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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•11mo 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!

Hire a Freelancer Quantitative Developer

https://mathematicsconsultants.com/2026/04/19/hire-a-freelance-phd-quantitative-developer-or-rese...
1•GeniusConsult•2m ago•0 comments

The Social Battery and Symbolic Systems: Religion as Mediated Reciprocity

https://www.academia.edu/165768082/The_Social_Battery_and_Symbolic_Systems_Religion_as_Mediated_R...
1•W_G_III•5m ago•0 comments

Decision Density

https://jamesshelley.com/decision-density.html
1•zdw•5m ago•0 comments

Show HN: Slop Cop Claude Code / Cursor Plugin

https://github.com/yasyf/slop-cop
2•yasyfm•8m ago•0 comments

HTML5 Coupler Loop – Working

https://neocities.org/
1•rogmash•8m ago•0 comments

Sandboxes and Worktrees: My Secure Agentic AI Setup in 2026

https://mikemcquaid.com/sandboxed-agent-worktrees-my-coding-and-ai-setup-in-2026/
3•jdorfman•9m ago•0 comments

Five Days That Remade the Supreme Court

https://www.nytimes.com/2026/04/18/us/politics/supreme-court-shadow-docket.html
2•mitchbob•13m ago•1 comments

Changes in the system prompt between Claude Opus 4.6 and 4.7

https://simonwillison.net/2026/Apr/18/opus-system-prompt/
3•simonw•15m ago•0 comments

Show HN: Open Passkey – open-source passkey auth with free "backendless" host

https://github.com/locke-inc/open-passkey
2•connorpeters•16m ago•0 comments

OpenAI's April 2026 Policy Release: Industrial Policy for the Intelligence Age

https://www.landgate.com/news/energy-intelligence-for-open-ai-s-industrial-policy-blueprint
1•ninjahawk1•28m ago•0 comments

Testing Out the Armips Assembler on the Xorshift PRNGs

https://bumbershootsoft.wordpress.com/2026/04/18/testing-out-the-armips-assembler-on-the-xorshift...
1•ibobev•29m ago•0 comments

Instrumental Insemination of Honey Bee Queens

https://news.cahnrs.wsu.edu/videos/instrumental-insemination-of-honey-bee-queens-techniques-and-b...
2•rolph•34m ago•0 comments

The Unabomber Manifesto in 2026 – Scary Accurate

https://medium.com/@vagobond/reading-the-unabomber-manifesto-in-2026-90c4417fc309
3•ZguideZ•35m ago•2 comments

SEO, AEO, and Geo for a Modern Developer Portfolio

https://www.yashkapure.com/en/blog/seo-aeo-geo-for-a-modern-developer-portfolio/
1•yashkapure•38m ago•0 comments

Show HN: Figma-style visual editor for multi-agent choreography

https://github.com/dance-of-tal/dot-studio
2•monarchjuno•39m ago•0 comments

NASA Shuts Off Instrument on Voyager 1 to Keep Spacecraft Operating

https://science.nasa.gov/blogs/voyager/2026/04/17/nasa-shuts-off-instrument-on-voyager-1-to-keep-...
29•sohkamyung•41m ago•2 comments

AI-Assisted Coding: Why a Distinguished Engineer Stopped Reading Code

https://vascoduarte.substack.com/p/ai-assisted-coding-why-a-distinguished
3•e2e4•46m ago•2 comments

BenchJack – an open-source hackability scanner for AI agent benchmarks

https://github.com/benchjack/benchjack
2•mogician•46m ago•0 comments

The Wired Belts Are the New Rust Belts

https://fletcher.tufts.edu/news-media-mentions/all-news/wired-belts-are-new-rust-belts
1•mitchbob•47m ago•0 comments

Show HN: Jitter Done – a simple tool to understand your caffeine metabolism

https://jitterdone.com/
1•jere•50m ago•1 comments

What if I do not want to provide my cell phone number?

https://www.vendpark.io/faq/what-if-i-do-not-want-to-provide-my-cell-phone-number-new
1•kmstout•54m ago•0 comments

Post-Quantum Cryptography Migration at Meta: Framework, Lessons, and Takeaways

https://engineering.fb.com/2026/04/16/security/post-quantum-cryptography-migration-at-meta-framew...
3•birdculture•58m ago•0 comments

Claude Design System Prompt

https://gist.github.com/mcrowe/9da081f52e0740886d39e730852dba49
3•mcrowe•1h ago•1 comments

Construction delays hit 40% of US data centers planned for 2026

https://arstechnica.com/ai/2026/04/construction-delays-hit-40-of-us-data-centers-planned-for-2026/
2•cratermoon•1h ago•0 comments

A more efficient implementation of Shor's algorithm

https://lwn.net/Articles/1066156/
1•dralley•1h ago•0 comments

ICE Smashed Her Car Windows on the Way to the Doctor. She's Fighting Back[TORT$]

https://www.motherjones.com/politics/2026/04/ice-aliyah-rahman-tort-ntca-dhs/
3•rolph•1h ago•1 comments

Operational Readiness Criteria for Tool-Using LLM Agents

https://zenodo.org/records/19211676
2•rogelsjcorral•1h ago•0 comments

IMDB recent update: user reviews can't be accessed anymore without an account

https://old.reddit.com/r/movies/comments/1soome4/imdbs_very_recent_update_made_it_so_user_reviews/
3•amelius•1h ago•1 comments

New Theorems

https://monogate.org
1•zonked45•1h ago•0 comments

What Used to Be Viivikonna (2021)

https://emptiness.eu/field-reports/what-used-to-be-viivikonna/
1•carlos-menezes•1h ago•0 comments