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Bun vs Deno vs Node.js: Which Runtime Should You Actually Use?

Bun, Deno, and Node.js are not just three speed scores. They are three different bets on compatibility, security, and how much JavaScript tooling your runtime should replace.

HealthTech

Wearables and Health Data: HealthKit, Google Fit, and the Accuracy Trap

The step count is a polite fiction. It disagrees across devices, double-counts, arrives late, and is sometimes a washing machine. A builder's guide to the messy substrate under every fitness app: HealthKit and Health Connect, the accuracy trap, and the reconciliation layer you design on purpose.

Design

Best AI Tools for UX Research in 2026: Maze, Dovetail, UserTesting, Outset, and Notion AI

AI-moderated research sounds like a shortcut until the synthesis quotes a user who never said it. A designer's guide to the five tools, scored on the one thing that matters: does it cite its sources.

AI agents

The YC Batch That Barely Hires: What Spring 2026 Says About the Cost of Software

Four days before Demo Day, 34 of 196 companies in YC's Spring 2026 batch were hiring anyone at all. A look at the batch that builds with agents and almost no people, and what it means if you sell engineering work.

Python

RLS for Agents: Row-Level Security in LangGraph and Multi-Tenant LLM Workflows

An agent we shipped last quarter returned a row from the wrong tenant. The agent did what the prompt asked. The database did what the agent asked. The third jurisdiction of every agentic workflow is the database, and Pydantic and TypedDict cannot reach it.

FinTech

How a Loan Marketplace Actually Works: Soft Search, Matching, and Who Gets Paid

A loan marketplace never lends anyone money. It routes a borrower to whoever will, gets paid for the introduction, and the entire product is the routing. Here is how the soft search, the matching engine, and the payout actually work, from someone who has built one.

FinTech

Earned Wage Access: How It Works, and the CFPB Line That Decides If It's a Loan

Every earned wage access app says the same three words: not a loan. Since December 2025 the CFPB has drawn an exact four-part line around which products get to say that honestly, and almost none of the popular ones clear it. Here is the line, and what it means to build on either side of it.

FinTech

Alternative Credit Scoring, Explained: How Gamified and Behavioural Scores Work

A gamified credit score is not your bureau score. It is the lender's own number that rises when you repay well and falls when you don't, and it gates your next loan. Where it sits inside alternative credit scoring, and what it takes to build one that is hard to game.

FinTech

Open Banking Underwriting in 2026: Building Loan Risk Models from Real Cashflow

The modern loan risk model is not a credit-score lookup. It reads a borrower's actual cashflow through open banking, decides affordability in minutes, and has to explain itself afterward. Here is how that decision engine is built, from someone who has shipped them.

FinTech

How to Build a Digital Lending Platform in 2026: Four Products, One Phrase

Build me a loan app means four different products. Here is how to pick the right one, what to actually build (soft search, open-banking matching, gamified scoring), and the FCA and CFPB rules that shape all of it.

AI development

Real-Time Market Data and Trading Infrastructure: Sub-Second Sync Without Lying to the User

A quote half a second stale is a quote that is wrong. A price that disagrees between the web and the app is a support ticket and a trust problem. Streaming market data at scale is a data-integrity bar, not just a websocket.

AI development

Financial-Data Pipelines: Open Banking, Aggregation, and the Schema Drift That Breaks the Math

You wire up open-banking aggregation, ship, and three months later a bank renames one field and your money-leak detector quietly returns zero while every chart still renders. Aggregating financial data is a normalization and drift-detection problem before it is a feature.