Travis Hairfield

Software Engineering Manager

thairfield.com | 704.467.3976 | travis.hairfield@gmail.com

Oakland, California

Skills

• Eng

  Scaling and reliability, web UIs, cloud architecture, networking, databases, security

• Languages

  Typescript, Python, Go, SQL, Cypher, HTML, CSS

• Libraries

  React, GRPC, GraphQL, TailwindCSS, Pytorch

• Ops

  AWS, Cloudformation, CDK, Docker, Honeycomb

• AI

  Prompt engineering (experience), PEFT (Nvidia training), Transformer Architecture and Deep Learning Fundamentals (Karpathy YouTube series)

Experience

• Built an LLM-powered learning game website, designed in a question-and-answer format
• All content is generated by LLMs, including questions, answers, explanations, and the topics themselves
• Have received ~12,000 answers from ~1,000 users across ~7,000 questions

• Led a cross-disciplinary team of 8 software and IT engineers in the design and delivery of technical infrastructure, serving 20,000+ patients and ~1000 employees
• Holistically owned the provision of compute, networking, and security across all surfaces - cloud, office, clinics, warehouses, remote workforce, and patient portals
• Responsible for building roadmaps, aligning resourcing, and reporting status on a weekly basis to CEO, as well as mentoring engineers, interviewing candidates, and acting as hiring manager
• Implemented a merger and reorganization of the two teams, in order to centralize ownership of overlapping networking, security, and compute management functions
• Extended our footprint into 5G edge computing, by providing runtime, networking, and deployment systems for the new CarePod "clinic-in-a-box" product

• Led a team of 6 software engineers tasked with building foundational services, maintaining production system uptime, and ensuring cloud security
• Achieved the next stage of resiliency, building multi-region redundancy for critical services
• Rolled out trace-aware sampling, saving the company $30k while preserving events critical to debugging

• Provided, managed, and secured cloud infrastructure, as well as building core services that empowered our application and backend engineers
• Led project to upgrade load balancers from network-layer to application-layer, enabling complete internal routing of production packets, as well as more intelligent health checks that created AZ-level resiliency and reduced mean rollback time by ~80%
• Utilizing the new info provided by the upgraded load balancers, built system-wide health dashboard and alerts
• Deployed and managed a continuous deployment system, cutting eng time per deploy by ~90%
• Audited the authorization system, discovering and fixing a highly critical security vulnerability

Opendoor

• Led team that built the external APIs for receiving, validating, and processing leads from partners
• Led throughput and latency optimization efforts using insights gleaned from distributed tracing
• Designed the service that calculated product-customer eligibility
• Ran team standups, retros, and planned offsites

Doxa

• Launched a decentralized application to incentivize the amplification of truthful content
• Built using Ethereum for state computation and IPFS for data storage

23andMe

• Built settings, profile, and onboarding pages
• Developed interactive data visualizations and survey questions
• Led winning team for 2016 hackathon. Built interactive mapping from human body to health reports

Opower

• Forward-deployed engineer tasked with integrating with utility company data systems