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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•8mo 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!

Anti-Coercion

https://trends.google.com/trends/explore?date=today%203-m&q=anti-coercion&hl=en
3•madspindel•3m ago•0 comments

Postmortem on TreeTracker Join: Simple, Optimal, Fast

https://zhu45.org/posts/2026/Jan/03/postmortem-on-treetracker-join-simple-optimal-fast/
2•remywang•5m ago•0 comments

Algorithmica

https://en.algorithmica.org/
3•Nales•9m ago•1 comments

Trump threatens tariffs on French wines to get Macron to join Board of Peace

https://www.reuters.com/world/europe/trump-threatens-tariffs-french-wines-get-macron-join-board-p...
3•kamaraju•9m ago•0 comments

AI Californication

4•shoman3003•12m ago•0 comments

Is This the Future of Software Development? (2026 Predictions)

https://theexceptioncatcher.com/2026/01/predictions-for-development-practices-in-2026/
2•monksy•13m ago•0 comments

Apple Intelligence Siri is over a year late, but that might be a good thing

https://9to5mac.com/2026/01/18/apple-intelligence-siri-delay-comes-with-one-benefit/
2•fork-bomber•18m ago•0 comments

Scientists spends 20 years studying Japanese tits

https://www.youtube.com/watch?v=doj_wt9ER_Q
3•gsf_emergency_6•19m ago•0 comments

KAOS – The Kubernetes Agent Orchestration System

https://github.com/axsaucedo/kaos
2•axsaucedo•20m ago•1 comments

Open source's new mission: Rebuild the EU tech stack

https://www.theregister.com/2026/01/19/open_sources_new_mission_rebuild/
3•rippeltippel•25m ago•0 comments

Ribs (Recordings)

https://en.wikipedia.org/wiki/Ribs_(recordings)
2•thunderbong•26m ago•0 comments

The Rebirth of Pennsylvania's Infamous Burning Town

https://www.atlasobscura.com/articles/centralia-pennsylvania-rebirth
3•pbshgthm•28m ago•0 comments

Substack of Keir Starmer

https://substack.com/@keirstarmer
2•manlymuppet•34m ago•0 comments

The Longest-Running Lab Experiment Is Almost 100 Years Old

https://www.sciencealert.com/the-worlds-longest-running-lab-experiment-is-almost-100-years-old
2•jnord•36m ago•1 comments

Some C habits I employ for the modern day

https://www.unix.dog/~yosh/blog/c-habits-for-me.html
1•signa11•37m ago•0 comments

Renfrew Christie Dies at 76; Sabotaged Racist Regime's Nuclear Program

https://www.nytimes.com/2026/01/14/world/africa/renfrew-christie-dead.html
1•bryanrasmussen•40m ago•1 comments

AI and jobs: The decline started before ChatGPT

https://engineeringprompts.substack.com/p/ai-and-jobs-the-decline-started-before
3•_delirium•43m ago•1 comments

Twenty-Fifth Amendment

https://constitution.congress.gov/constitution/amendment-25/
2•rolph•46m ago•0 comments

The Era of Spec-Driven Development Has Begun

https://twitter.com/deepwhitman/status/2013423486983905282
1•bilater•46m ago•0 comments

White-collar overproduction means the victory of sharp elbows over sharp minds

https://twitter.com/EricRWeinstein/status/1168926268202672128
2•MrBuddyCasino•50m ago•0 comments

OpenAI GPT-5.2-Codex (High) vs. Claude Opus 4.5 vs. Gemini 3 Pro (In Production)

https://www.tensorlake.ai/blog/gpt5.2-codex-high-vs-opus-4.5-vs-gemini-3-pro
1•shricodevvv•55m ago•0 comments

A Canadian's Call to Arms, Being Pissed Off at the State of Computing

https://aaron.vegh.ca/2026/01/a-modest-proposal
3•HotGarbage•1h ago•0 comments

The Ordinary Heroes of the Taj Hotel: Rohit Deshpande (2012) [video]

https://www.youtube.com/watch?v=vQGz1YRqBPw
1•kamaraju•1h ago•0 comments

Ridiculously Huge Numbers [video]

https://www.youtube.com/playlist?list=PL3A50BB9C34AB36B3
1•xelxebar•1h ago•1 comments

Using Beads to supercharge my agent workflow

https://jonsimpson.ca/using-beads-to-supercharge-my-workflow/
1•jonniesweb•1h ago•1 comments

Show HN: Ulog – USB serial logger with auto session management

https://github.com/matterizelabs/ulog
1•abu-matterize•1h ago•4 comments

Becoming a Whorelord: The Overly Analytical Guide to Escorting (2021)

https://knowingless.com/2021/10/19/becoming-a-whorelord-the-overly-analytical-guide-to-escorting/
3•andsoitis•1h ago•1 comments

The End of Industrial Society (2021)

https://www.palladiummag.com/2021/03/24/the-end-of-industrial-society/
2•MrBuddyCasino•1h ago•0 comments

Defections from $12B Thinking Machines shows struggle for AI talent

https://fortune.com/2026/01/16/mira-murati-thinking-machines-staff-defections-openai-zoph-metz-sc...
1•nsoonhui•1h ago•0 comments

What's biggest mistake companies make when trying to implement Generative AI?

1•datacouch•1h ago•0 comments