Professional certification bodies, medical/legal board prep companies, and K-12/higher-ed testing providers frequently search to hire a freelance online assessment platform, Computerized Adaptive Testing (CAT / IRT), IMS QTI & AI item-generation programmer. I am Aldian Fazrihady, a Senior Freelance Full Stack Developer and AI Application Engineer.
Core High-Stakes Exam & Adaptive Assessment Capabilities
- Fault-Tolerant Exam Delivery Engine: Saving candidate item responses and remaining countdown timer state atomically on every keystroke/selection to IndexedDB and Redis/PostgreSQL—so browser crashes or Wi-Fi drops never lose a candidate's exam attempt.
- Item Response Theory (IRT 1PL/2PL/3PL) & Adaptive Testing: Selecting the next optimal question dynamically based on real-time maximum-likelihood ability estimation (`theta`).
- AI Item Bank Generation & Distractor Rationale Authoring: Assisting subject-matter experts in generating syllabus-aligned multiple-choice, vignette, and rubric-graded free-response items with psychometric difficulty calibration.
Frequently Asked Questions
How do you prevent exam timer manipulation on the client browser?
The authoritative exam deadline is calculated and enforced on the backend server (`started_at + duration_seconds + accommodation_extension`); the client timer is purely a synchronized visual countdown.
How do I hire you to build or scale our online assessment platform?
Hire me via Upwork.