I am Software Engineer and Quant Developer.

Problem

Visitors need a clear way to discover the gardens, event spaces and services.

Solution

A responsive showcase website presenting the venue and its offerings.

Technologies

HTML, CSS, JavaScript and Node.js.

Architecture

Web presentation layer with responsive pages and a Vercel-hosted public site.

Key features

• Venue and service information
• Responsive page layout

Screenshot

The project preview above shows the website.

Challenges

Presenting the venue clearly across screen sizes and making key information easy to find.

Results

A live digital showcase for Aberdare Gardens.

Problem

Retail teams need one workflow for point-of-sale activity, stock visibility and sales records.

Solution

A cloud-based POS that combines sales, inventory, receipts, reporting and M-Pesa STK Push payments.

Technologies

Flask, PostgreSQL, JavaScript and M-Pesa Daraja API.

Architecture

Flask application backed by PostgreSQL, with payment initiation through Daraja and transaction processing integrated into checkout.

Key features

• Sales tracking and inventory management
• Receipt printing and sales reports
• M-Pesa STK Push payments

Screenshots

The project preview above shows the POS interface.

Challenges

Keeping sales and stock workflows consistent while handling an external payment provider.

Results

A live POS experience is available to explore through the demo link.

Problem

Fundraisers need a straightforward way to publish campaigns, accept contributions and follow progress.

Solution

A crowdfunding platform for individuals, organizations and startups to create campaigns and collect donations.

Technologies

Flask, PostgreSQL, JavaScript and payment API integration.

Architecture

Flask web application with PostgreSQL persistence and an integrated payment flow.

Key features

• Campaign publishing
• Donation and goal tracking
• Payment integration

Screenshots

The project preview above shows the platform interface.

Challenges

Connecting campaign progress with payment activity so users can follow fundraising goals.

Results

A live campaign experience is available to explore through the demo link.

Problem

Buyers and sellers need a shared online place to discover listings and support marketplace activity.

Solution

An online marketplace connecting buyers and sellers through digital listings and transaction tools.

Technologies

Node.js, PostgreSQL, HTML, CSS and JavaScript.

Architecture

Node.js application backed by PostgreSQL for marketplace data.

Key features

• Buyer and seller marketplace
• Listings and e-commerce tools

Screenshots

The project preview above shows the marketplace interface.

Challenges

Structuring marketplace information so products and seller offerings are easy to browse.

Results

A live marketplace demo is available to explore.

Problem

Customers need a convenient online way to order food and pay, while staff need a place to manage incoming orders.

Solution

A food-ordering platform with customer accounts, a cart, M-Pesa checkout and an order-management dashboard.

Technologies

Flask, PostgreSQL on Neon, M-Pesa Daraja API and progressive web app technologies.

Architecture

Flask application and PostgreSQL data store; Daraja payment requests and callbacks connect payment status to the ordering flow. The PWA supports an installable web experience.

Key features

• Food browsing, customer accounts and cart
• M-Pesa payments and payment callbacks
• Order management and admin dashboard
• Installable PWA experience

Screenshots

The project preview above shows the Waterfront Kitchen ordering experience.

Challenges

Coordinating order state with asynchronous payment callbacks and making the customer ordering journey work across devices.

Results

A live food-ordering experience is available to explore.

Problem

Schools need coordinated access to academic, student and fee-management workflows.

Solution

A management portal with separate student, lecturer and administrator workflows.

Technologies

Flask, PostgreSQL, JavaScript and REST APIs.

Architecture

Flask application with PostgreSQL persistence and role-specific dashboards; the described fee flow uses M-Pesa STK Push.

Key features

• Unit registration, timetables and examination results
• Fee statements and M-Pesa STK Push
• Course, grade, finance and records management

Screenshots

The project preview above shows the school portal interface.

Challenges

Separating permissions and workflows across students, lecturers and administrators.

Results

The portal is presented as a project preview; a public live demo is not currently linked.

Research question

Can logistic regression predict the sign of gold's next five-trading-day return well enough to produce a tradable edge over a naive baseline and buy-and-hold?

Method

One logistic regression model, features standardized using training data only, a fixed 0.50 threshold, and no class-imbalance correction. Validation covers 2019–2022. The 2023–2026 test period remains untouched.

Backtest and controls

Non-overlapping five-trading-day positions entered at Open[t+1] and exited at Open[t+6], with 0.02% transaction costs on entry and exit. The strategy trailed buy-and-hold by 3.29 percentage points. A 20-seed shuffled-target control was chance-level (50.00% balanced accuracy on average), while calibration was non-monotonic.

Ledger verification

All 8 transaction identities passed. Entry and exit costs reconciled to actual notionals at 0.072770611; daily marked-to-market equity matched the invested units on every invested day; compounded trade returns reconciled to final daily equity.

Research notebook archive

The photos below document exploratory work in the notebook. They are not the final Stage 9 performance evidence; the audited results above are the final figures.

Audit script

Download the Stage 9 Python audit script. The script expects gold_ml_dataset.csv and gold_daily_full_v2.csv in its working directory; those datasets are not included in this portfolio.