Carl Saginsin

Founded BuildFast Labs to help startups and growing teams ship production-ready software at the speed modern markets demand. After years of architecting AI-powered platforms, leading engineering teams, and building full-stack systems from zero to scale, I started BuildFast Labs to bring that same velocity and engineering rigor to founders who can't afford to move slow.

At BuildFast Labs, we partner with startups, SMBs, and product teams to design, build, and ship AI-first web and mobile applications — from MVPs to full production platforms. We treat every engagement like our own product: clean architecture, real-time capabilities, AI-native workflows, and a relentless focus on shipping.

• Set company vision, technical direction, and go-to-market strategy.
• Lead client engagements end-to-end — from product discovery to architecture to delivery.
• Drive our AI-first engineering practice across web, mobile, and backend systems.
• Build and mentor a team of engineers, designers, and product thinkers.
• Partner directly with founders and operators to turn ideas into shipped products.

Leading the design and development of AI-powered fitness management systems using React.js, Express.js, Prisma/MySQL, and OpenAI APIs. Spearheaded the Command Center project — a modern, full-stack dashboard that helps fitness professionals manage clients, sync data with Trainerize, and deliver real-time, AI-assisted workout recommendations.

• Architected scalable backend services using Express.js + Prisma ORM, handling real-time messaging, Trainerize webhooks, and AI-driven responses.
• Developed an interactive frontend with React.js (Vite) and TailwindCSS, ensuring a responsive, mobile-first design optimized for performance and usability.
• Integrated OpenAI GPT-4o-mini to generate personalized workout plans and contextual AI chat features for fitness coaches.
• Implemented real-time synchronization using WebSocket and webhook systems, providing instant updates for client and message data.
• Designed and managed robust MySQL database schemas to efficiently store client data, chat logs, and AI templates.
• Optimized development workflow through a clean CI/CD pipeline, cost-efficient infrastructure, and modular feature deployment.
• Collaborated closely with product stakeholders to align technical decisions with business goals, ensuring scalable, maintainable, and impactful delivery.