Valentine Efagene

Senior Software Engineer

Valentine Efagene

Senior Software Engineer specializing in scalable backend systems, APIs, and cloud infrastructure. 5+ years of experience with TypeScript, AWS, system architecture, and building reliable production software.

ExperienceCertifications

Career

Experience

  1. Software Engineer

    Turing · USA

    • Implement full-stack TypeScript features and evaluations that improve quality and reliability of AI product outputs.
    • Ship production-ready solutions quickly, with a strong focus on correctness, edge cases, and maintainable design.
    • Collaborate across distributed teams to unblock delivery and iterate based on feedback.

    March 2025 — Present

  2. Senior Full Stack Developer

    QShelter · Nigeria

    • Built web admin experiences and backend APIs for QShelter and federal housing initiatives (MREIF, Renewed Hope), improving operational execution across mortgage and property workflows.
    • Designed role-based product flows with a granular RBAC authorization system for page and component access, reducing inter-departmental access conflicts by 80%.
    • Built and maintained microservice-based APIs serving 112,000+ users, with a focus on reliability, clear API contracts, and scalable architecture.
    • Implemented dashboard analytics used by sales and operations teams to monitor KPIs, contributing to performance improvements of over 70%.
    • Delivered automated tests and technical documentation (OpenAPI/Swagger, Postman flows, ERDs, sequence diagrams) to speed handoffs and reduce release risk.
    • Deployed cloud infrastructure with AWS CDK and supported iterative delivery of product and process improvements.

    November 2023 — Present

  3. Full Stack Developer

    Jatado · Nigeria

    • Revamped the Jatado blog with engagement-focused features (sharing, likes, comments, saved libraries) to improve user interaction and retention.
    • Built frontend and backend modules for a contact management system in a multi-module operations platform.
    • Developed APIs for a diet application and maintained tests plus technical artifacts (ERDs, sequence diagrams, API docs).

    June 2022 — October 2023

  4. Front End Developer

    WIDOX · Remote

    • Built the front end for a crypto website.
    • Wrote both component and end-to-end tests.

    February 2022 — April 2022

  5. Full Stack Developer

    Freelance · Remote

    • Built customer-facing websites and product flows for multiple businesses, including Java Energies.
    • Delivered an account-opening application for Homebase Bank and integrated queue-based processing to improve user experience under load.
    • Built the frontend for Traffic Pilot, a CMS for social traffic monetization and ad delivery workflows.
    • Developed and launched the GDS Micro Credit Platform with a React frontend, backend services, scalable data models, and automated accounting processes.

    February 2019 — Present