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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!

Show HN: VPets.net – a cozy pixel pet world

https://vpets.net/start
1•solidarnosc•6m ago•0 comments

Nemotron 3 Ultra is open weight and open data [video]

https://www.youtube.com/watch?v=D8LIIvQVGS4
1•TheJCDenton•8m ago•0 comments

The First AI QFT Textbook

https://www.math.columbia.edu/~woit/wordpress/?p=15735
1•jjgreen•11m ago•0 comments

Data centers consumed 264B gallons of water as drought hits nearly 63% of US

https://www.barchart.com/story/news/2339834/ai-data-centers-water-consumption-breaks-264-billion-...
4•yogthos•11m ago•0 comments

Compression and Intelligence [video]

https://www.youtube.com/watch?v=l6DKRf-fAAM
2•2bird3•12m ago•0 comments

Painting that made Turner's name gets second public showing since 1799

https://www.thetimes.com/culture/art/article/painting-turner-abergavenny-bridge-rcvx8hglh
1•bookofjoe•13m ago•1 comments

Investing Is Compression

https://arxiv.org/abs/2604.10758
1•lisper•14m ago•0 comments

The Zebra v4.4.1 Chronicles: Independent Audit

https://github.com/Alex74SjS3/THE-ZCASH-ZEBRA-v4.4.1-CHRONICLES
1•Alex74-SjS3•18m ago•0 comments

Spyro the Dragon returns with a new game after almost two decades

https://www.theguardian.com/games/2026/jun/07/spyro-the-dragon-returns-with-a-new-game-after-almo...
2•TechTechTech•21m ago•0 comments

Thoughts on starting new projects with LLM agents

https://eli.thegreenplace.net/2026/thoughts-on-starting-new-projects-with-llm-agents/
2•zdw•21m ago•0 comments

VibeOS: First ever AI-native operating system

https://vibeos.sh/
1•doener•23m ago•0 comments

Flock Safety Price List [pdf]

https://www.omniapartners.com/suppliers-files/E-J/Flock_Safety/Contract_Documents/R250203/5_29_20...
2•ourmandave•25m ago•0 comments

A Portrait of the Software Engineer, 2031

https://jamesjboyer.substack.com/p/a-portrait-of-the-software-engineer
1•aesthetics1•25m ago•0 comments

Ask HN: Is Facebook registration procedure broken?

2•stefanos82•26m ago•0 comments

I built a sentiment analyzer for Hacker News (as an MCP server)

https://mcpize.com/mcp/sentiment-analyzer
1•Lord_Dontavious•27m ago•0 comments

VibeOS – Hallucinated Operating System [video]

https://www.youtube.com/watch?v=z3pV6FHvcgM
2•doener•28m ago•0 comments

Academics set out vision for planetary survival

https://www.theguardian.com/environment/2026/jun/04/world-inequality-lab-equality-academics-plane...
4•worik•31m ago•0 comments

The future is controlled by companies who control the physical bottlenecks of AI

https://silicon-frontier.com/research/silicon-control
1•momentmaker•31m ago•0 comments

Why are there so many canines in fine art?

https://www.theatlantic.com/magazine/2026/07/the-dogs-gaze-thomas-w-laqueur/687312/
1•prismatic•32m ago•0 comments

Got a job, dropped this for 3 months – MaskOps, Polars PII masking in Rust

https://github.com/fcarvajalbrown/MaskOps
1•fcarvajalbrown•33m ago•0 comments

1D Image Tokenizers and Autoregressive Models for Dynamic Resolution Generations

https://arxiv.org/abs/2604.24885
1•PaulHoule•35m ago•0 comments

Expert Selections in MoE Transformer Models Reveal Almost as Much as Text

https://arxiv.org/abs/2602.04105
4•busserweiser•36m ago•0 comments

Small modular nuclear reactor reaches criticality in first test

https://arstechnica.com/science/2026/06/first-us-test-of-modular-reactor-reaches-criticality/
1•NedCode•36m ago•0 comments

NEC PC Engine LT Recap and LCD Bias Fix (Necromancy)

https://hitmanmcc.com/entry/pc-engine-lt-necromancy
1•zdw•38m ago•0 comments

The spelling error made 200B times a day (2025)

https://nbailey.ca/post/spelling-error/
2•NaOH•39m ago•0 comments

The US Only Has One Political Party [video]

https://www.youtube.com/watch?v=GUVf6DkDkgA
2•joe_mamba•40m ago•0 comments

Show HN: Claude Code on Slack/Discord/Telegram for flat $20/mo – no API bills

https://lobsteady.com
1•jvalansi•41m ago•0 comments

How much do amd64 microarchitecture levels help in Go?

https://lemire.me/blog/2026/06/06/how-much-do-amd64-microarchitecture-levels-help-in-go/
1•zdw•42m ago•0 comments

Why add an agent skill to a CLI that has a context command?

https://www.andreagrandi.it/posts/why-add-agent-skill-cli-context-command/
2•andreagrandi•47m ago•0 comments

Robotics Has a Stiffness Problem

https://hasalmon.medium.com/the-stiffness-problem-part-1-ed44c68e56b6
5•E-•47m ago•0 comments