Vitalik – React, Next.js, Typescript

A B2B SaaS platform designed for digital creator agencies to fully automate customer relationships, audience engagement, and digital media monetization. Operating 24/7 in the background, it integrates advanced behavioral artificial intelligence to organically interact with fans, securely handle digital sales workflows, and optimize operational costs by shifting personnel from manual data entry to exception-only oversight dashboards.

• Architected a serverless B2B platform with a webhook → Queue → Durable Object → OpenRouter agentic pipeline automating fan DMs and PPV content sales - shifting agencies from full-time chatters to exception-only escalation, directly reducing per-creator labour cost.
• Built RAG-powered vault content recommendations (Cloudflare Vectorize + OpenRouter embeddings) with 24-hour purchase attribution, exposing AI-generated PPV revenue, LLM cost per conversation, fan satisfaction rate, and escalation breakdown to agency operators.
• Delivered the companion admin SPA as sole frontend engineer: multi-profile AI config, subscription automation, vault media management, and ops dashboards surfacing AI-vs-human volume and attributed revenue - deployed as an edge SPA on Cloudflare Workers.

A multi-purpose digital entertainment ecosystem that delivers high-performance conversational AI chat alongside automated multimedia generation.

• Sole backend engineer on the production Chat API: owned token-budgeted session history, freemium-to-paid conversion gating, and led API migration from version 1 to version 2 with zero client-breaking changes.
• Shipped an embeddable AI media generation widget integrated into an existing consumer platform: async job polling with queue-position UX, gems-based monetization (3 per image, 50 per video), parent-site auth passthrough, and automated Cloudflare R2 bundle deployment - enabling in-platform revenue without a full platform redeploy.

High-traffic search and discovery engine for creator profiles, enabling fans to find and explore content creators across platforms.

• Sole full-stack engineer for a year, owning the entire product from search infrastructure to UI across a high-traffic platform indexing 1M+ creator profiles.
• Migrated search backend from Elasticsearch to MongoDB Atlas Search, reducing infrastructure costs while maintaining search quality and performance.
• Led UI redesign, implemented XML sitemaps for SEO, and built content moderation tooling to support platform growth and safety.

Consumer mobile app for small communities, enabling group creation, realtime communication, and event coordination.

• Implemented phone OTP onboarding flow using Twilio SMS, enabling secure user authentication without password management.
• Built group creation and membership system allowing users to form and manage small communities.
• Shipped realtime chat and event coordination features using Firebase Realtime DB and Cloud Functions.
• Designed domain-oriented custom hooks abstracting Firebase interactions, improving code maintainability and testability.

Management and versioning tool for AI researchers in healthcare, featuring a DICOM-compatible image library and a robust user management system. It facilitates the efficient handling of AI training data and collaborative research.

• Built the web application using Next.js and Mantine, translating UI/UX design into functional components and pages.
• Developed and integrated API endpoints and business logic with Nest.js to support application features.
• Implemented a filtering system for the Data Library utilizing Zod validation.