Environment variables are a legacy mess: Let's dive deep into them
https://www.reddit.com/r/programming/comments/1o5j78b/environment_variables_are_a_legacy_mess_lets_dive/

submitted by /u/Low-Strawberry7579 (https://www.reddit.com/user/Low-Strawberry7579)
[link] (https://allvpv.org/haotic-journey-through-envvars/) [comments] (https://www.reddit.com/r/programming/comments/1o5j78b/environment_variables_are_a_legacy_mess_lets_dive/)

There Are No Programmers In Star Trek
https://www.reddit.com/r/programming/comments/1o5rdyg/there_are_no_programmers_in_star_trek/

submitted by /u/Active-Fuel-49 (https://www.reddit.com/user/Active-Fuel-49)
[link] (https://www.i-programmer.info/news/99-professional/18368-there-are-no-programmers-in-star-trek.html) [comments] (https://www.reddit.com/r/programming/comments/1o5rdyg/there_are_no_programmers_in_star_trek/)

Tests Don’t Prove Code Is Correct… They Just Agree With It
https://www.reddit.com/r/programming/comments/1o5rh32/tests_dont_prove_code_is_correct_they_just_agree/

<!-- SC_OFF -->“A test isn’t proof that something is correct, it’s proof that one piece of code behaves the way another piece of code thinks it should behave.” This thought hit me the other day while writing a few “perfectly passing” tests. I realized they weren’t actually proving anything — just confirming that my assumptions in two places matched. When both your implementation and your test share the same wrong assumption, everything still passes. Green checkmarks, false confidence. It made me rethink what tests are even for. They’re not really about proving truth — more about locking down intent. A way to say, “If I ever change this behavior, I want to know.” The tricky part is that the intent itself can be wrong. Anyway, just a random reflection from too many late nights chasing 100% coverage. Curious how you all think about it — do you see tests as validation, documentation, or just guardrails to keep chaos in check? <!-- SC_ON --> submitted by /u/untypedfuture (https://www.reddit.com/user/untypedfuture)
[link] (https://medium.com/@arnonaxelrod/proof-driven-development-or-the-business-value-of-clean-code-b84380ff312e) [comments] (https://www.reddit.com/r/programming/comments/1o5rh32/tests_dont_prove_code_is_correct_they_just_agree/)

AI Won’t Fix Broken Systems: Lessons from the 2025 DORA Report
https://www.reddit.com/r/programming/comments/1o5wxpz/ai_wont_fix_broken_systems_lessons_from_the_2025/

<!-- SC_OFF -->Faster coding doesn’t always mean increased productivity. <!-- SC_ON --> submitted by /u/aviator_co (https://www.reddit.com/user/aviator_co)
[link] (https://www.aviator.co/blog/ai-2025-dora-report/) [comments] (https://www.reddit.com/r/programming/comments/1o5wxpz/ai_wont_fix_broken_systems_lessons_from_the_2025/)

React Compiler v1.0
https://www.reddit.com/r/programming/comments/1o5x90j/react_compiler_v10/

submitted by /u/alexeyr (https://www.reddit.com/user/alexeyr)
[link] (https://react.dev/blog/2025/10/07/react-compiler-1) [comments] (https://www.reddit.com/r/programming/comments/1o5x90j/react_compiler_v10/)

The Story of Codesmith: How a Competitor Crippled a $23.5M Bootcamp By Becoming a Reddit Moderator
https://www.reddit.com/r/programming/comments/1o67ip8/the_story_of_codesmith_how_a_competitor_crippled/

<!-- SC_OFF -->Saw this on theprimeagen stream, thought it would be interested to share. Anyone here who did a codesmith bootcamp? <!-- SC_ON --> submitted by /u/Happy_Junket_9540 (https://www.reddit.com/user/Happy_Junket_9540)
[link] (https://larslofgren.com/codesmith-reddit-reputation-attack/) [comments] (https://www.reddit.com/r/programming/comments/1o67ip8/the_story_of_codesmith_how_a_competitor_crippled/)

Inside Cassandra: The Internals That Make It Fast and Massively Scalable
https://www.reddit.com/r/programming/comments/1o68coy/inside_cassandra_the_internals_that_make_it_fast/

submitted by /u/Sushant098123 (https://www.reddit.com/user/Sushant098123)
[link] (https://beyondthesyntax.substack.com/p/inside-cassandra-the-internals-that) [comments] (https://www.reddit.com/r/programming/comments/1o68coy/inside_cassandra_the_internals_that_make_it_fast/)

