53d North / AI Engineering

AI system development: Engineered like software. Not prompted.

Build turns the use case you agreed in Assess into a working, tested AI system. We engineer it through two production lines, our Code Factory and our Data Factory, so every change is planned, traceable and security-reviewed. Then an engineer approves it before it ships.

2Factories: one for code, one for data
5Layers of the AI stack considered in every design
1Git branch per job, so every change is traceable
0Changes shipped without a human sign-off
01 Assess02 Build03 Deploy04 Scale

The human edge: Agents give us speed. People give it direction.

Our code and data factories make us fast, but speed only counts when you're heading the right way. Every build is led by experienced engineers who have shipped real systems for real businesses, and who know where AI helps, where it doesn't, and where it can do harm.

That's the part you can't download, and it runs through every stage below. Look for the green markers.

Our agentsOur team
Write code fastDecide what's worth writing, and what's better left out
Follow the specChallenge the spec when the business has moved on or the data says otherwise
Pass the testsCheck it works in the real world by sitting with the people who'll use it
Flag security patternsOwn the risk decisions on data protection, security and compliance, and sign them off
Know the documentationKnow your sector, from automotive retail to contact centres and utilities
Work around the clockPick up the phone and take responsibility when something goes wrong

Judgement

Knowing when a rule, a report or a plain database query beats a model, and saying so, even when it's a smaller job for us.

Sector knowledge

Years of building for dealer groups, contact centres and service businesses. We already know your systems, your customers and your regulators.

Data protection built in

Our CTO is also our named Data Protection Officer, and every build runs under our ISO/IEC 27001-certified information security management system. Compliance is part of the design, not an audit at the end.

Bringing your people with you

AI only pays off when people use it. We test with your staff, train them, and adjust the system around how they really work.

Where people step in, every build
  1. Set directionUse case agreed with your decision-maker
  2. Approve the specRequirements signed off before code
  3. Shape the architectureModels, hosting and data flows chosen by engineers
  4. Review every mergeNo code ships unreviewed
  5. Promote the dataStaged data checked before it goes live
  6. Sit with usersPilot feedback in person, not just in logs

From Assess to Build: Your use case card becomes the spec.

We don't start from a blank page. The decisions made in Assess are turned into requirements with acceptance criteria, and every test we write traces back to one of them.

In · from Assess
  • AI Use Case Card and brief
  • Target users and the problem
  • Business goal and success measures
  • Data, risk and feasibility assessment
Out · into Deploy
  • A working system, tested in staging
  • Clean, governed data pipelines
  • Evidence the success measures can be met
  • Documentation, runbook and handover pack

The AI stack: AI is a five-layer cake.

NVIDIA describes AI as a five-layer stack: energy, chips, infrastructure, models and applications. Each layer depends on the one beneath it, and the economic value shows up at the top.

Small and medium businesses don't build power stations or chips. But every layer still shapes what your system costs, how fast it runs and where your data goes. We engineer the top three layers and design around the bottom two.

Where we engineer
What we design around

Select a layer to see what it means for your build.

Applications

Layer 5 of 5
What Applications means

Where economic value is created. Models put to work on real problems, from drug discovery to robotics.

What it means for your build

This is your use case from Assess: agents, assistants and automations wired into the systems you already run, such as your CRM, dealer system or finance platform. Our Code Factory builds this layer.

The question we answer

Does it change how the work gets done, and can we prove it?

Human edge

An engineer and your users decide when it's ready for pilot. Passing tests isn't enough on its own.

Models

Layer 4 of 5
What Models means

Systems that understand language, and also biology, chemistry, physics and the physical world. Language models are only one kind.

What it means for your build

No single model is right for every task. We test frontier, open and small specialist models against your own data, then choose for each task on accuracy, cost, speed and where the data can go.

The question we answer

Which model is good enough, at the lowest cost and risk?

Human edge

Engineers read the evaluation results and make the call, including saying no when no model is good enough yet.

Infrastructure

Layer 3 of 5
What Infrastructure means

Land, power delivery, cooling, networking and the systems that connect thousands of processors. NVIDIA calls these "AI factories".

What it means for your build

For you, this layer decides where the system runs and where your data lives: a cloud API, UK hosting, your own tenancy or on-premises hardware. UK GDPR and data residency are settled here, and our Data Factory builds the data foundation underneath.

The question we answer

Where should this run, and where is the data allowed to go?

Human edge

Our CTO, who is also our named Data Protection Officer, signs off where your data goes and how it's protected.

Chips

Layer 2 of 5
What Chips means

The processors that turn energy into computation at scale, built for parallel work, high-bandwidth memory and fast interconnects.

What it means for your build

You won't buy chips, but they still set your speed and your bill. We size each workload so you aren't paying for frontier-scale compute on a simple classification task. Smaller models on modest hardware often do the job.

The question we answer

Are we paying for more compute than the task needs?

Human edge

We explain the cost trade-offs in plain English, so you choose knowing what you're giving up.

Energy

Layer 1 of 5
What Energy means

The foundation. Power has to be generated in real time, and it limits how much intelligence can be produced.

What it means for your build

Every token costs power and money. We design for efficiency with caching, batching, shorter prompts and smaller models where they're good enough. That keeps running costs predictable and the footprint down.

The question we answer

What does each answer cost to produce, and can it cost less?

Human edge

You get a running-cost forecast you can budget against, and we go through it with you.

How we build: Two factories. One standard.

