
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