We saved 76% on our cloud bills while tripling our capacity by migrating to Hetzner from AWS and DigitalOcean
https://www.reddit.com/r/programming/comments/1o6au24/we_saved_76_on_our_cloud_bills_while_tripling_our/

submitted by /u/hedgehogsinus (https://www.reddit.com/user/hedgehogsinus)
[link] (https://digitalsociety.coop/posts/migrating-to-hetzner-cloud/) [comments] (https://www.reddit.com/r/programming/comments/1o6au24/we_saved_76_on_our_cloud_bills_while_tripling_our/)

How to check for overlapping intervals
https://www.reddit.com/r/programming/comments/1o6el19/how_to_check_for_overlapping_intervals/

submitted by /u/mzl (https://www.reddit.com/user/mzl)
[link] (https://zayenz.se/blog/post/how-to-check-for-overlapping-intervals/) [comments] (https://www.reddit.com/r/programming/comments/1o6el19/how_to_check_for_overlapping_intervals/)

reCAPTCHA migration to Google Cloud by the end of 2025: what do you need to do
https://www.reddit.com/r/programming/comments/1o6gkyj/recaptcha_migration_to_google_cloud_by_the_end_of/

submitted by /u/ribtoks (https://www.reddit.com/user/ribtoks)
[link] (https://privatecaptcha.com/blog/recaptcha-migration-to-google-cloud-2025/) [comments] (https://www.reddit.com/r/programming/comments/1o6gkyj/recaptcha_migration_to_google_cloud_by_the_end_of/)

Introducing Reactive Programming for Go
https://www.reddit.com/r/programming/comments/1o6ieoy/introducing_reactive_programming_for_go/

<!-- SC_OFF -->Start writing declarative pipelines: observable := ro.Pipe( ro.RangeWithInterval(0, 10, 1*time.Second), ro.Filter(func(x int) bool { return x%2 == 0 }), ro.Map(func(x int) string { return fmt.Sprintf("even-%d", x) }), ) <!-- SC_ON --> submitted by /u/samuelberthe (https://www.reddit.com/user/samuelberthe)
[link] (https://github.com/samber/ro) [comments] (https://www.reddit.com/r/programming/comments/1o6ieoy/introducing_reactive_programming_for_go/)

Tritium | Ideas on Glitching in Rust
https://www.reddit.com/r/programming/comments/1o6kzd0/tritium_ideas_on_glitching_in_rust/

submitted by /u/urandomd (https://www.reddit.com/user/urandomd)
[link] (https://tritium.legal/blog/glitch) [comments] (https://www.reddit.com/r/programming/comments/1o6kzd0/tritium_ideas_on_glitching_in_rust/)

Reflecting on the first 6 months of a rewrite (Text Editor)
https://www.reddit.com/r/programming/comments/1o6m0jc/reflecting_on_the_first_6_months_of_a_rewrite/

submitted by /u/levodelellis (https://www.reddit.com/user/levodelellis)
[link] (https://bold-edit.com/devlog/six-months-rewrite.html) [comments] (https://www.reddit.com/r/programming/comments/1o6m0jc/reflecting_on_the_first_6_months_of_a_rewrite/)

Why your boss isn't worried about AI - "can't you just turn it off?"
https://www.reddit.com/r/programming/comments/1o6n17u/why_your_boss_isnt_worried_about_ai_cant_you_just/

submitted by /u/Beyarkay (https://www.reddit.com/user/Beyarkay)
[link] (https://boydkane.com/essays/boss) [comments] (https://www.reddit.com/r/programming/comments/1o6n17u/why_your_boss_isnt_worried_about_ai_cant_you_just/)

Simpler Build Tools with Functional and Object Oriented Programming, Scala Workshop 2025
https://www.reddit.com/r/programming/comments/1o6n8lv/simpler_build_tools_with_functional_and_object/

submitted by /u/lihaoyi (https://www.reddit.com/user/lihaoyi)
[link] (https://www.youtube.com/watch?v=tNsz_dGCsVs) [comments] (https://www.reddit.com/r/programming/comments/1o6n8lv/simpler_build_tools_with_functional_and_object/)

Bots are executing our analytics JavaScript | Bring back old-school access logging
https://www.reddit.com/r/programming/comments/1o6nh2n/bots_are_executing_our_analytics_javascript_bring/

submitted by /u/kixxauth (https://www.reddit.com/user/kixxauth)
[link] (https://neugierig.org/software/blog/2025/09/access-log.html) [comments] (https://www.reddit.com/r/programming/comments/1o6nh2n/bots_are_executing_our_analytics_javascript_bring/)

