Full-Stack Application Developer — Multimodal AI Platform - Freelance

Location: Fully remote (Canada) Duration: Milestone-based freelance contract Overview A large organization working with extensive volumes of imagery, video, and audio is building a next-generation multimodal AI platform to help experts analyze and manage content at scale. The platform performs first-pass analysis using computer vision, speech-to-text, and language models, then presents findings to human experts for review, correction, and approval. This is a software architecture, integration, and application development effort that assembles best-in-class existing AI services into a robust production platform. The developer will build the two core applications: a review-and-validation workspace for expert operators and a powerful search experience across the archive. Key Responsibilities Build an operator workspace for reviewing imagery and video, AI-generated metadata/transcripts/summaries, and approving, rejecting, or editing AI recommendations with workflow status and confidence indicators Develop role-based admin views for configuration, users/permissions, and workflow/system-health monitoring Create a search interface across imagery, video, metadata, transcripts, and contextual information with retrieval of archived content Integrate cleanly with REST APIs and ensure the UI is fully accessible (WCAG 2.1 AA) Deliver data-dense, high-trust interfaces where operators can see AI suggestions, confidence levels, and source media to make fast decisions Required Qualifications 6+ years full-stack development with production ownership of complex, data-heavy web applications Demonstrated delivery of review/annotation/validation or other human-in-the-loop UIs with ability to name the product and role in it Strong modern JavaScript framework experience (React, Angular, or Vue) plus solid API/back-end integration Proven accessibility work meeting WCAG 2.1 AA standards Portfolio of comparable shipped applications Must be based in Canada and able to contract as an independent professional Preferred Qualifications Experience with in-browser media/video players and large-media rendering Search and faceted-filtering UI development Design-system experience Role-based access control implementation in the UI layer Experience delivering complex software systems for government or regulated industries Work Location & Requirements Fully remote position Must be based in Canada Independent contractor engagement (not employment) Selection process includes review of background and past work, followed by a short technical assessment/coding exercise

Develop a multimodal AI platform featuring an operator workspace for reviewing AI-generated metadata and a powerful search interface for archived media. Build role-based admin views and ensure all interfaces are data-dense, high-trust, and fully accessible.

Requires over 6 years of full-stack experience with a proven track record of delivering complex, data-heavy web applications and human-in-the-loop interfaces. Candidates must be based in Canada, be able to contract as independent professionals, and demonstrate proficiency in modern JavaScript frameworks and WCAG accessibility standards.

• AngularPreferred
• Vue.jsPreferred
• ReactPreferred
• JavaScriptPreferred

Identified from the job description. Confirm important requirements above.

• Full-Stack Development
• React
• Angular
• Vue
• REST API Integration
• WCAG 2.1 AA
• JavaScript
• Human-in-the-loop UI
• Role-Based Access Control
• Faceted-Filtering UI
• Media Rendering
• Software Architecture

• Software
• Technology
• Data & Analytics
• Engineering

Minimum experience

5+ years

Posting language

English

Working hours

40 hours per week

Seniority

Mid-Senior level