Aarush Tanwar

Gym, Game, Code, Bikes 🔁

[Aarush Tanwar @Thisisaarush]

Node.js 26 enters LTS in October.
Prod should be on 24.x LTS now.

When was the last time a Date bug hit your prod?

📖 https://t.co/i88ZVUdApI

[Aarush Tanwar @Thisisaarush]

The Date object has gaslit JS devs for 30 years.

Months starting at 0. Timezones? Guess work.

Node.js v26 shipped a permanent fix.
Temporal API is now default. No flags. 🧵

[Aarush Tanwar @Thisisaarush]

Also in v26:
Map.getOrInsert() — kills "check then set" boilerplate
Iterator.concat() — chain iterables without arrays

Small changes. Big QoL.

[Aarush Tanwar @Thisisaarush]

I built microservices with isolated DBs.
Thought I was clever.

Turns out I was just doing cell-based architecture badly.

Worth it for payments. Overkill for your todo app.

📖 https://t.co/gX3WIhC7NE

[Aarush Tanwar @Thisisaarush]

One service fails. Whole system goes down.

AmEx decided that wasn't acceptable.
Cell-based architecture. Thread 🧵

[Aarush Tanwar @Thisisaarush]

Static data (currency rates, merchant codes) is
pre-loaded into each cell before transactions arrive.

No cross-cell calls in the critical path. Ever.

Also: logging goes down? Drop the logs.
A log line will never block a payment.

[FIFA World Cup @FIFAWorldCup]

Messi again, again, and again...

#FIFAWorldCup

[Aarush Tanwar @Thisisaarush]

Stack: Next.js 15 + Convex + Google Gemini +
Turborepo monorepo + Clerk auth

Features: embeddable widget, multi-tenancy,
human escalation, session persistence,
knowledge base ingestion, conversation analytics

Live demo + code: https://t.co/GBImR5nADs

[Aarush Tanwar @Thisisaarush]

I built an AI customer support SaaS.
Here's how the RAG pipeline works under the hood 🧵

[Aarush Tanwar @Thisisaarush]

Hardest part: chunking strategy.

Too small → AI loses context between chunks
Too large → blows the LLM context window
Wrong overlap → misses connections across paragraphs

The AI model is the easy part. The data pipeline is where you actually spend your time.

[The Academy @TheAcademy]

One thing about destiny... it doesn't miss. ✨

Film: OM SHANTI OM (2007)

[Aarush Tanwar @Thisisaarush]

AI can write your CRUD, scaffold auth, generate components.

What it can't do:

Know your Postgres falls over at 100k users without read replicas. Catch that microservice boundary creating a distributed transaction problem.

System design is the new moat. Learn it.

[Aarush Tanwar @Thisisaarush]

Aaj ka gyaan -

Few amount of developers don't trust AI-generated code.

That number should be higher.

AI writes the happy path. It skips error handling, misses edge cases, and ignores auth on "obvious" routes.

Use it to go faster. Not to stop thinking.

[Aarush Tanwar @Thisisaarush]

AI agents write better code in clean codebases.

In a legacy monolith with no tests? It confidently generates code that compiles, passes review, and silently breaks production 3 weeks later.

AI amplifies what's already there.
Fix your foundations first. Then bring in the agents.

[Shah Rukh Khan @iamsrk]

#KING is Ready to ROAR on 24.12.2026 in Cinemas

#ItsKingTime
#KingDateAnnouncement

[Aarush Tanwar @Thisisaarush]

We can also call it OCD 😆

[Aarush Tanwar @Thisisaarush]

Window Cleaner 😂 #raycastwrapped