Software consulting services
Revenant Systems is a UK software consultancy delivering full-stack and mobile development, AI consultancy, data engineering, cloud infrastructure, legacy software rescue, and technical due diligence — senior, in-house work for startups, growing companies, and established SMEs, built on the founder's twenty years of engineering systems at production scale. Choose a service for its definition, stack, and what's included.
Which service do you need?
- Need a custom LLM feature designed, shipped, or hardened? AI Consultancy →
- Need something built — web, mobile, or both? Full-Stack Application Development →
- Need numbers you can trust, from tracking to dashboards? Data Engineering & Analytics →
- Need the platform fixed, codified, or cheaper? Cloud Infrastructure & DevOps →
- Need an independent view before you invest or build? Technical Due Diligence & Prototyping →
- Inherited a system nobody dares change? Legacy Software Rescue & Modernisation →
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 · AirflowCloud Infrastructure & DevOps
The platform your product runs on — Terraform-managed infrastructure across AWS, Azure, and Google Cloud, Kubernetes and GitOps delivery where they earn their place, observability, and cloud cost control.
Terraform · Terragrunt · AWS · Azure · Google Cloud · Kubernetes · Helm · ArgoCD · GrafanaTechnical Due Diligence & Prototyping
Independent assessment of existing systems and rapid proofs of concept for new ones — from validating enterprise architecture to de-risking a startup's first build.
Legacy Software Rescue & Modernisation
Inherited or ailing production systems made safe to run and safe to change — including the Visual Basic 6, VBA, and .NET estates that quietly run so much of a business. Assessment, then stabilisation, then incremental modernisation.
Visual Basic 6 · VBA · .NET · Delphi · FoxPro · PHP · SQL Server · AWSSome engagements run as packages — audits and assessments with a fixed scope and a fixed price, agreed up front.
Not sure which service fits? Let's talk.
Get in touchYour message is read by the engineer who would scope the work; the reply is a short technical conversation.