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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!

AI Passport Photo

https://www.aipassportphoto.org/
1•wsm123456•2m ago•1 comments

How to Audit an AI Agent:Time-Travel Debugging and Drift Measurement

https://medium.com/@MirArshadTalpur/how-to-audit-not-observe-an-ai-agent-time-travel-debugging-an...
1•Arshad-Talpur•2m ago•0 comments

The cost and quality frontier across 29 AI coding models

https://bito.ai/benchmarks/ai-coding-model-cost/
1•kirti_soni171•2m ago•0 comments

Over 700 Tokens/SEC on Kimi K3 with TPU Megakernels from Inferact, Beating GPU

https://inferact.ai/blog/tpu-megakernels
2•xutingl•4m ago•1 comments

Europe's fastest supercomputer is finally getting its domestic silicon infusion

https://www.theregister.com/systems/2026/09/23/europes-fastest-supercomputer-is-finally-getting-i...
1•doener•5m ago•0 comments

FBI investigating hacking group's claim of breach of agent info

https://www.nbcnews.com/tech/security/fbi-investigating-hacking-groups-claim-massive-breach-agent...
1•ycombinatronics•5m ago•0 comments

Dolphin Progress Release 2609

https://dolphin-emu.org/blog/2026/09/24/dolphin-progress-report-release-2609/
1•madiling•7m ago•0 comments

Show HN: I asked 5 LLMs 10k questions and indexed every domain they cited

https://citegeo.uvansa.com
1•jhaankit373•9m ago•0 comments

Meta ditches the camera on its newest smart glasses

https://www.theverge.com/tech/999281/ray-ban-meta-audio-glasses-meta-connect-2026
4•geoffbp•12m ago•0 comments

The E-Ink Monopoly [video]

https://www.youtube.com/watch?v=3QbJ7pnc1Lc
1•trymas•14m ago•0 comments

Blink – Embeddable one-pass typed decision in 33 µs

https://github.com/sqliteai/blink
1•marcobambini•16m ago•0 comments

What Changed from GPT-3.5 to GPT-4? GPT-3.5: 0/30 Empty Nulls. GPT-4: 30/30

https://www.reddit.com/r/ArtificialInteligence/comments/1wotljm/what_changed_from_gpt35_to_gpt4_s...
2•rayanpal_•17m ago•0 comments

Steve Jobs' Full iPhone 4 Antennagate Press Conference Q&A Session

https://www.youtube.com/watch?v=BiN5ERktXz0
4•aSig•18m ago•0 comments

Can You Beat Jev?

https://antics.gg/can-you-beat-jev
1•thatslast•20m ago•0 comments

Albanese says OpenAI hacked Medicare and told Australia months later

https://www.theguardian.com/australia-news/2026/sep/24/anthony-albanese-says-openai-agent-hacked-...
1•skor•22m ago•0 comments

What's Left to Get Wrong

https://blogsh.app/posts/2026/what-s-left-to-get-wrong/
1•krab•23m ago•0 comments

Meta is making a standalone Muse AI gadget

https://www.theverge.com/tech/999750/muse-charm-meta-ai-hardware
1•arbayi•24m ago•0 comments

Mysteries of AI Generalization

https://www.astralcodexten.com/p/mysteries-of-ai-generalization
1•terryf•24m ago•0 comments

Lysios – LLM red teaming org

https://lysios.ai/
2•davedx•24m ago•0 comments

The biggest surprises from a year working at OpenAI

https://aalokpatwa.substack.com/p/one-year-at-openai
1•mji•26m ago•0 comments

Ways to Encrypt Data on Servers

https://lwn.net/Articles/1092553/
1•DavideNL•28m ago•0 comments

C-to-Rust Fallacy: Automatic Refactoring != Memory Security

https://arxiv.org/abs/2609.25682
3•sbulaev•29m ago•0 comments

The Nightmare of Voskhod 2

https://www.smithsonianmag.com/air-space-magazine/the-nightmare-of-voskhod-2-8655378/
1•thunderbong•30m ago•0 comments

Show HN: FireWand – A lightweight manager for GCP SQL databases

https://firewand.dev/
1•moshercode•30m ago•0 comments

Mocks and Explicit Contracts

https://dashbit.co/blog/mocks-and-explicit-contracts
1•Bluestein•31m ago•0 comments

No grades, no tests, no degree: Andreessen Horowitz launching builders' academy

https://sfstandard.com/2026/09/22/grades-tests-degree-andreessen-horowitz-launching-sf-academy-bu...
1•jnord•35m ago•0 comments

The "C" Word

https://blog.coredump.cx/p/the-c-word
2•surprisetalk•36m ago•0 comments

The Story Of Mel: A Real Programmer

https://melsloop.com/stories/the-story-of-mel/articles
1•signa11•38m ago•0 comments

Semantics Delivery Network: Rethinking Web Retrieval for LLM Agents

https://arxiv.org/abs/2609.22486
1•scottsiume•42m ago•1 comments

Browsers Situationship: When Browsers Agree but the Spec Doesn't

https://www.atbrakhi.dev/blog/browsers-situationship
2•cpeterso•44m ago•0 comments