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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!

Ray-Ban Meta and Oakley Meta AI Glasses Officially Available in Singapore

https://cnalifestyle.channelnewsasia.com/style-beauty/ray-ban-meta-and-oakley-meta-ai-glasses-sin...
1•kelt•9s ago•0 comments

Learning Material for Idiomatic Rust

https://corrode.dev/blog/idiomatic-rust-resources/
1•lwhsiao•28s ago•0 comments

Show HN: gcx – The Official Grafana Cloud CLI

https://github.com/grafana/gcx
1•annanay•1m ago•0 comments

Lufthansa cuts 20k flights to save money, fuel

https://www.upi.com/Top_News/World-News/2026/04/21/lufthansa-flight-cuts/6391776813766/
2•petethomas•4m ago•0 comments

Cursor partners with SpaceX on model training

https://cursor.com/blog/spacex-model-training
2•gzer0•7m ago•0 comments

NASA's Webb Helped Rule Out Asteroid's Chance of 2032 Lunar Impact

https://science.nasa.gov/blogs/webb/2026/03/06/how-nasas-webb-helped-rule-out-asteroids-chance-of...
1•mooreds•12m ago•0 comments

Drunk Post: Things I've Learned as a Senior Engineer

https://luminousmen.substack.com/p/drunk-post-things-ive-learned-as
4•zdw•15m ago•1 comments

Bloom filters: the niche trick behind a 16× faster API – Blog – incident.io

https://incident.io/blog/bloom-filters
5•birdculture•16m ago•0 comments

Enriching MMDB files with your own data using Go (2020)

https://blog.maxmind.com/enriching-mmdb-files-with-your-own-data-using-go/
1•mooreds•21m ago•0 comments

Developing Theory about the Development of Theory [pdf]

https://mintzberg.org/sites/default/files/article/download/developing_theory_about_the_developmen...
3•rzk•25m ago•0 comments

How Much Do GPU Clusters Cost?

https://newsletter.semianalysis.com/p/how-much-do-gpu-clusters-really-cost
2•stosssik•26m ago•0 comments

New Lazarus Apt Campaign: "Mach-O Man" macOS Malware Kit Hits Businesses

https://any.run/cybersecurity-blog/lazarus-macos-malware-mach-o-man/
1•lnguyen•29m ago•0 comments

Fuck you, pay me" by mike monteiro

https://www.youtube.com/watch?v=jVkLVRt6c1U
1•fuzztester•29m ago•1 comments

AI bot buying what agents can buy in 2026

https://dialtoneapp.com/2026/april/ai-bot-buying-report
2•fcpguru•30m ago•0 comments

US Criminally Charges Southern Poverty Law Center, Blanche Says

https://www.reuters.com/world/us-criminally-charges-southern-poverty-law-center-blanche-says-2026...
5•petethomas•35m ago•0 comments

Does your boss have AI brain?

https://www.milkkarten.net/p/boss-obsessed-ai-marketing
4•coloneltcb•39m ago•0 comments

Google Ads Keeps Marking My Site Compromised

3•earonesty•40m ago•0 comments

Single-minded pursuit of profit can get firms in trouble. Same thing with AI

https://news.harvard.edu/gazette/story/2026/04/single-minded-pursuit-of-profit-can-get-firms-in-t...
2•lukaspetersson•40m ago•0 comments

The Next Era of Software Architecture Is Data-First

https://aimdb.dev/blog/data-driven-design
2•lukastyrychtr•53m ago•0 comments

Ask HN: Are there any engineering orgs that use incentives?

2•jppope•54m ago•1 comments

Claude Code is no longer a part of the Pro plan

11•csoham•55m ago•0 comments

SpaceX cuts a deal to maybe buy Cursor for $60B

https://www.theverge.com/science/916427/spacex-cursor-potential-deal-acquisition
2•htrp•56m ago•1 comments

BYD Looking to Open 20 Dealerships in Canada This Year

https://gmauthority.com/blog/2026/04/byd-looking-to-open-20-dealerships-in-canada-this-year/
2•whynotmaybe•59m ago•0 comments

Apple has an opportunity to rediscover humanity

https://www.theregister.com/2026/04/21/apple_ternus_rediscover_humanity/
3•LorenDB•1h ago•1 comments

Show HN: Agent Brain Trust, customisable expert panels for AI agents

https://github.com/bahulneel/agent-brain-trust
2•bahulneel•1h ago•0 comments

Show HN: Linux installer .exe without pendrives (secure-boot compatible)

https://www.1clicklinux.org/
2•arusekk•1h ago•0 comments

Show HN: Verdure Demo (Steam PC)

https://store.steampowered.com/app/4069810/VERDURE/
1•sakamotosan•1h ago•0 comments

Highlights from Git 2.54

https://github.blog/open-source/git/highlights-from-git-2-54/
2•thunderbong•1h ago•0 comments

SpaceX says it has option to acquire Cursor for $60B

https://www.reuters.com/technology/spacex-says-it-has-option-acquire-startup-cursor-60-billion-20...
10•jbredeche•1h ago•1 comments

MARISKS warns of scam messages offering ships safe transit through Hormuz

https://www.reuters.com/world/middle-east/scam-messages-offering-ships-safe-transit-through-hormu...
1•petethomas•1h ago•0 comments