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Kolby Kalafut
Senior Full-Stack Engineer specializing in e-commerce and operations platforms
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About
Sole software engineer for an ecommerce operation who ships and operates full-stack products end-to-end. Built a production AI voice agent integrated with Shopify and internal systems that now handles 4,000+ customer calls/month, plus a branded mobile app credited with $4M+ in sales and a self-serve returns/warehouse platform with strong React/TS UX and robust AWS operations.
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Key Strengths
- End-to-end ownership of production AI voice agent handling 4,000+ customer calls/month
- Built customer-facing ecommerce products driving $4M+ in sales (branded mobile app)
- Strong product engineering focus (70–80% customer-facing) with supporting DevOps/reliability ownership
- Designs reliable Python/FastAPI services with layered architecture, versioned APIs, standardized errors, and strong observability
- Data integration and contract design across disparate systems (Shopify, internal tools, content stores) to ensure real-time accuracy
- Iterative conversational flow tuning using transcripts/metrics to improve completion/deflection while preserving CSAT
- Designed scalable PostgreSQL inventory/warehouse schema with movement ledger, indexing strategy, and iterative migrations
- AWS production operations and incident handling: scaled under traffic spikes, mitigated third-party API bottlenecks, added async queueing and improved autoscaling/alerts
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