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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!

Per-request emotion steering for vLLM, with batching preserved

https://github.com/eigenweltlabs/emotion-steering
1•ChrisPoensgen•11s ago•0 comments

Scaling GPU DataFrames: Why Bodo's SPMD Architecture Outperforms Task-Based Engi

https://www.bodo.ai/blog/scaling-gpu-dataframes-why-bodos-spmd-architecture-outperforms-task-base...
1•marquisdepolis•32s ago•0 comments

Build a Boring Business

https://www.hauser.io/build-a-boring-business/
1•bkfh•1m ago•0 comments

Computer Use Is 45x More Expensive Than Structured APIs

https://reflex.dev/blog/computer-use-is-45x-more-expensive-than-structured-apis/
1•palashawas•1m ago•0 comments

Some meteorite realities

https://sites.wustl.edu/meteoritesite/items/some-meteorite-realities/
1•Tomte•1m ago•0 comments

GitVision – Blast radius and duplicate detection for any GitHub repo

https://gitvision.net
1•coffeejones•2m ago•0 comments

Show HN: Unreal Engine 5 WebGPU implementation [video]

https://www.youtube.com/watch?v=I31ICNNz3Ps
2•astlouis44•2m ago•0 comments

Meteorites and Their Properties

https://www.lpi.usra.edu/science/kring/epo_web/meteorites/toc.html
1•Tomte•2m ago•0 comments

AIMP is going to be cross-platform (Linux Support Is Coming)

https://aimp.ru/blogs/?p=1523
2•SweetSoftPillow•3m ago•0 comments

Human-to-human transmission suspected on board hantavirus cruise ship, WHO says

https://www.cnn.com/2026/05/05/africa/cruise-ship-hantavirus-who-intl
2•koolhead17•4m ago•0 comments

Show HN: Pathetic – Java pathfinding: 10k concurrent paths in ~7ms

https://github.com/bsommerfeld/pathetic
2•bsommerfeld•5m ago•0 comments

Fix "Copy Fail" before your Linux system gets sick

https://opensourcewatch.beehiiv.com/p/fix-copy-fail-before-your-linux-system-gets-sick
2•CrankyBear•5m ago•0 comments

Trust Is the Bottleneck

https://blog.reqproof.com/p/engineerings-ai-bottleneck-is-trust
2•LeonidBugaev•6m ago•0 comments

I Miss Craft

https://eliothertenstein.com/notes/on-craft
3•eiiot•6m ago•0 comments

Epic Semi RISC-V server products

https://www.epicsemi.com/products/contrail/contrail-compute/
1•rwmj•6m ago•0 comments

Comparisons as Predictable as the Sunrise

https://pudding.cool/2026/05/similes/
1•usrme•6m ago•0 comments

Stop Apologizing for Big PRs

https://theendofcoding.com/blog/stop-apologizing-for-big-prs
2•nbouvrette•7m ago•0 comments

The Impossible Things We Have to Believe

https://berthub.eu/articles/posts/the-impossible-things-we-have-to-believe/
3•TechTechTech•9m ago•0 comments

Show HN: I built a simple way to create an online work profile

https://klypn.com
2•chresko•10m ago•0 comments

OurCar: Making an App Just for Us

https://mendelgreenberg.com/posts/ourcar/
2•chabad360•10m ago•0 comments

Detection of an atmosphere on a trans-Neptunian object beyond Pluto

https://www.nature.com/articles/s41550-026-02846-1
4•droidjj•13m ago•0 comments

Apple's First Phone Design Never Made It to Market (2014)

https://lowendmac.com/2014/apples-first-phone-from-1983-never-made-it-to-market/
3•downbad_•15m ago•1 comments

Why India's Space-Tech Startups Are Stuck in a Low-Revenue Orbit

https://www.outlookbusiness.com/magazine/why-indias-space-tech-start-ups-are-stuck-in-a-low-reven...
2•rustoo•15m ago•0 comments

A new way to snap your windows on macOS

https://www.patreon.com/posts/macsyzones-3-0-157387651
3•rohanrhu•16m ago•0 comments

New Star Wars Viewing Data Shows a Deep Generational Divide

https://www.denofgeek.com/tv/new-star-wars-viewing-data-shows-deep-generational-divide/
2•rustoo•16m ago•0 comments

Track movies, TV, and books with editorial reviews

https://cuev.io/
2•axivuslabs•17m ago•0 comments

TPM 2.0 Sealing Policies with WolfTPM

https://www.wolfssl.com/tpm-2-0-sealing-policies-with-wolftpm-pcr-policies-policy-authorize-and-n...
2•aidangarske•19m ago•0 comments

The Curve and the Cliff: What AI Builders Cannot Prove

https://btriani.medium.com/the-curve-and-the-cliff-913e94590808
2•btriani•19m ago•0 comments

Show HN: SecretEnv – Run any process with secrets from all your backends

https://github.com/TechAlchemistX/secretenv
4•techalchemist•20m ago•4 comments

Spirit Airlines Didn't Crash – It Was Taken Down

https://www.thebignewsletter.com/p/who-killed-spirit-airlines
2•fragmede•21m ago•0 comments