Hands-On Engineering · Tech Leadership · Applied AI · Platform Scale

Build it right.
Ship it fast.
Scale it further.

Engineering leadership and hands-on development for teams that need both the strategy and the execution.

15+ Years of experience
300+ Enterprise clients on delivered platforms
Fintech · Insuretech · Healthtech · Retail Industries served
AI Tooling Claude · Copilot · Cursor · Codex
Andrew Hahn

I build teams that ship with clarity and hold up at scale.

Stone Arch Technology takes its name from Minneapolis's historic Stone Arch Bridge — built to last, and still standing. Same idea here.

I'm a senior engineering leader who still writes code. I set technical direction, work alongside your team, and actually build things. I've led platform modernizations, grown engineering orgs, and served as interim Head of Engineering — and I still write code.

With AI embedded into how I work, I move faster and cover more ground than a traditional consultant. Based in NYC, working with clients across the country.

Where I've worked

Insuretech Platform

Senior Engineering Manager · Interim Head of Engineering

Led cross-functional teams across the full SDLC. Appointed interim Head of Engineering during a critical leadership transition — maintained delivery momentum and upheld technical standards org-wide

Enterprise Fintech SaaS

Senior Engineering Manager · Sr. Staff Engineer

12 engineers, 300+ enterprise clients. Drove microservices re-architecture on Azure — improved platform reliability ~35%, cut deploy cycle time in half across 10+ major releases over 3 years

Scaled Healthtech Platform

Senior Software Engineer · Independent Contractor

Led a team delivering FHIR APIs exposed to external app developers via OAuth — the company's first public-facing health data integration layer on a HIPAA-compliant platform

Retail & Enterprise Technology

Senior Software Engineer · Independent Contractor

Core systems rewrites, microservices, ETL pipelines, and production CRM delivery across retail, legal tech, and fintech. Kafka, Kubernetes, Java, Spring Boot, Node.js, AWS

What I do

01

Backend Development

Scalable APIs, microservices, and data pipelines. Node.js, Python, Java, TypeScript — built for correctness and operational simplicity at enterprise scale.

02

Frontend Development

Responsive, accessible web interfaces. React SPAs to server-rendered pages — built for performance, maintainability, and real users.

03

API & Integration

Third-party integrations, webhook systems, and enterprise CRM pipelines. Clean contracts, reliable delivery across complex bi-directional data flows.

04

AI Strategy & Enablement

LLM product integration and AI-augmented development. I use these tools daily — I know where they accelerate teams and where they create debt that compounds later.

05

Technical Consulting

Architecture reviews, technology selection, and team enablement. An independent perspective from someone credible in both the codebase and the room where decisions get made.

06

Engineering Leadership

Interim or embedded leadership. Org design, technical strategy, team health, and hiring — player-coach style, with genuine credibility across the codebase and the org chart.