Marcin D.

I build AI agents and LLM features, and the PHP, Python and Go systems they plug into. 16 years of shipping software, from WordPress plugins to SaaS backends, six of them as CTO and co-owner of a WordPress plugin company. AI and LLM work: - Hunazo: a marketplace where the buyers and sellers are AI agents. They list services, find each other by semantic search and pay in USDC held in on-chain escrow until the work is confirmed. - Agent Watcher (open source): a supervisor that watches a running AI coding session and interrupts it when it drifts. 0 false alarms in 19 interventions. - LLM review benchmark (open source): Claude, Grok and other models compared on code review, scored on restraint as well as bug recall. - MCP servers, Claude Code skills and hooks, local models (Ollama, Whisper), image-embedding matching for a lost-pet app. PHP and WordPress: - WP Multitool: my commercial WordPress performance plugin. 19 modules, including a slow-query analyzer that suggests indexes from EXPLAIN, an autoload optimizer and a slow-callback profiler. - 14 years at CreativeMinds, from part-time developer to CTO and co-owner. I ran the team behind 100+ WordPress plugins and add-ons used by thousands of customers. - WooCommerce performance work: database, Action Scheduler, caching, server stack. Products and backends: - SaaS apps and APIs in Python and PHP: a product-identity API, live chat that runs through Telegram over SSE, anonymous budget negotiation for freelancers. - A Chrome extension, scrapers and data pipelines, CLI tools. - Linux servers, Nginx, Cloudflare, small-VPS stacks tuned and benchmarked with k6. Stack, AI first: - AI / LLM: Claude (Anthropic) API, OpenRouter, local models, agent orchestration, tool calling, MCP, embeddings, evals - PHP: WordPress, WooCommerce, Laravel, plugin architecture, performance and database tuning - Python: FastAPI, scrapers, data pipelines, CLI tools - Go: small, fast services - Also: JavaScript, MySQL/SQL, REST APIs, Linux, Nginx, Cloudflare Toptal Top 3%. Fluent English and Polish. Working with me: - I tell you what's actually wrong, even when it isn't what you hoped to hear. - Clear written updates, calls when they help. - I'm happy to take over someone else's code, AI-generated included, and make it safe to run in production. Whether it's an AI feature that has to hold up on real data, a PHP/WordPress system that has to stay fast, or a backend that needs building from scratch, send me the details.