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I'm James Patrick Miller, a Senior Software Engineer with 10+ years building production multi-tenant SaaS platforms and full-stack applications across React, TypeScript, Python, Java, and Node.js. I’ve owned the payments and fulfillment stack at Exigo and led architecture and data-layer initiatives that supported SOC 2 Type II audit readiness and scalable AWS deployments. I enjoy mentoring mid-level engineers to take on leadership roles, designing backend microservices, and partnering with product and founders to decide what to ship next. I’ve architected Python-based backends (FastAPI, Django) and Django, built AI-assisted workflows, and advanced CI/CD, security, and data privacy practices across teams on AWS and Kubernetes.…I'm James Patrick Miller, a Senior Software Engineer with 10+ years building production multi-tenant SaaS platforms and full-stack applications across React, TypeScript, Python, Java, and Node.js. I’ve owned the payments and fulfillment stack at Exigo and led architecture and data-layer initiatives that supported SOC 2 Type II audit readiness and scalable AWS deployments. I enjoy mentoring mid-level engineers to take on leadership roles, designing backend microservices, and partnering with product and founders to decide what to ship next. I’ve architected Python-based backends (FastAPI, Django) and Django, built AI-assisted workflows, and advanced CI/CD, security, and data privacy practices across teams on AWS and Kubernetes.

James Patrick Miller

Full Stack Developer, Back-End Developer, Front-End Developer, +4

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I'm James Patrick Miller, a Senior Software Engineer with 10+ years building production multi-tenant SaaS platforms and full-stack applications across React, TypeScript, Python, Java, and Node.js. I’ve owned the payments and fulfillment stack at Exigo and led architecture and data-layer initiatives that supported SOC 2 Type II audit readiness and scalable AWS deployments. I enjoy mentoring mid-level engineers to take on leadership roles, designing backend microservices, and partnering with product and founders to decide what to ship next. I’ve architected Python-based backends (FastAPI, Django) and Django, built AI-assisted workflows, and advanced CI/CD, security, and data privacy practices across teams on AWS and Kubernetes.…I'm James Patrick Miller, a Senior Software Engineer with 10+ years building production multi-tenant SaaS platforms and full-stack applications across React, TypeScript, Python, Java, and Node.js. I’ve owned the payments and fulfillment stack at Exigo and led architecture and data-layer initiatives that supported SOC 2 Type II audit readiness and scalable AWS deployments. I enjoy mentoring mid-level engineers to take on leadership roles, designing backend microservices, and partnering with product and founders to decide what to ship next. I’ve architected Python-based backends (FastAPI, Django) and Django, built AI-assisted workflows, and advanced CI/CD, security, and data privacy practices across teams on AWS and Kubernetes.

Available to hire

I’m James Patrick Miller, a Senior Software Engineer with 10+ years building production multi-tenant SaaS platforms and full-stack applications across React, TypeScript, Python, Java, and Node.js. I’ve owned the payments and fulfillment stack at Exigo and led architecture and data-layer initiatives that supported SOC 2 Type II audit readiness and scalable AWS deployments.

I enjoy mentoring mid-level engineers to take on leadership roles, designing backend microservices, and partnering with product and founders to decide what to ship next. I’ve architected Python-based backends (FastAPI, Django) and Django, built AI-assisted workflows, and advanced CI/CD, security, and data privacy practices across teams on AWS and Kubernetes.

Skills

Experience Level

Expert

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Language

English

Fluent

Work Experience

Senior Software Engineer at Docfluent

September 1, 2023 - Present

Led the AI‑document‑processing platform on AWS, reducing latency from 1.2 seconds to 250 milliseconds by implementing prompt‑budget‑aware caching, model routing, and async concurrency in a Python/FastAPI backend with a React/TypeScript front end serving 5,000+ daily active users. Built live widget and API integrations with Zoho and other systems; architected a multi‑service pipeline with OpenAI/Anthropic LM integrations; delivered production‑grade monitoring using Sentry and Prometheus. Mentored five engineers across two seats toward technical‑lead roles and established CI/CD and automated testing practices.

Senior Software Engineer at Rocket Mortgage

May 1, 2023 - September 1, 2023

Reduced a 30M+ event query latency from 6 seconds to ~100ms by implementing filtered indexes on Postgres, rewriting SQL with optimized query plans, and introducing multi‑layer caching across the regulated mortgage originations platform. Collaborated on OAuth2/OpenID Connect integration and centralized REST/GraphQL endpoints, contributing to reliable production performance and secure access patterns.

Senior Software Engineer at Pickup

November 1, 2019 - March 1, 2023

Scaled a multi‑tenant SaaS to support 5x traffic growth across a React/TypeScript frontend and Node.js/Python microservices on Kubernetes via AWS EKS. Implemented event streaming with Kafka, designed scalable API surfaces (REST/GraphQL), and led architecture decisions to improve reliability and deployment velocity.

Senior Software Engineer at Defi Solutions

August 1, 2016 - November 1, 2019

Led architectural decisions across cross‑functional teams and built CI/CD pipelines, containerized services, and scalable deployment patterns. Improved mortgage origination platform performance, reliability, and security posture through automation, monitoring, and code quality initiatives.

Software Engineer at Exigo

February 1, 2016 - August 1, 2016

Cut end‑point response times by parallelizing external API calls and debuggin g bottlenecks in payment and fulfillment workflows. Modeled schemas and structured audit logs for payments and fulfillment to support reliable cross‑system reconciliation.

Software Engineer at Rocket Mortgage

May 1, 2023 - September 1, 2023

Joined a squad inside the regulated mortgage origination platform; developed backend services on AWS using Python, Ruby on Rails, and Node.js; owned partner integrations with credit bureaus and document processors; audited and refactored the integration layer to be idempotent and resumable to prevent reconciliation issues; improved reliability and onboarding of external systems.