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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!

How to use Jev for financial decisions

https://revexos.medium.com/typesafes-jev-model-using-structured-ai-evaluation-in-the-financial-ac...
1•revexos•1m ago•1 comments

Show HN: RuleReceipt – check if your coding agent followed your Claude.md

https://github.com/rulereceipt/rulereceipt
1•RuleReceipt•7m ago•0 comments

An MCP server that gates/verifies/screens before agents act

https://github.com/PyModel/jev-judge-mcp
9•adobe•7m ago•0 comments

TradeKwote – AI quoting and invoicing for UK tradespeople

https://tradekwote.com
1•jparlanti•8m ago•0 comments

192GB Framework Desktop open for pre-order

https://frame.work/hu/en/blog/192gb-framework-desktop-open-for-pre-order
2•pella•10m ago•0 comments

Andy Burnham: UK Could 'Go All the Way' by Rejoining EU

https://www.theguardian.com/politics/2026/sep/30/andy-burnham-uk-could-go-all-the-way-rejoining-eu
1•karakoram•11m ago•0 comments

Value: A Verifiable Alignment Layer for Agentic AI

https://asteris.ai/blog/wiai/value-gives-agents-a-second-opinion-before-they-act
1•ai-mktg-ninja•11m ago•1 comments

Show HN: WattzGOAT – an intentionally vulnerable web app for security training

https://github.com/wattzgoat/wattzgoat-web
1•wattzgoat•14m ago•0 comments

Netherlands joins Germany in EU budget overhaul demands

https://nltimes.nl/2026/09/29/netherlands-joins-germany-eu-budget-overhaul-demands
1•ericmay•15m ago•0 comments

OpenTV Mobile, an open-source IPTV player for Android phones

https://github.com/opentv-mobile/opentv-mobile
1•topazo•15m ago•0 comments

OpenClaw Enterprise – The Open Agent Platform

https://openclaw.ai/blog/openclaw-enterprise
1•mooreds•16m ago•0 comments

I don't write codebase documentation anymore

https://rogs.me/2026/09/i-dont-write-codebase-documentation-anymore/
1•meetpateltech•17m ago•1 comments

Show HN: I built an MCP with my friend to share our knowledge with X Ads

https://www.diingdiing.com/
3•cryptography•18m ago•0 comments

US home electricity prices by state since 2019

https://www.kadoa.com/energy-prices/electricity/map
1•hubraumhugo•18m ago•0 comments

Pg_ClickHouse and chdb updates: encoding, nesting, and types

https://clickhouse.com/blog/pg_clickhouse-chdb
1•__s•19m ago•0 comments

Restate Raises $20M Series A

https://restate.dev/blog/announcing-series-a
1•gk1•19m ago•0 comments

Forge: the open source pipeline for generating SDKs, CLIs, docs

https://blog.cloudflare.com/forge-open-source-generation-pipeline/
1•theainewsreport•20m ago•0 comments

Nvidia Kumo Tabular: Open Foundation Model for Tabular Prediction

https://huggingface.co/blog/nvidia/kumo-tabular
1•acossta•21m ago•0 comments

LLM gave you an answer. Should your application trust it?

https://github.com/Vedantgitbot/booth
1•Vbrahmbhatt13•21m ago•0 comments

Are you a smartwatch "power user"?

https://shkspr.mobi/blog/2026/09/are-you-a-smartwatch-power-user/
1•edent•22m ago•0 comments

The computer hacker who tried to take down Man City

https://www.bbc.co.uk/sport/football/articles/cwywld5v28jo
1•mooreds•23m ago•0 comments

The Militia and the Mole

https://www.propublica.org/article/ap3-oath-keepers-militia-mole
2•robtherobber•23m ago•0 comments

Mububu – A 3D dress-up toy for Meta's Muse avatar, with WebGL fur

https://mububu.app/
2•bryanyyw•23m ago•0 comments

Time for an Accountability Regime for the AI Industry

https://read.misalignedmag.com/time-for-an-accountability-regime-for-the-ai-industry-8ab05f47ae87
1•lcubw•23m ago•1 comments

Twenty five years of writing on adactio.com

https://adactio.com/journal/22781
2•speckx•23m ago•0 comments

Mind-1: Cutting robot inference latency from 82ms to 32ms

https://www.mindon.tech/blog/mind-1/index.html
1•ilreb•24m ago•0 comments

Show HN: Ctrl+F Finds Words. I Wanted It to Find Answers

https://blog.tymscar.com/posts/hunchsemanticfind/
1•tymscar•24m ago•0 comments

How to back up the contents of a Video CD correctly?

https://retrocomputing.stackexchange.com/questions/32870/how-to-back-up-the-contents-of-a-video-c...
2•mooreds•24m ago•0 comments

Show HN: OpenXW, a modern enhanced port of Star Wars: X-Wing

https://github.com/elyosh/OpenXW
1•elyosh•25m ago•0 comments

When we talk about traffic violence

https://maxmautner.com/2026/09/28/when-we-talk-about-traffic-violence.html
1•oftenwrong•25m ago•0 comments