David L.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I add production AI to existing software products — voice agents, RAG over your real data, and LLM workflows — for B2B SaaS companies that need it shipped, not demoed. Recent result: senior developer on the core team of an AI voice agent platform that automated 70% of inbound calls for a US hospitality company — real-time call handling, RAG for context retrieval, STT/TTS voice flows, and PMS/POS integrations. In production, handling live calls daily. WHO I WORK WITH CTOs, engineering and product leaders at established software companies who already have customers and a codebase, and now need AI inside the product without breaking what works. WHAT I BUILD → Voice AI agents: inbound/outbound call automation, VAPI, real-time STT/TTS, PMS/POS/CRM integrations → RAG pipelines that retrieve the right context: chunking, embeddings, vector databases, evaluation → LLM features and agents inside existing apps: OpenAI, Anthropic, LangChain, tool-calling workflows → Workflow automation replacing manual ops, e.g. an AI WhatsApp assistant that handles tenant requests and routing for building management [add metric] HOW WE START 1. Paid technical audit (fixed price, 1–2 weeks): I review your product, data, and architecture and deliver a scoped AI integration plan with risks, costs, and a build path. 2. Build: fixed-price milestones, shipped into your codebase with tests, CI/CD, and docs. 3. Ongoing: fractional AI engineering on a monthly retainer. STACK Laravel / PHP 8, Python, Node.js / TypeScript · Vue, React · Docker, AWS, Ubuntu, CI/CD · OpenAI, Anthropic, LangChain, vector DBs, VAPI 17 years in production engineering. I own the work from architecture to deployment and communicate in plain English, async-first, on US hours. NETWORK INFRASTRUCTURE I'm also a MikroTik Network Architect who designs and operates ISP/WISP networks: routing, VPN/WireGuard, and multi-site setups. If your problem is network-side, I can help there too. Send me a short description of the product and the AI capability you need. I'll reply with whether it's a fit and what the first step would look like.