Side Project Product Thinking Rapid Prototyping Global FinTech

Three Passports. Three Countries. One Night.
How Do You Invest Across All Three?

My daughter holds Nigerian, Jamaican, and American passports. She visited all three countries before she turned one. Her future is not anchored to any single economy and every existing savings tool I found assumed it was. What started as a real planning question - how do you invest in a child's future across borders without limiting her to the U.S.? - became a free, multi-country, inflation-adjusted family investment simulator covering 30 countries across 6 continents. No marketing budget. No engineering team. Just a clear problem and a night of focused execution.

32
Active users on Day One - zero marketing
30
Countries covered across 6 continents
<12h
From idea to live deployment
32
Users on Day One · Zero marketing
30
Countries covered
6
Continents represented
<12h
From idea to live deployment
0
Lines of code written manually
Free
No login. No paywall. No data stored.
Role
Product Owner
Project Type
Independent Product
Duration
Under 12 Hours
Launched
March 2026
Data Sources
IMF, World Bank, FocusEconomics, Macrobond

A new parent. A simple question. No tool that answered it properly.

My daughter holds three passports: Nigerian, Jamaican, and American. She visited all three countries before she turned one. That is not a fun fact. It is a financial planning reality with no good tooling behind it. The question I kept coming back to was simple: how do you invest in her future across borders without limiting her to the U.S.? Every savings calculator I found assumed the answer was a 529 plan. That is the wrong answer for a child whose life will likely span three economies, three currencies, and three entirely different investment landscapes. No existing tool handled this. The scope expanded almost immediately - if I needed this, so did every other parent navigating cross-border family finance.

01
Existing Tools Were Single-Country
Every savings calculator online served one market. U.S.-centric design excluded the majority of global parents who think across borders, currencies, and economic environments.
02
No Inflation Sensitivity for Real Decisions
Showing a future balance of N50 million in 2045 means nothing without context. High-inflation countries like Nigeria (16.2% 10-year average) require purchasing-power-adjusted projections to be useful planning tools.
03
Multi-Child Planning Was Completely Absent
Most families are planning for more than one child across different starting ages and saving capacities. No mainstream tool modelled this. Every parent was manually running multiple separate simulations and trying to mentally aggregate them.
04
Investment Vehicles Were Not Localised
A Nigerian parent saving via treasury bills operates under completely different return dynamics than a UK parent using an ISA or an Indian parent using a PPF account. Generic return assumptions produced meaningless projections for most of the world's parents.

One simulator. Every parent's reality. Built on verified data.

The product decisions were made the same way I make them at enterprise scale: start with user context, eliminate assumptions, and build for the broadest plausible user, not the most convenient one. A Kenyan parent with two children in different age brackets saving across two investment vehicles should get the same precision as a U.S. parent planning a 529.

01
🌍
30-Country Coverage Across 6 Continents
Country selection drives the entire model: local currency, inflation rate, cost-of-living increase, and available investment vehicles. Coverage spans North America, Europe, Africa, Asia, South America, and Oceania. Emerging-market economies including Nigeria, Ghana, Kenya, India, Brazil, and Egypt are treated with the same fidelity as the United States, United Kingdom, and Australia. No country is approximated with another country's data.
02
📊
Inflation-Adjusted "Worth in Today's Money" Toggle
Future balance figures are only meaningful when inflation is accounted for. Every projection can be toggled between the nominal future account balance and the real purchasing-power-adjusted equivalent in today's money. For high-inflation economies, this toggle is the difference between a useful planning tool and a false sense of security. Inflation rates are 10-year historical averages from IMF and World Bank data rather than single-year figures that skew results.
03
👶
Multi-Child, Multi-Country Modelling
Each child is modelled independently with their own starting age, contribution amount, investment vehicle, and optionally a different country from the household default. Two parents and up to multiple children can be modelled in a single run. Single-parent households are fully supported. The architecture does not assume a nuclear Western family unit. It supports the range of family configurations that actually exist globally.
04
🏦
Localised Investment Vehicle Return Rates
Return assumptions are sourced from long-run historical nominal averages per country and per vehicle class, not a single global equity assumption. Nigerian Treasury Bills, UK ISAs, Indian PPF accounts, U.S. index funds, South African unit trusts, and Australian superannuation each carry their own validated return rate derived from academic research, IMF, World Bank, and publicly available index performance data.
05
⚙️
Monthly Compounding with Accurate Calculation Methodology
Portfolio values compound monthly rather than annually, which more accurately reflects how contributions and growth interact over long time horizons. The real growth rate applies the Fisher equation: (1 + nominal return) divided by (1 + inflation) minus 1. The methodology is fully disclosed in the tool's disclaimer section, building trust with financially literate users who would notice simplified approximations.
06
🔒
No Login. No Data Storage. Permanently Free.
The product philosophy is zero friction. No account creation, no email capture, no data stored server-side, no paywall at any feature level. The tool runs entirely client-side. This decision was deliberate: financial planning tools that ask for data before they deliver value lose the users who need them most. Accessibility is the product.
She has three passports and visited three countries before she turned one. The question was not which country to save in. The question was how to do all three without a tool built for exactly that. So I built one.
Product Origin - Family Wealth Simulator, March 2026

Overnight. Intentionally scoped. Shipped clean.

