Yussuf Hersi

AI Architect & Senior Software Engineer
Nairobi, Kenya • yussuf@hersi.dev • hersi.dev
GitHub • X (Twitter)

Profile

Senior Software Architect transitioning into AI Engineering (2026 Phase). Expert in building agentic orchestration loops, hybrid retrieval systems (GraphRAG), and production-grade AI platforms. Proven track record of architecting scalable distributed systems and shipping high-impact SaaS products.

Core Expertise

AI Engineering: Agentic Design Patterns, Multi-Agent Orchestration (CrewAI, LangChain), Long-Context Window Management.
Retrieval Architecture: Hybrid GraphRAG (Neo4j + Vector), Semantic Caching, Reranking Pipelines.
Backend Architecture: Distributed Systems, Microservices (Go, Rust, Python), Scalable APIs.
Intelligence Ops: Tracing & Observability for non-deterministic systems, LLM Evaluation Frameworks.

Professional Experience

Founder & AI Lead | ContextBytes

Jan 2025 — Present

Architected a production-grade AI Cognitive Architect for processing long-form media (PDFs, Videos, Articles).
Implemented a hybrid GraphRAG system using Neo4j and Vertex AI, improving retrieval accuracy by 40% compared to vanilla vector search.
Developed autonomous agent loops for automated knowledge synthesis and memory management.

Founder | Pesastream

2024 — 2025

Built a fintech SaaS platform simplifying African payments via Mpesa integrations.
scaled the platform to handle mission-critical financial transactions with 99.9% uptime.

Software Engineer | Mursal Technologies

2023 — 2024

Designed and maintained scalable backend services using Go and PostgreSQL.
Optimized internal developer tools, reducing CI/CD latency by 30%.

Key Projects

Aftahan NLP: A specialized linguistic engine for Somali language processing, enabling deep localization in LLMs.
NextDeploy: A vendor-independent deployment engine for Next.js applications using Go and Docker.

Technical Stack

Languages: Go, Rust, Python, TypeScript.
AI/ML: OpenAI API, Vertex AI, LlamaIndex, LangChain, Neo4j.
Infrastructure: Docker, Kubernetes, PostgreSQL, Redis, AWS/GCP.