Billy Linn — Resume

Senior engineer with 15+ years across full-stack development, backend systems, cloud architecture, IoT, and embedded work. Currently at Alchemer building Python microservices and integrating complex third-party services at scale. Applied AI/LLM experience includes architecting a multi-provider AWS Bedrock proof-of-concept for the Alchemer platform, running self-hosted LLMs via Ollama, and building event-driven workflow APIs at production scale. Known for owning complex work end-to-end, navigating large legacy codebases with authority, making sound architectural calls, and mentoring engineers effectively — without needing to be told what to do next.

Technical Skills

AI / LLMs AWS Bedrock (multi-provider), Ollama (local model hosting), CrewAI (multi-agent orchestration), ChatGPT API, GitHub Copilot; applied LLM integration — not just research

Languages Python, PHP, C/C++ — comfortable picking up new languages quickly (Go, Kotlin, etc.)

Cloud / Infra AWS: Lambda, SQS, DynamoDB, S3, RDS, EC2, SES, IoT Core · Kubernetes · Redis · Memcached

Backend REST API design, event-driven architecture, Laravel, Nginx, PostgreSQL, MySQL, Elasticsearch

Integrations Auth0, Zuora, Stripe, Twilio, Slack, Google APIs, HubSpot, Salesforce, Mailchimp, and many more

Tools PHPStorm, Postman, Jira, Xdebug, PHPUnit, Xdebug, SequelPro, GIMP

Experience

Alchemer — Senior Software Engineer

Mar 2024 – Present

Boulder, CO (Remote)

Architected and built an AWS Bedrock proof-of-concept for integrating multiple LLM providers into the Alchemer survey platform — covering multi-provider routing, prompt design, and LLM-driven analysis patterns.
Building Python microservices deployed on AWS with Kubernetes, providing APIs consumed by frontend SPAs and other internal services.
Leading backend integration of Auth0 (identity/SSO) and Zuora (subscription billing) into a large-scale legacy PHP application — coordinating across teams and managing complex data migration concerns.
Regular contributor to architecture reviews and code reviews; deep familiarity with the Alchemer codebase, data model, and service landscape.

Alchemer (prev. SurveyGizmo) — Senior → Lead Developer

Oct 2016 – Oct 2021

Boulder, CO (Remote)

Started as Senior Developer, was promoted to Lead Developer after 13 months, then returned to Senior after relocating to Wyoming; worked across the platform from bug fixes to major feature delivery with product, support, and DevOps.
Lead architect and developer on the Workflows engine — an event-driven API backend (PHP, DynamoDB, Elasticsearch, SQS, PHPUnit) powering a Vue SPA for survey workflow automation.
Lead architect on a company-wide Zuora billing overhaul — replacing a custom in-house billing system to manage subscriptions, payments, and feature/quota enforcement; coordinated across billing, finance, product, and engineering.
Mentored junior and mid-level engineers through code reviews, pair programming, and architecture sessions; established practices for async remote work that the company later adopted broadly.
Drove incident response: log analysis, root cause investigation, data recovery scripting, and post-mortem process improvements.

City of Fort Collins — Full Stack Developer

Jun 2010 – Oct 2016

Fort Collins, CO

Full stack development, server administration, database design, CMS development, third-party service integration, and UI/UX — serving a wide range of city departments and public-facing applications. Advised on usability, information architecture, and best practices.

Colorado vNet — QA → Software Engineer / Project Lead

Apr 2008 – Jun 2010

Loveland, CO

Web-based control system for whole-house audio and HVAC. Tested in-wall control panels and led the development of a new audio/video server product.

Notable Projects at Alchemer

AWS Bedrock LLM POC — Lead Architect / Developer

Built a proof-of-concept to evaluate integrating multiple LLM providers into the Alchemer survey platform via AWS Bedrock. Explored multi-provider routing, prompt engineering, and LLM-driven survey analysis.

AWS Bedrock Python Multi-provider routing LLM integration

Workflows Engine — Lead Architect / Backend Developer

Designed and built an event-driven API backend for a survey workflow automation product consumed by a Vue SPA. Emphasis on async processing and scalable data access patterns.

PHP DynamoDB Elasticsearch SQS PHPUnit

Auth0 Integration — Backend Developer

PHP & Python microservice layer bridging Auth0 identity management with Alchemer's legacy authentication system.

PHP Python Auth0 Microservices

Billing Overhaul (Zuora) — Lead Architect / Developer

Replaced a custom in-house billing system with Zuora across the entire platform — subscription management, payment processing, and feature/quota enforcement.

Zuora PHP Multi-stakeholder

Twilio SMS Campaigns — Supporting Architect / Developer

Researched, architected, and implemented SMS campaign delivery from within the Alchemer platform.

Twilio PHP

Personal Projects

DoorWiki (since 2016)

Self-built, multi-tenant SaaS PWA for property management. Full AWS stack with Lambda (image processing), S3, RDS/Postgres. Laravel, Nginx, Stripe, Mailgun, Vonage, Google Places. CSV/OCX imports, public listing site, and more.

Laravel AWS Postgres Stripe Multi-tenant SaaS

Laundry Lockers

IoT locker system for 24/7 laundry drop-off/pickup. v1: Python on Raspberry Pi + Slack notifications. v2: C/C++ on ESP32 MCU, MQTT via AWS IoT Core, Lambda event processing. Custom PCB design.

Python C/C++ ESP32 AWS IoT Core Lambda MQTT

Remote Temp/Humidity Sensors

Monitors multiple rental units to prevent frozen pipes. ESP32 + DHT11 sensors push to Firestore every 20 minutes; simple web dashboard for live viewing.

ESP32 Firestore Python

Bingo TV

Raspberry Pi-based bingo caller used at local fundraisers for the retirement home and boys and girls club. Python + PyQt5: full game board display, audible number calls, multiple game modes.

Python PyQt5 Raspberry Pi

Technical Skills

Experience

Notable Projects at Alchemer

Personal Projects

Education