AI & Machine Learning Ops/Enterprise AI Platform Architecture
Enterprise AI Platform Architecture
Executive Summary
Most organisations reach for a single hosted model, wire it into an application, and discover the limits soon afterwards: cost that scales with success, latency they cannot tune, data leaving the boundary, and a roadmap owned by somebody else. A platform architecture answers those problems differently — by treating models as one interchangeable component inside a system you control.
This reference architecture layers local quantised foundation models, fine-tuned adapters, retrieval grounding, agentic orchestration and continuous evaluation into a single operating platform that runs across cloud, hybrid and edge environments. The result is lower inference cost, lower latency, stronger data sovereignty, genuine vendor independence, and accuracy that can be measured rather than asserted.
Architecture Overview
Users & Applications
Web, mobile, back-office tooling and machine-to-machine callers.
API Gateway & Security Layer
Authentication, authorisation, rate limiting, quota enforcement and audit logging in one place.
AI Orchestration & Agent Layer
Planning, tool invocation, retrieval decisions, routing and human-in-the-loop checkpoints.
RAG Services
Vector, hybrid and graph retrieval over enterprise knowledge.
Fine-Tuned Models
LoRA and QLoRA adapters carrying domain-specific behaviour.
External Models
Commercial frontier models reached through the gateway.
Local Foundation Model Layer
The same model family served at several precisions, so each workload can be placed on the cheapest tier that still meets its quality bar.
- FP32
- FP16
- INT8
- INT4
- Distilled
Monitoring, Evaluation & MLOps
Traces, quality scores, drift signals and cost attribution across every layer above — the feedback loop that drives retraining.
Service Portfolio
Each of the following is delivered as a discrete engagement. Few clients need all of them at once, and the sequence matters more than the count.
Local Foundation Models
Enterprise models running inside your own boundary.
Open-weight families — Llama, Mistral, Gemma, Phi, DeepSeek, Qwen — deployed into infrastructure you control. That buys private deployment, materially lower per-token cost, the ability to operate offline, and a straightforward answer when a regulator asks where your data went.
Quantisation
Smaller weights, materially cheaper serving.
Reducing numeric precision shrinks a model's memory footprint and its GPU bill while holding accuracy inside an acceptable band. We benchmark the trade-off on your workload rather than assuming it: INT8 for production serving, INT4 where the target is an edge or embedded device.
Model Distillation
Teacher-to-student knowledge transfer.
A large teacher model supervises the training of a much smaller student, which then handles the narrow task at a fraction of the cost and latency. It works well for customer support, knowledge assistants, process automation and virtual agents — places where the job is bounded and the volume is high.
Fine-Tuning
Domain adaptation without retraining from scratch.
LoRA trains a small set of adapter weights over a frozen base model, keeping the training footprint and GPU spend down. QLoRA goes further, quantising the base model during training so large models can be adapted on modest hardware. Both are appropriate for domain adaptation, content generation and classification.
Retrieval-Augmented Generation
Grounding answers in your own content.
A query is embedded, matched against your indexed corpus, and the retrieved passages are folded into the prompt before the model answers. Sources include SharePoint, Confluence, ServiceNow, Salesforce, relational databases, PDF archives, internal APIs and public sites. The payoff is current information, fewer hallucinations, and a citation trail behind every answer.
Advanced Retrieval
When plain vector search is not enough.
Hybrid search combines semantic, keyword and metadata matching so exact identifiers are not lost to fuzzy similarity. Graph RAG adds knowledge graphs and entity relationships for questions that span records. Agentic RAG lets the system retrieve in several passes, reason over what it found, and synthesise across systems.
Context & Attention Optimisation
Long documents without runaway token bills.
Context compression cuts tokens, latency and cost before a request is ever sent. Attention tuning improves how reliably a model prioritises the relevant passage inside a long input. Together they make multi-document analysis, legal review and large-corpus discovery practical rather than merely possible.
Quality Assurance & Validation
Continuous scoring of what the system actually says.
Factual validation checks correctness and source grounding. Hallucination detection flags unsupported claims and fabricated references. Consistency testing measures whether the same question reliably produces the same answer. Reported as groundedness, answer relevance, faithfulness, precision, recall, task completion rate, latency and cost.
Agentic AI
Collaborating agents rather than one overloaded prompt.
Planner, research, validation and execution agents each hold their own tools and their own clean context, passing work between them. This underpins workflow automation, decision support and knowledge retrieval, with human approval gates wherever the blast radius warrants one.
Reliability & Resilience
No single provider is a single point of failure.
Requests route to a primary model with ordered fallbacks behind it, ending at a locally hosted model that stays available regardless of what any vendor's status page says. Azure OpenAI, OpenAI, Anthropic, Google Gemini and local models sit behind one interface, so provider choice remains a commercial decision.
