Alexander Rengkat

Full-stack developer with 5+ years delivering production-grade web applications across NGO, media, education, and enterprise sectors. Built and containerised systems serving 300+ daily users with 99.5% uptime; led legacy-to-Next.js migrations that halved feature-delivery time. Extensive hands-on experience building accessible, WCAG 2.1 AA-compliant and screen-reader-first products, including an assistive-technology CBT platform and learning tools used daily by blind students.

Strong communicator with a track record of mentoring junior developers and teaching software development to non-traditional learners.

Full-Stack Web Developer & Coding Instructor at Bethesda Home and School for the Blind (2026-02 – Present)

• Developed and deployed a full-stack Computer-Based Test (CBT) application accessible to both blind students and administrators, with CSV-based exam creation and management, built as a Progressive Web App with IndexedDB offline storage to keep exams running through power and internet outages.
• Built a screen-reader-driven typing tutor where audio cues guide students through structured exercises, helping blind students build touch-typing and keyboard fluency without visual input.
• Created an accessible Word Connect puzzle game for the primary school section, reinforcing vocabulary and spelling through an audio-guided, gamified interface.
• Teach coding fundamentals to blind students, adapting curriculum, tooling, and code-editor workflows for full screen-reader compatibility.
• Currently building Gavitest.ng, a SaaS exam-prep platform for students across Nigeria, integrating AI-driven performance analysis to deliver personalised feedback at scale.

Software Developer (Contract) at Orphanage Care & Help Vulnerable Children Aid Foundation (2024-06 – 2026-06)

• Cut API response times by ~40% across two organisational web platforms by refactoring Node.js/Express services and introducing MongoDB indexing and query optimisation.
• Shipped AdsJobBoard, a bespoke CMS, reducing content publishing turnaround from ~2 days to under 2 hours and eliminating reliance on a third-party platform.
• Improved Core Web Vitals (LCP < 2.5s) across two NGO platforms by implementing code-splitting, lazy loading, and Redux selector memoisation in Next.js.
• Mentored 3 junior developers through bi-weekly code reviews, cutting average PR review cycles from 4 days to under 1 day and standardising TypeScript conventions team-wide.

Full-Stack Developer (Contract) at NOSA (2023-03 – 2024-06)

• Architected and maintained a production Next.js/Node.js platform used by ~200 internal users, achieving 99.5% uptime over 12 months through proactive monitoring and staged deployments.
• Designed and secured 12+ RESTful API endpoints for analytics and data management, reducing data-fetch errors by ~60% through input validation, rate limiting, and structured error handling.
• Containerised 4 services with Docker and configured CI/CD pipelines, slashing environment setup time from ~3 hours to 8 minutes and eliminating cross-environment deployment failures.
• Led a legacy-to-Next.js migration with 3 designers and 2 stakeholders, reducing codebase size by ~35% and cutting new-feature delivery time in half through reusable component architecture.
• Delivered WCAG 2.1 AA-compliant interfaces with Tailwind CSS and React, achieving a Lighthouse accessibility score of 94+ across all dashboard views.

Front-End Developer at Yoris Africa Enterprise (2021-05 – 2023-03)

• Reduced super-admin dashboard render latency by ~45% by introducing Redux Toolkit with memoised selectors and eliminating redundant re-renders across 15+ UI components.
• Built a shared library of 30+ reusable React components with WCAG 2.1 compliance, cutting UI development time for new features by ~50% and reducing designer-dev handoff friction.
• Enabled sub-second real-time data delivery for 300+ end users by migrating data-fetching from REST polling to WebSocket streams, reducing stale-data incidents by ~75%.
• Refactored a 25,000-line legacy frontend codebase to TypeScript and React hooks, reducing bug report volume by ~30% in the quarter following release.

Front-End Developer (Internship) at Headline News (2020-02 – 2021-04)

• Built and maintained 20+ Next.js components integrated with Sanity CMS and WordPress, supporting a news platform serving ~50,000 monthly readers. Refactored 8 legacy UI modules, cutting new-feature setup time by ~40%.

MSc in Chemistry – University of Nigeria Nsukka

BSc in Chemistry – University of Jos