Nina Castellano

Nina Castellano

Nina Castellano is a digital payments analyst turned writer, based in London. She spent four years at a European fintech startup, where she specialized in cross-border transaction fees, e-wallet ecosystems, and how payment gateways influence top-up costs for gamers and streamers. That behind-the-scenes experience taught her exactly where hidden surcharges hide—and how to avoid them. Now an independent contributor, Nina focuses on making the payment side of top-ups transparent and user-friendly. From comparing PayPal, Apple Pay, and local e-wallet options to breaking down currency conversion markups, she tests every method herself and reports back with clear, actionable findings. Her guiding principle is simple: every pound spent on fees is a pound not spent on the fun.

London
DigitalPaymentsCrossBorderFeesEwalletsFintechForGamers

Experience

Professional Experience

2024 - Present

Payment Specialist

Nina helps users navigate the payment side of top-ups—comparing methods, cutting fees, and maximizing value on every recharge.

2022 - 2024

Freelance Finance & Gaming Writer

Whose practical guides on avoiding hidden payment surcharges have been featured in fintech and gaming publications.

2016-2022

Payment Operations Analyst

Where she spent four years investigating cross-border transaction fees, e-wallet integrations, and payment gateway markups.

Credentials

Certificates & Qualifications

  1. 01

    Certified Payments Professional

    Issued by the Electronic Transactions Association — validating expertise in payment systems, compliance, and cross-border transaction frameworks.

  2. 02

    Google Data Analytics Professional Certificate

    Specializing in transaction data analysis, fee pattern identification, and consumer payment behavior insights.

  3. 03

    AML & Financial Crime Prevention Certificate

    Focused on anti-money laundering regulations and fraud detection in digital payment ecosystems.

Articles by Nina Castellano

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