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Show HN: Reaktiv – I built Excel-like reactive programming for Python

https://bui.app/when-frontend-reactivity-meets-backend-python-the-story-of-my-first-1-000-download-library/
2•buibuibui•1y ago
Hi HN! I created Reaktiv, a Python library bringing reactive programming to the backend world that recently hit 1,000+ monthly downloads.

I'm actively promoting it because I believe signal-based reactivity (a concept that spread rapidly in frontend development) has huge untapped potential in Python. My breakthrough came when I stopped describing it as "Angular signals for Python" and started calling it "Excel-like computation graphs" - suddenly Python developers understood the value.

The library automatically tracks dependencies between computations, only recalculating values when dependencies change. This eliminates manual dependency tracking, prevents synchronization bugs, and reduces cognitive load when managing complex state.

Interestingly, I've noticed some initial interest from data scientists, though I'm still exploring what specific problems it might solve for them. I also believe the Home Assistant/IoT communities could benefit greatly from this approach.

Would love your thoughts on bringing frontend patterns to backend development!

Japanese Lottery Tickets

https://designreviewed.com/50-japanese-lottery-tickets/
1•Michelangelo11•2m ago•0 comments

Show HN: Smriti: Your Photos, Your Memories

https://chivukulavirinchi.github.io/photovault/
1•virinchi_cv•3m ago•0 comments

Games of Incomplete Information(2002) [pdf]

https://web.stanford.edu/~jdlevin/Econ%20203/Bayesian.pdf
1•nill0•4m ago•0 comments

AIs-welcome Lean library downstream of Mathlib

https://github.com/TauCetiProject/TauCeti
1•MADEinPARIS•7m ago•0 comments

Quil – a reboot-proof terminal multiplexer that resumes AI sessions

https://github.com/artyomsv/quil
1•artyomsv•11m ago•0 comments

The math of traffic jams and how to avoid them

https://theconversation.com/dont-change-lanes-the-maths-of-holiday-traffic-jams-287389
1•beardyw•12m ago•0 comments

Jensen Huang's $75M gift to Vanderbilt argues art decides what technology is for

https://fortune.com/2026/07/23/why-did-jensen-huang-donate-75-million-to-art-school-vanderbilt-un...
1•theanonymousone•14m ago•0 comments

Why Would Meta Download So Much Porn?

https://www.theatlantic.com/technology/2026/07/meta-strike-3-porn-lawsuit/688023/
2•hebelehubele•14m ago•1 comments

A New Approach to Nuclear Warhead Verification Using a Zero-Knowledge Protocol(2012) [pdf]

https://www.boazbarak.org/Papers/nuclear-zk.pdf
1•nill0•15m ago•0 comments

Why My Open-Source Project Hasn't Done Better

1•yohji1984•16m ago•0 comments

CP/M-68K and Motorola 68000 Emulator

https://kobolt.github.io/article-264.html
1•AlexeyBrin•16m ago•0 comments

Type checker may be wrong – Lean and the Curry-Howard correspondence

https://max-amb.github.io/blog/your_type_checker_may_be_wrong/
1•max-amb•18m ago•1 comments

Show HN: Cygnus – A fast, lightweight self-hostable serverless runtime and PaaS

https://cygnus.run
2•ccheshirecat•19m ago•0 comments

Personal context data isn't a moat, tacit knowledge is

https://cse.ac/en/jun/hobby-capital/
1•hyeongjun•20m ago•0 comments

Show HN: I made an algorithmic arena game with physics in 3D

https://algohol.net/
1•Vibr•20m ago•0 comments

Git rebase -I is not that scary

https://cachebag.sh/journal/interactive-rebasing/
1•birdculture•22m ago•0 comments

An industrial designer's take on a portfolio tracker

https://stockfly.app
1•khorsus•23m ago•0 comments

Trajectory: A Standard Format for Agent Experience Data

https://www.letta.com/blog/trajectory/
1•wertyk•25m ago•0 comments

Systems and Delays

https://martin.janiczek.cz/2026/07/24/systems-and-delays.html
1•haeseong•26m ago•0 comments

Show HN: Tawrida – Global Trade Export Documents Generator Tool

https://tawrida.xyz/tools
2•Mohamed_zakarya•27m ago•0 comments

What if the RAM/GPU shortage is deliberate?

https://xn--vk5b17r.online/posts/ram-gpu-consp/
1•theoneone•28m ago•1 comments

Copyfarleft

https://wiki.p2pfoundation.net/Copyfarleft
1•Tepix•29m ago•0 comments

Trump announces 2028 presidential bid

https://www.smh.com.au/world/trump-announces-2028-presidential-bid-20260725-p60iho.html
1•wahnfrieden•32m ago•1 comments

Scientist with 1k Patents Fueling a Drug Powerhouse

https://www.wsj.com/health/pharma/regeneron-george-yancopoulos-drug-discovery-17fea3fa
2•bookofjoe•35m ago•1 comments

FrontAlign – A CSS Framework with Semantic Utilities and Vanilla JavaScript

https://frontalign.dev
2•eyruz•43m ago•1 comments

You never have to do work again

https://hiotto.vercel.app/
2•anqer•44m ago•2 comments

How we pushed CDC into Postgres, and turned replication into clockwork

https://www.snowflake.com/en/blog/engineering/postgres-to-snowflake-replication-mirroring/
2•plaur782•51m ago•0 comments

The University After AI

https://www.chronicle.com/article/the-university-after-ai
3•Michelangelo11•52m ago•0 comments

Things I wish Datomic had: Map values

https://blog.danieljanus.pl/datomic-map-values/
2•nathell•54m ago•0 comments

Saga: Source Attribution of Generative AI Videos (identifies the model used)

https://arxiv.org/abs/2511.12834
2•giuliomagnifico•57m ago•0 comments