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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•10mo 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!

Osprey: Open Sourcing Our Rule Engine Discord Engineering

https://discord.com/blog/osprey-open-sourcing-our-rule-engine
1•matthew_hre•23s ago•0 comments

Kiro seems to have gone amok

https://ludditus.com/2026/03/28/kiro-seems-to-have-gone-amok/
1•ValentineC•37s ago•0 comments

It's Just Glorified Autocomplete

https://gpeake.com/blog/autocomplete
1•gepeake•1m ago•0 comments

AICore Developer Preview Supports Gemma 4 on Pixel TPUs

https://android-developers.googleblog.com/2026/04/AI-Core-Developer-Preview.html
1•spijdar•1m ago•0 comments

Cameron Reed: The Sci-Fi Novelist Who Disappeared for Decades

https://www.newyorker.com/books/under-review/the-sci-fi-novelist-who-disappeared-for-decades
1•mitchbob•4m ago•1 comments

Vim Classic

https://vim-classic.org/
1•netule•4m ago•0 comments

repz ret (2012)

https://repzret.org/p/repzret/
1•davikr•5m ago•0 comments

Dear Anthropic – We're Tired of Babysitting Claude

https://onlinesav.com/index.html
1•RobertHeifler•5m ago•0 comments

Show HN: Cue: Desktop app for subtitling and burned-in video export

https://github.com/davidspivak2/cue
1•davesp2•7m ago•1 comments

Data Services on Rackspace Spot:Persistent Storage Strategies

https://medium.com/@ITInAction/data-services-on-rackspace-spot-postgresql-redis-es-and-persistent...
1•aleroawani•13m ago•0 comments

A $20/month user costs OpenAI $65 in compute. AI video is a money furnace

https://aedelon777.substack.com/p/i-did-the-math-on-sora-ai-video-is
2•Aedelon•14m ago•0 comments

Show HN: RiceVM – A Dis virtual machine and Limbo compiler in Rust

2•habedi0•14m ago•0 comments

SpaceX Targets More Than $2 Trillion Valuation in IPO

https://www.bloomberg.com/news/articles/2026-04-02/spacex-is-said-to-target-more-than-2-trillion-...
1•frmersdog•15m ago•1 comments

Show HN: A LinkedIn Browser Gate Blocker

https://github.com/xaskasdf/linkedin-defense
1•xaskasdf•15m ago•0 comments

A Retro Artemis II Realtime Tracker

https://artemis-tracker.meandmybadself.com/
2•meandmybadself•15m ago•1 comments

Landdown – Simple shell script sandbox

https://git.sr.ht/~marcc/landdown
1•speckx•16m ago•0 comments

How to Build Realistic AI Companions

https://www.emotionmachine.com/blog/realistic-ai-companions
1•sarbak•16m ago•0 comments

Cloning Bench: Evaluating AI Agents on Visual Website Cloning

https://github.com/vibrantlabsai/cloning-bench
1•shahules•17m ago•1 comments

Ref/ect: Self-Improving RL layer on top of Observability

https://getreflect.starlight-search.com
2•Sonam_AI•17m ago•1 comments

Alignment Whack-a-Mole

https://arxiv.org/abs/2603.20957
1•ai_critic•18m ago•0 comments

Go-LLM-proxy – Lightweight LLM aggregator (vLLM, Llama-server)

https://go-llm-proxy.com
1•yatesdr•18m ago•1 comments

Perplexity Computer as a Second Brain

https://www.ai-supremacy.com/p/perplexity-computer-second-brain-tutorial
1•Lunaboo•18m ago•0 comments

Unitree Goes Public

https://www.chinatalk.media/p/unitrees-ipo
2•nanfinitum•18m ago•0 comments

Codemend – your app breaks in prod, the fix arrives in your Telegram

https://codemend.ai
1•nanamint•20m ago•1 comments

Give Claude Code a real browser

https://steel.dev/blog/give-claude-code-a-real-browser
1•nkko•21m ago•0 comments

NASA's mission to orbit the Moon is interrupted by Outlook refusing to open

https://twitter.com/tomwarren/status/2039693524266873055
2•rmason•22m ago•1 comments

Failed AI tractor company lays off all employees, abandons Bay Area headquarters

https://www.sfgate.com/tech/article/monarch-ai-tractor-failure-22183476.php
5•randycupertino•22m ago•1 comments

Map of breast tissue changes reveals role of menopause in cancer susceptibility

https://www.cam.ac.uk/research/news/most-detailed-map-to-date-of-breast-tissue-changes-reveals-ro...
1•gmays•23m ago•0 comments

Coreutils: A Comprehensive Review (2023)

https://ratfactor.com/slackware/pkgblog/coreutils
2•birdculture•23m ago•0 comments

What is next for big tech after landmark addiction verdict?

https://www.bbc.com/news/articles/c87wd0d84jqo
2•paulpauper•24m ago•0 comments