We build with our own agentic engineering platforms. Specialist AI agents do the repetitive work at speed, and our engineers set the direction, check the output and approve what ships. That's how a small, senior team delivers production-grade systems on an SME budget.

Code Factory

Layer 5 · Applications

An AI-native software lifecycle. Specialist agents plan, build, test and review, with git as the backbone and an engineer in charge.

  1. 01
    Analyst agentTurns the use case into requirements with acceptance criteria
  2. 02
    Lead agentPlans the job and picks up from the project journal, so no context is lost between sessions
  3. 03
    Specialist buildersAgents hand work to whichever specialist is best suited to it, on its own git branch
  4. 04
    Independent verificationA different model checks the lead agent's work, so no model marks its own homework
  5. 05
    Security & compliance reviewA reviewer agent reads the delivered code cold, with no build context, to spot risk
  6. 06
    Engineer review & mergeTests trace back to requirements. Nothing merges without approval
Inside the Code Factory →

Data Factory

Layer 3 · Data foundation

Agentic workflows built only for data. Everything is driven from the platform, with no one-off scripts or hand-written SQL in production.

  1. 01
    Sources & schedulesConnect your systems and files, and set how often each refreshes
  2. 02
    Schema & mappingAgents propose the model and mappings, and engineers confirm them
  3. 03
    Data auditField-level quality checks, duplicate detection, and live email and phone verification
  4. 04
    Data strategyScoring, de-duplication and business rules applied consistently every run
  5. 05
    Publish to stagingSchema and data are written to a staging database, never straight to live
  6. 06
    Review & promoteYour systems pull from staging once the data has been checked and approved

Our build standards: Fast, but never unchecked.

01

Git is the backbone

Every job gets its own branch and commit history, so you can see exactly what changed, when and why.

02

Requirements trace to tests

Acceptance criteria are written before the code is. If a test can't point to a requirement, it doesn't count.

03

A second model checks the first

Lead agents are verified by a different model, which catches the blind spots a single model shares with itself.

04

Security reviewed cold

Our security and compliance reviewer sees only the finished code, so it judges what was built rather than what was intended.

05

Staging before live

Code and data both land in staging first. Nothing reaches your live systems without a check.

06

Engineers own the outcome

Agents make us fast. Accountability stays with the people whose names are on the work.

Layer 4 in practice: The right model, in the right place.

We aren't tied to one model provider. Every model choice is tested against your own data and use case, then weighed against cost, speed and where your data is allowed to go.

Accuracy on your dataCost per taskLatencyData residencyVendor lock-in
Frontier APIs

For the hardest reasoning

Leading commercial models for complex reasoning, writing and agentic work, used where their quality pays for itself.

AnthropicOpenAI
Open models, self-hosted

For control and privacy

Open-weight models run on infrastructure we or you control, so sensitive data never leaves the boundary you set.

UK hostingYour tenancyOpenAI-compatible endpoints
Small & specialist

For speed and scale

Compact language models and fine-tuned classifiers for high-volume, well-defined tasks, at a fraction of the cost per call. We benchmark them on our in-house NVIDIA hardware before we recommend them.

Local inferenceFine-tuned classifiers

What you get from Build: Working software, not a demo.

  • A working system in staging
    Built against the agreed requirements and tested with the people who will use it.
  • Production-ready data
    Audited and de-duplicated pipelines, published through staging.
  • Full traceability
    Requirements, tests, branches and review records you can hand to an auditor.
  • Security & compliance evidence
    Review findings and fixes, plus the input for your data protection impact assessment.
  • A pilot verdict
    Measured against your success criteria: scale, iterate or stop.
Example build log
job/quote-drafting · branch feat/advisor-quote-draft
analyst   12 requirements · 31 acceptance criteria
lead      plan created · resumed from journal
builder   api, prompt pack, dealer-system connector
verifier  plan + diff checked by second model  ✓
security  cold review · 2 findings · 2 fixed  ✓
tests     31/31 criteria passing  ✓
data      audit: 0.4% duplicates removed · staged  ✓
awaiting engineer approval → merge to staging
Questions · Build

Common questions about how we build AI systems.

Do AI agents write all the code?

Agents do much of the volume work, but engineers set the direction, approve every plan and review every change before it merges. No code ships without a human sign-off.

What is the Data Factory?

Our agentic platform for data work. It connects your sources, maps schemas, audits quality and duplicates, applies your business rules and publishes to a staging database, where the data is checked before it goes live.

How do you test what you build?

Requirements are written with acceptance criteria before the code, and every test traces back to one. Work is also checked by a second model, reviewed for security without context, and tested in real browsers where users will click.

Which AI models do you build with?

We're not tied to one provider. We test frontier models such as Anthropic Claude and OpenAI, open models we can self-host, and small specialist models against your data, then choose for each task on accuracy, cost, speed and data residency.

What is NVIDIA's five-layer cake?

NVIDIA's description of AI as five layers: energy, chips, infrastructure, models and applications. We engineer the top three layers for you and design around the bottom two to keep speed and running costs under control.

Next: Deploy: From staging to production, properly.

Once the pilot meets its success measures, we move it into production on infrastructure you control, with the monitoring and governance to match.

The five-layer model is NVIDIA's, as described by Jensen Huang in "AI is a 5-layer cake" on the NVIDIA blog. The interpretation for small and medium enterprises is 53d North's own. NVIDIA is a trademark of NVIDIA Corporation.