Stephen Karanja
Systems Portfolio

Systems I’ve Built

Built for high-growth companies. Real systems, real numbers, no consulting-deck estimates.

SUCCESS: 62% REVENUE GROWTH

Omni-Channel Prediction Engine

Scalable forecasting system for luxury retail supply chains.

Problem

Inventory dead-stock costing $4M annually due to manual demand forecasting errors.

Approach

Transformer-based time series modeling integrated with real-time POS data streams.

Stack

PythonPyTorchAWS SagemakerSnowflake

Outcome

94% forecast accuracy reached within 3 months of deployment across 400 locations.

Business Impact

+$12.4M ARR Optimized

SUCCESS: 30% CHURN REDUCTION

Behavioral Retention Loop

Agentic intervention system for SaaS user lifecycle management.

Problem

High churn among premium users failing to discover key features within the first 14 days.

Approach

LLM-orchestrated autonomous agents monitoring user events to trigger personalized tutorials.

Stack

GPT-4oNode.jsPostgreSQLRedis

Outcome

Customer lifetime value (LTV) increased by 22% within 6 months post-launch.

Business Impact

$1.8M Retained Value

IMPACT: 24/7 AUTO-RESOLUTION

Self-Healing Network Grid

AI-Ops infrastructure for zero-downtime distributed systems.

Problem

Service interruptions causing $15k loss per minute during peak e-commerce events.

Approach

Anomaly detection and automated rolling rollbacks via ML-driven cluster observation.

Stack

PrometheusRustGrafanaTerraform

Outcome

Mean time to resolution (MTTR) reduced from 45 minutes to 30 seconds.

Business Impact

99.999% SLA Guaranteed

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