RainbowSoft
Service

Technical Co-founder

A senior engineering partner who owns architecture, hiring decisions and the roadmap, so you can focus on customers and fundraising.

All services

Non-technical founders often need more than a vendor. We act as your fractional CTO: we shape the product with you, make the hard technical calls, and build it with the same care we'd give our own company.

Who it's for
  • Non-technical founders validating a new idea
  • Startups between seed and Series A without a full-time CTO
  • Teams that need a senior voice in investor and due-diligence conversations
What you get
  • Product and technical roadmap tied to business milestones
  • System architecture, infrastructure and security baseline
  • Hands-on development by the core team
  • Technical due-diligence support for fundraising
  • Hiring plan and handover when you build your in-house team
Typical stack
Next.jsNode.jsPythonPostgreSQLAWSVercel
The outcome

A product your investors trust and an engineering foundation your future team can grow on.

How it works

From first call to launch, and beyond

  1. 01

    Discovery

    We dig into your goals, users and constraints, then turn them into a prioritized scope, timeline and budget.

  2. 02

    Design

    We map user flows and build clickable Figma designs, so you see and test the product before we write code.

  3. 03

    Build

    We work in short, transparent sprints with weekly demos, so you always know what shipped and what's next.

  4. 04

    Launch

    We handle QA, deployment, app-store releases, monitoring and analytics, and launch day goes smoothly.

  5. 05

    Support

    After launch we keep improving: fixes, new features, scaling and performance tuning as you grow.

Ready to talk about Technical Co-founder?

Tell us what you're working on. You'll hear back from a senior engineer, not a salesperson.