A growing technology company, Cambridge, UK.
G5 Media builds products where AI, search and financial markets meet, and provides AI and search consultancy to businesses that need a technical lead without hiring one. Founded in 2018.
What G5 does
Products
Software for people who make decisions from data: traders, marketers, search teams. G5 designs, builds, runs and owns them. GammaDeck is the current one.
Consultancy
AI, search and marketing technology leadership for companies, one or two days a month, delivered personally by the founder under a written engagement letter.
Products
- GammaDeck register-interest stage Options dealers are forced to hedge at specific prices, and those prices act like walls that an ordinary chart doesn't show. GammaDeck reads the dealer book from live OPRA options data and shows traders the levels, the regime and what to expect before the open: call walls, put walls, the gamma flip, and whether dealers are absorbing moves or amplifying them. It replaces the forty-five minutes of morning prep across three tools and a spreadsheet with one screen. gammadeck.ai GammaDeck provides market data and analytics for information and education. It is not investment advice and makes no promise about trading results.
- TopicalRelevance.com built 2018, sold 2023 An NLP tool for SEO that showed which terms made a page relevant to a search, years before every marketer had an API key. Grown to over 4,000 registered users and sold to an overseas agency in May 2023. It is the proof that G5 can take a product from idea to exit.
- In development Two further products are being built on the same engine. They are named when they ship, not before.
Work for clients
Since 2020 G5's main engagement has been with GeekyTech, a B2B SEO agency for technology companies, where the founder serves as Chief Innovation Officer. What G5 has built there, all owned and run by GeekyTech:
- GeekyIQ live product, owned by GeekyTech An AI visibility platform. Brands have no idea what ChatGPT, Claude, Gemini and Perplexity say about them; GeekyIQ asks the models, scores the answers for visibility, accuracy and citation strength against ground truth, benchmarks against competitors, and turns the gaps into a prioritised fix list. It grew out of the agency's audit engine and runs on the same architecture. geekyiq.com
- The agency's AI toolkit The systems that make a B2B SEO agency scale: a content intelligence engine that crawls a whole client site, extracts every entity, maps topical coverage and finds the gaps; an AI content pipeline that writes briefs with entity targets and competitive gap analysis, then pages at scale against them; a schema markup generator from the same entity layer; a multi-tenant retrieval chatbot with gap-aware retrieval that says when it doesn't know; and an MCP server that puts live client SEO data in front of Claude and other AI agents.
Client work is delivered under a written engagement letter. Clients own what is built for them; G5 keeps its general methods and tooling, and nothing built for one client contains another's code or data.
How G5 builds
Nearly everything the company has shipped shares one architecture. Take in messy, unstructured content: web pages, AI model answers, options chains, financial filings, company records. Pull out the entities. Work out which ones are the same thing across sources by meaning rather than by matching strings. Build the graph. Find what's missing or wrong. Put the answer in front of the person who has to act on it.
- Ingest
- Extract
- Resolve
- Graph
- Find gaps
- Act
The input changes from product to product; the architecture doesn't. That is why a search tool, an AI visibility product and a trading tool can come out of a company this size: each one is the same engine pointed at a different source. Python, FastAPI and PydanticAI on the back end; React and TypeScript on the front; PostgreSQL underneath; the AI models as components, costed per call and never trusted without a check.
How G5 works
- Build what we'd use. Every product started as a tool the founder needed and couldn't buy.
- Data, not advice. G5's products show what is happening. What to do about it is the user's call, and the products say so.
- Name only what's live. If it isn't on this page you can't try it yet.
- Own the stack. No white-labelled products, no outsourced builds. The company owns the code it ships.
- Say "I don't know". Systems that admit the edge of their knowledge are worth more than systems that sound sure. G5 builds the first kind.
- Small on purpose. Revenue funds the next product, not a headcount.
Story
- 2018
- G5 Media Ltd incorporated. TopicalRelevance.com built and launched.
- 2020
- The founder joins GeekyTech, a B2B SEO agency, as Chief Innovation Officer, contracting through G5. The agency's AI toolkit and then GeekyIQ are built over the following years (see Work for clients).
- 2023
- TopicalRelevance sold.
- 2026
- GammaDeck opens for registrations of interest. The consultancy offer is opened to companies beyond the GeekyTech engagement.
Founder
Jo Priest, founder and director. Fifteen-odd years in search and marketing technology; CIO at GeekyTech since 2020. Writing and background at jopriest.com; profile on LinkedIn.
Working with G5
Every engagement is set out in a written engagement letter before it starts: scope, days, fee, notice period and who owns what. Clients own the deliverables; G5 keeps its general methods and tooling. Nothing built for one client contains another's code or data. The company is VAT registered, carries professional indemnity insurance, and invoices monthly in advance for retained work. Registered details are on the company page.