{"id":3087225,"url":"https://alion.io/job/s-i-systems-senior-data-scientist","title":"Senior Data Scientist","company":{"id":3865830,"name":"S.i. Systems","domain":"sisystems.com","url":"https://alion.io/company/sisystems-2","size_band":"1001-5000","is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":"ADP","truth_index":null},"role":"Data Science","role_family":"Data Science","seniority":"senior","employment_type":"contractor","work_mode":"on_site","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":null,"salary_estimate":{"min_usd":69000,"max_usd":123000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":90},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"CrewAI","optional":false},{"name":"Fine-tuning","optional":false},{"name":"Function Calling","optional":false},{"name":"LangChain","optional":false},{"name":"LangGraph","optional":false},{"name":"LLM","optional":false},{"name":"Machine Learning","optional":false},{"name":"Prompt Engineering","optional":false},{"name":"pySpark","optional":false},{"name":"Python","optional":false},{"name":"RAG","optional":false},{"name":"SQL","optional":false},{"name":"Amazon SageMaker","optional":true},{"name":"AWS","optional":true},{"name":"AWS Bedrock","optional":true},{"name":"AWS Glue","optional":true},{"name":"AWS Lambda","optional":true},{"name":"AWS Step Functions","optional":true},{"name":"ETL/ELT","optional":true},{"name":"Spark","optional":true}],"status":"live","first_seen_at":"2026-10-21T10:44:17Z","employer_posted_date":null,"last_verified_at":"2026-10-21T10:44:17Z","board_verified":false,"closed_at":null,"days_open":7,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":7},"description":"Reporting to the Director, Data Science, as a Senior Data Scientist you will focus on supporting Canadian business units in accelerating the growth and application of advanced analytics in driving value. The senior data scientist will leverage practical experience in applying varied data science techniques & offering advice/inputs to help with the design, development and implementation of analytics use cases.\n\nKey Responsibilities:\nData Science and Machine Learning\n· Translate business goals into analytical problems; Identify optimal algorithms, statistical techniques and/or GenAI architecture suitable for the business problem at hand\n· Work in cross-functional teams to develop ML/data science products, including GenAI applications\n· Apply best-in-breed data science techniques including descriptive, predictive, and machine learning methods from design to implementation\n· Focus on feature engineering, model training, model evaluation, and prompt engineering for LLMs\nGenAI & Agentic AI Development\n· Design, develop, and deploy GenAI solutions including AI agents, chatbots, and autonomous systems that solve complex business problems\n· Research and pilot the latest GenAI technologies, RAG (Retrieval-Augmented Generation) techniques, and agentic frameworks (LangChain, LangGraph, CrewAI etc.)\n· Implement AI bots/agents with advanced reasoning capabilities and tool use patterns\n· Work with vector databases and embedding models to build intelligent information retrieval systems\nTechnical Leadership & Collaboration\n· Break down broader data science development milestones into actionable goals, activities, and work plans\n· Create and maintain technical design artifacts describing application functionality, data models, interfaces, and integrations\n· Engage and negotiate with stakeholders, make business recommendations with effective presentations of findings at multiple levels of stakeholders\n· Champion continuous improvement and foster innovation within the analytics communi\nRequired Qualifications:\n· Bachelor's degree in Computer Science, Statistics, Mathematics, or related field, or equivalent experience\n· 5+ years experience in developing and implementing data science techniques\n· Proficient in Python for data science and GenAI application development\n· Experience with writing complex SQL and PySpark queries to extract and integrate data from multiple database sources\n· Proficiency in machine learning including supervised and unsupervised models\n· Demonstrated experience in data transformation, data manipulation, and working with structured vs. unstructured data\n· Strong understanding of APIs, microservices architecture, and cloud-native development\n· Hands-on expertise with GenAI frameworks and LLM APIs with experience developing AI bots/agents with reasoning and tool-use capabilities\n· Strong understanding of RAG techniques, prompt engineering, and fine-tuning methodologies and familiarity with vector databases and embedding models\n· Experience with chatbot development concepts and conversational AI design\n· Exceptional communication skills to articulate complex technical concepts to both technical and non-technical stakeholders\n· Effective and concise oral and written storytelling and insights communication skills\n· Ability to work on multiple projects in parallel while managing constantly changing deadlines and priorities\n· Proven ability to mentor and guide junior data scientists and data engineers\n· Strong problem-solving abilities and analytical skills with keen attention to detail\n\nWhat would be nice to have?\n· Experience with AWS services including SageMaker, Lambda, Bedrock, and other AI/ML services\n· Experience with data warehousing, pipelines, and big data technologies such as AWS Glue for ETL, Glue Catalog, Glue Data Quality, and AWS Step Functions.\nDisclaimer:\nAI may be used in evaluating candidates.\nThis posting is for an existing 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