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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: Ratchet – let an AI agent reflash your BIOS over a CH341A (MCP server)

https://github.com/jackulau/ratchet
1•JackLau•3m ago•0 comments

GPU Puzzles (2021)

https://github.com/srush/gpu-puzzles
1•sonabinu•4m ago•0 comments

Knowledge workers don't need frontier models

https://mukulsingh105.github.io/articles/slm-routing-knowledge-workers.html
1•azhenley•7m ago•0 comments

Making Sense of Data from Wearable Health Trackers

https://undark.org/2026/06/16/opinion-wearable-health-tracker-data/
2•EA-3167•8m ago•0 comments

Ask HN: Why is there suddenly a downvote button?

2•SpyCoder77•9m ago•2 comments

Show HN: Evaluating Local LLMs as language translators for my app

https://lector.dev/eval/
4•3stacks•10m ago•1 comments

The scandal of two-tier degrees Extra time infantilizes students

https://unherd.com/2026/05/the-scandal-of-two-tier-degrees/
2•grimcompanion•10m ago•0 comments

The AI startup with no AI: Aussie boss jailed for misleading investors

https://www.smh.com.au/technology/australian-start-up-boss-who-faked-revenue-gets-nine-years-jail...
4•contingencies•13m ago•1 comments

Show HN: StaleTrace – A temporal ledger that catches stale-state agent bugs

https://stale-trace.vercel.app/
2•zahraarman•13m ago•0 comments

Need guidance on Go-To-Market strategy

2•brainstorm23•22m ago•1 comments

Claude FM music for thinking and building [video]

https://www.youtube.com/watch?v=tRsQsTMvPNg
4•gjvc•23m ago•0 comments

Ask HN: Will programmers write more efficient code during the memory shortage?

17•amichail•26m ago•20 comments

Ask every top AI at once. Compare. Pick the best

https://gangstaai.org/
2•MarkoRocko•26m ago•2 comments

Show HN: I built an extendable full document markup language

https://longform.occultist.dev
2•angrybards•26m ago•0 comments

Waved Studio – browser-native wavetable editor

https://wavedstudio.online/landing/
3•sp8m8•28m ago•1 comments

My 1992 view of the problems of computer programming in 1992

https://blog.plover.com/prog/fortran-i.html
3•Brajeshwar•28m ago•0 comments

Americans express unease over SpaceX's influence on retirement savings

https://www.theguardian.com/science/2026/jun/19/spacex-retirement-savings-elon-musk
26•ValentineC•31m ago•3 comments

Comparison of simulation environments for robot training data

https://www.humanoidsdata.com/articles/simulation-environments-robot-training-data
2•torayeff•32m ago•0 comments

François Englert (1932 – 2026)

https://home.cern/francois-englert-1932-2026/
2•nhatcher•34m ago•0 comments

How do flocking birds and schools of fish move?

https://www.nyu.edu/about/news-publications/news/2026/june/how-do-flocking-birds-and-schools-of-f...
3•hhs•39m ago•0 comments

The Secret Revolution in Battery Technology: 3-D Printing

https://www.wsj.com/tech/battery-technology-3d-printing-c319ca9a
2•Brajeshwar•42m ago•0 comments

Nub: an all-in-one toolkit for Node.js

https://nubjs.com/blog/introducing-nub
2•eikowagenknecht•43m ago•0 comments

Fish oil supplements may not prevent Alzheimer's-related decline: study

https://news.keckmedicine.org/fish-oil-supplements-may-not-prevent-alzheimers-related-decline/
2•hhs•43m ago•1 comments

Government's websites are asking to be hacked

https://groundup.org.za/article/heres-how-insecure-governments-websites/
2•Jimmc414•45m ago•0 comments

PC-free YouTube streaming rig on a Pi 4, built for engraving coins

https://github.com/Coreymillia/YouTube-Pi4-StreamMachine
2•Teever•45m ago•0 comments

Show HN: Timestamp and provenance records for AI-assisted creative work

https://colossee.com
3•celestino_127•47m ago•0 comments

I need people to understand that Palantir is not an engineering marve

https://bsky.app/profile/chadloder.dev/post/3moo3wm25722q
4•doener•50m ago•1 comments

Job postings aren’t jobs

https://workshift.org/job-postings-arent-jobs/
5•hhs•51m ago•2 comments

New Air Force One is unveiled, a $400M plane gifted by Qatar

https://www.cbsnews.com/news/air-force-one-new-plane-trump-qatar/
3•naturalmovement•52m ago•0 comments

Superagers

https://pilot-protection-services.aopa.org/news/2026/june/01/superagers
3•dp-hackernews•53m ago•0 comments