Open to opportunities

Bill Lawrence

@billlawrence

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Frontend & Web3 Engineer building secure, high-performance apps with React/Next.js and on-chain payments.

Nigeria

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What I'm looking for

I’m looking for a role where I can build secure, high-performance frontend and Web3 products—owning React/Next.js architecture, payment and auth flows, and scalable on-chain integrations with a collaborative team.

I’m a Frontend & Web3 Engineer with 5 years of experience building secure, high-performance applications across banking, fintech, health-tech, and AI-powered platforms. I focus on modern frontend architecture—React/Next.js, TypeScript, and server-state patterns—so products stay fast, reliable, and easy to extend.

On the frontend side, I’ve shipped real impact through performance and user-facing features. At Sterling Bank, I architected a cross-platform cart synchronization system with optimistic UI and server-driven rollback, built analytics and reporting dashboards using React Query and Recharts, and standardized React Query across the codebase to eliminate redundant requests.

I also lead with growth through quality and delivery. I drove a 65% increase in organic site traffic by implementing scalable SEO architecture in Next.js, and improved production payment flows by integrating internal secure endpoints with Paystack SDK popup and TanStack Query mutation verification to keep frontend state consistent after transactions.

My Web3 depth complements this: I designed and deployed 15+ Solidity smart contracts on BSC, secured them using OpenZeppelin patterns and proactive nonce-based protections, and optimized gas by 20–30% via Hardhat tuning and refactoring. I’ve also integrated on-chain token payment flows alongside real production payment processors, and previously served as team lead during HNG Internship—mentoring a 15-person team to ship a SaaS app and migrate from React to Next.js for SSR-driven SEO.

Experience

Work history, roles, and key accomplishments

Current

Frontend Developer

Current

Sterling Bank

Mar 2024 - Present (2 years 4 months)

Architected a cross-platform cart synchronization system using server-driven cart state with optimistic UI updates and rollback on failure. Built an analytics and reporting dashboard using Recharts and standardized TanStack Query server-state management, and implemented Paystack-based payment flows with mutation-driven verification.

React Redux Tanstack Query Optimistic UI Recharts SEO Next.js Paystack API Integration Google Analytics

Smart Contract Developer

Witty Engineering

Feb 2024 - Dec 2024 (10 months)

Designed and deployed 15+ Solidity smart contracts on BSC for a decentralized arbitrage trading platform, including multi-DEX swap logic and PancakeSwap price feed integrations. Secured contracts with OpenZeppelin protections and gas-optimized contract architecture, and implemented CI/CD vulnerability scanning with Slither along with Azure AD SSO and OAuth-based authentication.

Solidity Binance Smart Chain (BSC)Hardhat Upgradeable Proxy Pattern PancakeSwap Multi DEX Swaps Slither CI CD Azure Active Directory OAuth 2.0 JWT Cookie Based Sessions SSO

Frontend Developer

Nimbus Media Limited

Jan 2023 - Feb 2024 (1 year 1 month)

Refactored and upgraded the primary platform to Next.js 13 by implementing code splitting, lazy loading, and Cloudinary-based media optimization. Migrated production deployments from DigitalOcean and AWS to cPanel hosting and automated build/deploy workflows with GitHub Actions.

Next.js Lazy Loading Cloudinary GitHub Actions CI CD

Frontend Developer

Pade

Mar 2023 - Jul 2023 (4 months)

Refactored 65%+ of the frontend by migrating data fetching from native fetch to TanStack Query and replacing custom UI with Ant Design components. Implemented TanStack Query query key architecture with cache strategies and used Zustand for client-side persistence to improve performance.

Tanstack Query React Ant Design Query Key Architecture Caching Strategies Zustand

Frontend Developer & Team Lead

HNG Internship

Sep 2022 - Dec 2022 (3 months)

Led a cross-functional team of 15 developers, designers, and PMs to build and ship a SaaS web application, driving a mid-project migration from React to Next.js to leverage SSR for improved SEO. Served as team lead by running a mentorship program with weekly workshops and code reviews, and maintained code quality through PR reviews and reusable component patterns.

Next.js React Migration SEO Mentorship Code Review App Router