ABC Fitness

Principal AI Engineer

ABC Fitness

full-time

Posted on:

Location Type: Remote

Location: Canada

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Job Level

Lead

Tech Stack

AWSCloudFlaskPython

About the role

  • Work cross-functionally with Product/Design to translate ambiguous problems into measurable outcomes and shippable iterations.
  • Lead the estimation of work at the quarterly level.
  • Provide alternative solutions and negotiate with Product Management.
  • Build and ship LLM-powered product capabilities end-to-end: APIs, orchestration logic, integrations, and production rollouts
  • Design and implement agentic workflows (tool use, planners/routers, multi-step reasoning, handoffs, memory/state management) using modern orchestration frameworks (e.g., Lang Chain/Lang Graph-style)
  • Develop strong prompting + context engineering practices, including prompt versioning and experimentation (e.g., A/B testing approaches)
  • Build evaluation harnesses for LLM apps: curated test sets, automated checks, offline/online metrics, human review loops, and regression gates for changes
  • Collaborate with platform/infra teams to deploy on AWS, ensuring reliability, security, scalability, latency, and cost controls
  • Be an active participant in the day-to-day agile activities of the team including sprint planning, daily standups, sprint reviews, and retrospectives
  • Instrument systems for observability (quality, latency, token/cost, errors) and create feedback loops to improve model+system behavior over time
  • Develop high quality solutions; leads the creation of new standards, patterns, and best practices
  • Write architecture & design documentation for new products, systems, and patterns
  • Review the work of teammates to ensure quality and adherence to system architecture and best practices; identify where new designs will require architectural changes
  • Mentor junior developers to grow their skills
  • Troubleshoot and resolve complex and highly escalated customer/QA found issues in a timely manner
  • Experiment with new technologies that can enhance our tech stack. Provide new technology insights to remainder of development team.
  • Lead the implementation of development process improvements that add efficiency for the entire development team
  • Participate in build vs. buy analysis and complex decision making
  • Conduct regular, self-guided study to stay current on new and existing technologies
  • Participate in the hiring process and technical screens with an aim of attracting and hiring the very best engineers; work to expand the onboarding efficacy and vision
  • May represent the team through presentations to other company departments and customers

Requirements

  • Engineering or Comp Science degree or equivalent work experience
  • 9+ years of professional experience in software engineering, applied ML, data science engineering, or AI product engineering
  • Strong Python skills, experience building backend services (e.g. Flask/FastAPI) and integrating with REST APIs
  • Some applied ML / data science experience (e.g., experiments, model evaluation, error analysis, feature work, or shipping ML-informed product changes), even if your recent focus has shifted toward software/AI engineering
  • Practical understanding of LLMs/SLMs and how they behave in production (hallucinations, prompt sensitivity, latency/cost tradeoffs)
  • Hands-on experience building LLM applications (RAG, tool use, agents, workflow orchestration), with the ability to demonstrate end-to-end ownership from prototype‚ production‚ measurement, iteration
  • Experience with cloud infrastructure (e.g. AWS) and shipping production workloads (containers, deployments, monitoring)
  • Strong engineering fundamentals: testing, debugging, performance thinking, and clean, maintainable design
  • Excellent communication skills and ability to collaborate effectively in fast-paced, agile environments
  • Comfortable learning new technologies and system
Benefits
  • Time Off – with our open PTO policy, we offer flexibility in how and when you take PTO!
  • Days of Disconnect – once a quarter, we take a collective breather and enjoy a day off together around the globe. #oneteam
  • Parental & Pawternity Leave – we offer leave for when your family grows by two feet or four paws!
  • Best Life Perk – we are committed to meeting you wherever you are in your fitness journey with a quarterly reimbursement
  • Medical/Dental/Vision coverage
  • EAP – we get you help when you need it. Period.
  • Premium Calm App – enjoy tranquility with a Calm App subscription for you and up to 4 dependents over the age of 16
  • And more! – so many benefits we couldn’t even fit them all here!
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
Pythonbackend servicesFlaskFastAPIREST APIsapplied MLdata science engineeringLLM applicationsworkflow orchestrationcloud infrastructure
Soft Skills
communication skillscollaborationmentoringproblem-solvingnegotiationagile methodologiesleadershipadaptabilitycritical thinkingself-guided learning
Certifications
Engineering degreeComputer Science degree