Cap'n Web: A new RPC system for browsers and web servers
https://www.reddit.com/r/programming/comments/1o6qg6y/capn_web_a_new_rpc_system_for_browsers_and_web/

submitted by /u/Happy_Junket_9540 (https://www.reddit.com/user/Happy_Junket_9540)
[link] (https://blog.cloudflare.com/capnweb-javascript-rpc-library/) [comments] (https://www.reddit.com/r/programming/comments/1o6qg6y/capn_web_a_new_rpc_system_for_browsers_and_web/)

How Clean Commits Make PR Reviews Easier
https://www.reddit.com/r/programming/comments/1o6rbo1/how_clean_commits_make_pr_reviews_easier/

<!-- SC_OFF -->It's no secret that reviewing pull requests is time consuming, and incredibly important. Speeding up reviews, and enabling higher quality reviews, should therefore be a crucial skill for all developers. However, I find the vast majority of PRs to be incredibly unfriendly to reviewers. In this (https://medium.com/@anujbiyani/ai-development-how-clean-commits-make-pr-reviews-easier-ec33f57eda70?source=friends_link&sk=4f1308bb6693f47236fb0da87bef3454) post I wrote about some git commands that will help you craft PRs that are much easier to review. With a bit of practice it ends up being fairly quick to execute on, and your whole team will thank you. <!-- SC_ON --> submitted by /u/fogeyman (https://www.reddit.com/user/fogeyman)
[link] (https://medium.com/@anujbiyani/ai-development-how-clean-commits-make-pr-reviews-easier-ec33f57eda70?source=friends_link&sk=4f1308bb6693f47236fb0da87bef3454) [comments] (https://www.reddit.com/r/programming/comments/1o6rbo1/how_clean_commits_make_pr_reviews_easier/)

From autonomous agents to Human-assisted QA, AI Testing Tools in 2025
https://www.reddit.com/r/programming/comments/1o6si9q/from_autonomous_agents_to_humanassisted_qa_ai/

submitted by /u/cheerfulboy (https://www.reddit.com/user/cheerfulboy)
[link] (https://hashnode.com/blog/ai-testing-tools-2025) [comments] (https://www.reddit.com/r/programming/comments/1o6si9q/from_autonomous_agents_to_humanassisted_qa_ai/)

What’s the most cost-efficient way to run a persistent WebSocket API with auto-scaling and real-time traffic?
https://www.reddit.com/r/programming/comments/1o71amc/whats_the_most_costefficient_way_to_run_a/

<!-- SC_OFF -->I’ve been working on a real-time backend in Go (Gin) that bridges VS Code extensions and mobile clients via WebSocket connections.
The API handles device pairing, authentication, and real-time messaging — acting as a discovery and message broker service between desktop and mobile. Current Architecture Language: Go 1.21 Platform: Google Cloud Platform (auto-scaling instance group) Load Balancer: GCP HTTP(S) LB with sticky sessions (CLIENT_IP affinity) Database: Firestore (NoSQL, auto-scaling) Concurrency: ~200 sockets per instance, up to 3 000 total Scaling Trigger: 75 % CPU utilization Cost Range: $27 – $60 / month Design: Fill-then-spill auto-scaling, in-memory message broker per instance TLS: Google-managed SSL certificates The setup performs well — instances scale automatically, sticky sessions maintain WebSocket persistence, and Firestore handles durable state.
But I’m exploring whether a single Hetzner CPX server could handle the same load more cost-efficiently without losing too much reliability. Programming & Architecture Questions For those who’ve built similar real-time Go or WebSocket systems: How do you decide when to scale out (multi-instance) versus scale up (single powerful node) for concurrent Go services? Have you found Hetzner or similar bare-metal providers more cost-effective for steady WebSocket workloads? Each instance in my design maintains its own message broker and token cache; Firestore stores persistent data. Sticky sessions avoid cross-node coordination — are there hidden scaling pitfalls in this approach? Would adding Redis Pub/Sub or a lightweight state bus actually improve reliability, or just increase complexity and cost? For long-lived WebSockets, has anyone found Kubernetes or Cloud Run cheaper in practice than manually managed VMs? I’m mainly trying to balance cost, reliability, and architectural simplicity as the system scales. <!-- SC_ON --> submitted by /u/vscoderCopilot (https://www.reddit.com/user/vscoderCopilot)
[link] (https://github.com/emirbaycan/vscoder-copilot) [comments] (https://www.reddit.com/r/programming/comments/1o71amc/whats_the_most_costefficient_way_to_run_a/)