Revenue engines
Custom quoting, CPQ and quote-to-cash flows, plus proposal and RFP experiences that carry a deal from first price to signature.
Built outside your platform. Wired natively into
HubSpot
Salesforce
Any CRM
Your data lake
For decades, the question was “can we build it?” Now the question is “what should we build?”
That shift is the whole story. Custom software used to mean big budgets, long timelines and a team you could never keep busy. AI changed the math. The parts of a business that never fit a template can finally have tools that fit them.
We call it creative technical freedom: permission to design what you actually need instead of bending your process around what you could buy. Brainstem Ventures exists to use that permission well, with taste, engineering rigor and a straight answer about what's ready and what isn't.
Your platform is the frame. We build the engine.
HubSpot, Salesforce and the rest handle the common 70–80% well. The last 20–30% is where your business is different, and it's exactly what off-the-shelf tools handle worst. Pick your platform and the part it can't do.
Your platform
The part it can't do
- The frame
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- The wiring
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- The engine
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What we build when the template runs out
These are the kinds of work that keep coming back. Most projects blend two or three.
Lead and data flow
Routing, relays and sync engines that move each record to the right place and keep your systems in agreement.
Client portals
Command centers your customers log into, running on the same data your team works from.
Intelligence and audits
Tools that read a platform end to end and tell you what to fix, or what to sell next.
Story and media
Animation, video, characters and sound, produced with the same AI pipeline as the software.
New ventures
Products of our own, built to prove what the studio can do before we promise it to anyone else.
Selected builds
Custom builds that live outside the platform and plug natively into HubSpot.
Plugs into HubSpot
Quote simulator with built-in e-signature
A pixel-faithful, interactive quote simulator with the full e-signature journey built in, from first price to signed agreement. Quote-to-cash as one continuous experience instead of five disconnected tools.
Plugs into HubSpot
Bespoke CPQ
A React proposal and pricing experience built to show where a custom CPQ beats HubSpot's native quoting.
Plugs into HubSpot
Lead relay and distribution
A relay that takes in every inbound lead and distributes it to [the right reps or dealers: confirm wording], without anyone sorting a shared inbox.
Plugs into HubSpot
Workflow dependency map
Maps how every workflow in a HubSpot portal depends on the others, so teams see the blast radius before they change anything. One portal mapped: 248 workflows and 181 dependencies.
Plugs into HubSpot
Proposal and sales-sheet platform
A full proposal platform with an AI parser, agenda builder, client dashboards and password-gated documents, plus a data-driven sales-sheet engine.
How an idea leaves the page
Follow one idea from the first pencil line to something real, wired into everything around it and growing with every version. Press play, or drag through the five stages.
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What you get{{howGet}}
We won't promise fast. We will show you working software early and tell you plainly where it stands.
Watch a team of agents build an idea
Nexus is our multi-agent orchestration platform. Six specialized agents take an idea from discovery to blueprint, technical design, code and tested deployment, coordinated by one orchestrator, and every change runs through the quality gates. Pick an idea and run it.
Pick an idea
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A simulated run, sped up
Nexus
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40 gates, 296 assertions
+{{nxLearned}} learned this session
Quality gates40 gates, 296 assertions
Nexus checks itself against these gates on every change, so the platform can't quietly regress.
A memory for mistakes42 regression suites
Bugs we've already fixed are pinned down by regression tests, so they can't quietly come back.
Agents that learnLive playbooks
Lessons from QA reviews are written into shared playbooks that every agent reads, so each build starts smarter than the last.
Self-evolutionImproves itself on demand
A self-evolution engine reviews the platform and drafts its own improvement directives whenever we run it.
Conversational controlBuilt from a chat
Nexus connects to Claude over MCP, so builds can be dispatched, checked and steered from a conversation.
Request early access
Nexus is in private beta while we harden it, and we review every application.
Every innovation department needs somewhere to tinker and play. Ours turns out characters, films, tools and the occasional product. Some ship. All of them teach us something we bring back to client work.
Maya and the Spark
An animated character series for team training and keynote talks, built around one mantra: dare to be different.
FanLoco
A private, kid-safe home for a youth sports team's whole season: schedule, game replays, photo walls, a self-updating record and digital player cards. Live now for soccer.
GoalCard
Collectible digital player cards for youth soccer, with rarity tiers, media galleries and three account roles. Live at goalcard.pro.
Screen Sidekick
A screen-aware voice assistant that coaches you while you build.
Quest Academy
A distraction-free learning canvas for 4th and 5th graders, built on incremental mastery.
New from the lab · Spark
Meet Spark, the AI sidekick that keeps your team moving.
Your people ask out loud and Spark shows them the next step in any platform: client portals, CRMs, design tools, admin consoles. No guides to build, nobody pulled off their own work, and work moves between machines in one drop.
- Any platformYours, your clients' and your vendors'
- Faster ramp-upNew hires productive in days
- Spark DropFiles and prompts between machines
