Senior Backend / AI Systems Engineer

Spellbook
Canada
Workplace: RemoteFull timeCAD 140,000 - 210,000 annuallyFunction: IT Operations (Systems/Network Admin)Skills: ["Communication","Problem-solving","Self-starter","Teamwork"]

Build backend systems that power Spellbook’s product experiences, combining traditional services with AI-driven workflows. Own low-latency, high-reliability AI search, inference, and orchestration layers, and operate RAG retrieval at scale with correct permissions isolation. Handle platform concerns like rate limiting, retries, and safe degradation, partner with Product and Design on latency/accuracy tradeoffs, and participate in on-call to improve feature reliability.

Loading

Loading job details...

Preparing the role view and application actions.

FursaFursa
Spellbook
Spellbook
3 months ago

Senior Backend / AI Systems Engineer

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 13 hours agoStatus: Live

Job Summary

Build backend systems that power Spellbook’s product experiences, combining traditional services with AI-driven workflows. Own low-latency, high-reliability AI search, inference, and orchestration layers, and operate RAG retrieval at scale with correct permissions isolation. Handle platform concerns like rate limiting, retries, and safe degradation, partner with Product and Design on latency/accuracy tradeoffs, and participate in on-call to improve feature reliability.
Location: Canada
Workplace: Remote
Employment Type: Full time
Job Function: IT Operations (Systems/Network Admin)
Seniority: Mid level

Key Responsibilities

  • •Build and scale backend systems supporting Spellbook core product functionality (Reviews, Chat, Library, and more).
  • •Design low-latency, high-reliability search, inference, and orchestration layers for AI features.
  • •Build and operate RAG retrieval at scale with production-grade performance optimization and permissions-correct data isolation.
  • •Own core AI platform concerns including rate limiting, retries, consistency, fallbacks, and safe degradation.
  • •Partner with Product and Design to balance latency, accuracy, UX, and reliability; participate in on-call and incident response as needed.

Pay and Benefits

Salary: CAD 140,000 - 210,000 annually
Equity and Bonus:Equity
Perks:EquityMeal AllowanceWellness StipendParental LeaveHealth Insurance

Key Requirements

  • •5+ years building backend systems in production.
  • •Strong fundamentals in backend engineering and distributed systems (APIs, data modeling, concurrency, queues, AI inference).
  • •Strong NoSQL data modeling and performance tuning (MongoDB ideally, schema design/denormalization, indexing, query optimization, production profiling).
  • •Ability to take an ambiguous, high-impact problem and deliver a clear plan and shipped outcome.
  • •Strong communication skills to explain technical decisions to engineers and non-engineers.
Skills:CommunicationProblem-solvingSelf-starterTeamwork
Tech Stack:Node.jsTypeScriptExpressTRPCMongoDBDockerAWSCDKOpenAIAnthropicLLMRAG

Company Brief

Spellbook
Provides an AI-powered contract drafting and review platform for legal professionals, automating contract clause generation, analysis, and risk spotting to accelerate document creation and improve consistency across transactional workflows.
Industry: LegalTech
Website