{"id":3958029,"url":"https://alion.io/job/hays-backend-engineer","title":"Backend Engineer","company":{"id":1050165,"name":"Hays","domain":"hays.ca","url":"https://alion.io/company/hays-ca","size_band":"5000+","is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":null,"employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Toronto, Canada"],"countries":["CA"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":90,"max":100,"currency":"CAD","period":"hour","gross":null,"usd_annual":142000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"Docker","optional":false},{"name":"FastAPI","optional":false},{"name":"Function Calling","optional":false},{"name":"GCP","optional":false},{"name":"Google BigQuery","optional":false},{"name":"LangGraph","optional":false},{"name":"LLM","optional":false},{"name":"Python","optional":false},{"name":"RAG","optional":false},{"name":"Redis","optional":false},{"name":"Rest API","optional":false},{"name":"Structured Outputs","optional":false},{"name":"Google Cloud Run","optional":true},{"name":"Google GKE","optional":true},{"name":"Kubernetes","optional":true},{"name":"LangChain","optional":true},{"name":"Langfuse","optional":true},{"name":"Machine Learning","optional":true},{"name":"Semantic Search","optional":true}],"status":"live","first_seen_at":"2026-11-08T00:00:00Z","employer_posted_date":null,"last_verified_at":"2026-11-08T00:00:00Z","board_verified":false,"closed_at":null,"days_open":1,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":1},"description":"Senior AI Backend Engineer (Python/FastAPI, Agentic AI & LLM Applications)Job Type: Contract \nContract Duration: 6 Months \nPay Rate: CAD $90-100/hour (depending on experience and alignment) \nLocation: Hybrid, 1 day onsite weekly, Downtown Toronto, ON\nYour New CompanyOur client is investing in next-generation AI-powered applications and is expanding its engineering team with experienced contractors who can help design, build, and scale production-grade AI solutions. This is an opportunity to work on innovative Agentic AI initiatives involving Large Language Models (LLMs), cloud-native architectures, API integrations, and modern AI orchestration frameworks.\nYour New RoleAs a Senior AI Backend Engineer, you will be responsible for designing, developing, and deploying production-grade AI applications and backend services. You will build scalable Agentic AI workflows, integrate Large Language Models, and contribute to cloud-native solutions that support enterprise-scale applications.Working closely with engineering leadership and technical teams, you will help architect intelligent systems leveraging modern AI frameworks, retrieval systems, cloud services, and observability tooling.\nKey ResponsibilitiesDesign and develop scalable backend services and APIs using Python and FastAPI\nBuild production-grade AI applications leveraging Large Language Models (LLMs)\nDesign and implement Agentic AI workflows and autonomous agent systems\nDevelop and maintain Retrieval-Augmented Generation (RAG) solutions\nIntegrate external and internal services through REST APIs\nImplement LLM tool calling, structured outputs, and workflow orchestration\nBuild and optimize cloud-native applications utilizing GCP, AWS, or Azure\nDevelop integrations with BigQuery, databases, vector stores, and enterprise systems\nContainerize and deploy applications using Docker and modern CI/CD pipelines\nImplement authentication and authorization workflows for secure services\nCollaborate with architects, product teams, and developers on technical design and solution architecture\nMaintain performance, scalability, observability, and reliability of production systems\nParticipate in code reviews, architecture discussions, and technical leadership activities\n\nWhat You'll Need to SucceedRequired Qualifications10+ years of software engineering experience\nStrong Python development experience building production-grade applications\nHands-on experience developing backend services using FastAPI\nExperience building and deploying scalable REST APIs\nExperience building AI-powered applications utilizing LLMs\nExperience developing Agentic AI workflows and autonomous AI systems\nHands-on experience with LangGraph and LangChain\nExperience implementing Retrieval-Augmented Generation (RAG) architectures\nExperience integrating AI services through REST APIs\nExperience with LLM tool calling and structured outputs\nStrong experience designing cloud-native applications\nExperience with Google Cloud Platform (GCP), AWS, or Azure\nExperience integrating applications with databases and data platforms including BigQuery\nFamiliarity with Redis caching strategies\nExperience with authentication and authorization workflows (OAuth, JWT, SSO, etc.)\nExperience with Docker and CI/CD pipelines\nStrong understanding of software design principles, scalability, performance optimization, and secure coding practices\n\nPreferred QualificationsExperience with Langfuse or similar AI observability platforms\nExperience with vector databases and semantic search architectures\nExperience developing multi-agent systems\nExperience deploying applications on GCP using services such as BigQuery, Cloud Run, GKE, Dataflow, or Cloud Storage\nUnderstanding of machine learning and data science fundamentals\nExperience supporting enterprise-scale AI applications in production environments\n\nWhat You'll Get in ReturnYou will join a highly skilled engineering team working on innovative AI initiatives and modern cloud-native solutions. This engagement offers the opportunity to work with cutting-edge technologies including Large Language Models, Agentic AI architectures, LangGraph, LangChain, and GCP while contributing directly to the development of enterprise-scale intelligent systems.Compensation is competitive and commensurate with experience, with flexibility for exceptional candidates who demonstrate strong alignment with the technical requirements.\nWhat You Need to Do NowIf you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or contact us directly for a confidential discussion regarding this opportunity.If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion on your career.\nThis posting is for an existing vacancy with the organization.AI may be used to screen, assess, or select applicants for the position.\n\n This posting is for an existing vacancy with the organization. \n AI may be used to screen, assess or select applicants for the position. \n\n#LI-DNI\n #1127484 - Champa Bhojwani","description_format":"text","description_chars":5062,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-11-09T09:52:04Z"}],"visa":[],"liveness":{"score":52,"band":"ok","label":"Likely open","p_open":1,"p_active":0.516,"p_room":1,"age_days":1,"expected_fill_days":21,"reasons":["seen:1","agency","win:early"],"computed_at":"2026-11-09T13:53:48Z"},"pay":{"stated_usd_annual":142000,"is_top_pay":false},"html_url":"https://alion.io/job/hays-backend-engineer","json_url":"https://alion.io/job/hays-backend-engineer.json","meta":{"generated_at":"2026-11-09T13:53:48Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":18586,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-10T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":1050165},"rest":"https://alion.io/mcp/rest/get_company?id=1050165"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fhays-backend-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fhays-backend-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fhays-backend-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/hays-backend-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fhays-backend-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3958029}},{"tool":"search_jobs","arguments":{"company":"hays.ca","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3958029},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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