MLOps & LLMOps
Lifecycle automation across data, models and deployment.
Data versioning, dataset governance and feature management underneath; experiment tracking, a model registry and version control in the middle; CI/CD pipelines with canary rollout on top. Drift detection, performance monitoring and cost tracking watch the whole thing in production.
Continuous Evaluation
Evidence for the decision to retrain.
Production prompts feed an evaluation dataset, which drives benchmark runs and quality scoring, which in turn informs whether a retrain is justified. Data drift, concept drift, prompt drift and knowledge drift are each monitored separately, because they have different causes and different remedies.
Security & Governance
The layer that makes AI defensible to a risk committee.
Role-based access control, encryption at rest and in transit, tenant isolation and audit logging as the baseline. On top of that, bias monitoring, explainability, compliance reporting and defined points of human oversight.
Tooling Is a Choice, Not the Architecture
Azure Machine Learning and Azure AI Foundry are tools within this architecture — good ones, and usually our first reach for a client who is Azure-native and unconstrained, because they remove a great deal of undifferentiated work.
Azure Machine Learning
Managed training compute, a model registry, repeatable pipelines and versioned endpoints. It covers a large part of the MLOps layer without anyone having to build and then own it.
Azure AI Foundry
A model catalogue, evaluation tooling and agent scaffolding in one place, sitting naturally alongside the orchestration and evaluation layers described above.
But both are one implementation of the layers in this architecture, not the layers themselves. Naming a product is not the same as having an architecture, and the distinction matters most precisely where the stakes are highest.
Regulated environments start from what you already run
In FDA-regulated, HIPAA-covered and comparable environments the picture is rarely a blank sheet. You already run Docker, Kubernetes and private cloud orchestration. You already hold a qualified platform, established change control, and an audit history you cannot casually discard for the convenience of a managed service. The requirement is not to replace that estate — it is to add AI capability on top of it without invalidating anything already validated. So we design to your existing orchestration and your existing controls, and treat every managed service as an option to be justified rather than a default.
Compliance from Day 0 to Day N
We bring Azure AI and Cloud DevOps architecture and implementation experience to that problem, with compliance treated as a Day 0 design input rather than a Day N remediation exercise. Retrofitting evidence onto a system that was not built to produce it is the single most expensive mistake we are asked to correct.
- Day 0 — architecture, data classification, threat modelling and control mapping agreed before anything is built.
- Day 1 — build and qualification: pipelines that emit their own evidence, controlled release, traceability from requirement to deployed model.
- Day 2 — operations: monitoring, drift detection, incident response and change control running as routine practice.
- Day N — sustaining: periodic revalidation, model refresh, and audit support for as long as the system is in service.
The outcome is AI capability that your quality and security functions can sign off on, running on infrastructure your teams already know how to operate.
Choosing a Precision Tier
Precision is the single largest lever on serving cost. The right setting is workload-specific, so we measure before committing.
| Tier | Best suited to |
|---|---|
| FP32 | Maximum accuracy; reference and evaluation baselines. |
| FP16 | Balanced accuracy and throughput for general serving. |
| INT8 | Cost-effective production inference with minimal quality loss. |
| INT4 | Edge, mobile and embedded deployment at the lowest cost. |
Worked example: a 70B-parameter model
| Precision | Approximate weight footprint |
|---|---|
| FP16 | 140 GB |
| INT8 | 70 GB |
| INT4 | 35 GB |
The saving compounds: less memory means fewer GPUs, which means lower serving cost and shorter cold starts.
LoRA or QLoRA
Both train a small adapter over a frozen base model. QLoRA also quantises the base during training, which is what lets a large model be adapted on hardware you can actually get hold of.
| Feature | LoRA | QLoRA |
|---|---|---|
| Training cost | Medium | Low |
| GPU requirement | Higher | Lower |
| Accuracy | High | Very high |
| Enterprise suitability | High | Very high |
Business Outcomes
- Materially lower inference cost through quantisation and distillation
- Reduced dependency on any single third-party AI provider
- Higher answer accuracy through retrieval grounding and validation
- Improved resilience via multi-model routing and local fallback
- Faster, more repeatable deployment through MLOps/LLMOps automation
- AI operating inside your own security and data-residency boundary
- Continuous quality improvement via evaluation and retraining pipelines
AI as an Engineering Platform
We deliver AI as an engineering platform rather than as a single model service. The offering spans the whole lifecycle, and each stage feeds the next:
- Train
- Fine-tune
- Distil
- Quantise
- Ground
- Validate
- Orchestrate
- Monitor
- Retrain
That loop is the point. It lets an enterprise build AI solutions that stay scalable, reliable, explainable and affordable even as models, data and business requirements move underneath them.
Related
This architecture is the reference model behind our AI & Machine Learning Ops practice, which covers how we build and operate these systems in production.