Founder-led UK engineering for
Business-critical software, data and AI
Revenant Systems works with startups, growing companies, and established SMEs whose software, data, infrastructure, or spreadsheets have become business-critical. Founder Ian Compton leads every engagement, drawing on twenty years of engineering experience, including prior roles running platforms that process billions of events a month. Quietly. Correctly. On time.
Ian reads your enquiry personally. The usual next step is a free 20–30 minute technical fit call.
Why teams call us
Something else? Let's talk →- “Our AI feature works in the demo but fails with real users.” AI Production-Readiness Audit →
- “We want an LLM feature in the product and don't know where to start.” AI Feature Feasibility Sprint →
- “Our AWS bill has grown faster than our traffic.” Cloud Cost Audit →
- “PostgreSQL is slow and nobody knows why.” PostgreSQL Performance Audit →
- “We don't know what we'd keep if our agency disappeared.” Technical Ownership Review →
- “We've inherited a system nobody understands.” Legacy Software Rescue →
- “The business runs on a spreadsheet we're scared to change.” Excel Workbook Audit →
- “We need a senior team to build the product properly.” Full-Stack Development →
Services
View all services →AI Consultancy
Practical AI integration — model selection, agent design, and custom LLM features built with the evaluation and guardrails that keep them dependable under production traffic. We also expose your existing applications to LLMs as tools agents can drive, automating workflows that used to take a person.
Anthropic · OpenAI · Google · OpenRouter · Python · pydantic-ai · LMStudio · llama.cppFull-Stack Application Development
Production web applications built end to end — data model, API, and interface. Go, Node.js and Python on the back end; Astro and HTMX for fast, lean front ends. Cross-platform mobile apps in React Native when you need to reach iOS and Android.
Go · Node.js · Python · Astro · HTMX · React Native · ExpoData Engineering & Analytics
The full data path — tracking and ingestion pipelines through to dashboards and reporting systems that turn raw events into decisions.
Python · PostgreSQL · ClickHouse · DuckDB · Data Warehousing · AirflowPackages
View all packages →AI Production-Readiness Audit
A fixed-price audit of an LLM feature or agent before — or after — it meets real users: evals, guardrails, prompt and tool design, cost, latency, and failure modes. From £5,500.
Cloud Cost Audit
A fixed-price audit of an AWS estate's spend — where the money goes, what each product costs, what's over-provisioned or idle, and who controls the account — delivered as a severity-ranked report and a prioritised savings roadmap. From £4,950.
Excel Workbook Audit
A fixed-price analysis of the Excel workbooks your business actually runs on — what they do, where they're fragile, and a clear route to fixing or replacing what the audit finds. From £3,950.
Selected work
All case studies →From an SQL reporting bottleneck to auditable answers in Slack
The team behind a UK membership business asks reporting questions in Slack; an agent answers against a read-only copy of the data, every figure traceable to the query behind it.
Have a project in mind? Let's talk.
Get in touchIan Compton reads your message personally. The usual next step is a free 20–30 minute technical fit call to check the problem, scope and likely budget.