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Mayckon Giovani5d ago • 15 min read
Value Lineage in Fungible Ledgers: Causality, Exposure, and the Limits of Traceability
Abstract Financial systems often need to answer questions that fungible assets were never...
#distributedsystems#fintech#systemdesign#accounting
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polycratia6d ago • 7 min read
Custodial ETH withdrawals: the nonce is a database row, not a node call
A custodial wallet service has to turn a user's withdrawal request into exactly one on-chain...
#python#fintech#crypto#architecture
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Ehsan MahmoudiAug 24, 2026 • 4 min read
A Small Fintech Challenge, and Why I Let Postgres Hold the Money
I took a small fintech-style coding challenge — a marketplace where players buy and auction items wi...
#postgres#go#fintech#concurrency
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polycratiaAug 24, 2026 • 6 min read
The only safe failure state for an outbound payout is unknown
Sending money out of a system is not the mirror image of taking it in. An inbound payment can be...
#python#fintech#crypto#architecture
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polycratia3d ago • 5 min read
Multi-carrier shipping rates are quotes, not prices
The shipping amount a customer sees at checkout comes from a carrier API call that happened seconds....
#python#fintech#crypto#architecture
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John Frandsen3d ago • 4 min read
Open Banking Python Library: What Actually Exists in 2026 (and What I Use Instead)
When I first needed bank transactions inside a Python app, I did what every developer does. I typed....
#python#openbanking#banking#fintech
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Pukar KhanalAug 22, 2026 • 10 min read
I spent three months building Stripe for Nepal, alone
Stripe does not operate in Nepal. Neither does anything with its shape. If you run a business here.....
#fintech#typescript#postgres#nepal
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Aarya ParekhAug 22, 2026 • 4 min read
Building a Real-Time Market Microstructure Analyzer for Indian Equities
Financial markets produce enormous amounts of data—but converting raw order-book updates into...
#python#fintech#react#opensource
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Diego6d ago • 4 min read
Modelando três mercados (BR / US / Cripto) com um só motor de rebalanceamento
Parte de uma série sobre construir o Balance, um app de rebalanceamento de carteira, como dev...
#django#arquitetura#python#fintech
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GEX.live4d ago • 2 min read
How fast do dealers hedge SPX 0DTE flow? We measured it: 2-3 minutes
Every dealer-positioning story assumes the same mechanism: customers force option delta onto dealers...
#analysis#data#fintech
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GEX.live4d ago • 2 min read
What is SPX option flow actually made of? A fifth still trades on a physical floor
Every print on the SPX options tape carries an OPRA condition code naming the pipe it came through:....
#analysis#data#fintech
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OM bhardwaj2d ago • 2 min read
real payment gateway
🚀 Building My Own Payment Gateway — From API to Real Payment Infrastructure Most...
#api#backend#fintech#infrastructure
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Doaa H AlshawwaAug 22, 2026 • 3 min read
How I Stop Webhook Replay Attacks in Node.js & PostgreSQL
A practical guide to handling payment webhooks securely using HMAC signature checks, timestamp windo...
#security#node#postgres#fintech
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Diego6d ago • 3 min read
Modeling three markets (BR / US / Crypto) with one rebalancing engine
Part of a series on building Balance, a portfolio rebalancing app, as a solo developer. Balance...
#django#architecture#python#fintech
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Jack Ma6d ago • 7 min read
How to Convert CSV or Excel to a NACHA ACH File — and Validate It Before Upload
A CSV file is easy to inspect. A NACHA ACH file is not. At first glance, an ACH file looks like a.....
#tutorial#webdev#javascript#fintech
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SaxonFletcher2366Aug 22, 2026 • 7 min read
Compliance Welcome Email: API Templates, Domain Verification, and Audit Retrieval
Short answer: For a fintech compliance welcome email, keep the regulated template and audit record i...
#email#fintech#observability
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力智栩Aug 24, 2026 • 3 min read
D10：實驗走完三分之一，他已經六個交易日沒下單
30 個交易日的實驗，今天收在第 10 天。阿富的帳戶裡有 36 股 00919，券商可用現金 1,089 元，持股市值 1,103 元，合計 2,192 元。本金 2,200。十天下來帳面少 8.....
#fintech
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John Frandsen3d ago • 5 min read
Tink Alternatives in 2026: An Honest Developer's Comparison
Most people searching for a Tink alternative aren't angry at Tink. The coverage is real, the docs ar...
#openbanking#psd2#fintech#api
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Andrew Sarr6d ago • 5 min read
I'm building an open-source, Pix-inspired instant-payment foundation in Rust - and it needs contributors
Brazil solved instant payments. In 2020, the Banco Central do Brasil shipped Pix: send money to...
#rust#opensource#fintech#showdev
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David5d ago • 7 min read
The Wire
How Money Learned to Travel at the Speed of Light The Money Stack — Episode 2 of 10 In...
#fintech#techtalks#banking#software
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Ram Kl5d ago • 6 min read
Loan API Orchestration vs. API Aggregation: Why the Architecture Decision Determines What Your Lending Stack Can Actually Do
Your engineering team can build an API aggregation layer in four to six weeks. It will pull data fro...
#fintech#embeddinglending#loanorigination#apiaggregationlayer
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Iurii RoguliaAug 24, 2026 • 12 min read
Expense Report Fraud Detection: The Altered Receipt PDF Your Controls Never Inspect
Expense report fraud detection: your three-way match never inspects the receipt PDF. How tamper dete...
#pdf#fintech#fraud#webdev
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Payout Rail4d ago • 3 min read
ACH Return Code R01: Handling Insufficient Funds in Payout Systems
ACH Return Code R01: Handling Insufficient Funds in Payout Systems The source material about a...
#backend#fintech#software#softwareengineering
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Payout Rail5d ago • 3 min read
Building ACH Return Code Handling Into Your Payout System
Building ACH Return Code Handling Into Your Payout System When a payout fails, your system needs to...
#backend#fintech#software#softwareengineering
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