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Timothy Markfeld

@timothymarkfeld

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Senior software engineer building distributed backend services, AI automation, and client-facing UI.

United States

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What I'm looking for

I’m looking to build production-grade, fault-tolerant backend systems and AI-powered automation. I want a team that values observability, clean architecture, and mentoring—where distributed systems work directly impacts real customers.

I’m a Senior Software Engineer focused on distributed systems, backend platforms, and AI-powered automation. I build and operate fault-tolerant, event-based worker systems on AWS, owning retry logic and observability for high-throughput content and publishing workflows.

I design secure GraphQL APIs and TypeScript frontends, optimizing database access for multi-tenant workloads, and I lead large-scale refactors to improve long-term maintainability—introducing CQRS patterns and cleaning up legacy architecture. I also engineer end-to-end AI-driven content pipelines, integrating LLMs, fact-checking, media generation, and automated WordPress publishing.

Previously, I worked on a healthcare integration platform running 200+ HIPAA-regulated .NET microservices processing over 1M daily events. I integrated with EHR systems using FHIR APIs and HL7 messaging, led migrations to Apache NiFi with infrastructure provisioning, and supported production reliability with monitoring, alerting, and automated failover—while mentoring engineers on platform architecture.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

FirmPilot

Apr 2025 - Present (1 year 3 months)

Built and owned fault-tolerant event-based worker systems on AWS (SQS/SNS, ECS, RDS) with retry logic and observability supporting content, social media, and backlink automation workflows. Engineered secure GraphQL APIs and React/Next.js TypeScript frontends and led AI-driven content pipelines integrating LLMs and automated WordPress publishing.

SQS Amazon ECS Amazon RDS AWS Parameter Store GraphQL TypeScript React Next.js CQRS LLM WordPress Observability Event Driven Systems

Data Integration Engineer → Data Integration Engineer II

HCA Healthcare

Sep 2023 - Apr 2025 (1 year 7 months)

Managed a healthcare integration platform of 200+ HIPAA-regulated .NET microservices processing 1M daily events. Integrated with external EHR systems using FHIR APIs, HL7 messaging, and IHE interoperability, and led a migration of legacy services to Apache NiFi with Terraform and Google Cloud while implementing Dynatrace monitoring and automated failover workflows.