The entire build cycle from initial concept to live deployment ran inside 12 hours. This was not reckless speed. It was disciplined scoping: identify the core user need, define the minimum viable feature set that genuinely serves that need, and ship it. Every feature in the tool earned its place through a deliberate inclusion decision, not scope creep.

Night 1 - Concept and Scope
Problem framing and feature definition
Mapped the exact user need: a parent planning cross-border savings for multiple children with real inflation context. Decided on country scope, investment vehicle localisation, and the real vs. nominal toggle as the core differentiating features. Wrote the data sourcing requirements before any code was touched.
Night 1 - Data Architecture
Country, inflation, and vehicle data modelling
Sourced and validated 30-country inflation rates using IMF and World Bank 10-year averages, cross-referenced via FocusEconomics and Macrobond. Built the investment vehicle return rate dataset per country using academic research and publicly available index performance data. Data quality was treated as a product deliverable, not a background task.
Night 1 to Morning - Build
Full feature implementation and calculation engine
Built the multi-child modelling interface, monthly compounding engine, country-switching logic per child, the real vs. nominal toggle, year-by-year breakdown table, and key savings milestones output. Each feature was tested against known values to validate calculation accuracy before the next feature was added.
Morning - Deployment and Distribution
Live on olu-duro.com. Shared via one WhatsApp message.
Deployed under the BeadsGuy LLC portfolio on olu-duro.com. Shared in a single WhatsApp group of friends with no further promotion. By end of day: 32 active users on a 28-day rolling window, all acquired that day, zero marketing spend, zero paid distribution.

Day one. One WhatsApp message. Zero marketing budget.

These are first-day numbers from a tool shared in a single WhatsApp group, with no advertising, no paid distribution, and no social media campaign. The organic reach signals that the tool addressed a real, underserved need. Users do not forward tools that do not resonate.

32
Active users on launch day - single WhatsApp group, no paid reach
30
Countries modelled with local data - IMF / World Bank sourced, not approximated
<12h
Concept to live deployment - scoped, built, tested, shipped
0
User data collected or stored - by design, no login, no tracking
Free
Access model, permanent - no paywall at any feature level
6
Continents covered - emerging markets treated with full fidelity

What real users said. On day one. Unprompted.

These are verbatim reactions from the WhatsApp group where the tool was first shared. No survey. No prompted review request. Just the unfiltered responses from people who opened the link, ran their numbers, and responded in real time. This is what product-market fit looks like before you have a product name.

32
Active users on launch day
Google Analytics · March 21, 2026
1
WhatsApp message sent
Total distribution effort on day one
$0
Marketing spend
Zero paid acquisition. Pure organic pull.

Product craft is not defined by team size or budget.

This project was never intended as a portfolio piece. It was built because my child exists and I needed a better planning tool. What it demonstrates about how I work is honest and direct: I scope clearly, I treat data quality as a product requirement, I make deliberate inclusion decisions, and I ship. Those habits do not change at enterprise scale. They scale up.

Scope Discipline Over Feature Volume
Every feature in the simulator was a deliberate decision. The multi-child model, the real vs. nominal toggle, the 30-country coverage. Each one earned its place. Features that did not serve the core user need were cut before they were built. That discipline is more valuable than engineering hours.
Data Quality Is Product Work
Using 10-year average inflation rates instead of single-year figures, sourcing per-country investment vehicle returns from academic and institutional data, disclosing methodology in the disclaimer. These decisions were made before a single line of code was written. Good product decisions are upstream of execution.
Accessibility Is the Product
No login. No email gate. No paywall. No data stored. These were not afterthoughts. They were the first product decisions made. A financial planning tool that asks for something before it gives anything back loses the users who need it most. Removing barriers is product strategy.
Real User Pull Beats Manufactured Distribution
32 users from one WhatsApp message means the tool is shareable. People do not forward things that do not solve a real problem. Organic reach from a single distribution point on day one is a stronger product signal than a paid campaign that acquires passive impressions.
Speed and Quality Are Not Opposites
Sub-12-hour delivery does not mean cutting corners. It means making fast decisions confidently when the scope is clear. The calculation methodology is sound. The data is validated. The disclaimer is thorough. Quality is maintained by deciding clearly, not by going slowly.
Personal Use Cases Are the Best Starting Point
My daughter has three passports and visited three countries before turning one. That specific, personal, irreducible fact produced a product requirement no market research session would have surfaced. The sharpest discovery insight is always: what would I actually need if I were this user? In this case, I was. And the product followed directly from that.

Want to see the tool? Or talk about building something?

The simulator is live, free, and works for any family in any of the 30 countries covered. If you are interested in how I think about product, let's talk.

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