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PTEN

About

Engineering
you can measure.

A software house for AI architecture and engineering. We build websites, business systems, apps, SaaS and AI agents for companies, with the same rigor from diagnosis to measurement.

01The name

Δ = after − before

Say it ka-DEL-ta.

Delta is the letter engineering uses for change: the value after minus the value before. The logo has two, one at each end of the name: the starting point and the result. The work sits between them, and it has to be measurable.

02Who does the work

The founder on every project.

Clients talk directly to the person who designs and builds. Each project brings together the specialists it needs (design, data, AI, infrastructure, marketing), always with the same method.

  • Rogério Costa

    Founder · AI architecture and engineering

    Leads the architecture, AI engineering and product of every project: websites, systems, apps, B2B and B2C SaaS and AI agents.

  • Partner network

    Growth, marketing and media

    Partners who join when the project needs them, from discovery to growth: market research, media, content and growth.

03Experience

From prototype to operations.

We build custom software for companies: websites that sell, systems that organize operations, apps, SaaS and AI agents. The experience comes from taking products from first prototype to operations with paying customers, in startups and in established companies.

  • Startup

    From zero

    Validate before investing, cut what is not essential, reach the first customer.

  • B2B SaaS

    For companies

    Roles, integrations, billing, management dashboards and support for the people who operate them.

  • B2C SaaS

    For people

    Mobile first, frictionless sign-up and every step of the funnel measured.

  • AI

    Agents in production

    Service and operations agents running with real customers, with cost and accuracy measured.

04Principles

What we do not negotiate.

  • Measure before claiming

    No number without a source and a date.

  • The client owns code and data

    A dedicated database, and everything handed over if the contract ends.

  • One person you know

    Whoever answers knows the system.

  • Privacy by default

    From the design up, not patched on later.

05Partners

A network of partners.

We work with several growth, marketing and media partners. They join from discovery, helping to understand the customer and the market, and stay on for growth after launch.

Tell us what you want to build.

A person reads it and replies. No bots, no queue.

Book a call [email protected]