Derrick Mureithi

Full-Stack Digital Marketer and AI Developer with 5 years driving performance-focused campaigns, marketing automations, and conversational AI solutions for real-world businesses. Expert in end-to-end digital marketing — SEO, PPC, media buying, landing page optimization, funnel building, email marketing, and campaign analytics — backed by deep technical skills in AI/ML pipelines, voice/SMS flows (Twilio, Retell, Vapi), and CRM integrations (GHL, Make, Zapier, n8n). Proven at reducing operational costs, eliminating lead leakage, and scaling lead generation through data-driven automation and AI-powered customer engagement.

Strong in NLP, LLM fine-tuning, RAG systems, API integration, and AWS infrastructure. Currently completing a BS in Digital Marketing at Arizona State University (W. P.

Carey

School of Business, AACSB-accredited).

Conversational AI and Automation Developer at Upwork (2022-09 – Present)

• Developed custom AI chatbots, voice agents, and automation tools for over 20 global clients across healthcare, education, and customer service industries.
• Built and deployed fine-tuned GPT models for specific business use cases, improving task accuracy by up to 30%.
• Integrated AI voice assistants using Vapi, Twilio, and Retell AI to automate customer support calls, reducing client operational costs.
• Designed and implemented Retrieval-Augmented Generation (RAG) systems to enhance data-driven AI responses.
• Worked with vector and graph databases (Neo4j, Pinecone, Vector DB, Supabase, Weaviate) to optimize semantic search and embedding workflows.

Technical Virtual Assistant at Stellar Staff (2023-09 – 2025-05)

Supported daily operations, analytics, and automations for eCommerce and digital marketing clients.

• Monitored and maintained Zapier and Make workflows; troubleshot failed automation runs and implemented retry queues to ensure seamless operations.
• Developed and maintained modern, minimalistic websites optimized for user experience and conversion.
• Executed Search Engine Optimization strategies to enhance store visibility and organic traffic growth.
• Managed and optimized media buying campaigns across multiple platforms to maximize ROI and customer acquisition.
• Created SOPs and QA sheets for onboarding and escalation procedures, standardizing team workflows and improving response consistency.
• Analyzed and reported business metrics (inventory, ad performance, email marketing) on a regular basis to inform strategic decisions.
• Created and managed newsletters and promotional emails, including key automated email flows.
• Assisted in executive tasks, including scheduling, booking, and coordination.
• Managed outreach and relationships with influencers, including payout processing.
• Handled social media posting, engagement, and community responses.
• Managed inventory and troubleshot customer/vendor issues on Shopify.

Bachelor of Science in Digital Marketing – Arizona State University, W. P. Carey School of Business (AACSB-Accredited) (2024-03)

BSc in Horticulture – Egerton University (2012 – 2015)