{"id":4263206,"url":"https://alion.io/job/s-i-systems-senior-full-stack-web-application-developer","title":"Senior Full stack Web Application Developer","company":{"id":3865830,"name":"S.i. Systems","domain":"sisystems.com","url":"https://alion.io/company/sisystems-2","size_band":"201-500","is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":"ADP","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","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":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"AWS","optional":false},{"name":"Node JS","optional":false},{"name":"React.js","optional":false},{"name":"Redux","optional":false},{"name":"TypeScript","optional":false},{"name":"Amazon ECS","optional":true},{"name":"Amazon S3","optional":true},{"name":"AWS Bedrock","optional":true},{"name":"AWS Lambda","optional":true},{"name":"CloudFormation","optional":true},{"name":"IAM","optional":true},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-11-13T04:39:22Z","employer_posted_date":null,"last_verified_at":"2026-11-13T04:39:22Z","board_verified":false,"closed_at":null,"days_open":0,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":0},"description":"Our financial services client is seeking a Senior Full stack Web Application Developer to build and support cloud-native applications using Node.js, TypeScript, and React\n\nBuild cloud-native Software-as-a-Service applications for the Private Equity investment industry within an award-winning global business. The role spans backend development, reusable frontend components, and AWS resource management within a cross-functional Agile team. The opportunity includes personal and professional career development, educational support.\n\nPermanent, Toronto, Working Hours: EST\nHybrid (3 times a week on site)\n\nMust Haves\n6+ years in web application development.\n3+ years developing with Node.js / TypeScript, plus designing and developing asynchronous processes using queues.\n2+ years developing with React / Redux.\nDemonstrated proficiency in debugging, code tuning, code management and branching, coding styles, and refactoring.\nBachelor’s degree in Engineering, Computer Science, or equivalent.\n\nNice to Have\nAWS services: Lambda, S3, ECS, CloudFormation, and IAM.\nAmazon Bedrock and LLMs.\nFinancial services industry experience, particularly Real Assets or Property Management.\n\nResponsibilities\nDevelop backend code using Node.js and TypeScript.\nDevelop reusable React components and new application pages.\nCoach junior team members.\nReview the team’s work for quality.\nCreate unit tests that maintain test coverage thresholds.\nContribute to team activities and Agile ceremonies.\nManage AWS resources safely and cost-effectively.\n\nSalary range: CAD $120,000 - CAD $150,000\nDisclaimer:\nAI may be used in evaluating candidates.\nThis posting is for an existing vacancy.","description_format":"text","description_chars":1668,"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":["Equity"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-11-13T16:09:26Z"}],"visa":[],"liveness":{"score":52,"band":"ok","label":"Likely open","p_open":1,"p_active":0.516,"p_room":1,"age_days":0,"expected_fill_days":24,"reasons":["seen:0","agency","win:early","comp:brand"],"computed_at":"2026-11-13T18:30:34Z"},"pay":null,"html_url":"https://alion.io/job/s-i-systems-senior-full-stack-web-application-developer","json_url":"https://alion.io/job/s-i-systems-senior-full-stack-web-application-developer.json","meta":{"generated_at":"2026-11-13T18:30:34Z","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":37008,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-14T00:00:00Z"}},"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":3865830},"rest":"https://alion.io/mcp/rest/get_company?id=3865830"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fs-i-systems-senior-full-stack-web-application-developer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"free","price":{"credits":0,"usd":0},"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%2Fs-i-systems-senior-full-stack-web-application-developer"},{"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%2Fs-i-systems-senior-full-stack-web-application-developer"},{"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/s-i-systems-senior-full-stack-web-application-developer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fs-i-systems-senior-full-stack-web-application-developer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":4263206}},{"tool":"search_jobs","arguments":{"company":"sisystems.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":4263206},"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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