KOSISOCHUKWU WILLIAMS

TaxPorta – Tax Management Platform TaxPorta is a digital tax management platform developed for the Federal Capital Territory Internal Revenue Service (FCT-IRS). It helps individuals, businesses and government administrators manage tax-related activities through a single platform. My Role: Product Designer / Design Lead I worked on the product as part of a two-designer team and later took responsibility for leading its design. One of the main challenges was simplifying the onboarding process. The existing experience required users to complete eight steps before they could access the platform, which made registration unnecessarily complicated. I redesigned the onboarding experience, reducing it from eight steps to four. I also worked on taxpayer dashboards, tax-filing journeys, administrative workflows and role-based access for different user groups. Following the launch, I gathered feedback from 10 individual taxpayers and five businesses, using their experiences to identify areas that needed improvement. Results Reduced onboarding steps by 50%, from eight to four. Increased overall onboarding completion by 70%. The platform onboarded over 100,000 users within its first three months and reached approximately 1 million users overall during my involvement. TaxPorta generated over ₦3 billion in revenue during the period. What I worked on: UX research, user flows, information architecture, wireframing, interaction design, UI design, prototyping, usability testing and developer handoff. Full case study: https://www.twine.net/signin

• Product Designer
• UI Designer
• UX Designer

Sendsile – Cross-Border E-commerce Platform Sendsile is a cross-border e-commerce platform that allows people living abroad to purchase groceries and other services for their families and loved ones back home. My Role: Product Designer I worked on designing the customer experience, from onboarding and exploring available products to placing orders and completing checkout. The goal was to make the ordering process easier for customers who were shopping from another country and needed a reliable way to purchase items for people back home. I designed the onboarding experience, customer dashboard, product selection and checkout flows. I also worked on simplifying the ordering process, making it easier for customers to find what they needed, review their orders and complete payments. Working with the product and engineering teams, I refined the user journeys and prepared the designs for implementation. Results Checkout completion increased by 85% during my involvement. The platform recorded over 50,000 users and 10,000 orders within its first three months. Generated over ₦50 million in revenue within the first three months. Recorded repeat purchases and returning customers. What I worked on: Product design, UX research, user flows, information architecture, wireframing, UI design, interactive prototyping, checkout optimisation, and developer handoff. Full portfolio: https://www.twine.net/signin

• Product Designer
• UI Designer
• UX Designer

NRS E-Invoicing – Enterprise Tax Compliance Platform NRS E-Invoicing is a digital invoicing platform designed to help businesses manage electronic invoices and meet tax compliance requirements in Nigeria. My Role: Product Designer I worked on designing the onboarding and invoicing experiences for businesses using the platform, including merchants, buyers and organizations managing large volumes of invoices. One of the challenges was making the invoicing and compliance processes easier to understand, particularly for businesses working with different accounting and enterprise systems. I designed business onboarding, merchant and buyer journeys, invoice management interfaces and workflows involving Invoice Reference Numbers (IRN), QR codes and API-related processes. I also worked on vendor management and invoicing experiences connected to enterprise systems such as SAP, Oracle and QuickBooks. My focus was on organizing complex requirements into clear user journeys and interfaces that businesses could understand and use without unnecessary complications. I collaborated with the wider product and engineering teams to translate business and compliance requirements into designs ready for implementation. Results The platform onboarded over 20,000 businesses. Over 10 billion individual invoices were recorded during the period covered by the project. Designed workflows supporting electronic invoicing, invoice verification and business compliance. Contributed to the design of invoicing experiences involving enterprise accounting and ERP systems. What I worked on: Product design, enterprise UX, B2B SaaS, user flows, information architecture, business onboarding, interaction design, UI design, prototyping, requirements analysis and developer handoff. Portfolio: https://www.twine.net/signin

• Product Designer
• UI Designer
• UX Designer