Karan Mahajan

findabl is a full-stack SaaS platform I designed and built single-handedly to help businesses improve their visibility across AI-powered search tools like ChatGPT, Gemini, Perplexity, and Microsoft Copilot. I shipped the entire customer-facing product solo in [N weeks] — Next.js 16 App Router, React 19, TypeScript, Tailwind CSS 4, Supabase, Stripe, and SendGrid — covering the full journey from marketing and authentication through billing, onboarding, and a post-subscription dashboard. Visitors register with server-side reCAPTCHA v3, choose a Starter or Growth plan, acknowledge a dynamically generated PDF service agreement, and check out through Stripe, with webhooks keeping Supabase in sync and firing automated welcome emails and activity logs. On the technical side I built dual AI-powered business search on GPT-4o-mini and Gemini 2.5 Flash with IP-based rate limiting, promotional flows with auto-applied Stripe coupons matched by email, and marketing pages cached with Next.js's "use cache" directive on week-long TTLs and Suspense skeletons for fast loads.

I built and maintained a large-scale, multi-brand enterprise web platform serving two major Ontario utilities — Alectra Utilities and Guelph Hydro — powering their public sites, customer portals, and a shared UI component library consumed by third-party billing and account-management apps. The hardest part was integration: I engineered custom Drupal modules exposing dynamic header/footer and billing endpoints that external JSP applications rendered live, so two separately-built systems looked and behaved like one product. I stood up full-text search on Apache Solr with advanced filtering and spellcheck, and delivered a responsive, multi-brand front-end on a custom Foundation theme with multi-region layouts, inline alerts, and accessible navigation. The platform runs on Pantheon with enterprise caching and is hardened to utility-sector security standards (CSP, 2FA, and bot/spam protection) for reliability at scale.

I built a native macOS writing assistant that lives in the system tray and drafts replies in my own voice across Teams, Outlook, JIRA, Confluence, GitHub, and ChatGPT. The hard problem was reading on-screen context without browser scraping or extensions — I solved it with Swift accessibility helpers calling the macOS Accessibility API directly, then stream replies from the Claude API tuned to a personal style guide and memory file. Three triggers cover every surface: a selection popover for grammar and rewrites, a proactive compose bubble above multi-line inputs, and a global overlay window. To preserve rich email formatting I write Outlook replies via synthesized CGEventPost keystrokes instead of flattening the content, and the API key never leaves the OS keychain. Built with Electron, Node.js, and Swift.

I designed and built a custom WordPress theme for Interstone, a premium building-materials company, turning a 1500+product catalogue into a polished, fully responsive browsing experience with no transactional layer. The interesting constraint was using WooCommerce purely as a catalogue engine — I stripped all cart and checkout UI so users could explore products by category and filter by material, colour, and finish, with live search returning instant results as they type. The standout feature is an AI-powered Visual Search page where users upload a photo of their space and get relevant product recommendations back. Under the hood I built a strict SCSS token system on Bootstrap 5 with a Gulp pipeline (compilation, autoprefixing, minification, source maps) and seven reusable Gutenberg blocks on ACF Pro, so the client can compose pages without touching code.