Full Stack Engineer

Open to full-time
Bio

Samuel Paintsil is a full-stack software engineer with several years of experience across web, mobile, and API development. He has worked with companies in logistics, advertising, e-commerce, and gaming. Samuel builds with React, Flutter, Node.js, and Google Cloud Functions, developing mobile applications, business APIs, and web platforms. He has integrated third-party systems such as Stripe for payments and Google Maps for geolocation, and applies clean architecture principles to keep codebases maintainable for collaborating teams. At Flip Delivery, a parcel logistics company, Samuel optimized the business API and streamlined the parcel creation process, increasing delivery requests by 10%, while also maintaining rider and customer mobile apps with real-time tracking. At FHL Energy Gems, he led development of an e-commerce web application with Stripe payment integration and interactive product browsing for a jewelry retailer. He holds a Bachelor's degree in Computer Science from Kwame Nkrumah University of Science and Technology and a Nanodegree in Full Stack Development from Udacity. Samuel is well suited for full-stack roles involving mobile app development, API integration, and end-to-end product delivery.

Expertise
Node.jsHTMLCSSReactFlutterNext.js
Video Intro
Assessments

General Project Assessment

Great on Find the Length of the Longest Substring Without Repeating Characters, Difficulty Easy · Great on Optimize Product Page Load Time, Difficulty Medium · Great on Sharing Authenticated User Data Across the App, Difficulty Medium

Experience

  1. Fullstack Developer

    CONTRACTABLE· Enterprise & SaaSJan 2025 — Apr 2026
    • Worked across the frontend and backend of a construction project-management web application.
    • Built and maintained features supporting operational workflows, project management, and commercial processes.
    • Implemented pricing, tender, and construction-related workflows with appropriate data validation and business rules.
    • Developed data-heavy forms, dashboard interfaces, calculations, and API-connected product features.
    • Contributed to maintainable, usable, and scalable product delivery across the complete feature lifecycle.
    ReactNodejsExpress

  2. Nextjs Developer

    Confinity· Social & Consumer AppsJan 2025 — Mar 2025
    • Built and maintained user-facing product features using Next.js.
    • Developed responsive and user-centered interfaces using reusable React components and modern frontend patterns.
    • Translated product requirements and designs into functional, production-ready web experiences.
    • Integrated frontend components with backend APIs and managed data-driven interface states.
    • Resolved interface defects and improved usability and consistency across different screen sizes.
    NextjsReactTypescriptHonojs

  3. Lead Flutter Developer

    Confinity· Social & Consumer AppsSep 2023 — May 2024
    • Led mobile application development for user-centered product experiences in a fast-moving product environment.
    • Translated product requirements and designs into responsive cross-platform mobile features.
    • Built reusable Flutter widgets and structured application features for maintainability and scalability.
    • Integrated mobile features with Firebase, backend services, and external APIs.
    • Guided technical implementation, investigated defects, and supported reliable feature delivery.
    DartFlutterFirebase

  4. Lead Flutter Developer

    Confinity· Social & Consumer AppsJun 2023 — Jul 2023
    • Led Flutter development during an initial short-term mobile product engagement.
    • Built reusable mobile interface components and core user-facing application features.
    • Integrated mobile features with Firebase, backend services, and application APIs.
    • Established maintainable application structures and resolved implementation defects during delivery.
    FlutterDartFirebase

  5. Frontend Developer

    Edromart Solutions· HealthTechMay 2024 — Jul 2024
    • Built the web user interface for the EMS platform.
    • Connected frontend workflows and components to the platform’s backend APIs.
    • Developed responsive, reusable interface components for the web application.
    • Implemented data handling, loading states, validation, and error states for API-connected features.
    • Supported testing and frontend integration work that helped prepare the application for its beta launch.
    TypescriptUmiReactjsNextjs

  6. Software Engineer

    Flip Delivery· Logistics & Supply ChainJan 2023 — Mar 2023
    • Maintained and optimized server-side logic and mobile applications for a logistics and parcel-delivery platform.
    • Maintained the business API and improved response performance using Google Cloud Functions.
    • Maintained Flutter source code for the customer and rider applications using clean architecture principles.
    • Led the integration of Google Maps geolocation, enabling customers to track parcels in real time.
    • Streamlined the parcel-request creation process, contributing to a 10% increase in delivery requests.
    FlutterFirebaseDartTypescriptExpressGoogle Maps APIGoogle Cloud Functions

  7. Software Engineer

    Flip Delivery· Logistics & Supply ChainNov 2021 — Nov 2022
    • Collaborated with a three-person team to build an end-to-end technology system for a parcel-delivery service.
    • Led the development and documentation of an API for business integrations, supporting easier onboarding for external businesses.
    • Implemented user interfaces for customer and rider mobile applications.
    • Developed real-time rider-tracking features that allowed customers to follow parcel deliveries.
    • Implemented chat and call functionality between riders and customers.
    • Developed destination-direction functionality for riders and trip-history features for customers.
    FlutterFirebaseGoogle Cloud FunctionsGoogle Maps APINodejsExpressTypescript

  8. Software Engineer

    Xminger Advertising· Media & EntertainmentAug 2022 — Mar 2023
    • Collaborated with a three-person team to revamp the company’s business-management software.
    • Implemented a Google Cloud Functions scheduler that monitored invoice lifecycles, marked billboards as available after invoice expiration, and notified relevant stakeholders.
    • Developed a feature that allowed marketers to generate and send detailed customer PDFs containing billboard images, specifications, and map coordinates.
    • Engineered an automated PAYE-calculation feature that reduced manual work for the accounting team.
    • Built an employee activity and status-tracking feature that gave managers improved workforce visibility.
    • Applied clean architecture principles to improve code maintainability, developer onboarding, and collaboration.
    FlutterFirebaseTypescriptGoogle Cloud Functions
Education

  1. Bachelor of Science, Computer Science

    Kwame Nkrumah University of Science and TechnologyKumasi, Ghana2018 — 2022

  2. Nanodegree, Fullstack Development

    UdacityRemote2022 — 2022
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