Technical Co-Founder & CTO
Partnering with visionaries to build scalable SaaS products.
Technical co-founder and fractional CTO for non-technical founders. Owns the entire stack, from architecture through to production infrastructure.
I build software and AI solutions, automate the manual work slowing teams down, and ship MVPs in weeks, not months.
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Technical Co-Founder & CTO — overview
Many great products stall because the founder can sell and validate but cannot build. A technical co-founder closes that gap — not by taking orders, but by owning the entire technical side of the company: architecture, delivery, hiring the first engineers, and the infrastructure decisions that determine whether the product can scale. Sharon Rosario takes on this role for founders who need a real engineering partner, not an agency.
The difference between a contractor and a technical co-founder is accountability for outcomes. Sharon thinks in terms of the business — runway, time-to-market, and what actually moves the metric — and translates that into an architecture and a build sequence that a small company can afford and maintain.
Owning the technical stack end-to-end
From the first commit: system design, the data model, security and multi-tenancy, the API and frontend, and the CI/CD and cloud setup that ships it. As the product grows, that extends to observability, cost control, and the technical hiring plan.
The goal is a product that scales with investment rather than one that needs to be rebuilt the moment it gets traction.
For non-technical founders
Sharon partners closely with sales- and marketing-led founders, translating a product vision into concrete engineering trade-offs and explaining them without jargon so the founder can make informed decisions about scope, speed, and cost.
Related case studies
Zero-Leak Multi-Tenant RAG Architecture
Building a B2B AI product where one customer can never read another customer's data — using Postgres Row-Level Security and pgvector.
Read the case studyI Built a Claude Code Skill That Tells Me Not to Build Things
An open-source Claude Code skill with a validation gate that can return DON'T BUILD — four kill criteria, state on disk, and milestones sized to one conversation.
Read the case studyFrequently asked questions
A contractor delivers a defined scope. A technical co-founder owns the entire technical direction of the company — architecture, delivery, security, infrastructure, and early hiring — and is accountable for the product succeeding in production, aligned to the business goals and runway.
Yes. Sharon can own architecture and technical delivery for early-stage SaaS on a fractional basis — setting the stack, shipping the product, and putting the practices in place before a full team exists.
Typically non-technical founders with a validated idea or early traction who need a partner to own the build — especially those creating AI-powered or multi-tenant B2B SaaS.
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