Builder Program For Software Engineers

We Design and Sell. You Build.

Calsix Ventures finds the problem, designs the product, and secures paying customers — before you're involved. You get a complete spec and a direct share of revenue from the day it ships.

How it works → Get in touch ↓
15%
revenue share · from launch
Of net revenue.
$1M
earnings ceiling · per product
Independent across products.
Day 1
earnings start · at launch
One Milestone. No thresholds.
B2B
structure · LLC required
Commercial arrangement, not employment.
The model

You don't inherit the risk.
We absorb it first.

Before a builder is ever involved, Calsix Ventures identifies a specific pain point inside a vertical SaaS domain, validates it with real companies, and signs a founding customer. The product is designed, the spec is written, the API access is confirmed. By the time you see it, the question of whether the market wants this has already been answered.

Your role is the production build. Not the sales call. Not the pitch deck. Not the customer relationship. A complete spec, a defined scope, and a direct share of every dollar the product generates — from the day it goes live.

When the product stabilises, a support team takes over. You move to the next product. Your earnings from the first one keep running.

Before you start: problem validated, customer signed, spec written, API access confirmed. After you ship: revenue share activates at launch, maintenance transitions, you stack the next one on top.

Process

What happens before
you write a line of code.

01
We find a problem the market has already confirmed
We identify a specific pain point inside a software platform with a large installed base. We test it with real companies before we design anything.
// "What if nobody wants this?"
02
We secure a paying customer before the spec exists
A founding customer commits before you're involved. The revenue is real before you write a line of code.
// "What if the product never generates revenue?"
03
We design the product and write the complete spec
Data sources, API access, user flows, scope boundaries — all delivered before you start. Narrow, focused products. Not platforms. Not roadmaps.
// "What if the spec is bad and I build the wrong thing?"
04
You execute the spec independently
You make the architecture calls. We're available to clarify, not to manage. The scope is deliberate — these aren't sprawling products.
// "Will I have a manager breathing down my neck again?"
05
Revenue share activates the day it hits production
We handle go-to-market, pricing, and the customer relationship. Your 15% starts at launch. No beta thresholds. No revenue minimums.
// "When do I actually start seeing money?"
06
You move to the next product. The first one keeps running.
Once stable, a support team takes over maintenance. You stack a new product — and a new revenue stream — on top of the one already earning.
// "Is this a one-time thing or can it compound?"
Arrangement

Your scope is the build.
By design.

// you
The engineering.
That's it.
  • Backend architecture built to scale — not just to ship
  • Secure data handling — these products touch real business data
  • Systems thinking before feature thinking
  • APIs designed for reliability under real load
  • Clean, maintainable code a team can own after you move on
  • An active LLC for the commercial arrangement
// calsix ventures
Everything
else.
  • Market research and validation — done before you're involved
  • Product design and complete spec — ready before you start
  • The founding customer — signed before you write a line
  • All pricing, sales, and customer relationship management
  • All go-to-market, support, and post-launch operations
  • IP ownership of all work product
  • A pipeline of products to keep your earnings growing
Terms

The numbers. Set before
you start. Unchanged at the end.

These aren't equity promises. There's no vesting schedule, no cliff, no "we'll revisit when we raise." The terms are defined before the build starts and don't move.

How much you earn depends on what the product generates. We validate and sign a customer before you're involved — but revenue share on a product that hasn't shipped yet is not a salary. We're not going to pretend otherwise.

What is guaranteed: the percentage, the ceiling, and the day it starts.

Three products means three independent ceilings. Each governed by the same terms. Each starting the day it ships. The $1M ceiling is per product, not per relationship.

15%
// revenue_share
Of net revenue from production launch. Not net. Not adjusted.
$1M
// earnings_ceiling
Per product. Independent across every product you contribute to.
↑ D1
// trigger
Activates at production launch. No beta thresholds. No revenue minimums.
∿ Active
// requirement
Tied to active contribution. Stops cleanly when you transition off the product.
Selection

This isn't for everyone.
It might be for you.

We're looking for engineers who build for production, not demos — people who've shipped things other people depend on and know the difference between code that works and code that holds. If that's not you yet, this arrangement won't be a good fit for either side.

// 01
You build for production, not for demos
You think about data models, failure modes, and scale before you think about the UI. You've built things other people depend on. You know the difference between code that ships and code that holds up.
// 02
Security and reliability are defaults, not afterthoughts
These products handle real business data — invoices, billing history, customer records. Auth, rate limiting, input validation, and secure API design are part of how you think, not things you add at the end.
// 03
You work independently from a clear spec
You can take a well-defined brief and execute without daily direction. You surface blockers early. You don't need sprint planning or standups to stay on track.
// 04
You want revenue upside without the business overhead
No sales calls. No customer management. No go-to-market. You earn a direct share of what you ship, from the day it launches. An active LLC is the one hard requirement.
// get in touch

Tell us what
you've built.

We respond to every message, usually within 48 hours. No commitment required on either side.