Esther Owusu-Ansah

1. Built and maintained a crypto and NFT wallet browser extension using Zustand, React Query, and Ethers.js, serving 10,000+ users with seamless wallet and transaction capabilities. 2. Led a team of 3 to develop the MVP of a stake-based open-governance dApp on the IC blockchain using Next.js, enabling decentralized decision-making. 3. Customized Rainbow Wallet for Bitfinity EVM tokens and integrated cross-chain bridging for BTC, ICP, and ICRC tokens. 4. Set up a CI/CD pipeline with Firebase Hosting and GitHub Actions to automate deployments and streamline collaboration.

1. Led a team of 3 to deliver a Scala and Java-based trade reference data system, improving data consistency and reducing access latency for traders by 40%. 2. Collaborated with global teams to streamline data sourcing and consolidation in the Risk & P&L Calculations department, enhancing reporting accuracy and operational efficiency. 3. Increased system reliability through comprehensive test coverage (smoke/unit), reducing production bugs by 30%. 4. Authored technical documentation covering deployment, SDLC, and onboarding, cutting setup time for new devs by 50%. 5. Drove agile ceremonies, code reviews, and troubleshooting, unblocking team members and improving sprint throughput by 25%.

1. Contributed to a 4-member team that built a scalable, distributed trading system using Java Spring, ensuring high availability and efficient transaction processing for financial operations. 2. Improved system throughput and reduced latency by implementing Redis-based queuing and asynchronous batch request handling in a microservices architecture. 3. Provisioned and deployed a 4-node distributed system, setting up CI/CD pipelines via GitHub Actions, Heroku, CircleCI, and AWS to accelerate deployments and testing cycles. 4. Facilitated LeanIn Circles to foster inclusion and diversity; organized both physical and virtual community meetups. 5. Supported talent acquisition by interviewing and onboarding new developer cohorts, and provided hands-on tutoring during their training. 6. Taught a 6-week JavaScript and React Native course to university students, mentoring them through two real-world projects and strengthening their practical frontend/mobile dev skills.

1. Developed a secure, cross-platform healthcare app using React Native and Firebase in a team of 3, enabling real-time patient-provider data syncing and role-based access control. 2. Implemented advanced chat functionality (group/individual messaging, online/typing/read indicators, and push notifications), significantly improving user engagement and communication efficiency.

1. Built a scalable document upload service using Node.js, Express.js, GraphQL, and AWS S3, enabling secure file management via efficient API access. 2. Developed a secure QR code service using Flask and AWS Cognito, ensuring robust authentication and protected data access. 3. Led the migration and cleaning of Ghana district geospatial data using ArcGIS, improving delivery tracking accuracy; co-developed a GeoServer WMS for real-time spatial data visualization. 4. Co-developed a construction management frontend using React.js and Apollo GraphQL for real-time task tracking and project oversight. 5. Integrated Mapbox turn-by-turn navigation in a React Native app using native Android Java modules, enhancing real-time routing UX. 6. Contributed to a WordPress platform for the National Communication Authority (NCA), implementing SEO best practices and mailing features to boost visibility and engagement.

Skills: HTML5 · Computer Science

1. Built and maintained a reusable component library (30+ components) with React.js, Storybook, and Jest, reducing dev time by 25% and cutting UI-related bugs by 40% using Material UI design system. 2. Developed a blog platform with React and Draft.js, boosting SEO and improving content publishing through a user-friendly rich-text editor. 3. Created an emailing service with 5 custom HTML templates, reducing composition time by 30% and increasing engagement by 20% through timely, personalized communication. 4. Integrated Stripe payments for property rentals, supporting bank transfers, Apple Pay, and debit cards for secure, seamless transactions.

1. Built the backend of a Laravel + PostgreSQL web app for the Ghana Lands Commission, digitizing workflows across 6 departments and saving ~3 weeks of processing time. 2. Hosted and optimized a WMS using GeoServer and PostGIS for high-performance land parcel data retrieval and spatial search. 3. Developed the WASSCE Past Questions app, delivering curated study content, real-time grading, and performance tracking to support exam readiness across multiple subjects. 4. Built a mobile-responsive, SEO-optimized website for Adwenan, improving user accessibility, search visibility, and cross-device performance.

Skills: MySQL

Skills: REST APIs · MySQL