Product Advantage LLC provides fractional CTO services, SaaS MVP development, AI-built app rescue, and technology advisory for startups, growth-stage companies, and established businesses that need senior technical leadership without a full-time executive or an agency.
I run a small, senior technology practice. I build MVPs, rescue AI-generated codebases, embed with product teams, and provide fractional CTO and advisory services to startups, growth-stage companies, and established businesses whose technology has outgrown the people running it. You work with me directly, start to finish.
Fractional or interim. Senior technical leadership for the months before you hire a CTO, the gap between leaders, a diligence or acquisition, or the business where technology is on the critical path but isn't the product. Strategy, architecture, hiring, vendors, security, and M&A.
Learn more →Got an idea? I'll build your first version and get it in front of users. Most MVPs launch in 4–6 weeks with scope and price agreed up front, and auth, payments, and integrations included.
Learn more →Your Lovable, Bolt, v0, or Cursor prototype works in the demo and breaks under real users. I stabilize it: real auth, error handling, tests, and code a team can maintain.
Learn more →The pilot ran and nothing changed. I help you pick the few AI and technology investments worth making, write the build-or-buy answer, and then help you ship them.
Learn more →AI company that needs shipping, not slideware? Embed a senior engineer on agents, integrations, evals, and the production path. One person on your critical path.
Learn more →Fractional help is a bridge. I build the team that outlasts it: roles, hiring, onboarding, and process, handed off to your own lead. Or a managed team I lead for you long term.
Learn more →Law firm? Legal technology and firm operations live at BetterDocket, a DBA of Product Advantage LLC.
I'm Justin VanWinkle. Fractional and interim CTO since 2023, CTO at Hook Security, and founder of BetterDocket, the matter-management platform for small law firms. Before that: M&A integration lead and principal product manager at IBM, solutions architect for Fortune 500 clients, and a US Air Force crew chief.
Direct access to the person making the technical decisions. No account manager. No junior-dev rotation. If I'm not the right fit, I'll tell you, and I'll usually tell you who is.
The best way to judge a fractional CTO is to look at what they've built with their own name on it. These are live, with paying customers.
From services company to platform. A venture-backed cybersecurity SaaS company, 12 people, 5-person technology team. Joined as fractional CTO, stepped into the full-time seat for the platform build and SOC 2. 200,000+ monthly active users, SOC 2 in three months, ARR 2.2x.
Read the case study →Matter management for small law firms. Tasks, documents, deadlines, messages, time, and invoices connected around each case, plus a client portal and a built-in copilot that proposes editable actions for approval.
betterdocket.com ↗A free, local meeting-notes app for Mac and Windows. Records, transcribes, and summarizes meetings on your machine, with no account required. Built to show what careful, privacy-first AI product work looks like.
Learn about Spectator ↗For PE portfolio companies, venture-backed teams, and the operating partners who support them. A technical resource you can send in before the deal, during a transition, and after the close. I sit on the investor side too, through our family office and as technical advisor to DeepWork Capital's Fund 3 portfolio.
The seat covered for a fixed term through a CTO transition, a raise, or a sale. Three to four days a week.
Learn more →Buyer-side or sell-side. A data-room-ready report on architecture, security, team, delivery, cost, and AI claims in two to three weeks.
Learn more →Type I or Type II, led by a CTO who passed SOC 2 in three months at Hook Security without stopping product work.
Learn more →Systems, team, and product integration for acquirers and PE platforms doing add-ons. On schedule, with the acquired team retained.
Learn more →I lead our family investment office, which invests directly in technology startups and in venture funds such as DeepWork Capital Fund 3. That means the technical due diligence I do for clients is the same diligence I do before writing a check.
Software, AI, vertical SaaS, and tools for professionals. Founder-first, technically rigorous.
Including DeepWork Capital Fund 3. Access to the broader early-stage ecosystem and co-investment flow.
Tell me what you're building, what's broken, or what decision you're stuck on. You'll get a reply within one business day, honest feedback, and no follow-up sequence if we're not a fit.