Full-stack development of B2B SaaS and marketplace products for international clients, as sole or lead developer, in an AI-native, spec-driven workflow.

Contrify — B2B contract management SaaS for a client in Germany (sole developer):

- Built the platform end to end in ~6 months: requirements, architecture, UI, frontend and backend (Next.js, TypeScript, Supabase/PostgreSQL)

- Implemented LLM-based contract parsing with OpenAI and Anthropic models via OpenRouter, with provider comparison logic: extracts 20+ key fields per contract and cuts manual review from ~30 min to under 5 min per document

- Integrated DocuSign e-signing, Stripe payments and Sentry monitoring; built analytics dashboards, an admin panel and a vendor outreach module

- Led a phased refactoring: decomposed services and split dashboard components of 1,000+ lines into focused modules, shrinking the largest files by ~70%

Park-It — parking booking marketplace for a client in Bulgaria (lead developer), parkit-bg.com:

- Led full-stack development from requirements to release in ~4 months: API design, UI, Next.js + Express + MongoDB

- Implemented booking calculation logic (pricing, duration, availability) and search with 8+ filter criteria

- Built interactive maps and geolocation search of nearby spots with MapTiler; integrated Stripe and Revolut payments

- Covered booking and payment flows with 150+ unit, integration and E2E tests (Jest, Playwright)

Across projects:

- AI-native, spec-driven workflow: spec > implementation with Claude Code agents (Superpowers, custom MCP servers) > automated verification (Jest, Playwright), letting a single developer ship two products to production

- Worked directly with clients: turned requests into specs and tasks; sprint planning and code reviews in ClickUp

Stack: Next.js, React, TypeScript, Node.js, Express, PostgreSQL, Supabase, MongoDB, OpenAI / Anthropic APIs, OpenRouter, DocuSign, Stripe, Revolut, MapTiler, Sentry, Jest, Playwright

AI-powered platform for video creation and editing. International cross-functional team of ~15 people (QA, design, frontend, backend, PM, delivery) across time zones.

- Shipped 20+ features of the React/Next.js frontend for the video editor, built to scale for projected user growth

- Built state management with Redux Toolkit and MobX for real-time video preview and editing, cutting unnecessary re-renders by ~40%

- Integrated the frontend with backend APIs, aligning on API contracts with the backend team

- Used AI-assisted development (Cursor, MCP) daily to speed up delivery and refactoring

- Collaborated in English across time zones: daily stand-ups, sprint planning, demos and code reviews

Stack: React, Next.js, TypeScript, Redux Toolkit, MobX, Tailwind CSS, Cursor

AdTech platforms for advertising and marketing campaigns.

- Built an AI-powered landing page generation pipeline (HTML/CSS templates, content generation, configuration), cutting page creation from ~1 day to under 1 hour

- Refactored legacy React components following SRP, reaching 95+ Google PageSpeed scores

- Built 30+ lightweight, high-performance landing pages with Preact and plain HTML/CSS

- Built and maintained REST APIs and backend logic for advertising products

- Delivered end-to-end features with React, Next.js and Preact on the frontend; NestJS, Go and PHP/Laravel on the backend

- Used Cursor for AI-assisted development and refactoring

Stack: React, Next.js, Preact, TypeScript, NestJS, Go, PHP, Laravel, HTML/CSS, Tailwind CSS

Crypto product for automating Discord account management and tracking cryptocurrency transactions.

- Cut load time by ~45% through state management and bundle optimization

- Built the admin panel and analytics dashboards in React (tables, filters, charts, account management)

- Migrated a legacy JavaScript codebase to TypeScript

- Implemented WebSockets for real-time transaction tracking and Discord notifications

- Designed REST API contracts together with the Django backend team

- Worked in weekly sprints, joined retrospectives and client calls

Stack: React, TypeScript, Redux, SASS, WebSockets, Discord API