mat@matsiems.com · matsiems.com/contract · linkedin.com/in/matsiems · github.com/matsiems London, UK · London hybrid / UK remote · Open to outside-IR35 engagements where the working practices support it
Contract Lead AI Engineer with 15+ years delivering production software, the last four focused on agentic systems. Built and operates three live agentic platforms (AIOS · AIBO · ABC), a 115-role multi-agent workspace, and a 23-site AI-native fleet. Enterprise delivery includes Allianz, RWS, Sainsbury's, Brittany Ferries, BBC, and MasterCard. Open to 3–6 month senior or lead engagements that take an AI use case through architecture, implementation, governance, deployment, and handover.
| Metric | Today |
|---|---|
| Agentic platforms live | 3 (AIOS · AIBO · ABC) |
| Multi-agent roles defined | 115+ (AIOS workspace) |
| AI-native sites in production | 23 (MS26 fleet) |
| Auto-indexed vault notes | 2,094 (cross-codebase second brain) |
| AI media shipped | 1,000+ videos · 10,000+ images |
| Years delivering production software | 15+ |
Role: Lead AI Engineer · Stack: Next.js 15 · React 19 · TypeScript · Supabase · Vercel · Claude API + OpenRouter fallback · MCP
A 115-role multi-agent workspace with a hardened Claude API proxy, multi-workspace tenancy, 24 integrations (Gmail, Slack, Drive, Sheets, Linear, Xero, Notion, Stripe, …), end-to-end Vitest coverage, and a recoverable provider fallback chain verified during a live incident. Ship cadence: weekly versioned phases (v10.65 and counting).
Role: Founding Engineer · Stack: Next.js · MongoDB FLEET shape · S3 · Multi-agent persona pipeline
A multi-agent backoffice that designs, generates, and operates the asset library for an entire 23-site fleet — personas, page heroes, hero videos, product imagery, daily digests. Each persona is an autonomous agent with its own prompt, model, tools, and output schema. Replaced 6+ manual roles with a single ops console.
Role: Solo Builder · Stack: Next.js 16 · Tailwind v4 · shadcn · Supabase · Mongo · S3 · 60+ Claude Code skills
A 28-route command centre orchestrating the entire MS26 ecosystem from one keyboard — Apps + Backoffice + Context. Every operational verb (build, deploy, push, analyse, generate, ingest, sync) is a Claude Code skill. The cockpit became the operating system for the whole 2026 personal-fleet target — one human, 23 sites, three platforms, all shipped solo.
Agentic stack (lead with this): Claude Code · Anthropic Managed Agents · Model Context Protocol (MCP) — own + third-party servers · Subagents · Skills · Hooks · Plugins · Tool-use design · Function calling · A2A (agent-to-agent) protocols · Multi-agent orchestration · Agent memory + state · Recoverable fallback chains · Versioned phase shipping
Models & frontier work: Claude (Opus 4.7, Sonnet 4.6, Haiku 4.5) · GPT-5 · Gemini 3 · Llama 3 · DeepSeek · Mistral · OpenRouter routing · Runware · Stability Matrix · Fooocus · Whisper · Coqui
Retrieval & knowledge: RAG · GraphRAG · embeddings · vector DBs · hybrid search · chunking · LlamaIndex · vault-style auto-indexing · entity linking · backlinks
Multimodal generation: image (SDXL, Flux, nano-banana, Midjourney) · video (Seedance, WAN, Sora, Runway, Pika) · audio (TTS Coqui, STT Whisper) · Remotion composition · end-to-end pipelines
Backend & infra: Python · FastAPI · Node 22 · Bash · MongoDB Atlas (FLEET shape across 100+ apps) · Supabase Postgres + RLS · AWS (EC2, S3, Route53, IAM) · Vercel · Docker · GitHub Actions · NGINX
Frontend: Next.js 16 (App Router) · React 19 · TypeScript · Tailwind v4 · shadcn/ui · lucide · Radix · Recharts · Storybook
Workflow: Scrum · Lean · MVP delivery · backlog grooming · sprints · user stories · phase captains · weekly version cuts
Cleverfox AI — Lead AI Engineer & Consultant · 2025–present Founded the Cleverfox AI engineering practice. Designed and shipped AIOS, AIBO, and the MS26 platform. Built the agentic-AI delivery playbook: Claude Code skills as the unit of operational work, MCP for tool reach, versioned phase shipping with vitest contract tests and recoverable model fallbacks. Mentor + reviewer for the wider team.
Allianz — AI Consultant / Technical PM · 2024–2025 Delivered Copilot Studio assistants, voice agents, and AI-driven contact-centre automation. Brought product-level rigour to a regulated enterprise AI rollout (GDPR, internal audit, redaction).
RWS — Technical PM & AI Consultant · 2023 Integrated AI translation workflows into existing language-services platform; led agile delivery across cross-region engineering teams.
Sainsbury's — Technical Delivery Manager · 2022 Delivered a CI/CD data pipeline (Snowflake + Jenkins + Airflow) powering marketing analytics for one of the UK's largest retailers.
Open Play — Technical Consultant · 2021 Delivered an integrated e-commerce + leisure-management platform: membership, payments, ticketing, search.
Brittany Ferries — Digital Transformation Consultant · 2018–2020 Delivered the booking platform refresh — AI-ready content models, faceted search, payments architecture.
Earlier: Dun & Bradstreet · Account Technologies · M-Kopa · NBC Universal · Citizens Advice · BBC · AOL · DoubleClick (Google) · Expedia · MasterCard · Aviva · Publicis · CHI & Partners · Skura · Cogniflare.
Contract Lead AI Engineer. A 3–6 month outcome-led engagement spanning architecture, hands-on implementation, enterprise integration, governance, deployment, and knowledge transfer.
Delivery sprint. A fixed-scope 2–4 week production slice for a team that knows the use case and needs senior engineering to get it through the real stack.
Advisory. Architecture review, Claude Code adoption, workflow design, or a focused working session before a larger commitment.
Start: matsiems.com/contract · email mat@matsiems.com
AI-native consumer: fs-sooty.vercel.app (Funky Success — non-fiction discovery) · xmas-matsiems.vercel.app · lituk-opal.vercel.app · sp-eta-eight.vercel.app Tools: scroller-psi.vercel.app · cad-steel.vercel.app (course-a-day) Reference & wikis: wikai.vercel.app · wbp-matsiems.vercel.app Agentic platforms (private demos on request): AIOS · AIBO · ABC
The current agentic work sits on top of a long enterprise-delivery foundation. I can move between stakeholders, architecture, backlog, code, review, governance, and handover without losing the production outcome. The portfolio shows the agentic systems; Allianz, RWS, Sainsbury's, Brittany Ferries, BBC, and MasterCard show the delivery context.
A 3–6 month senior or lead contract designing and shipping agentic systems, LLM applications, MCP-native integrations, enterprise AI workflows, or AI-enabled engineering delivery. London hybrid or UK remote. Open to outside-IR35 engagements where the working practices support the determination.
Talk to me about: Anthropic Managed Agents · MCP server design · Claude Code in production · multi-tenant AI platforms · ops-as-skills · the 1-human-23-sites blueprint.
Last updated 2026-07-29 · Contract profile: matsiems.com/contract · Long version: matsiems.com/cv · PDF: matsiems.com/cv/mat-siems-cv-2026.pdf