About

Expert Software Engineering Consultancy - Helping Technical Leaders Build Better Systems

I'm Nathan T. A. Lewis, a Principal Software Engineer and consultant specializing in complex distributed systems architecture and data infrastructure. With over a decade of experience leading engineering initiatives at scale, I help organizations tackle their most challenging technical problems.

As an independent consultant, I work directly with you to understand your unique challenges and deliver tailored solutions. My approach combines deep technical expertise in event-driven architecture, data platforms, and cloud infrastructure with hands-on implementation experience across modern technology stacks.

Consulting Approach

Architecture-First Thinking

I design systems with scalability and maintainability from the ground up. Whether migrating legacy monoliths to microservices or building new event-driven platforms, I ensure your architecture supports both current needs and future growth.

Data-Driven Decision Making

I build robust data infrastructure that powers real-time analytics and business intelligence. From Apache Kafka event streams to Materialize incremental computation, I ensure your data flows accurately and reliably.

Pragmatic Implementation

I balance cutting-edge technology with practical team capabilities. I leverage modern tools and AI-assisted development while maintaining rigorous quality standards, ensuring solutions are both innovative and maintainable.

Technical Expertise

Architecture & Systems Design

  • ✓ Event-Driven Design
  • ✓ Microservice Design
  • ✓ Domain-Driven Design (DDD)
  • ✓ Event Sourcing
  • ✓ CQRS
  • ✓ UML Diagrams

Data & Analytics

  • ✓ Apache Kafka
  • ✓ Materialize
  • ✓ Apache Flink
  • ✓ BigQuery
  • ✓ Looker
  • ✓ Bitemporal Modeling
  • ✓ Star Schema
  • ✓ Data Lake
  • ✓ Medallion Architecture
  • ✓ Kappa Architecture

Programming & Development

  • ✓ TypeScript
  • ✓ JavaScript (ES6+)
  • ✓ SQL
  • ✓ GraphQL
  • ✓ RESTful APIs
  • ✓ Protobuf
  • ✓ Avro
  • ✓ JSON
  • ✓ Python
  • ✓ React
  • ✓ Ruby on Rails
  • ✓ Node.js
  • ✓ Test-Driven Development

Infrastructure & DevOps

  • ✓ Kubernetes
  • ✓ Helm
  • ✓ Docker
  • ✓ Google Kubernetes Engine (GKE)
  • ✓ Google Cloud Platform (GCP)
  • ✓ ArgoCD

Leadership & Process

  • ✓ Tech Talks
  • ✓ Coding Workshops
  • ✓ Team Leadership
  • ✓ Mentoring
  • ✓ Agile/SAFe Practices

Professional Experience

OfficeSpace Software

Principal Software Engineer

January 2022 - February 2026

(Transitioned to Full-Time Employee Jan 2025; previously Consultant via Source Spectrum)

  • • Designed and led the delivery of a multi-tenant streaming analytics platform that offloaded reporting from a single-tenant monolith, forming the basis of a separately monetized analytics package.
  • • Implemented event-time enrichment to guarantee correctness of historical analytics with full support for delayed and out-of-order data, including bulk CSV uploads months after events occurred.
  • • Replaced Apache Flink with Materialize to preserve event-time correctness while shifting to a more predictable, SQL-based incremental computation model aligned with team and operations capabilities.
  • • Led the migration from a custom Helm-managed Kafka deployment to the Strimzi Kafka Operator, improving cluster reliability, self-healing, scalability, and maintainability.
  • • Extended the streaming analytics platform into a real-time data backbone by projecting authoritative current-state views into service-owned Postgres databases, enabling OLTP use cases on top of existing event streams.

Source Spectrum

Software Engineering Consultant

January 2025 - Present

  • • Providing expert consulting services in software architecture, data infrastructure, and cloud platforms to help organizations solve complex technical challenges.

Bahá'í World Centre

Department Interface

2011 – July 2014

  • • Served as the single point of accountability for IT services delivery to a portfolio of assigned departments.
  • • Engaged in business analysis and solution design to translate complex departmental needs into pragmatic technical projects.
  • • Collaborated with strategy and architecture sections to ensure departmental solutions remained aligned with the broader enterprise roadmap.

Programme Manager

2010 – 2011

  • • Led a cross-functional team of six through a successful Oracle E-Business Suite upgrade (11i to R12).

Application Developer/Analyst

July 2008 – 2010

  • • Developed in-house applications supporting core financial and operational workflows across the organization.

Google

Platforms Summer Intern

June 2007 – August 2007

Goldman Sachs and Co.

Technology Summer Analyst

June 2006 – September 2006

Education

Cooper Union for the Advancement of Science and Art

Master of Engineering & Bachelor of Engineering in Electrical Engineering

May 2008

  • • Master's thesis: Distributed Particle Swarm Optimization with Applications in Feed-Forward Neural Networks

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