Pricing freelance dev work: the math behind rate calculators
Pricing freelance dev work: the math behind rate calculators Your freelance rate isn't a guess, a vibe, or what the last client offered. It's four i…
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How we compute session VWAP from 1-minute bars when the data feed does not give you one
Our stock app showed a "VWAP" number for every ticker. For a while that number was a lie. This is a short write-up of how we found out, and how we n…
Pairing inter-account transfers across bank statements with pandas
To pair inter-account transfers across bank statements, match each outflow to an inflow of the same absolute amount , in a different account , withi…
Writing a transaction CSV that Google Sheets imports correctly: locale, decimals and formula injection
To write a transaction CSV that Google Sheets imports cleanly, follow four rules : quote per RFC 4180, write amounts as plain numbers with two decim…
A date is not a version: strict parsing under OSV ranges
A vulnerability range is a claim about ordering, and it is worth no more than the version parser sitting underneath it. Walk an OSV range's events i…
React Frontend Plus NodeJS Backend Error Capture for Tenant Cohort Incident Reconstruction
A thin correlation layer beats a large monitoring rollout when the immediate job is reconstructing which tenant cohort saw a fintech experiment fail…
Изучаем ИИ в финтехе: чего на самом деле хотят пользователи и разработчики
Разные ИИ‑ассистенты появились в финтехе уже давно: в любом банковском приложении минимум по одному такому. А вот чем они станут…
Europe SMS Alert API — Sender Registration for Loan Application Updates
Short answer: evaluate SMS alert API alternatives for Europe as replaceable transports, not as the record of a lending decision. The least complex w…
Ledger errors should name the invariant they protect
A payout worker catches an exception from the ledger and has to decide, with no human in the loop, whether to retry the request, park it, or escalat…
Vom Bankkonto zum Handyvertrag: Wie Revolut in Deutschland aufholen will
Mit einem Handytarif erschließt sich Revolut ein neues Geschäftsfeld in Deutschland. Doch um neue Kunden in Deutschland zu gewinnen, verfolgt Wachst…
Who Authenticated the Agent? Building Identity for AI That Acts on a Customer’s Behalf
Who Authenticated the Agent? Building Identity for AI That Acts on a Customer’s Behalf A customer asks an AI assistant to pay an invoice. The assist…
What regulators, banks and consultancies say about controlling AI agent spending (11 documents, 2026)
Disclosure: I work on Pink Agentic AI Payments at PinkWallet, a spend-control layer for AI agents. None of the documents below mention Pink; they ar…
Why Payment Rails Cannot Let Autonomous Agents Carry Raw Credit Cards
At TechCrunch Disrupt 2026, American Express announced what it calls the Intent Intelligence Framework. Part of their Agentic Commerce Experiences d…
Connecting MetaTrader 5 to Your Own Backend: 4 Architectures Compared
Sooner or later every serious MetaTrader project hits the same wall: the logic you need doesn't fit inside one Expert Advisor. You want a risk engin…
Coinbase's Fraud Agent Never Decides Anything. That's Why It Works.
Coinbase's Fraud Agent Never Decides Anything. That's Why It Works. On October 7–8, 2026, Coinbase published Owning Intelligence , a three-part engi…
Combining Automated Payment Rails with Human Fallback
Designing one transaction lifecycle that can move safely between API-based payouts and operational fulfillment. Payment coverage is rarely uniform.…
Separating Available, Held, Actual, and Displayed Balances
Why one balance field cannot represent every financial truth in a virtual-account product. “What is the balance?” sounds like a simple question unti…
Make a coin selection impossible to construct wrong
The wallet bugs that lose fees do not live in the selection strategy. They live in the seam between that strategy and the transaction builder. You g…
Polite Overdue-Invoice Reminders With a Human Gate: An Accounting-Software-Neutral Workflow
Disclosure: I run NxFlowAI, an automation agency serving Australian businesses remotely from Mumbai. The pattern works with any accounting software…
Your Asset List Needs a Jurisdiction Column: Modeling ESMA's Exit-Only Stablecoin Rules
On October 8, 2026, ESMA published an opinion telling MiCA-authorised crypto service providers to stop offering services for non-MiCA-compliant stab…
DER SET ordering: enforce it in the walk, not in a check afterwards
A SET in ASN.1 is unordered by definition: the arrangement of its components carries no meaning. DER still fixes exactly one arrangement on the wire…
Building UPI Payments Into Your App in 2026: What Razorpay, Cashfree, PayU and Autopay Actually Cost You
If you're wiring UPI into an Indian app right now, the engineering decisions you make this month will hit your margins differently after October 15,…
The Happy Path Is Lying to You: What Production Systems Taught Me About Idempotency, Reversals, and Financial Truth
There is a point where a software project stops being "an app." The UI might still look the same. There are forms, tables, buttons, APIs, and databa…
My quote feed returns two premium numbers. I only show one when they agree.
Over a week-long holiday I built a small dashboard for a narrow problem: investors in mainland China who want US index exposure. The context: many o…
Slovak Company Data via API: RPO Lookups by IČO or Name, as JSON (2026)
Slovak Company Data via API: RPO Lookups by IČO or Name, as JSON (2026) Slovakia's Register of Legal Entities (Register právnických osôb, RPO) is op…
Estonian Company Data via API: e-Business Register Lookups by Registry Code, KMKR or Name (2026)
Estonian Company Data via API: e-Business Register Lookups by Registry Code, KMKR or Name (2026) Estonia publishes its company register as open data…
How to generate an EPC payment QR code (GiroCode) for your invoices
If you send invoices to customers in Germany, Austria, the Netherlands or Belgium, you have probably seen a small QR code labelled "GiroCode" or "Za…
Better Uptime Monitoring for Small SaaS API and Cron Healthchecks
Short answer: monitor the public API and the scheduled import as two different promises. Use an external request check for reachability, and emit a…
Cheap App Logging for Small SaaS: Compare Hosted and Self-Hosted Failure Signals
Short answer: for a small SaaS notification service, the best inexpensive logging choice is the one that preserves enough evidence to reconstruct a…
A strict DER reader needs a calendar, not a clock
The validity period is the only part of a certificate written as text. Everything else DER encodes is bytes with structural rules (a length, a two's…