What we do · Build

Full build

A validated prototype becomes a production platform your firm owns. We build it end to end, or we hire, lead and train a team of your own to build it.

3-6 months4 phases2 ways to build
Your own team · Hire

We recruit your engineers

Role specs, technical interviews and shortlists, run by our engineers. The people you hire are the firm's employees from their first day.

the team the product needs
Your own team · Lead

A chief product officer and CTO from Purple

Installed for the engagement to run the roadmap, the architecture and the delivery rhythm while the first layers of the platform go in.

Your own team · Train

Trained in agentic engineering

Your engineers learn to plan, delegate and review work done by coding agents, with specs, tests and security checks written first, while they ship your platform.

Your own team · Keep

The team stays with you

Our leads step back once your head of product is in post. The platform is live, and the team is ready for whatever the firm builds next.

Or we build it end to end. Both routes follow below.

Two ways to build

Two ways to build your platform

The same architecture, the same agent library and the same four phases either way. The routes differ in whose engineers write the code, and who holds the skills when the engagement ends.

01 · Built by Purple

We build it end to end

CPOCTO
02 · Built by your team

We build your team

Who writes the code
Built by PurplePurple's product, design and engineering team, end to end.
Built by your teamEngineers the firm employs, recruited with our technical interviewers.
Who leads it
Built by PurpleOur product and engineering leads, reporting to your partner sponsor.
Built by your teamA chief product officer and a CTO from Purple, installed for the engagement.
How they work
Built by PurpleOur agent library and delivery process, with fee earners testing every week.
Built by your teamThe same process, taught to your engineers: agentic engineering and AI-native software development.
How long
Built by PurpleThree to six months from validated prototype to production.
Built by your teamScoped with you, including the time it takes to hire.
At the end
Built by PurpleA live platform, the IP, the runbook and tiered support.
Built by your teamA live platform, the IP, and a trained product team for whatever the firm builds next.
Suits a firm that
Built by PurpleWants one product live quickly, with Purple on support.
Built by your teamPlans a portfolio of products and wants the capability in-house.
The build · Three to six months

From blueprint to production

Four phases, the same on either route, with working software to review every sprint. Each example below comes from a different practice area.

Phase 01 · Blueprint

The architecture is agreed before development starts

System architecture, API specification, security framework, data model and stack selection, designed for privileged client data and reviewed with your IT, risk and information security teams.

  • System architecture and API specification
  • Zero-trust security in the first diagram
  • Capacity planned for every user and matter it will reach

With your teamYour CTO from Purple owns the blueprint, and your engineers draw it with them.

Phase 02 · Development

Built on our lawyer-trained agents

Core development runs on our library of agents for extraction, chronology, checking and grading. They already handle legal documents, and each one is tuned to your playbook and precedents.

  • Agent library in the core from sprint one
  • Your workflows and playbook encoded
  • Tests and evaluations running from the first sprint

With your teamYour engineers build with coding agents here, pairing with ours until they lead the work.

Phase 03 · Co-creation

Fee earners test it every week

Acceptance testing runs throughout with the lawyers who will deliver through the platform. Their feedback becomes features within a week, so the product fits the workflow on launch day.

  • Continuous acceptance testing with the delivery team
  • Feedback shipped within a week
  • Workflow fit proven before go-live

With your teamYour CPO from Purple runs the sessions, and your team ships the fixes.

  • Trainee · Employment

    The bonus clause flags are in the wrong order

    Shipped · 4 days
  • Associate · Employment

    Can I export the comparison for the client?

    Shipped · 6 days
  • Partner · Employment

    Blocked: can't find the matter number

    Shipped · 2 days
Phase 04 · Deployment

Live, adopted and supported

Production deployment with security hardening, monitoring and support SLAs from launch, and training that makes the first week feel familiar to every fee earner.

  • Production deployment and hardening
  • Training for day-one adoption
  • Tiered support and SLAs from launch

With your teamYour team runs the release and owns support, with our leads on call.

The team route · In detail

A product team of your own, hired, led and trained

For firms that plan to build more than one product. We recruit the engineers, install the leadership and train everyone in AI-native software development while they build your first platform.

  1. Step 01

    Hire

    We write the role specs, run the technical interviews and bring you a shortlist. The engineers are the firm's employees from their first day.

  2. Step 02

    Lead

    A chief product officer and a chief technology officer from Purple join for the engagement to run the roadmap, the architecture and the delivery rhythm.

  3. Step 03

    Train

    Agentic engineering and AI-native software development, taught on the firm's own codebase while the team ships the platform.

  4. Step 04

    Hand over

    Once your own head of product is in post, our leads step back. The team, the platform and the practices stay with the firm.

CPOCTO
At the start · Our leads, your hires
CPOCTO
Mid-engagement · Shipping with agents
HEAD OF PRODUCTON CALL
At the end · Your team, our leads on call
The curriculum

Agentic engineering, on your own codebase

Your engineers learn the way our team builds: coding agents doing the heavy lifting, people setting the spec and reviewing every change, and security checks built into each release.

Curriculum · Five modulesTaught while the platform ships
  1. 01Working with coding agents: planning, delegating and reviewing their work
  2. 02Specs, tests and evaluations written before the code
  3. 03LLM pipelines, retrieval and evaluation for legal documents
  4. 04Client confidentiality, ethical walls and audit, by design
  5. 05Product practice: discovery, roadmaps and measuring adoption
What you leave with

The keys, the manual and the deed

  • The platform

    Both routesA production platform on enterprise architecture, deployed and monitored.

  • The IP

    Both routesEverything we build belongs to the firm, from the first line of code.

  • Runbook & training

    Both routesDocumentation, training and support structures the firm runs itself.

  • Ongoing support

    Built by PurpleTiered support with SLAs and strategic reviews from launch onwards.

  • The team

    Built by your teamEngineers and a head of product trained in agentic engineering, ready for the next product.

From our work

Products we have built, teams we have led

Legaltech we have built runs in over 150 UK and US firms, on the foundations we will use for yours. For one international firm's legaltech spin-out we stepped in as fractional COO and then acting CEO, taking an internal product to live client pilots.

See PathwayRead the spin-out case studyStart with a four-week prototype

UK and US firms run legaltech we built
150+
Years building legaltech for Big Law
20
Months, prototype to production
3-6
The first step

Build the platform your firm owns

Bring a validated prototype, or start with one. Tell us which route suits the firm and we will scope it with you.