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    Schedule B.3 · Product Extensions & Integrations

    New features and integrations for a product that already exists.

    For live products that need something added: a new feature, a third-party API, a payment system or a workflow improvement, built inside your existing codebase.

    Each addition is scoped and priced upfront. If you have a technical lead, they keep the direction; who decides what, and how the work fits your codebase, is agreed before work begins. Your team gets handover notes at the end.

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    Terms. Product Extensions & Integrations

    Agreed before the build

    For
    For existing products that need new features, APIs, payment systems or workflow improvements.
    Typically
    • Work inside your existing codebase
    • Third-party APIs and payment systems
    • Each addition scoped and priced upfront
    • Handover notes for your team
    Price
    Each addition scoped and priced upfront.
    Process
    Discovery, written scope, proposal, build, launch and handover: the same six steps as every engagement.

    This fits when

    1. Whereasyou have a live product and a defined addition to make;
    2. Whereasyou need execution capacity for a fixed piece of work, not a permanent hire;
    3. Whereasyou want the price known before the work starts.

    Look elsewhere when

    1. Whereasthe work has no defined end: a fixed-price engagement cannot cover open-ended changes.

    Questions. Asked before signing

    What if I already have a technical co-founder or CTO?

    Then I add execution capacity for a defined piece of work.

    Your technical lead keeps the direction. Who decides what, and how the work fits your codebase, is agreed before work begins.

    How does fixed-price development work?

    The project starts with discovery and scope definition.

    The proposal documents the deliverables, exclusions, timeline, price, milestones and acceptance criteria. Anything outside the agreed scope is assessed and quoted separately before any work on it starts.

    What technologies do you use?

    Mostly Next.js, React and TypeScript on the web, Node.js or Django on the backend, PostgreSQL or MongoDB for data, and React Native with Expo for mobile apps.

    The stack for your project is agreed in the proposal. Not every project uses the same one.

    Do you sign an NDA?

    Yes. Tick the NDA box on the contact form and we'll have one signed before you share anything confidential.

    Can my own team take over?

    Yes. Handover includes the source code, documentation and deployment access, so your team or another developer can carry on from where the build ends.

    All questions

    Have a product to build?

    I read every enquiry myself and reply within one business day.

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